污水处理厂尾水强化混凝沉淀处理工艺
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摘要
采用投加助凝剂(PAM)、臭氧、粉末活性炭三种强化混凝沉淀工艺处理污水处理厂尾水,通过监测分析尾水处理前后的水质变化,研究助凝剂、臭氧、粉末活性炭对混凝沉淀工艺的强化效果。研究结果表明,混凝剂和助凝剂投加量比值为100:1时,COD_(Cr)、TP和浊度的去除效果明显提高,其中COD_(Cr)去除率比不投加助凝剂时提高将近15%。臭氧预氧化可以明显提高色度、氨氮、UV_(254)等指标的混凝去除效果,当投加5 mg/L的臭氧时,色度、UV_(254)的去除率比不投加臭氧时分别提升26.21%、17.89%。粉末活性炭不宜与混凝剂同时投加,混凝前30～60 min投加适量粉末活性炭(10～20 mg/L),可强化COD_(Cr)、TP和浊度的去除效果。
Three enhanced coagulation and sedimentation processes by dosing coagulant aid(PAM), ozone and powdered activated carbon, respectively, were used to treat tail water from a wastewater treatment plant.Changes of tail water quality before and after treatment were tested and analyzed, with the aim to investigate the strengthening effects of coagulant aid, ozone and powdered activated carbon on coagulation and sedimentation process.According to the results, when the dosage ratio of coagulant and coagulant aid was 100:1, the removal efficiencies of COD_(Cr), TP and turbidity were obviously improved, and the removal rate of COD_(Cr) was nearly 15% higher than that without dosage of coagulant aid.Pre-ozonation significantly improved the coagulation removal effects of chromaticity, ammonia nitrogen, UV_(254) and other indicators.When dosage of ozone was 5 mg/L, the removal rates of chromaticity and UV_(254) increased by26.21% and 17.89%,respectively.Powdered activated carbon should not be dosed with coagulant simultaneously,and the removal effects of COD_(Cr), TP and turbidity were enhanced by dosing powdered activated carbon of appropriate amount(20～30 mg/L) 30 ～60 min before coagulation process.
Three enhanced coagulation and sedimentation processes by dosing coagulant aid(PAM), ozone and powdered activated carbon, respectively, were used to treat tail water from a wastewater treatment plant.Changes of tail water quality before and after treatment were tested and analyzed, with the aim to investigate the strengthening effects of coagulant aid, ozone and powdered activated carbon on coagulation and sedimentation process.According to the results, when the dosage ratio of coagulant and coagulant aid was 100:1, the removal efficiencies of COD_(Cr), TP and turbidity were obviously improved, and the removal rate of COD_(Cr) was nearly 15% higher than that without dosage of coagulant aid.Pre-ozonation significantly improved the coagulation removal effects of chromaticity, ammonia nitrogen, UV_(254) and other indicators.When dosage of ozone was 5 mg/L, the removal rates of chromaticity and UV_(254) increased by26.21% and 17.89%,respectively.Powdered activated carbon should not be dosed with coagulant simultaneously,and the removal effects of COD_(Cr), TP and turbidity were enhanced by dosing powdered activated carbon of appropriate amount(20～30 mg/L) 30 ～60 min before coagulation process.
引文
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[6]李星,冯群英,杨艳玲,等.几种高效混凝剂去除水中痕量磷的效果[J].水处理技术,2007, 33(1):79-82.
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[9]修海峰,朱仲元,高乃云,等.粉末活性炭头强化处理高藻微污染水[J].工业用水与废水,2010, 41(3):14-18.
[10]郑淑平,李亚静,孙力平.聚合氯化铝与粉末活性炭联合强化混凝处理垃圾渗滤液[J].环境工程学报,2013, 7(7):2443-2446.
[11]任毅.粉末活性炭强化混凝处理含氨氮微污染水[J].人民珠江,2015, 36(5):106-108.
[12]马艳,高乃云,刘欣然,等.粉末活性炭吸附2,4,6-三氯酚的性能研究[J].同济大学学报(自然科学版),2011,39(12):1821-1826.