碳酸钙和铁碳复合填料去除农村生活污水中的磷
- Title:
- Removal of Phosphorus in Rural Sewage by Calcium Carbonate and Iron-carbon Composite Filler
- Keywords:
- rural sewage; phosphorus removal; composite filler; calcium carbonate; iron-carbon micro-electrolysis
- 摘要:
- 采用碳酸钙和铁碳复合填料（简称复合填料）去除农村生活污水中的TP，以解决TP排放不达标问题。试验结果表明，当复合填料滤床水力停留时间（HRT）为4 h时，TP平均去除率在73%以上。通过XRD和XRF分析发现，复合填料中铁碳微电解产生OH-促进碳酸钙与磷酸根生成羟基磷酸钙沉积物是TP去除的重要方式。将该复合填料用于人工湿地或生物滤池后能提高对TP的去除。
- Abstract:
- Calcium carbonate and iron-carbon composite filler (composite filler for short) was proposed to remove TP to solve the problem that rural sewage TP discharge does not reach the standard. The average removal rate of TP was more than 73% when hydraulic retention time (HRT) of the composite filler bed was 4 hours. XRD and XRF analysis showed that OH- produced by the iron-carbon micro-electrolysis in the composite filler promoted calcium carbonate and phosphate to produce calcium hydroxyapatite sediment, which was an important way to remove TP. The removal of TP could be improved by using the composite filler in constructed wetland or biofilter.
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