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[目的]筛选去除地下水中铁和锰的理想预氧化剂。[方法]针对长沙近郊某镇地下水中铁和锰含量较高的特点,通过烧杯试验考察了过氧化氢、高锰酸钾和高锰酸盐复合药剂(PPC)3种氧化剂的预氧化效果。[结果]3种预氧化剂对铁的氧化效率均很高,在试验所进行的投加质量浓度范围内均能使铁的去除率保持在90%以上,其中以PPC对铁的去除率最高。3种预氧化剂对锰的预氧化效果不尽相同,当过氧化氢投加质量浓度为0.13 mg/L时,锰的去除率为25.6%;当高锰酸钾的投加质量浓度为9.25 mg/L时,锰的去除率为87.5%;当PPC投加质量浓度为6.00 mg/L时,锰的去除率为91.7%。[结论]PPC不仅具有预氧化的作用,其还原产物还具有助凝作用,是较为理想的预氧化剂。
[Objective] The research aimed to screen the ideal pre-oxidant to remove iron and manganese in groundwater. [Method] Aiming at the high content of iron and manganese in the groundwater of a certain town in the suburbs of Changsha, the preoxidation effect of three oxidants of hydrogen peroxide, potassium permanganate and permanganate composite (PPC) was investigated by beaker test. [Result] The three kinds of pre-oxidants had high oxidation efficiency for iron. The removal rate of iron was maintained above 90% within the mass concentration range of the test, among which the removal rate of iron by PPC was the highest. The three pre-oxidants have different pre-oxidation effects on manganese. When the concentration of hydrogen peroxide is 0.13 mg / L, the removal rate of manganese is 25.6%. When the concentration of potassium permanganate is 9.25 mg / L, the removal rate of manganese was 87.5%. When the concentration of PPC was 6.00 mg / L, the removal rate of manganese was 91.7%. [Conclusion] PPC not only has the function of pre-oxidation, but also has the effect of coagulant reduction. PPC is an ideal pre-oxidant.