水厂铝盐污泥为除磷填料的雨水径流污染控制技术

针对金泽水源地雨水径流磷污染控制需求,以及现有雨水处理技术中传统填料对溶解性磷的去除率有待进一步提高的问题,开发出以给水厂污泥为基材的除磷颗粒,并通过低浓度、短时间、少用量的盐酸浸泡改性强化了除磷效果。当使用改性除磷颗粒作为主体填料,构建雨水源头处理的生态滞留池或末端处理的滤池时,过滤装置具有表面水力负荷高、出水磷浓度低的优点。中试装置运行结果表明,当表面水力负荷为0.25 m^3/(m^2·h),进水磷浓度约为1 mg/L时,出水磷浓度仍可稳定低于0.2 mg/L,溶解性磷的去除率高于80%。

Technology of Pollution Control for Rainwater Runoff with Phosphorus Adsorption Particles Made by Alum Sludge

Based on the need to control the phosphorus pollution from rainwater runoff in the Jinze water source and improve the removal efficiency of dissolved phosphorus in the rainwater treatment device with traditional fillers,phosphorus removal particles made by water treatment plant sludge were studied in this research project.Hydrochloric acid modification with low concentration,short immersing time and a little dosage was also conducted to enhance the phosphorus removal performance.The modified phosphorus removal particles,as major fillers,were used to establish a bioretention pond as source treatment device and a filter as terminal treatment device.The hydraulic surface loading was high and phosphorus concentration of effluent was low in these treatment devices.Results of the pilotscale treatment devices showed that the phosphorus concentration of effluent was lower than 0.2 mg/L steadily when the hydraulic surface loading was 0.25 m^3/(m^2·h)and the phosphorus concentration of influent was higher than 1 mg/L.The removal rate of dissolved phosphorus reached above 80%.