膜技术在印染废水深度处理中的工程应用及效益分析
发布时间：2018-10-29 11:02
【摘要】：我国人均淡水量较少,随着城镇用水量剧增,水资源短缺已成为制约我国社会经济发展的重要因素。中水回用作为一种提高水资源重复利用率的技术手段,为缓解印染行业高水耗的特点,越来越受到广泛的应用。同时国家及地方针对印染行业出台了一系列整治措施,目前迫切要求寻找一种有效、稳定的回用工艺用于印染生产企业,以满足节水、减污的目的。本论文针对印染废水二级生化出水,采用过滤、超滤澄清和反渗透浓缩的膜集成工艺进行深度处理后回用于生产过程。具体包括以下内容：超滤试验中通过改变化学清洗药剂种类和有无气洗的调整,考察运行工艺的稳定性。结果显示：在自动气洗的情况下投加DBNPA为最佳工况参数,超滤去除了部分细小悬浮物,经过超滤后水质较为澄清,出水浊度降至1NTU以下,满足反渗透进水水质预处理要求。通过药剂定期的反洗,超滤膜中试的透过液流量和循环液流量稳定通量分别为1600L/H和3100L/H,同时反洗后的通量恢复性能较好,运行均较稳定。反渗透系统在厂家设定工况条件下,连续运行一段时间,考察系统的稳定性及进出水水质。结果表明：反渗透工艺进水电导率波动较大,出水电导率波动较小；出水电导率与进水电导率的大小基本无关,且维持在一较低水平；同时检测其出水的COD值均达到相关回用水质设计标准。最后对本项目进行经济效益与环境效益分析,结果显示：项目投入运营后,每天可节省自来水2000m3,减排污染物浓度按进水浓度计,年投入使用时问为330天,年收益88.44万元,项目投资偿还期为5.28年,内部收益率为10.29%,其经济效益显著且风险较小。同时每年可减排废水量66万m3,减排CODCr132t/a、BOD533 t/a、NH3-N 13.2t/a、TP0.99t/a,其环境效益明显,为当地节能减排作出较大的贡献。
[Abstract]:With the rapid increase of urban water consumption, the shortage of water resources has become an important factor restricting the social and economic development of our country. Reclaimed water reuse as a technical means to improve the reuse of water resources is more and more widely used in order to alleviate the characteristics of high water consumption in printing and dyeing industry. At the same time, the state and the local government have issued a series of treatment measures for the printing and dyeing industry. At present, it is urgent to find an effective and stable recycling process for printing and dyeing production enterprises, in order to meet the purpose of saving water and reducing pollution. In this paper, the membrane integrated process of filtration, ultrafiltration clarification and reverse osmosis concentration was used for advanced treatment and reuse of secondary biochemical effluent from printing and dyeing wastewater. The main contents are as follows: in the ultrafiltration test, the stability of the operation process is investigated by changing the type of chemical cleaning agent and adjusting whether there is air washing or not. The results show that under the condition of automatic air washing, adding DBNPA is the best operating condition parameter, and ultrafiltration removes some fine suspended matter. After ultrafiltration, the water quality is clarified, and the turbidity of effluent drops below 1NTU, which meets the requirement of pretreatment of reverse osmosis influent water quality. The steady flux of permeating liquid and circulating liquid were 1600L/H and 3100L / H, respectively, and the flux recovery performance after backwash was better and the operation was stable. The reverse osmosis system was operated continuously for a period of time under the conditions set by the manufacturer to investigate the stability of the system and the water quality in and out of the system. The results show that the influent conductivity of reverse osmosis process fluctuates greatly, the fluctuation of effluent conductivity is small, the effluent conductivity is independent of the influent conductivity, and it is maintained at a low level. At the same time, the COD values of the effluent reached the relevant reuse water quality design standard. Finally, the economic and environmental benefits of the project are analyzed. The results show that after the project is put into operation, the tap water can be saved 2000m3 per day, the pollutant concentration can be reduced according to the influent concentration, the annual input time is 330days, and the annual income is 884400 yuan. The repayment period of the project investment is 5.28 years and the internal rate of return is 10.29. The economic benefit is significant and the risk is small. At the same time, the amount of waste water can be reduced by 660000 m3 per year, and the amount of NH3-N13.2t / a TP0.99t / a is reduced by CODCr132t/a,BOD533 t / a / N13.2t / a / a, which has obvious environmental benefits and makes a great contribution to local energy saving and emission reduction.
【学位授予单位】：浙江工商大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X791
本文编号：2297512
[Abstract]:With the rapid increase of urban water consumption, the shortage of water resources has become an important factor restricting the social and economic development of our country. Reclaimed water reuse as a technical means to improve the reuse of water resources is more and more widely used in order to alleviate the characteristics of high water consumption in printing and dyeing industry. At the same time, the state and the local government have issued a series of treatment measures for the printing and dyeing industry. At present, it is urgent to find an effective and stable recycling process for printing and dyeing production enterprises, in order to meet the purpose of saving water and reducing pollution. In this paper, the membrane integrated process of filtration, ultrafiltration clarification and reverse osmosis concentration was used for advanced treatment and reuse of secondary biochemical effluent from printing and dyeing wastewater. The main contents are as follows: in the ultrafiltration test, the stability of the operation process is investigated by changing the type of chemical cleaning agent and adjusting whether there is air washing or not. The results show that under the condition of automatic air washing, adding DBNPA is the best operating condition parameter, and ultrafiltration removes some fine suspended matter. After ultrafiltration, the water quality is clarified, and the turbidity of effluent drops below 1NTU, which meets the requirement of pretreatment of reverse osmosis influent water quality. The steady flux of permeating liquid and circulating liquid were 1600L/H and 3100L / H, respectively, and the flux recovery performance after backwash was better and the operation was stable. The reverse osmosis system was operated continuously for a period of time under the conditions set by the manufacturer to investigate the stability of the system and the water quality in and out of the system. The results show that the influent conductivity of reverse osmosis process fluctuates greatly, the fluctuation of effluent conductivity is small, the effluent conductivity is independent of the influent conductivity, and it is maintained at a low level. At the same time, the COD values of the effluent reached the relevant reuse water quality design standard. Finally, the economic and environmental benefits of the project are analyzed. The results show that after the project is put into operation, the tap water can be saved 2000m3 per day, the pollutant concentration can be reduced according to the influent concentration, the annual input time is 330days, and the annual income is 884400 yuan. The repayment period of the project investment is 5.28 years and the internal rate of return is 10.29. The economic benefit is significant and the risk is small. At the same time, the amount of waste water can be reduced by 660000 m3 per year, and the amount of NH3-N13.2t / a TP0.99t / a is reduced by CODCr132t/a,BOD533 t / a / N13.2t / a / a, which has obvious environmental benefits and makes a great contribution to local energy saving and emission reduction.
【学位授予单位】：浙江工商大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X791
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，本文编号：2297512
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