水处理厂生产废水联合循环可行性研究

摘要(中文译文)

本研究探讨了通过沉淀池排泥水（SSW）与滤池反冲洗水（FBW）联合回流实现饮用水处理厂生产废水回用的可行性。采用烧杯试验与响应面法（RSM）优化回流点、混凝剂投加量及回流比。单因素实验表明，SSW与FBW直接回流比例为4%~6%时浊度去除效果最佳，而其上清液（SSS与FBS）以4%比例回流对UV₅₄去除更为有效。RSM优化结果表明，回流比是影响污染物去除的主导因素。在最优条件下（预投加回流、PACl投加量16.84 mg/L、回流比5.38%），浊度与UV₅₄去除率分别达到94.69%和63.87%。值得注意的是，SSS与FBS联合回流使UV₅₄去除率进一步提升至70.05%。联合回流工艺在保持出水水质的同时还可降低混凝剂消耗15%~20%。在实验室条件下，本研究证明了该废水回用策略的技术可行性与潜在节能效益，尚待中试规模验证。

Abstract

This study investigates the feasibility of reusing production wastewater from drinking water treatment plants through combined recirculation of sedimentation sludge water (SSW) and filter backwash water (FBW). Jar tests and response surface methodology (RSM) were employed to optimize the recirculation point, coagulant dosage, and recirculation ratio. Single-factor experiments revealed that direct recirculation of SSW and FBW at 4%-6% achieved optimal turbidity removal, while recirculation of their supernatants (SSS and FBS) at 4% was more effective for UV₅₄ removal. RSM optimization indicated that the recirculation ratio was the dominant factor influencing pollutant removal. Under optimal conditions (predosage recirculation, PACl dosage of 16.84 mg/L, recirculation ratio of 5.38%), turbidity and UV₅₄ removal rates reached 94.69% and 63.87%, respectively. Notably, combined recirculation of SSS and FBS further enhanced UV₅₄ removal to 70.05%. The combined recirculation process also reduced coagulant consumption by 15%-20% while maintaining effluent quality. Under laboratory conditions, this study demonstrates the technical feasibility and potential energy-saving benefits of the proposed strategy for wastewater reuse, pending pilot-scale validation.

如何引用

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