复合材料静态处理煤矿高浓度含锰废水的研究

On removing high-concentrated manganese residue in the mining sewage with porous composites in static test

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。

This paper is aimed to present our study results on the over-standard problem of Mn^2＋ which has to be discharged in the sewage in a coalmine in Yunnan for the time being. As the result of our study, we have worked out a new type of composite materials used of removing Mn^2 ＋ . The material under way is made of Nano-zeolite and diatomite reasonably mixed with complex floeculant in it in the form of porous composites. In our study, we have done Mn^2＋ -removing tests with the Mn^2 ＋ contained in the black and rufous sewage of the mine. Besides Mn^2 ＋ , the sewage also contains much of suspended solids in the coal-mining left-over gangue. Experimental testing helps to discover the concentration of Mn^2＋ is 5.32 mg/L, in the black sewage of the coal mine whereas in the rufous sewage, the concentration of Mn^2＋ is 42.4 mg/L. Furthermore, the efficiency of removing Mn^2＋ from the black sewage can be expected to reach 70%, with the pH of effluent being 7.9, while with the rufous sewage, the removing efficiency can be as high as 91.0% with the pH of effluent going up to 7.1. At the same time, we have also studied the influential factors on the removing efficiency, such as Fe^3＋ , SS. In the condition with the presence of Fe^3＋ in the sewage along with the Mn^2＋ , the pH can be reduced. In addition, the Fe^3＋ in the sewage has been found to be a competitive adsorbent with Mn^2＋ , which may have adverse effect on the removing efficiency of Mn^2 ＋ with the composite material. Moreover, when there exists SS in the coalmine sewage,its presence proves to have no obvious influence on the removing of Mn^2 ＋ with the use of the composite material we have proposed.