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以广州市珠江流溪河下游为水源,采用GAC-石英砂滤池处理沉淀池出水,研究了该工艺对枯水期高氨氮原水的去除规律及其影响因素。结果表明:GAC-石英砂滤池滤与普通砂滤池相比氨氮的去除显著提高,滤后水氨氮平均值为2.08mg/L,去除量约为1.0mg/L,去除率为33.8%。研究显示氨氮处理效果受余氯的灭菌作用、溶解氧不足、原水水质下降、pH值不足、活性炭滤料吸附性能下降、空床接触时间短、反冲洗周期与强度的影响。建议降低前投氯而加强后投氯量,同时使用无氯水进行反冲洗;保持滤后水溶解氧在2～4mg/L且pH值>7.5;延长反冲洗周期至36h;适当降低运行负荷可提高GAC-石英砂滤池对氨氮的去除效果。
Taking the lower stream of Liuxi River in Pearl River of Guangzhou as water source, the GAC-quartz sand filter was used to treat the effluent from the sedimentation tank. The removal of high ammonia nitrogen raw water and its influencing factors during the dry season were studied. The results showed that the removal of NH3-N from GAC-quartz sand filter was significantly higher than that of common sand filter. The average value of NH3-N was 2.08mg / L and the removal rate was about 1.0mg / L. The removal rate was 33.8%. The results showed that the effect of ammonia nitrogen treatment was affected by the sterilization effect of residual chlorine, insufficient dissolved oxygen, the decrease of raw water quality, pH value, the adsorption performance of activated carbon filter, empty bed contact time, backwash cycle and strength. Proposed to reduce the amount of chlorine before the vote and to enhance the amount of chlorine after the vote, while the use of chlorine-free water backwash; keep the filtered water dissolved oxygen at 2 ~ 4mg / L and pH> 7.5; extend the backwash cycle to 36h; Can improve the GAC-quartz sand filter on ammonia removal.