Department of Applied Microbiology, Institute of Microbiology, Warsaw University, Warsaw, Poland.
Pol J Microbiol. 2010;59(4):241-7.
The utilization of pig manure as a source of nutrients for the dissimilatory reduction of sulfates present in phosphogypsum was investigated. In both types of media used (synthetic medium and raw pig manure) increased utilization of sulfates with growing COD/SO4(2-)ratio in the medium was observed. The percent of sulfate reduction obtained in synthetic medium was from 18 to 99%, whereas the value for cultures set up in raw liquid manure was from 12% (at COD/SO4(2-) of 0.3) up to as high as 98% (at COD/SO4(2-) equal 3.80). Even with almost complete reduction of sulfates the percent of COD reduction did not exceed 55%. Based on the results obtained it was concluded that the effectiveness of removal of sulfates and organic matter by sulfate-reducing bacteria (SRB) depends to a considerable degree on the proportion between organic matter and sulfates in the purified wastewaters. The optimal COD/SO4(2-)ratio for the removal oforganic matter was between 0.6 and 1.2 whereas the optimal ratio for the removal of sulfates was between 2.4 and 4.8.
研究了利用猪粪作为磷石膏中存在的硫酸盐异化还原的营养源。在使用的两种培养基（合成培养基和原始猪粪）中，均观察到随着培养基中 COD/SO4(2-)比值的增加，硫酸盐的利用率增加。在合成培养基中获得的硫酸盐还原百分比为 18%至 99%，而在原始液体肥料中培养的百分比为 12%（COD/SO4(2-)为 0.3），最高可达 98%（COD/SO4(2-)等于 3.80）。即使硫酸盐几乎完全还原，COD 的还原率也不超过 55%。根据获得的结果，可以得出结论，硫酸盐还原菌 (SRB) 去除硫酸盐和有机物的效率在相当程度上取决于净化废水中有机物和硫酸盐的比例。去除有机物的最佳 COD/SO4(2-)比值在 0.6 到 1.2 之间，而去除硫酸盐的最佳比值在 2.4 到 4.8 之间。
