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奶牛养殖废水厌氧出水的吹脱混凝处理试验研究

DOI: 10.11654/jaes.2015.02.024

Keywords: 沼液 UASB 氨吹脱 混凝

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Abstract:

为探索高效、可行的养殖废水处理方法,以马鞍山蒙牛现代牧场废水处理中的UASB出水为研究对象,进行吹脱和混凝试验处理.通过UASB出水吹脱处理试验,对比不同 pH值、吹脱时间、气液比(体积比)、温度等参数对氨氮的去除效果,再对吹脱出水进行混凝处理试验,选择PFS(聚合硫酸铁)、PAC(聚合氯化铝)为混凝剂,分别研究混凝剂投加量、pH值、搅拌速率、搅拌时间、沉淀时间对混凝效果的影响.结果表明:吹脱试验中,当pH值为11、吹脱时间为5 h、气液比为3000、温度为30 ℃时,氨氮去除效果最好,去除率达85.5%,UASB出水氨氮浓度由468.1 mg·L-1降到67.9 mg·L-1.混凝试验中,确定PFS为较佳混凝剂,当PFS投加量为2.85 g·L-1、搅拌速率为180 r·min-1、搅拌时间为4 min、沉淀时间为20 min时,处理效果最好,处理水CODCr和SS分别由713.4、458.0 mg·L-1降到154.1、123.2 mg·L-1,去除率分别达到78.4%和73.1%.出水氨氮略有降低,降至50.9 mg·L-1,最终出水达到《畜禽养殖业污染物排放标准》(GB 18596-2001)

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