自来水厂除锰滤砂的催化活性分析

Mn 2+ Oxidizing Bacteria and the Mn 2+ Removing Activity of the Filter Sand Used in Water Plants.

研究来自我国东北２个自来水厂的除锰滤砂对Ｍｎ２＋的催化活性，以确定微生物在除锰过程中的作用．利用ＰＹＣＭ培养基可在每ｇ湿砂上计到１０５－１０６个细菌，其中有４０％－５０％具有Ｍｎ２＋氧化能力．对滤砂表面的微生物进行原位培养，灭菌和ＨｇＣｌ２抑制，表明微生物群落的存在与稳定对于活性表面的存在与稳定是至关重要的．当生物活性被抑制后，锰砂残余活性约为原活性的２０％．这部分活性可能来源于化学催化．

The Mn 2+ removing activity of the filter sand from 2 Chinese Water Plants was analyzed to determine the role of the bacteria in the Mn 2+ removing Procession. Enumeration of bacteria on PYCM medium showed that there were 10 5-10 6 bacteria per g wet sand and about 40%-50% of the colonies had the ability to oxidize Mn 2+ .By the in situ enrichment of the bacteria, sterilization and the HgCl 2 inhibition of the mature sand, it was found that bacteria were indispensable to the maintenance of the activity of the sand. When the bacterial activity was inhibited,the activity of the sand was reduced to20% of the original one. The remaining activity might be due to the chemical catalysis. Bacteria were the major source of the Mn 2+ removing activity of the filters.