Two strategies for phosphorus removal from reject water of municipal wastewater treatment plant using alum sludge.
Two strategies for phosphorus removal from reject water of municipal wastewater treatment plant using alum sludge.
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DOI：
10.2166/wst.2009.609
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发表时间：
2009-12
期刊：
影响因子：
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通讯作者：
Y. Yang;Y. Q. Zhao;A. Babatunde;P. Kearney
中科院分区：
文献类型：
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作者：
Y. Yang;Y. Q. Zhao;A. Babatunde;P. Kearney
针对目前公认的城市污水处理厂污水处理的需要，提出了两种利用生活饮用水厂副产明矾泥对原水进行絮凝处理的除磷策略。一种策略是使用液体形式的明矾污泥与MWWTP中经过厌氧消化的活性污泥进行共调节和脱水。另一种策略是在固定床中使用脱水明矾土泥饼来固定废水中的磷，废水是指污泥浓缩过程的上清液和厌氧消化污泥的上清液的混合物。试验表明，明矾污泥能有效降低废水中的磷含量。共调节策略可将污泥上清液中的磷从597~675mgP/L降至0.14~3.20mgP/L，同时用于混合污泥调理的有机聚合物投加量也将显着减少。采用明矾土污泥床过滤污水的第二种方案具有良好的减磷效果。在过滤速度为1.0m/h的条件下，明矾污泥对磷的吸附能力为31 mg-P/g-污泥，这两种策略突出了明矾污泥在MWWTP污水处理过程中的有益利用，从而将明矾污泥转化为有用的材料，而不是垃圾填埋。
In view of the well recognized need of reject water treatment in MWWTP (municipal wastewater treatment plant), this paper outlines two strategies for P removal from reject water using alum sludge, which is produced as by-product in drinking water treatment plant when aluminium sulphate is used for flocculating raw waters. One strategy is the use of the alum sludge in liquid form for co-conditioning and dewatering with the anaerobically digested activated sludge in MWWTP. The other strategy involves the use of the dewatered alum sludge cakes in a fixed bed for P immobilization from the reject water that refers to the mixture of the supernatant of the sludge thickening process and the supernatant of the anaerobically digested sludge. Experimental trials have demonstrated that the alum sludge can efficiently reduce P level in reject water. The co-conditioning strategy could reduce P from 597-675 mg P/L to 0.14-3.20 mg P/L in the supernatant of the sewage sludge while the organic polymer dosage for the conditioning of the mixed sludges would also be significantly reduced. The second strategy of reject water filtration with alum sludge bed has shown a good performance of P reduction. The alum sludge has P-adsorption capacity of 31 mg-P/g-sludge, which was tested under filtration velocity of 1.0 m/h. The two strategies highlight the beneficial utilization of alum sludge in wastewater treatment process in MWWTP, thus converting the alum sludge as a useful material, rather than a waste for landfill.