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利用中试研究了针对内蒙古某水厂高砷地下水的除砷技术方案,并优化了其工艺参数,初步确定了其除砷效能。结果表明,针对当地地下水水质特征,其基本除砷方案宜采用投加除砷药剂反应后进行过滤的方法。其中,除砷药剂宜采用氯化铁与高锰酸钾的复合药剂,其配比(以铁和高锰酸钾的质量计)采用4∶1;除砷药剂投加后的反应时间宜控制在2 min左右;采用锰砂与石英砂的双层过滤单元,滤层总厚度不小于1.0 m,其中锰砂厚度宜大于30 cm,且滤速控制在5~7m/h为宜。针对优化后工艺参数的长期验证试验结果表明,出水的砷、锰含量分别稳定在5μg/L和0.05 mg/L以下。
A pilot scheme for removing arsenic from high-arsenic groundwater in a water plant in Inner Mongolia was studied and the process parameters were optimized. The arsenic removal efficiency was initially determined. The results show that according to the local groundwater quality characteristics, the basic arsenic removal method should adopt the method of adding arsenic removal reagent and filtering after reaction. Among them, the removal of arsenic should use ferric chloride and potassium permanganate composite agents, the ratio (with iron and potassium permanganate quality meter) using 4: 1; addition of arsenic should be controlled after the reaction time At about 2 min. The double filter unit with manganese sand and quartz sand should have a total filter thickness of not less than 1.0 m. The thickness of manganese sand should be larger than 30 cm and the filtration speed should be controlled at 5 to 7 m / h. Long-term validation of the optimized process parameters showed that the arsenic and manganese contents of effluent were stable at 5μg / L and 0.05mg / L, respectively.