以N-甲基吡咯烷酮(NMP)为唯一碳源和氮源,从锂离子电池阴极浆料搅拌装置清洗废水中筛选获得一株NMP高效降解菌NCSL-HH10,经16S r DNA测序及系统发育树分析,该菌属于污染伯克霍尔德氏菌.实验表明,该菌可在1500mg/LNMP废水体系,48h内实现1...以N-甲基吡咯烷酮(NMP)为唯一碳源和氮源,从锂离子电池阴极浆料搅拌装置清洗废水中筛选获得一株NMP高效降解菌NCSL-HH10,经16S r DNA测序及系统发育树分析,该菌属于污染伯克霍尔德氏菌.实验表明,该菌可在1500mg/LNMP废水体系,48h内实现100%NMP去除及94.3%TOC去除,高矿化度说明该菌具有较为完整的NMP降解路径.此外,该菌可在高达15000mg/LNMP体系实现NMP完全降解(100%),达到国内外文献报道最高的NMP降解浓度,且可实现较高矿化度(63.2%).选取10000mg/L NMP废水作为进水,发现Burkholderia contaminans NCSL-HH10可在开放体系60h内去除95.7%NMP及76.5%TOC,显著高于活性污泥(84h内去除39.0%NMP和30.2%TOC).展开更多
N-methyl-pyrrolidone(NMP)is an important solvent for the production of lithium batteries,which causes environmental pollution and wastes resources if it is directly discharged.The current commonly used vacuum distilla...N-methyl-pyrrolidone(NMP)is an important solvent for the production of lithium batteries,which causes environmental pollution and wastes resources if it is directly discharged.The current commonly used vacuum distillation recovery process suffers from high operating costs and high energy consumption.Therefore,this paper proposes a coupled pervaporation-adsorption(PV-A)process to recover NMP solvents from lithium battery production waste streams.In this process,pervaporation is used to dewater the NMP waste liquid,it was found that the water content in the raw material liquid decreased from the initial 8.3%(mass)to 0.14%(mass)after 400 min of dewatering,but the membrane separation performance decreased significantly when the water content of the raw material liquid decreased to 0.45%(mass),and at the same time,the NMP loss rate increased rapidly.An adsorption process was used to remove trace water from the remaining liquid,and the water content in the feed liquid under the optimal adsorption process conditions was reduced from 0.45%(mass)to 0.014%,which fully meets the purity requirements of electronics-grade NMP for the production of lithium batteries.Steady-state modeling and techno-economic evaluation of the proposed coupled process were carried out,and compared with vacuum distillation and pervaporation technologies,the results showed the PV-A process yielded the best techno-economic performance and the lowest environmental impact,and it can be used as an alternative process to the traditional NMP recycling technology.This study provides a new method for the recycling of NMP in the lithium battery industry.展开更多
随着新能源产业的快速发展,N-甲基吡咯烷酮(NMP)作为新能源生产中的关键溶剂,其产量及相应的废水排放量显著增加。本文提出了一种创新的生物强化处理技术,旨在对NMP废水作为城市污水处理厂的反硝化碳源进行强化以加快处理速率和处理深度...随着新能源产业的快速发展,N-甲基吡咯烷酮(NMP)作为新能源生产中的关键溶剂,其产量及相应的废水排放量显著增加。本文提出了一种创新的生物强化处理技术,旨在对NMP废水作为城市污水处理厂的反硝化碳源进行强化以加快处理速率和处理深度,以实现废水中硝酸盐、亚硝酸盐氮的高效去除,并降低污水处理成本。本文通过生物强化方法,在普通反硝化污泥中加入少量针对NMP作为反硝化碳源体系中降解氮的纯菌,实现硝酸盐、亚硝酸盐氮的高效去除。同时,本技术采用循环往复的工艺,将反硝化过程中释放的NH3通过硝化/反硝化进一步去除,解决了现有技术未涉及的问题。With the rapid growth of the new energy industry, N-methylpyrrolidone (NMP), a crucial solvent in new energy production, has seen a significant surge in its production and corresponding wastewater discharge. This paper introduces an innovative bioaugmentation treatment technology, specifically designed to enhance the use of NMP wastewater as a denitrification carbon source in urban sewage treatment plants. This is achieved by accelerating the treatment rate and depth, efficiently removing nitrate and nitrite nitrogen from wastewater, and reducing sewage treatment costs. Through a biological augmentation approach, this study introduces a small quantity of pure bacteria targeted at nitrogen degradation within the NMP denitrification carbon source system into regular denitrifying sludge, thereby achieving efficient removal of nitrate and nitrite nitrogen. Additionally, this technology employs a cyclic process that further removes NH3 released during denitrification through a combination of nitrification and denitrification, addressing issues not previously addressed by existing technologies.展开更多
基金supported by the Key Research and Development Program of Gansu Province(23YFGA0051)the Industrial Support Program for Higher Education Institutions of Gansu Province(2024CYZC-17).
文摘N-methyl-pyrrolidone(NMP)is an important solvent for the production of lithium batteries,which causes environmental pollution and wastes resources if it is directly discharged.The current commonly used vacuum distillation recovery process suffers from high operating costs and high energy consumption.Therefore,this paper proposes a coupled pervaporation-adsorption(PV-A)process to recover NMP solvents from lithium battery production waste streams.In this process,pervaporation is used to dewater the NMP waste liquid,it was found that the water content in the raw material liquid decreased from the initial 8.3%(mass)to 0.14%(mass)after 400 min of dewatering,but the membrane separation performance decreased significantly when the water content of the raw material liquid decreased to 0.45%(mass),and at the same time,the NMP loss rate increased rapidly.An adsorption process was used to remove trace water from the remaining liquid,and the water content in the feed liquid under the optimal adsorption process conditions was reduced from 0.45%(mass)to 0.014%,which fully meets the purity requirements of electronics-grade NMP for the production of lithium batteries.Steady-state modeling and techno-economic evaluation of the proposed coupled process were carried out,and compared with vacuum distillation and pervaporation technologies,the results showed the PV-A process yielded the best techno-economic performance and the lowest environmental impact,and it can be used as an alternative process to the traditional NMP recycling technology.This study provides a new method for the recycling of NMP in the lithium battery industry.
文摘随着新能源产业的快速发展,N-甲基吡咯烷酮(NMP)作为新能源生产中的关键溶剂,其产量及相应的废水排放量显著增加。本文提出了一种创新的生物强化处理技术,旨在对NMP废水作为城市污水处理厂的反硝化碳源进行强化以加快处理速率和处理深度,以实现废水中硝酸盐、亚硝酸盐氮的高效去除,并降低污水处理成本。本文通过生物强化方法,在普通反硝化污泥中加入少量针对NMP作为反硝化碳源体系中降解氮的纯菌,实现硝酸盐、亚硝酸盐氮的高效去除。同时,本技术采用循环往复的工艺,将反硝化过程中释放的NH3通过硝化/反硝化进一步去除,解决了现有技术未涉及的问题。With the rapid growth of the new energy industry, N-methylpyrrolidone (NMP), a crucial solvent in new energy production, has seen a significant surge in its production and corresponding wastewater discharge. This paper introduces an innovative bioaugmentation treatment technology, specifically designed to enhance the use of NMP wastewater as a denitrification carbon source in urban sewage treatment plants. This is achieved by accelerating the treatment rate and depth, efficiently removing nitrate and nitrite nitrogen from wastewater, and reducing sewage treatment costs. Through a biological augmentation approach, this study introduces a small quantity of pure bacteria targeted at nitrogen degradation within the NMP denitrification carbon source system into regular denitrifying sludge, thereby achieving efficient removal of nitrate and nitrite nitrogen. Additionally, this technology employs a cyclic process that further removes NH3 released during denitrification through a combination of nitrification and denitrification, addressing issues not previously addressed by existing technologies.
