Development of Floating Plastic Media Filtration System for Water Treatment and Wastewater Reuse
Development of Floating Plastic Media Filtration System for Water Treatment and Wastewater Reuse
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用于水处理和废水回用的浮动塑料介质过滤系统的开发
DOI：
10.1081/ese-120023403
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
S. Vigneswaran
中科院分区：
文献类型：
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作者：
C. Chiemchaisri;C. Panchawaranon;S. Rutchatanunti;A. Kludpiban;H. Ngo;S. Vigneswaran
摘要采用浮式塑料滤料与砂滤系统联用处理城市污水处理厂的地表水和二级出水。该系统采用漂浮塑料介质去除地表水中的悬浮固体和污水处理厂二级出水中的沉淀磷。然后使用砂子过滤进一步去除悬浮固体。采用沸石层代替砂滤池吸附氨氮，达到污水回用的目的。地表水处理系统的应用表明，适宜的滤速为5m~3/m~2·h，最佳混凝剂为聚合氯化铝，适宜的塑料和砂床深度为40 cm。系统平均出水浊度为0.71NTU，平均悬浮物为0.94 mg/L。运行6h后，平均浊度和悬浮物的去除效率分别为96.26%和95.48%，低水头损失为40.4 cm。采用1.50m塑料浮床处理合成原水，对浊度为20和40 NTU的原水，近程和远期除浊效率分别为96.79~97.72%和81.81~94.61%。出水浊度小于5NTU，水头损失小于1.0m。该系统还用于二级出水处理。在直接过滤模式下，当塑料和砂床深度分别为60 cm和20 cm时，滤速为5m~3/m~2·h。运行6h和48h，浊度平均去除分别为60.3%和59.6%。采用1m~3/m~2·h的滤速和50：30 cm的塑料：沸石床可实现氨氮和磷酸盐的去除。处理24 h后，系统对悬浮物、浊度、BOD5和99.5%的去除效率分别为91.9%、94.6%、95.4%、97.3%和99.5%，出水N/L平均值为0.5mgN/L，P/L为0.02mgP/L。
Abstract Floating plastic media coupled with sand filtration system was applied for treating surface water and secondary effluent from municipal sewage treatment plant. The system employed floating plastic media for the removal of suspended solids in surface water and precipitated phosphorus from secondary effluent of sewage treatment plant. Sand filtration was then used to remove further the suspended solids. For the purposes of wastewater reuse, a zeolite layer was used instead of sand filter to absorb ammonium nitrogen. Application of system for surface water treatment suggested appropriate filtration rate of 5 m3/m2 h. Polyaluminum chloride was found to be the best coagulant with an appropriate plastic and sand bed depth of 40 cm. The system could produce average effluent turbidity and suspended solids of 0.71 NTU and 0.94 mg/L respectively. Average turbidity and suspended solids removal efficiencies were 96.26% and 95.48% with low headloss development of 40.4 cm at the end of 6 h operation period. When applying 1.50 m. floating plastic media bed for the treatment of synthetic raw water, short and long-term turbidity removal efficiencies were 96.79–97.72% and 81.81–94.61% for raw water containing turbidity of 20 and 40 NTU. It could produce the effluent with turbidity less than 5 NTU while having less than 1.0 m. headloss. The system was also applied for the secondary effluent treatment. An optimum filtration rate of 5 m3/m2 h was obtained when using plastic and sand bed depth of 60 and 20 cm under direct filtration mode. Average turbidity removal was 60.3% and 59.6% after 6 and 48 h of operation. It was also found that 1 m3/m2 h filtration rate and 50:30 cm of plastic:zeolite bed could be used to achieve both ammonium nitrogen and phosphate removal. Suspended solids, turbidity, BOD5, , and removal efficiencies were 91.9, 94.6, 95.4, 97.3, and 99.5% respectively after 24 h. As a result, the effluent from the system had average and of 0.5 mg N/L and 0.02 mg P/L.