工业设计毕业论文英汉

工业设计 Industrial Design designIndustrial design is an applied art whereby the aesthetics and usability of products may be improved for marketability and production. The role of an Industrial Designer is to create and execute design solutions towards problems of engineering, usability, marketing, brand development and of industrial designGeneralIndustrial Designers are a cross between a mechanical engineer and an artist. They study both function and form, and the connection between product and the user. They do not design the gears or motors that make machines move, or the circuits that control the movement. And usually, they partner with engineers and marketers, to identify and fulfill needs, wants and Depth"Industrial Design (ID) is the professional service of creating and developing concepts and specifications that optimize the function, value and appearance of products and systems for the mutual benefit of both user and manufacturer." According to the IDSA (Industrial Design Society of America)Design, itself, is often difficult to define to non-designers because the meaning accepted by the design community is not one made of words. Instead, the definition is created as a result of acquiring a critical framework for the analysis and creation of artifacts. One of the many accepted (but intentionally unspecific) definitions of design originates from Carnegie Mellon's School of Design, "Design is the process of taking something from its existing state and moving it to a preferred state". This applies to new artifacts, whose existing state is undefined and previously created artifacts, whose state stands to be to the (Chartered Society of Designers) design is a force that delivers innovation that in turn has exploited creativity. Their design framework known as the Design Genetic Matrix (TM) determines a set of competences in 4 key genes that are identified to define the make up of designers and communicate to a wide audience what they do. Within these genes the designer demonstrates the core competences of a designer and specific competences determine the designer as an 'industrial designer'. This is normally within the context of delivering innovation in the form of a three dimensional product that is produced in quantity. However the definition also extends to products that have been produced using an industrial process. Industrial design is rapidly becoming an obsolete term as 'products' can now be industrially produced as 'one-offs' by the use of Rapid Prototyping Machines. In a post-industrial era and with the emergence of strategic design definitions such as this are incumbering designers and the advancement of design to the ICSID, (International Council of Societies of Industrial Design) "Design is a creative activity whose aim is to establish the multi-faceted qualities of objects, processes, services and their systems in whole life-cycles. Therefore, design is the central factor of innovative humanization of technologies and the crucial factor of cultural and economic of designAlthough the process of design may be considered 'creative', many analytical processes also take place. In fact, many industrial designers often use various design methodologies in their creative process. Some of the processes that are commonly used are user research, sketching, comparative product research, model making, prototyping and testing. These processes can be chronological, or as best defined by the designers and/or other team members. Industrial Designers often utilize 3D software, Computer-aided industrial design and CAD programs to move from concept to production. Product characteristics specified by the industrial designer may include the overall form of the object, the location of details with respect to one another, colors, texture, sounds, and aspects concerning the use of the product ergonomics. Additionally the industrial designer may specify aspects concerning the production process, choice of materials and the way the product is presented to the consumer at the point of sale. The use of industrial designers in a product development process may lead to added values by improved usability, lowered production costs and more appealing products. However, some classic industrial designs are considered as much works of art as works of engineering: the iPod, Coke bottle, and VW Beetle are frequently-cited design has no focus on technical concepts, products and processes. In addition to considering aesthetics, usability, and ergonomics, it can also encompass the engineering of objects, usefulness as well as usability, market placement, and other concerns such as seduction, psychology, desire, and the sexual or affectionate attachment of the user to the object. These values and accompanying aspects on which industrial design is based can vary, both between different schools of thought and among practicing design and industrial design can overlap into the fields of user interface design, information design and interaction design. Various schools of industrial design and/or product design may specialize in one of these aspects, ranging from pure art colleges (product styling) to mixed programs of engineering and design, to related disciplines like exhibit design and interior used to describe a technically competent product designer or industrial designer is the term Industrial Design Engineer. The Cyclone vacuum cleaner inventor James Dyson for example could be considered to be in this category (see his autobiography Against The Odds, Pub Thomson 2002).Industrial design rightsIndustrial design rights are intellectual property rights that make exclusive the visual design of objects that are not purely utilitarian. An industrial design consists of the creation of a shape, configuration or composition of pattern or color, or combination of pattern and color in three dimensional form containing aesthetic value. An industrial design can be a two- or three-dimensional pattern used to produce a product, industrial commodity or handicraft. Under the Hague Agreement Concerning the International Deposit of Industrial Designs, a WIPO-administered treaty, a procedure for an international registration exists. An applicant can file for a single international deposit with WIPO or with the national office in a country party to the treaty. The design will then be protected in as many member countries of the treaty as desired.

你好， foreknown下文从工业设计属性出发，讲到发展进程，立法权益保护还有产品设计的相关内容，字数有限，希望能多给你参考，期望能帮得上你。Industrial design is an applied art whereby the aesthetics and usability of mass-produced products may be improved for marketability and production. The role of an Industrial Designer is to create and execute design solutions towards problems of form, usability, user ergonomics, engineering, marketing, brand development and term "industrial design" is often attributed to the designer Joseph Claude Sinel in 1919 (although he himself denied it in later interviews) but the discipline predates that by at least a decade. Its origins lay in the industrialization of consumer products. For instance the Deutscher Werkbund, founded in 1907 and a precursor to the Bauhaus, was a state-sponsored effort to integrate traditional crafts and industrial mass-production techniques, to put Germany on a competitive footing with England and the United of industrial design Water kettle designed by Peter Behrens in 1909 A Braun stereo Vox Phantom guitar, 1962General Industrial Designers are a cross between an engineer and an artist. They study both function and form, and the connection between product and the user. They do not design the gears or motors that make machines move, or the circuits that control the movement, but they can affect technical aspects through usability design and form relationships. And usually, they partner with engineers and marketers, to identify and fulfill needs, wants and Depth "Industrial Design (ID) is the professional service of creating and developing concepts and specifications that optimize the function, value and appearance of products and systems for the mutual benefit of both user and manufacturer" according to the IDSA (Industrial Designers Society of America).Design, itself, is often difficult to define to non-designers because the meaning accepted by the design community is not one made of words. Instead, the definition is created as a result of acquiring a critical framework for the analysis and creation of artifacts. One of the many accepted (but intentionally unspecific) definitions of design originates from Carnegie Mellon's School of Design, "Design is the process of taking something from its existing state and moving it to a preferred state." This applies to new artifacts, whose existing state is undefined and previously created artifacts, whose state stands to be to the (Chartered Society of Designers) design is a force that delivers innovation that in turn has exploited creativity. Their design framework known as the Design Genetic Matrix (TM) determines a set of competences in 4 key genes that are identified to define the make up of designers and communicate to a wide audience what they do. Within these genes the designer demonstrates the core competences of a designer and specific competences determine the designer as an 'industrial designer'. This is normally within the context of delivering innovation in the form of a three dimensional product that is produced in quantity. However the definition also extends to products that have been produced using an industrial to the ICSID, (International Council of Societies of Industrial Design) "Design is a creative activity whose aim is to establish the multi-faceted qualities of objects, processes, services and their systems in whole life-cycles. Therefore, design is the central factor of innovative humanization of technologies and the crucial factor of cultural and economic exchange."Process of designAlthough the process of design may be considered 'creative', many analytical processes also take place. In fact, many industrial designers often use various design methodologies in their creative process. Some of the processes that are commonly used are user research, sketching, comparative product research, model making, prototyping and testing. These processes can be chronological, or as best defined by the designers and/or other team members. Industrial Designers often utilize 3D software, Computer-aided industrial design and CAD programs to move from concept to production. Product characteristics specified by the industrial designer may include the overall form of the object, the location of details with respect to one another, colors, texture, sounds, and aspects concerning the use of the product ergonomics. Additionally the industrial designer may specify aspects concerning the production process, choice of materials and the way the product is presented to the consumer at the point of sale. The use of industrial designers in a product development process may lead to added values by improved usability, lowered production costs and more appealing products. However, some classic industrial designs are considered as much works of art as works of engineering: the iPod, the Jeep, the Fender Stratocaster, the Coke bottle, and the VW Beetle are frequently-cited design also has a focus on technical concepts, products and processes. In addition to considering aesthetics, usability, and ergonomics, it can also encompass the engineering of objects, usefulness as well as usability, market placement, and other concerns such as seduction, psychology, desire, and the emotional attachment of the user to the object. These values and accompanying aspects on which industrial design is based can vary, both between different schools of thought and among practicing design and industrial design can overlap into the fields of user interface design, information design and interaction design. Various schools of industrial design and/or product design may specialize in one of these aspects, ranging from pure art colleges (product styling) to mixed programs of engineering and design, to related disciplines like exhibit design and interior design, to schools where aesthetic design is almost completely subordinated to concerns of function and ergonomics of use (the so-called functionalist school）。Industrial design rightsIndustrial design rights are intellectual property rights that protect the visual design of objects that are not purely utilitarian. An industrial design consists of the creation of a shape, configuration or composition of pattern or color, or combination of pattern and color in three dimensional form containing aesthetic value. An industrial design can be a two- or three-dimensional pattern used to produce a product, industrial commodity or the Hague Agreement Concerning the International Deposit of Industrial Designs, a WIPO-administered treaty, a procedure for an international registration exists. An applicant can file for a single international deposit with WIPO or with the national office in a country party to the treaty. The design will then be protected in as many member countries of the treaty as desired. Design rights started in the United Kingdom in 1787 with the Designing and Printing of Linen Act and have expanded from 's Design Act, 2000 was enacted to consolidate and amend the law relating to protection of design and to comply with the articles 25 and 26 of TRIPS agreement. The new act, (earlier Patent and Design Act, 1911 was repealed by this act) now defines "design" to mean only the features of shape, configuration, pattern, ornament, or composition of lines or colours applied to any articlewhether in two or three dimensional, or in both forms, by any industrial process or means, whether manualal or mechanical or chemical, separate or combimed, which in the finished article appeal to and are judged solely bt the eye; but does not include any mode or principle of 's industrial design act affords ten years of protection to industrial designs that are registered; there is no protection if the design is not registered. The Industrial Design Act (., c. I-8) defines "design" or "industrial design" to mean features of shape, configuration, pattern or ornament and any combination of those features that, in a finished article, appeal to and are judged solely by the the existence of an exclusive right, no person can "make, import for the purpose of trade or business, or sell, rent, or offer or expose for sale or rent, any article in respect of which the design is registered." The rule also applies to kits and substantial differences are in reference to previously published KingdomIn addition to the design protection available under Community designs, UK law provides its own national registered design right and an unregistered design right. The unregistered right, which exists automatically if the requirements are met can last for up to 15 years. The registered design right can last up to 25 years subject to the payment of maintenance fees。United . design patents last fourteen years from the date of grant and cover the ornamental aspects of utilitarian objects. Objects that lack a use beyond that conferred by their appearance or the information they convey, may be covered by copyright -- a form of intellectual property of much longer duration that exists as soon as a qualifying work is created. In some circumstances, rights may also be acquired in trade dress, but trade dress protection is akin to trademark rights and requires that the design have source significance or "secondary meaning." It is useful only to prevent source misrepresentations; trade dress protection cannot be used to prevent others from competing on the designProduct design can be defined as the idea generation, concept development, testing and manufacturing or implementation of a physical object or service. Product Designers conceptualize and evaluate ideas, making them tangible through products in a more systematic approach. The role of a product designer encompasses many characteristics of the marketing manager, product manager, industrial designer and design term is sometimes confused with industrial design, which defines the field of a broader spectrum of design activities, such as service design, systems design, interaction design as well as product design.[citation needed] The role of the product designer combines art, science and technology to create tangible three-dimensional goods. This evolving role has been facilitated by digital tools that allow designers to communicate, visualize and analyze ideas in a way that would have taken greater manpower in the neededProduct designers are equipped with the skills needed to bring products from conception to market. They should have the ability to manage design projects, and subcontract areas to other sectors of the design industry. Aesthetics is considered important in Product Design but designers also deal with important aspects including technology, ergonomics, usability, stress analysis and materials with most of the design fields the idea for the design of a product arises from a need and has a use. It follows a certain method and can sometimes be attributed to more complex factors such as association and telesis. Also used to describe a technically competent product designer or industrial designer is the term Industrial Design Engineer. The Cyclone vacuum cleaner inventor James Dyson for example could be considered to be in this category (see his autobiography Against The Odds, Pub Thomson 2002).ApplicationSome companies or individuals have particularly strong feel for developing new products than others. In the modern world these include especially technological companies like iRobot, Google or Nokia. Many product designers are strategic assets to companies that need to maintain a competitive edge in innovation.

论文整体框架基本上就是你设计改良的过程，围绕你的设计展开，就可以了。前言摘要关键词：英文摘要第1章 概述 选题目的意义，设计的思路框架；（1-2页即可）第2章 电冰箱的设计分析（重点） 1.设计综述 2.产品分析：优缺点，产品工作原理等 3.消费者分析 4.市场分析 5技术分析等等第3章 电冰箱设计定位（重点） 1.综合分析 2.提出改良方向，功能造型等第4章设计方案的展开 1.概念草图 2.设计展示效果图 3.模型第5章结束语 设计体会心的；方向新的趋势见解等等 （1-2页即可）以上仅是一个基本框架，你可以根据你的认识来进行修改，基本思路应该是这样的，把你的设计从最开始的分析到最后的表现都一一展示出来，应该就OK了

第17 卷第4 期 皮 革 科 学 与 工 程 Vol117 ,No142007 年8 月L EATHER SCIENCE AND ENGINEERING Aug1 2007Artical ID :1004 - 7964 (2007) 04 - 0003 - 06Received Date :20072052213 P. Mokrejs :Corresponding author. Phone N°: + 420 57 603 1230 ;Fax N°: + 420 57 603 1563 ;e2mail :mokrejs @f t . utb. c2Recycling Technology for Waste Tanning LiquorsP. Mok rejs1 3, D. J anacova2 ,M. Mladek1 , K. Kolomaz nik2 , F. L angmaier1 ,V . V asek2(1. Tomas B ata University , Faculty of Technology , Department of Protein and Leather , 275 , 762 72 Zlin, The Czech Republic ;2. Tomas B ata University , Faculty ofA p plied Inf ormatics , Institute of Processing Cont rol and A p plied Computer Science ,N ad S t ranemi 4511 , 760 05 Zlin, The Czech Republic)Abstract :Tannery belongs to typical indust rial branches which during t he technological processp roduce considerable quantities of liquid and solid wastes cont ributing to polluting t he environ2ment . The presented work describes dechromation of waste tanning liquor utilising chrome sludgep roduced t hrough enzymatic hydrolysis of chrome2tanned leat her wastes. The principle of dechro2mation consist s in sorption of chrome f rom waste liquor af ter tanning to chrome sludge. Recy2cling technology is characterised by an almost 99 % efficiency , simplicity and low investment re2quirement words :solid waste ;liquid waste ;chrome sludge ;waste tanning liquor ;chrome recoveryCLC number :X 794 Document code :A鞣制废液的循环技术摘 要:制革属于典型的工业分支,制革工业中会产生大量的污染环境的废液和废固。该论文利用铬鞣革废物的酶法水解用铬污泥除去鞣制废液中的铬。除去铬的原理是鞣后的铬污泥从废液中吸收铬。该循环技术回收率可达99 % ,操作简单、成本低廉。关键词:固体废弃物;液体废弃物;铬污泥;鞣制废液;铬回收1 INTRODUCTIONThe tanning indust ry p rocesses wastes of themeat indust ry , raw hides , and t ransforms t hemt hrough chemical , chemico2p hysical and mechani2cal processes into leather s. During t he technologi2cal process , solid and liquid wastes arise which ,particularly as a consequence of t he cont rover sialchrome t hey contain , burden the environment .Processing one met ric ton of raw hide produces ap2prox. 200 kg finished leat her . About 30 , 000 kgwastewaters arise through processing and moret han 70 % chrome passes into liquid and solidwastes [1 ] .In classic tanning , approx. 40 % chrome (t hestarting charge of 15 - 17 kg Cr / t ) remains inleat her , 26 % - 30 % chrome passes into solidwastes and 30 % - 34 % chrome remains in liquidwastes. In t he tanning of hides using technologicalprocedures ensuring high removal of chrome com2pounds by white hide , 54 % - 57 % chrome remains© 1994-2008 China Academic Journal Electronic Publishing House. All rights reserved. leat her , 31 % - 38 % chrome passes into solidwastes and 5 % - 15 % remains in liquid wastes [2 ] .For modifying t he tanning process , organic acids ,e. g. are used , which cont ribute to improving theremoval of chrome . 1 Liquid wasteManufacture of chrome2tanned leat hers pro2duces 115 - 2 times quantities of wastewater s t hanmanufact ure of vegetable2tanned leat her s [3 ] . Los2ses of chrome compounds in waste tanning liquor smay be prevented in several ways. The simplestapproach is the direct recycling method consistingin re2using exhausted liquor in t he tanning main shortcoming of t his method is a negativeeffect of salt s and other contaminating substanceson quality of finished leather . Af ter being recycledseveral times , wastewater has to be discharged intosewage [4 ] . Anot her potential met hod is indirectrecycling , in which chrome is obtained f rom ex2hausted sludge t hrough precipitation using a suit2able alkaline agent , e. g. sodium hydroxide , sodi2um carbonate , sodium hydrogen carbonate , mag2nesium oxide , calcium sulp hate , calcium hydroxide[5 ] . A f urt her met hod consist s in employing elabo2rate techniques , e. g. elect ro2dialysis , membraneseparation , ion exchangers , wit h which chromemay be separated f rom ot her salt s contained in ex2hausted sludge. Chrome thus obtained is character2ised by much higher p urity than that obtainedt hrough indirect recycling. Disadvantages are ahigh cost and limited po ssibilities of applying t hesedemanding technologies in tanning factories [ 4 ] .Unutilised chrome in liquid wastes , apartf rom significant economic losses for tanneries , al soposes great hazard for t he environment and forman. The most stable and most important oxida2tion state is Cr ( III) . Compounds of Cr (VI) occurin t he form of chromates and dichromates and ex2hibit quite st rong oxidative properties [6 ] .Chrome is found in liquid tanning wastes in it st rivalent form , there exist s , however , potentialdanger of it s oxidising to hexavalent compounds ,particularly when t reating groundwater s to drink2ing waters. Hexavalent compounds , when com2bined wit h calcium or magnesium ions , are st rong2ly carcinogenic[7 , 8 ] .An extensive research exploring negativeeffect s of tanning wastewaters f rom local tannerieson t he adjacent ecosystem was conducted in Indi2a[9 ] . Highest level s of chrome contained in soilwere found in t he vicinity of tanneries , at g/ kg. Highest chrome accumulation was ob2served in cauliflower stalks (72 mg/ kg) in locali2ties near tanneries. In st udies investigating Cr ac2cumulation in fish organs it was found t hat mostchrome accumulates in t he liver (approx. 22 mg/kg) and least in muscles (approx. 1 mg/ kg) . Thepo ssible t ransfer of hazardous Cr doses into t hefood chain and consequently to human beings ist hus quite Sol id wasteTannery processing al so produces a considera2ble quantity of solid chrome2tanned wastes whichpresent a significant problem due to t heir chromecontent . The problem of solid wastes has beensolved so far by land filling which , of course , be2side ever increasing land filling co st s al so bringst he danger of chrome escaping into t he to t heir containing a sizeable proportion ofprotein material , solid tanned wastes started to beprocessed. Enzymatic hydrolysis has being em2ployed to considerable extent in latest year s , wit hit s particular advantages being mild reaction condi2tions and economic cost2effectiveness [10 , 11 ] . Themain product of enzymatic hydrolysis is collagenhydrolysate , whose application possibilities arebroad , e. g. as feed additive , nit rogenous fertili2ser , raw material for preparing adhesives , corro2sion inhibitor s , etc. The remaining waste productaf ter enzymatic hydrolysis (chrome sludge) has notyet found lucrative application. It s employment ,due to chrome content , has not been much adoptedfor preparing combined tanning bat of the presented work is potential use4 皮革科学与工程 第17 卷© 1994-2008 China Academic Journal Electronic Publishing House. All rights reserved. t he waste product af ter enzymatic hydrolysis ofchrome2tanned solid wastes (chrome sludge) for i2solating chrome compounds f rom waste tanningliquor MATERIALS AND METHODSSolid was determined according to ISO 4684[12 ] , ash according to ISO 4047 : 1998[13 ] , nit rogenaccording to ISO 5397 : 1984 [14 ] , Cr2 O3 accordingto ISO 5398 [ 15 ] , Cr according to ISO 9174 : 1998[16 ] and Mg according to ASTM D511203 [ 17 ] .Chrome sludge is a waste product of enzymatichydrolysis of chrome2tanned solid waste and it scomposition is given in Tab. 1. Typical composi2tion of chrome2tanned solid waste is given in Composition of chrome sludge1)表1 铬污泥成份Parameter ValueTS/ % 1614Ash/ % 3410N / % 114Cr2O3 / % 1215MgO / % 1115 1) based on total solidsTab12 Composition of chrome2tanned solid waste1)表2 铬鞣革固体废弃物成份Parameter ValueTS/ % 6911Ash/ % 1019N/ % 2011Cr2O3 / % 415 1) based on total solidsTab13 Composition of waste tanning liquor表3 鞣制废液成份Parameter ValueTS/ % 718Ash/ %1) 8713N/ %1) 018Cr/ (mg/ kg) 1 ,769Mg/ (mg/ kg) 693p H 412colour blue2green 1) based on total solidsWaste tanning liquor was obtained f rom tan2ning of cowhides and it s composition is presentedin Tab. experimental part was divided into twopart s. The fir st part contained five selected massratio s of chrome sludge ∶ waste liquor and threevarious dechromation times , see Table 4. Practicaldechromation was performed under laboratory con2ditions by stirring chrome sludge with waste tan2ning liquor at room temperat ure in accordance wit ht he scheme shown in Fig. 1. Af ter dechromation ,t he heterogeneous mixt ure was cent rif uged. A partof supernatant was analysed for Cr content . Theinvestigated object in view was quantity of residualchrome in waste tanning liquor af ter second part of test s followed up result s ofwaste liquor dechromation efficiency in t he first ex2perimental part . The mass ratio of chrome sludge∶waste liquor producing greatest dechromation ef2ficiency was selected and a series of test s per2formed to t he p urpo se of st udying dechromation re2action 1 Scheme of dechromation of waste tanning liquor图1 鞣制废液的脱铬流程3 RESULTSTest s and dechromation result s at variousmass ratios of chrome sludge ∶waste liquor and va2rious dechromation times are shown in t hen shows dechromation result s at mass ra2tio of chrome sludge ∶waste liquor = 1 ∶1 and va2rious dechromation times. Each test was performedt hreefold and arit hmetic mean calculated , standarddeviation ranged wit hin ±5 %.第4 期 P. Mokrejs ,et al :Recycling Technology for Waste Tanning Liquors 5© 1994-2008 China Academic Journal Electronic Publishing House. All rights reserved. Dechromation results of waste tanning liquor at mass ratios of Cr sludge/ waste liq. and dechromation times表4 铬污泥与废液不同质量比以及不同脱铬时间条件下鞣制废液的脱铬结果( g)sludge :liquort/ minIn2processpHCr liq. /( mg/ kg)Eff iciency/ %1 7114 ∶50 30 6134 - 7108 807 54142 90 190 89123 180 116 93154 20183 ∶50 30 6195 - 7148 146 91175 90 58 96176 180 33 98117 35171 ∶50 30 7121 - 7168 53 97108 90 33 98119 180 36 981010 50 ∶50 30 7130 - 7190 24 981711 90 23 981712 180 17 991013 70 ∶50 30 7148 - 8102 41 971714 90 32 981215 180 79 9516 1) Starting content of chrome in waste tanning liquor = 1769 mg/ kgTab1 5 Dechromation results of waste tanning liquor andtimes1)表5 铬污泥与废液质量比为1 ∶1 不同脱铬时间条件下鞣制废液的脱铬结果 minIn processpHCr liq./ ( mg/ kg)Eff iciency/ %1 4 7120 - 7133 438 75122 8 7127 - 7145 351 80123 12 7151 - 7189 299 83114 16 7176 - 7194 230 87105 20 7180 - 7191 206 88146 24 7181 - 7194 200 88177 28 7181 - 7196 139 92118 32 7182 - 7199 43 97169 36 7188 - 8103 32 981210 40 7190 - 8104 19 981911 60 7186 - 8106 28 981412 80 7187 - 8107 22 981813 100 7180 - 8111 35 9810 1) Starting content of chrome in waste tanning liquor =1769 mg/ kg ;mass ratio of chrome sludge ∶waste liquor = 1∶1Figure 2 shows column plot s representing re2sidual chrome content in waste tanning liquor af tert he dechromation procedure at various chromesludge ∶waste liquor ratios and various dechroma2tion times. With a mass ratio of 1 ∶7 af ter 30 mindechromation , a drop of chrome in liquor exceeding50 % was found , af ter 180 min the dechromationefficiency was greatest . Wit h a ratio of 1 ∶214 ,t he tendency of chrome content in liquor to de2crease wit h time was at it s greatest , residualchrome content in liquor coming down to 3314 ppmwhich represent s dechromation efficiency exceeding98 %. Wit h a ratio of 1 ∶114 t he tendency ofchrome decrease is similar , when t he greatest dropof chrome content in liquor was already recordedaf ter 90 min of dechromation ( to 3312 mg/ kg) .Wit h a ratio of 1 ∶1 , lowest level s of residualchrome in liquor were already at tained in 30 min ofdechromation app rox. 24 mg/ kg , representing al2most 99 % dechromation efficiency. A f urt her in2crease in dechromation times produced but negli2gibly decreased chrome content in liquor . Wit h aratio of 114 ∶1 , t he greatest drop of chrome con2tent in liquor was recorded af ter 90 min dechroma2tion. Fig13 shows dechromation kinetics of wastetanning liquor at mass ratio of chrome sludge ∶waste liquor = 1 ∶1 and various dechromationtimes. From result s it is obvious t hat af ter 40 min6 皮革科学与工程 第17 卷© 1994-2008 China Academic Journal Electronic Publishing House. All rights reserved. chrome content in waste tanning liq2uor decreased to approx. 20 mg/ kg , which com2pared wit h starting content of chrome in waste tan2ning liquor ( 1769 mg/ kg) signifies almost 99 %chrome removal efficiency. Further increases indechromation time did not show in markedly in2creased chrome removal efficiency , and values ofresidual chrome content in slurry fluct uated be2tween 20 and 35 mg/ DISCUSSIONDuring past decades , a t ransfer occurred of anotable part of tanning plant s f rom economicallyadvanced west European count ries to developingcount ries and to count ries of t he Asian continent .In latest year s , however , t he environmental loadproduced by t hese plant s became unsustainable andintensive negotiations on resolving t he mat ter gotunder way. When rest ructuring existing and con2st ructing new tanning plant s , issues coming partic2ularly under consideration are solid and liquidwastes containing chrome. Contamination ofgroundwater s wit h liquid wastes containing chromeis obvious. Release of chrome f rom solid wastes第4 期 P. Mokrejs ,et al :Recycling Technology for Waste Tanning Liquors 7© 1994-2008 China Academic Journal Electronic Publishing House. All rights reserved. proceed particularly t hrough elution by rainwith great hazard of groundwater danger of Cr ( III) oxidising to Cr (VI) was al2ready mentioned in t he fir st part of this cont result s showed t he solid waste product ,chrome sludge , may be successf ully employed to i2solate chrome f rom waste tanning liquors , and t hatwith an efficiency of app rox. 99 %. The advanta2ges of recycling technology may primarily comprisesimplicity and low demand for investment cost s ,which make it ideally applicable when recyclingwaste tanning liquor s especially in tanning plant sin t he developing of chrome2enriched sludge remainsan open issue. A feasible alternative is it s combus2tion and separation of chrome , which may be used ,e. g. in pigment manufacture. A particular compli2cation is presented by accompanying magnesium ,which is undesirable for t hese applications. Isola2ting magnesium f rom chrome sludge will be subjectof a following research. Employment of chrome2enriched sludge for p reparing f resh tanning bathsal so remains an open CONCLUSIONRecycling technology developed for removingchrome f rom waste tanning liquors wit h applicationof waste chrome sludge achieves almost 99 % effi2ciency. Dechromed waste liquor represent s a mini2mal load on t he environment . Chrome2enrichedsludge , following isolation of ot her accompanyingelement s (especially magnesium and calcium) com2plicating it s f urther processing , could serve to pre2pare pigment s. Result s of experimental measure2ment s and an elaborated mat hematical model of re2cycling technology will serve to propose an algo2rit hm of enclosed dechromation cycle cont rol whichwill be t he subject of pilot2plant test : The aut hors would like tot hank to The Minist ry of Education of The CzechRep ublic for financial support to t his work execu2ted under MSM Grant No : :[1 ] Process technology for recovery and recycling of chromi2um f rom leather waste and sludge , BLC , EV5VO542(1994 1996) .[2 ] Ludvik J . Chrome balance in leather processing [ J ] .UNIDO , US/ RAS/ 92/ 120/ 11 - 51 (2000) .[3 ] Mladek M ,et al . Leather indust ry waste t reatment [M] .State Technical Literature Publishing , Prague ( 1971) :261 - 265.[4 ] Rajamani S. A system for recovery and reuse of chromi2um f rom spent tanning liquor using magnesium oxide andsulphuric acid[J ] . UNIDO (2003) .[ 5 ] Covington A D , Sykes R L , Barlow J R , et al. A practi2cal chrome recovery system using magnesium oxide[J ] . JSoc Leather Technol Chem ,1985 , (69) :166 - 174.[6 ]Cotton F , Wilkinson G. Advanced Inorganic Chemist ry( A Comprehensive Text ) [ M ] . Academia , Prague(1973) . 788 - 803.[7 ] Hartford W H. Proceedings Chromium Symposium [J ] .Indust rial Health , Foundation , Pitt sburg (1989) .[8 ]Vijayalakshm R . A Study of the interaction of Cr ( III)complexes and their selective binding with B2DNA. Amolecular modelling approach[J ] . J Biom St ruc Dynam ,2002 (19) :1063 - 1072.[9 ] Chattopadhyay B. The environmental impact of wastechromium of tannery agglomerates in the east Calcuttawetland ecosystem[J ] . J Soc Leather Technol Chem ,2000(84) :94 - 100.[ 10 ] Cabeza L F. Isolation of protein product s f rom chromi2um2containing leather waste using two consecutive en2zymes and purification of final chromium product : Pilotplant studies [ J ] . J Soc Leather Technol Chem , 1999(83) :14 - 19.[11 ] Langmaier F. Product s of enzymatic decomposition ofchrome2tanned leather waste [J ] . J Soc Leather TechnolChem , 1999 (83) :187 - 195.[12 ] ISO 4684 , Determination of volatile matter.[ 13 ] ISO 4047 : 1998 , Determination of sulphated total ashand sulphated water insoluble ash.[14 ] ISO 5397 : 1984 , Determination of nit rogen and hidesubstance.[15 ] ISO 5398 , Determination of chromic oxide.[16 ] ISO 9174 :1998 , Water quality 2 Determination of chro2mium 2 Atomic absorption spect romet ric methods.[17 ]ASTM D511 - 03 , Standard test methods for calciumand magnesium in 皮革科学与工程 第17 卷© 1994-2008 China Academic Journal Electronic Publishing House. All rights reserved.