不同基质人工湿地处理低磷负荷生活污水的研究

通过野外模拟试验,考察了以煤渣和废弃水泥砂浆为主要基质的人工湿地在低温条件下对低磷负荷生活污水的除磷效果.结果表明,水泥砂浆的除磷效果较好,当HRT≥4 h时对TP的去除率可达到91%以上,出水TP<0.1 mg/L,但出水pH偏高;水泥砂浆与黄棕壤组合使用时,混合铺设时的除磷效果要好于分层铺设时的,出水TP<0.5 mg/L,且出水pH增幅较小,符合景观用再生水的水质要求;煤渣在低温、低磷负荷条件下的除磷能力较差,处理出水达不到景观用再生水的水质要求.

Different Substrates Used in Constructed Wetland for Treatment of Domestic Sewage with Low Phosphorus Load

Based on field simulated test, the phosphorus removal efficiency of constructed wetlands using cinder or scrap cement mortar as substrates was investigated under low temperature and low phos-phorus load. The results show that the scrap cement mortar has better phosphorus removal efficiency. When HRT is equal to or more than 4 h, the removal rate of TP is more than 91%, with the effluent TP of less than 0.1 mg/L. But the effluent pH is higher. When scrap cement mortar and yellow brown soil are used together, the phosphorus removal efficiency of mixed laying is better than that of layered laying, the effluent TP is less than 0.5 mg/L, and the effluent pH increases a little. It meets the reclaimed water quality requirement for landscape. The phosphorus removal efficiency of cinder is poorer under low tem-perature and low phosphorus load, and the effluent does not meet the reclaimed water quality requirement for landscape.