水资源全回收的MBR-NF新水源工艺中试研究
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摘要
针对实际城镇污水,以水质优于地表Ⅲ类(总氮<10 mg/L)、水量全回收为目标开展了MBR-NF新水源工艺中试研究。将部分NF浓水回流至MBR并达到平衡后,NF浓水中COD和Ca~(2+)浓度分别降低约40%和11%,实现了高回收率NF系统的稳定运行。在此基础上采用芬顿-生化技术处理剩余浓水,建立了水资源全回收的MBR-NF新水源工艺。NF对COD、氨氮和总磷的截留率分别高于60%、30%和75%,但对总氮基本无去除。MBR-NF工艺主要出水指标达到地表Ⅲ~Ⅱ类水质(总氮为5~10 mg/L),电耗和药剂消耗成本为1.17元/m~3,其中MBR、NF和浓水处理成本分别占39.3%、48.7%和12.0%,开发和应用低压NF膜及高回收率NF系统是降低工艺运行成本的关键。MBR-NF工艺出水水质优良,水量全回收,是一种有应用需求和发展前景的高品质再生水制备工艺。
To explore complete wastewater reclamation and ensure that the reclaimed water quality meets the classⅢor higher standard of the Environmental Quality Standards for Surface Water in China(TN<10 mg/L),a pilot-scale study on the MBR-NF process treating real municipal wastewater was conducted.By recirculating a part of the NF concentrate to MBR,the balanced COD and Ca~(2+)concentrations of NF concentrate decreased by 40%and 11%.The high recovery NF system could run stably.The rest NF concentrate was further treated by the Fenton-biochemical technology,so the MBR-NF process for complete wastewater reclamation was established.The rejection rates of COD,NH_4~+-N and TP by NF were higher than 60%,30%and 75%,respectively.But TN could not be removed by NF.The effluent quality of the MBR-NF process could meet the classⅢorⅡstandard(TN=5-10 mg/L).The operating cost of energy and chemicals consumption was 1.17 yuan/m~3.The ratios of operating costs of the MBR,NF and concentrate treating units were 39.3%,48.7%and 12.0%,respectively.Development and application of low pressure NF membrane and high recovery NF system are crucial to operating cost reduction.The MBR-NF process can produce high quality reclaimed wastewater with full water recovery.It is a feasible and promising technology for advanced wastewater reclamation.
To explore complete wastewater reclamation and ensure that the reclaimed water quality meets the classⅢor higher standard of the Environmental Quality Standards for Surface Water in China(TN<10 mg/L),a pilot-scale study on the MBR-NF process treating real municipal wastewater was conducted.By recirculating a part of the NF concentrate to MBR,the balanced COD and Ca~(2+)concentrations of NF concentrate decreased by 40%and 11%.The high recovery NF system could run stably.The rest NF concentrate was further treated by the Fenton-biochemical technology,so the MBR-NF process for complete wastewater reclamation was established.The rejection rates of COD,NH_4~+-N and TP by NF were higher than 60%,30%and 75%,respectively.But TN could not be removed by NF.The effluent quality of the MBR-NF process could meet the classⅢorⅡstandard(TN=5-10 mg/L).The operating cost of energy and chemicals consumption was 1.17 yuan/m~3.The ratios of operating costs of the MBR,NF and concentrate treating units were 39.3%,48.7%and 12.0%,respectively.Development and application of low pressure NF membrane and high recovery NF system are crucial to operating cost reduction.The MBR-NF process can produce high quality reclaimed wastewater with full water recovery.It is a feasible and promising technology for advanced wastewater reclamation.
引文
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[2]张攀,文湘华,王波,等.纳滤生产再生水示范工程运行效果分析[J].环境工程学报,2017,11(9):4985-4992.Zhang Pan,Wen Xianghua,Wang Bo,et al.Operation effect of a nanofiltration demostration project for producing reclaimed water[J].Chinese Journal of Environmental Engineering,2017,11(9):4985-4992(in Chinese).
[3]Wang J,Li K,Wei Y,et al.Performance and fate of organics in a pilot MBR-NF for treating antibiotic production wastewater with recycling NF concentrate[J].Chemosphere,2015,121:92-100.
[4]Kappel C,Kemperman A J B,Temmink H,et al.Impacts of NF concentrate recirculation on membrane performance in an integrated MBR and NF membrane process for wastewater treatment[J].J Membr Sci,2014,453:359-368.