混凝法深度处理废纸造纸废水实验研究
Experimental study on advanced treatment of wastewater from waste paper papermaking by coagulation sedimentation
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摘要: 按照烧杯实验方法，重点考察了pH值、混凝剂种类和投加量等因素对生化处理后废纸造纸废水混凝处理效果的影响。实验结果表明：PAC作为混凝剂，PAM作为助凝剂联合处理该废水时，能够取得较好的去浊率、SS、色度和COD去除率。混凝沉淀最佳运行条件为：废水pH为6.5，含铝量10%的PAC和2 g/L的PAM投加量分别为1 mL/L、0.5 mL/L，浊度从35 NTU降低到1 NTU，去除率达97.1%，SS从30 mg/L降低到7 mg/L，去除率达76.7%，色度从64倍降低到18倍，去除率达71.9%，COD从95 mg/L降低到44.8 mg/L，去除率可达52.8%，取得了较好的去除效果，达到国家造纸废水新排放标准限值。Abstract: The flocculent treating methods of effluent after biochemical treatment were studied according to cup testing. The effects of pH value,varieties and dosage of flocculent reagents on wastewater from waste paper papermaking were mainly investigated. Based on the experiments, the optimal operating conditions were determined as follows: the pH was 6.5, the dosage of PAC containing 10 percent Al was 1 mL/L and PAM with 2 g/L concentration was 0.5 mL/L. Under the operating conditions, the turbidity value decreased from 35 NTU to 1 NTU, with the removal rate reaching 97.1%; the SS concentration decreased from 30 mg/L to 7 mg/L and its removal rate reached 76.7%; the chroma was reduced from 64 times to 18 times and the removal rate reached 71.9%; the COD concentration was reduced from 95 mg/L to 44.8 mg/L and the removal rate reached 52.8%. After the treatment, the water quality parameters meet national papermaking wastewater discharge standards.
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