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本文研究了现场饮水除砷及再生废水处理的工艺。用稀酸将原水pH降至6.0～6.5,再通过一个充填粒径为0.35～1.20mm、厚度为750mm的活性氧化铝滤罐。进水平均砷浓度为0.34～0.53mg/L,出水的平均砷浓度为0.014～0.028mg/L,平均除砷效率为94.7～95.9％。周期单位产水量≥4360m~3水/T·Al_2O_3。每立方米水的处理费用(包括化学品、滤料补充、废水处理)仅0.076元,低于饮水除氟的费用。强碱性含砷废水经中和及氯化铁混凝沉淀3天后,上清液中砷浓度降至0.009mg/L(远远低于0.5mg/L的排放标准),完全可以排放。
This paper studies on-site drinking water arsenic and regeneration wastewater treatment process. Raw water is reduced to a pH of 6.0-6.5 with dilute acid and passed through an activated alumina canister with a particle size of 0.35-1.20 mm and a thickness of 750 mm. The average arsenic concentration in influent was 0.34-0.53mg / L, the average arsenic effluent concentration was 0.014-0.028mg / L, and the average arsenic removal efficiency was 94.7-95.9%. Period unit of water production ≥ 4360m ~ 3 water / T · Al_2O_3. Per cubic meter of water treatment costs (including chemicals, filter replenishment, wastewater treatment) is only 0.076 yuan, lower than the cost of drinking water fluoride. After 3 days of neutralization and ferric chloride coagulation, the concentration of arsenic in the strong alkaline arsenic wastewater was reduced to 0.009mg / L (much lower than the emission standard of 0.5mg / L), which could be completely discharged.