HE Nan,WANG Rui,PENG Zhu,et al.Optimization of Collaborative Operation of Coagulation-Sedimentation and Microfiltration in Reclaimed Water Treatment Plant[J].China Water & Wastewater,2021,37(7):85-91.
再生水厂混凝沉淀—微滤协同运行优化研究
- Title:
- Optimization of Collaborative Operation of Coagulation-Sedimentation and Microfiltration in Reclaimed Water Treatment Plant
- Keywords:
- reclaimed water treatment plant; coagulation and sedimentation; microfiltration; modeling; operation optimization
- 摘要:
- 为解决再生水厂混凝沉淀—微滤工艺经验运行存在的问题，搭建中试系统以模拟实际运行工况，进行协同运行优化研究。在建立沉淀池出水浊度模型、浸没式连续微滤系统（CMF）跨膜压差增长模型和CMF反洗恢复率模型的基础上，以投药量和过滤周期为调控变量，建立了系统运行状态最佳和运行成本最低的多目标优化模型。通过中试系统经验运行与模拟优化运行的对比试验、不同过滤周期连续运行试验（以考察不同过滤周期对反洗及膜污染的影响）和水厂的生产性试验，确定了水厂优化运行方案。结果表明，在满足处理要求的前提下，通过优化混凝剂、预氯化剂投加量和延长过滤周期（由30 min延长至40 min），使该工艺段单位成本降低了19.50%，同时各单元处理效能得到充分发挥。
- Abstract:
- To solve the problems existing in experience operation of coagulation-sedimentation and microfiltration process in a reclaimed water treatment plant, a pilot system was built to simulate the actual operating conditions, and optimization of the collaborative operation was conducted. Based on the establishment of the sedimentation tank effluent turbidity model, transmembrane pressure growth model of submerged continuous microfiltration system (CMF) and CMF backwashing recovery rate model, the dosage and filtration cycle were used as control variables, and a multi-objective optimization model was established to realize the best operational condition and the lowest operational cost of the system. The optimal operation plan of the reclaimed water treatment plant was determined through the comparative test between the experimental operation and simulation optimization operation of the pilot system, continuous operation test of different filtration cycles (to examine the effect of different filtration cycles on the backwash and membrane fouling) and production test of the reclaimed water treatment plant. On the premise of meeting the treatment requirements, the per cost of the process was reduced by 19.50% through optimizing the coagulant dosage, pre-chlorination and prolonging the filtration cycle (from 30 min to 40 min), and the treatment efficiency of each unit was fully utilized.
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