石英砂强化混凝(QSEC)是一种改进的处理水的混凝方法,以石英砂为重介质,加快絮凝物的沉降速率,减少沉降时间。影响QSEC效应且可手动控制的因素包括石英砂用量,混凝剂用量,污水pH值,搅拌时间,稳定时间,等。,它们的合理设置对水处理的结果至关重要。本文旨在研究QSEC的最优条件;首先,进行了单因素试验,以探索影响因素的最佳范围,其次是响应面方法(RSM)测试,以准确确定重要因素的最佳值。结果表明,加入石英砂并没有改善混凝处理的水质,絮凝物仅用了140秒就沉到了底部,泥沙量仅占污水总量的12.2%。石英砂用量,混凝剂用量,和污水pH值均对混凝效果有显著影响,并导致拐点。通过RSM测试得出了QSEC指导模型,和随后的模型优化和实验验证揭示了处理生活污水的最佳条件如下:聚合氯化铝(PAC)用量,阳离子聚丙烯酰胺(CPAM)用量,污水pH值,石英砂用量,搅拌时间,沉降时间为0.97g/L,2.25mg/L,7.22,2g/L,5分钟,30分钟,分别,处理后的污水浊度降至1.15NTU。
The quartz sand-enhanced
coagulation (QSEC) is an improved
coagulation method for treating water, which uses quartz sand as a heavy medium to accelerate the sedimentation rate of flocs and reduce the sedimentation time. The factors that influence the QSEC effect and can be controlled manually include the quartz sand dosage, coagulant dosage, sewage pH, stirring time, settling time, etc., and their reasonable setting is critical to the result of water treatment. This paper aimed to study the optimal conditions of QSEC; first, single-factor tests were conducted to explore the optimal range of influencing factors, followed by response surface methodology (RSM) tests to accurately determine the optimum values of significant factors. The results show that the addition of quartz sand did not improve the water quality of the
coagulation treatment, it took only 140 s for the floc to sink to the bottom, and the sediment volume only accounted for 12.2% of the total sewage. The quartz sand dosage, the coagulant dosage, and sewage pH all had a significant impact on the
coagulation effect, and resulted in inflection points. A QSEC-guiding model was derived through RSM tests, and subsequent model optimization and experimental validation revealed the optimal conditions for treating domestic sewage as follows: the polyaluminum chloride (PAC) dosage, cationic polyacrylamide (CPAM) dosage, the sewage pH, quartz sand dosage, stirring time, and settling time were 0.97 g/L, 2.25 mg/L, 7.22, 2 g/L, 5 min, and 30 min, respectively, and the turbidity of the treated sewage was reduced to 1.15 NTU.