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竖流式溶气气浮池提高二级出水水质的研究

Keywords: 溶气气浮,二级出水,深度处理

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Abstract:

溶气气浮技术对二级出水中的胶体粒子和微生物碎片等杂质具有很好的去除优势.试验通过小试装置优化了气浮预处理条件.适宜的絮凝条件是:采用三级搅拌,搅拌强度为50/30/20s-1,反应停留时间为20min.试验结果表明:溶气气浮池对二级出水中的COD、浊度等指标的去除效率随着聚合氯化铝的投加量增加而提高,而且对不同的进水水质具有较好的抗冲击能力,出水水质能满足城市污水一级排放标准(GB/T18918—2002)和城市杂用水水质标准(GB/T18920—2002);当气浮池表面负荷达到12.7m3/(m2.h),停留时间缩短到10min,浊度、COD、TP去除率分别提高到43%、42%、27%;另外,竖流式溶气气浮池分离区高度对出水质量有一定影响,增加分离区高度有利于出水水质的提高,但会增加构筑物的投资.

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