摘要
为确定煤灰渣作为垂直潜流人工湿地基质的可行性,通过静态吸附实验和煤灰渣去除生活污水中的磷素实验,表明煤灰渣对污水中磷素的吸附平衡时间较短,吸附速率较快。当温度降低时,煤灰渣的磷素吸附容量对吸附平衡浓度依赖性和吸附强度随之降低,最大理论吸附容量亦降低83.10%。在处理0.5m3/(m2·d)的生活污水中,煤灰渣对TP的平均去除率达86.03%,吸附方式包括物理吸附和化学吸附,同时得出煤灰渣最大磷素解析量占最大理论吸附容量的0.73%,在实际人工湿地应用中应注意磷素解析而形成的二次污染。
Many adsorption rate, isotherm capacity and column treatment runs were performed to determine the feasibility of removing phosphorus from wastewater by coal ash, used as the substrate material in a vertical-flow constructed wetland system. Phosphorus in the water sample was quickly removed by physical and chemical adsorption on the coal ash. At a lower temperature （5.0 vs. 25.0 ℃）, the capacity for phosphorus was lower and less dependent on the equilibrium concentration. Operating at a hydraulic loading of 0.5 m3/（m^2·d）, 86.03% of phosphorus in a domestic wastewater （TP= 2.89-5.67 mg/L, COD = 105-389 mg/L） was removed in the coal ash adsorber. Less than 1% of adsorbed P was released by desorption in the leaching test. The data suggest phosphorus in the feed will be effectively removed by coal-ash in a vertical-flow constructed wetland system without the risk of secondary pollution due to phosphorus release.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2007年第4期241-243,共3页
Environmental Pollution & Control
基金
国家"863"计划项目(No.2003AA601020)。
关键词
煤灰渣
人工湿地
磷素
基质
吸附
Coal ash Constructed wetland system Phosphorus Substrate Adsorption
