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针对目前云南省某煤矿排放废水中Mn~(2+)超标的问题,利用一种新型复合材料进行除锰试验。该复合材料是纳米分子筛与硅藻土经合理复配后,掺入复配絮凝剂形成的。试验中优化了不同材料的复合方式、絮凝剂的复配比例与用量。利用复配的多孔材料,对云南某煤矿含有大量悬浮物、Mn~(2+)质量浓度为5.32 mg/L的黑色废水及Mn~(2+)质量浓度为42.4 mg/L的红褐色废水进行了Mn~(2+)去除效果研究。结果表明,黑色废水中Mn~(2+)去除率达到70%,出水pH值为7.9;红褐色废水中Mn~(2+)去除率达到91.0%,出水pH值为7.1。与此同时,还研究了废水中Fe~(3+)、固体悬浮物(SS)对Mn~(2+)去除效果的影响,废水中Fe~(3+)的存在使pH降低,并与Mn~(2+)产生竞争吸附,对复合材料除锰有不利影响,而SS的存在对Mn~(2+)的去除效果没有显著的影响。
Aimed at the problem of excessive Mn ~ (2+) in wastewater from a mine in Yunnan Province, a new type of composite material was used to remove manganese. The composite material is nano-molecular sieve and diatomaceous earth after reasonable compound, mixed with complex flocculant formed. In the experiment, the compounding method of different materials and the proportion and dosage of flocculants were optimized. Using the complex porous materials, a large amount of suspended solids in a coal mine in Yunnan Province, the concentration of Mn2 +2.32 mg / L of black wastewater and Mn2 + concentration of 42.4 mg / L of reddish brown wastewater Mn 2+ removal efficiency was studied. The results showed that the removal rate of Mn 2+ in black wastewater reached 70% and the effluent pH value was 7.9. The removal rate of Mn 2+ in reddish brown wastewater reached 91.0% and the effluent pH value was 7.1. At the same time, the effects of Fe 3+ and SS on the removal of Mn 2+ were also studied. The presence of Fe 3+ in the wastewater decreased the pH value, Mn 2+ produced competitive adsorption, which adversely affected the manganese removal of the composite material. However, the presence of SS had no significant effect on the removal of Mn 2+.