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Cleaner production of ammonium paratungstate by membrane electrolysis-precipitation of sodium tungstate solution

Tungsten 2023年第1期5卷 145-159页

作者： Afolabi Uthmon Olayiwola Hao Du Shao-Na Wang Biao Liu Ye-Qing Lv Bo Pan University of Chinese Academy of Sciences Beijing 100049China CAS Key Laboratory of Green Process and Engineering National Engineering Research Center of Green Recycling for Strategic Metal ResourcesInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China

The production of ammonium paratungstate(APT) is riddled with the generation of wastewater,which causes environmental problems.To solve the problem of wastewater generation at source,a membrane electrolysis-NH3·H2O precipitation method,which prevents wastewater generation and recycles the reagents used in the process,was proposed and investigated in this study.The electrolysis process was investigated based on parameters such as initial cathodic and anodic NaOH concentrations,and current density.The results showed that an increase in current density and initial cathodic NaOH concentration and a decrease in the initial anodic NaOH concentration would enhance the separation of tungsten and sodium.The optimum condition was found at a current density of 666 A·m^(-2),initial anodic and cathodic NaOH concentrations of 69 g·L^(-1) and 40 g·L^(-1),with a current efficiency of 75.40%,and energy consumption for producing 1 ton of NaOH was 2184 kW·h.The precipitation process was investigated based on the acidic high W/Na molar ratio solution obtained by the electrolysis process with NH3·H2O as the precipitant.Parameters such as excessive coefficient,temperature,and W/Na molar ratio were studied.The result showed that the variation of excessive coefficient and solution temperature had an opposite effect on the purity of the APT,while an increase in the W/Na molar ratio would increase the product purity.The precipitation product obtained had a purity of 99.6% and was characterized using X-ray diffraction,inductively coupled plasma,and scanning electron microscopy.The methods proposed in this study could provide fundamental information for the design of a cleaner APT production process.

关键词： Membrane electrolysis Ammonium paratungstate Separation of sodium and tungsten ions Ion states of tungsten Cleaner production

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Technical measures to achieve a Cleaner production mode for recycled paper mills

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Frontiers of Environmental Science & Engineering 2010年第4期4卷 466-474页

作者： Chao HE Zhaolin GU Shucheng YANG Jidong LIANG Weina DAI Yanling HE School of Mechanical Engineering Xi’an Jiaotong UniversityXi’an 710049China School of Human Settlements and Civil Engineering Xi’an Jiaotong UniversityXi’an 710049China Department of Environmental Science and Engineering Xi’an Jiaotong UniversityXi’an 710028China

China’s paper production reached 79.8×10^(6) t in 2008 and ranked number one in the world.Because of its high consumption of water,energy and materials and its serious pollution,the present processes are not likely to be sustainable.An alternative,the closed Water Loop-Papermaking Integration(WLPI)method,is put forward in this paper.The WLPI method can be realized in a recycled paper mill by adding technologies and using recycled water.Many industrial case studies have shown that a large quantity of water,energy and materials can be saved,and the quantity of waste sludge and wastewater discharge was minimized by using the WLPI method.The design of the water reuse system,control of calcium hardness,water recycling and minimal waste sludge are discussed.Anaerobic technology plays an important role in the WLPI method to lower cost,energy use and waste.In the brown paper and coated white board production,zeroeffluent discharge can be realized.Fresh water consumption is only 1-2m^(3)·t^(-1).For the paper mills with deinking and bleaching processes,about 10 m^(3)·t^(-1) of fresh water and a similar amount of effluent discharge are needed.Power saving using anaerobic technology is 70%when recycled water is used in comparison with the conventional activated sludge process.Waste sludge can be decreased to about 5%of the initial process due to reuse of the waste sludge and the lower bio-sludge production of the anaerobic process.

关键词： water reuse zero discharge anaerobic treatment recycled paper Cleaner production

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Cleaner production for continuous digester processes based on hybrid Pareto genetic algorithm

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Journal of Environmental Sciences 2003年第1期15卷 129-135页

作者： JIN Fu\|jiang, WANG Hui, LI Ping (Institute of Industrial Process Control, Zhejiang University, Hangzhou 310027, China. Institute of Industrial Process Conlnil Zhejiang University Hangzhnu 310027

Pulping production process produces a large amount of wastewater and pollutant emitted, which has become one of the main pollution sources in pulp and paper industry. To solve this problem, it is necessary to implement Cleaner production by using modeling and optimization technology. This paper studies the modeling and multi\|objective genetic algorithms for continuous digester process. First, model is established, in which environmental pollution and saving energy factors are considered. Then hybrid genetic algorithm based on Pareto stratum\|niche count is designed for finding near\|Pareto or Pareto optimal solutions in the problem and a new genetic evaluation and selection mechanism is proposed. Finally using the real data from a pulp mill shows the results of computer simulation. Through comparing with the practical curve of digester,this method can reduce the pollutant effectively and increase the profit while keeping the pulp quality unchanged.

关键词： Cleaner production multi\|objective optimization genetic algorithm Pareto stratum concentration of residual alkali Kamyr continuous digester

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Design of policy mechanism to promote Cleaner production in China

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Journal of Environmental Sciences 2001年第3期13卷 346-350页

作者： ZHANG Tian zhu(Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China. Department of Environmental Science and Engineering Tsinghua University Beijing 100084 China

In order to promote Cleaner production in China, a package of policy options was presented based on the identification of the barriers encountered in the CP demonstration project and the effectiveness and feasibility of policy options for the CP implementation were analyzed. Furthermore, the policy mechanism framework was given, which composes of compulsory, economic incentive, social pressure and supportive function. Finally, the implementation strategy of the policy mechanism, in which the emphasis will be changed from compulsory policy options towards economic and social pressure policy options, was proposed.

关键词： Cleaner production barrier identification policy mechanism China

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The research progress of sugar industry Cleaner production

The research progress of sugar industry cleaner production

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2015 2nd International Conference on Machinery,Materials Engineering,Chemical Engineering and Biotechnology(MMECEB 2015)

作者： Jian Qiao Shaohong You Lili Ma Luxiang Li Caimin Wei Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology Guilin University of Technology Guangxi Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area Guilin University of Technology

ISBN: (纸本)9781510819092

From the beginning of the last century,the sugar industry has been undergoing reform and advance.In the global economy,the traditional sugar industry chain has been unable to promote economic development,and this development is not based blindly on raise sugar content and sugar yield of sugarcane.We should combine development with current increasingly serious environmental pollution situation.Sugar waste water and sludge and other waste contains high concentrations of organic matter and high acidity [1].According to the concept of Cleaner production,make targeted help in the press,clarification,filtration,evaporation,boiling sugar crystals each step of sugar production can improve efficiency both of technology and equipment.Through closed circuit process such as condensation and cooling recycled water supply system to achieve water-saving and reducing emission,it could also help the sugar industry to achieve sustainable development.

关键词： Sugar cane Sugaring Cleaner production Water-saving and reducing emission Cyclic utilization Cleaner production sugarcane Sugar industry sugar yield Sugar production

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Green chemistry of chromate Cleaner production

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Chinese Journal of Chemistry 1999年第3期17卷 258-266,202页

作者：张懿李佐虎齐涛王志宽郑诗礼 Institute of Chemical Metallurgy Chinese Academy of Sciences Beijing 100080 China

Research topics and methods of green chemistry in chromate production are introduced in this paper. New original green chemical process of the heterogeneous reaction and separation system of liquid phase oxidation of chromite in molten salt of sodium hydroxide—one way separation in high concentration medium—metastable phase separation—carbonate recycle conversion has been developed. The green commercial process for comprehensive utilization of mineral resources—reactant recycle inside the process—zero emission was established.

关键词： Green chemistry Cleaner production liquid phase oxidation zero emission

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Level and potential of Cleaner production in Baosteel's sintering process

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Baosteel Technical Research 2010年第2期4卷 36-39页

作者： ZHOU Maojun WANG Yuefei Ironmaking Plant Baoshan Iron ＆ Steel Co. Ltd. Shanghai 200941 China

It is necessary for the sintering process to carry out Cleaner production, which is also of great significance to the iron and steel enterprises of a long-flow process. According to the Cleaner production standard recently issued by China＇ s Ministry of Environmental Protection, the research detailed in this study has analyzed and estimated the level of Cleaner production at Baosteel in the aspects of technical equipment, resource and energy utilization, product quality, emissions, recycling and environmental management, etc. The research also expatiated some effective measures with which Cleaner production can be carried out in Baosteel＇s sintering process, and discovered some potential opportunities of Cleaner production.

关键词： sinter Cleaner production total energy consumption discharge

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The Research on a New Cleaner production Model for Flying Ash Aerated Concrete production

The Research on a New Cleaner Production Model for Flying As...

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第24届中国控制与决策会议

作者： WANG Xiaohong 1 , YIN Yueqing 2 , Dong Huijun 1 1. University of Jinan, Jinan 250022, China2. Shandong Shenghan Finance and Trade Vocational College, Jinan 250022, China

In view of the issue on the secondary environment pollution of flying ash aerated concrete dust, a new type of Cleaner production program is proposed. And a model of the Cleaner production is established. The main device of the dust collector is jet dust scrubber. By controlling the air volume, air speed of the dust collector dust fan and keeping the dynamic balance of the dust scrubber, we can achieve the purpose of dust removal. To keep the dynamic balance of the dust scrubber, here we use fuzzy PID controller to realize it. The dynamic model of the pool can avoid the sludge elimination and possibility of secondary pollution. And also the recycled substances can be used as raw materials for the production. The moist air can be feedback to the workshop to keep certain humidity and suppress dust flying .This model can achieve Cleaner production.

关键词： Aerated Concrete Cleaner production Fuzzy PID Dynamic Balance of Liquid Level Control

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Design of information management system for Cleaner production in enterprises,based on B/S structure

Design of information management system for cleaner producti...

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2011 International Conference on Materials for Renewable Energy & Environment(ICMREE 2011)

作者： Dinggui Luo Hongguo Zhang Diyun Chen School of Environmental Science&Engineering Guangzhou University Guangzhou China 510006

Cleaner production audit is an important prerequisite, as well as the key and core,for enterprises to implement Cleaner production.B/S structure is defined as a new network management information system platform on the basis of the web technology.This paper combines the advantages of B/S structure with the process of Cleaner production audit to explore the design of information management system on Cleaner production.There are 10 functional modules,including user management,planning and organization,pre-evaluation, evaluation,plan generation and screening,feasibility analysis, plan implementation,Cleaner production evaluation,and announcement issuance modules,continuous Cleaner production, Cleaner production evaluation,and announcement.There are 8 relative databases,containing plan and organization,business profile,production status,business environment,business management status,monitoring and analysis aming at the emphasis of audit,continuous Cleaner production,and Cleaner production assessment.The information management system on Cleaner production contributes to the construction of standardization,automation and information technology of Cleaner production audit,as well as lay the foundation for further promoting the building of the information database of regional Cleaner production. This electronic document is a"live"template.The various components of your paper[title,text,heads,etc.]are already defined on the style sheet,as illustrated by the portions given in this document.

关键词： Cleaner production information management system B/S structure

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Supercritical fluid technology as a sustainable alternative method for textile dyeing:An approach on waste,energy,and CO_(2)emission reduction

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Journal of Environmental Sciences 2024年第6期140卷 123-145页

作者： Carlos Rafael Silva de Oliveira Patrícia Viera de Oliveira Leandro Pellenz Catia Rosana Lange de Aguiar Afonso Henrique da Silva Júnior Federal University of Santa Catarina Textile Engineering Department2514 João Pessoa St.BlumenauSC89036-004Brazil Federal University of Santa Catarina Chemical Engineering DepartmentS/n Biotério Central St.FlorianópolisSC88040-900Brazil

The clothing industry is considered one of the most polluting industries on the planet due to the high consumption of water,energy,chemicals/dyes,and high generation of solid waste and effluents.Faced with environmental concerns,the textile ennoblement sector is the most critical of the textile production chain,especially the traditional dyeing processes.As an alternative to current problems,dyeing with supercritical CO_(2)(scCO_(2))has been presented as a clean and efficient process for a sustainable textile future.Supercritical fluid dyeing(SFD)has shown a growing interest due to its significant impact on environmental preservation and social,economic,and financial gains.The main SFD benefits include economy and reuse of non-adsorbed dyes;reduction of process time and energy expenditure;capture of atmospheric CO_(2)(greenhouse gas);use and recycling of CO_(2)in SFD;generation of carbon credits;water-free process;effluent-free process;reduction of CO_(2)emission and auxiliary chemicals.Despite being still a non-scalable and evolving technology,SFD is the future of dyeing.This review presented a comprehensive overview of the environmental impacts caused by traditional processes and confronted the advantages of SFD.The SFD technique was introduced,along with its latest advances and future perspectives.Financial and environmental gains were also discussed.

关键词： Textile industry Supercritical dyeing Sustainable processes Water free dyeing Energy saving Cleaner production

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