WANG Jin-long.Discussion and Improvement on Design of UF and RO Process in a Water Reclamation Plant[J].China Water & Wastewater,2020,36(24):120-125.
再生水厂UF-RO双膜工艺的设计探讨及优化改进
- Title:
- Discussion and Improvement on Design of UF and RO Process in a Water Reclamation Plant
- Keywords:
- water reclamation; UF; RO; backwashing; membrane flux
- 摘要:
- 某再生水厂以污水处理厂出水为原水，采用超滤(UF)-反渗透(RO)“双膜”工艺，冬季最大净产水规模仅能达到设计值的80%。通过对设计参数与运行参数的对比研究发现，超滤及反渗透系统设计时，膜通量取值偏大，导致冬季实际产水量不足；同时，未充分考虑污水厂出水成分复杂、细菌含量高等特点，超滤未设计前处理防护工艺，超滤清洗、反洗周期取值偏高，反渗透杀菌频率取值偏低，导致系统自用水量增加；系统设计预留不足，未考虑反渗透离线清洗及设备维修的膜组备用。后续改造时，增加了超滤前的多介质过滤器，强化超滤预处理；同时增加高效池出水口、超滤产水池次氯酸钠投药点，强化反渗透控菌；增加2组超滤系统、1组反渗透系统，确保系统满负荷运行。建议类似项目在冬季进行中试，采用最不利水温时的膜通量，并充分考虑自用水量的损耗，同时应参考《城镇污水再生利用工程设计规范》（GB 50335—2016）的推荐值。
- Abstract:
- A water reclamation plant uses the ultrafiltration (UF) and reverse osmosis(RO) membrane process to treat the effluent of a sewage plant, and can only reach 80% of the designed treatment capacity in winter. Through the comparative study of design parameters and operation parameters, it was found that the designed membrane flux value of UF and RO was too large, resulting in insufficient winter water production. At the same time, since the effluent characteristics of the sewage plant such as complex components and many bacteria are not fully considered, the pretreatment and protection technology of UF is not designed. Since the UF cleaning backwash cycle is high and the RO sterilization frequency is low, the system water consumption is increased. Besides, there’s insufficient system design reservation and no standby membrane set for RO offline cleaning and equipment maintenance. In the following reconstruction, multi-media filters before UF are added to strengthen the UF pretreatment. At the same time, the sodium hypochlorite injection points of the high-efficiency tank outlet and the UF production tank are added to strengthen the bacteria control of the RO system. Two groups of UF systems and 1 group of RO system are added to ensure that the system can reach full load operation. It is recommended that similar projects should be piloted in winter, using the membrane flux at the most unfavorable water temperature, and the loss of self-consumption water should be fully considered. At the same time, recommended values in Code for Design of Municipal Wastewater Reclamation and Reuse (GB 50335-2016) should be referred.
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