过氧化钙原位修复黑臭水体底泥对上覆水的影响

Effect of in-situ remediation of contaminated sediment with calcium peroxide on overlying water

底泥污染控制是黑臭水体治理的难点之一,以受污染底泥为研究对象,考察过氧化钙(CaO2)原位化学修复对底泥黑臭的去除效果以及对上覆水中总磷、氨氮、COD、pH、溶解氧和重金属的影响,结果表明,底泥中投加过氧化钙处理后,底泥AVS(酸性挥发硫)可以降低72%以上,与对照组相比上覆水中TP降低85.5%,氨氮降低17.2%,DO由1.0mg/L上升到5.0 mg/L以上,Zn元素的浓度由0.7~1.3mg/L下降到0.05~0.15mg/L;同时也发现上覆水COD上升22.8%,Cu元素的浓度由0.02~0.09mg/L上升到0.1~0.2mg/L。

Sediment pollution control is one of the difficulties in the treatment of black and odorous water bodies.in order to control endogenous sediment pollution,calcium peroxide was used for in-situ chemical remediation of sediment.The results show that after adding calcium peroxide into the sediment,the AVS(acid volatile sulfur)in the sediment could be reduced more than72%,compared with the control group in the overlying water,TP was reduced by 85.5%,NH3-N was reduced by 17.2%,DO was changed from 1.0mg/L to 5.0mg/L,and the concentration of Zn decreased from 0.7~1.3mg/L to 0.05~0.15mg/L,Simultaneously COD in the overlying water increased by 22.8%,and the concentration of Cu was increased from 0.02~0.09 mg/L increased to 0.1~0.2mg/L.