Microaerobic biodegradation of high organic load wastewater by phototrophic bacteria.
Microaerobic biodegradation of high organic load wastewater by phototrophic bacteria.
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DOI：
10.5897/ajb2010.000-3258
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发表时间：
2010-06
影响因子：
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通讯作者：
E. I. Madukasi;Guangming Zhang
中科院分区：
文献类型：
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作者：
E. I. Madukasi;Guangming Zhang
在间歇式光生物反应器中，以COD为最低值，研究了一株新的光营养菌对有机污染废水的生物修复效果。在这项工作中，添加3个单独的微量营养素，即铁，钼和镁，以及微量营养素与尿素的混合物对Rhodobacter sphaeroides Z 08在不同的光照强度下的高有机负荷废水的生物降解性能的影响进行了研究。铁、钼和镁的最大有机污染物去除率分别为42.3%、36.1%和32.3%，相应的生物量分别为989.7、978.8和888.6mgl-1。尿素的加入增加了废水的生物降解潜力与由此产生的碳氮比（C：N）从最初的200：1到200：5的变化。在4000流明的强辐射下，添加26 mgl-1亚铁和200 mgl-1尿素，细菌活性明显提高，有机污染物去除率达67.6%，而添加尿素和亚铁，化学需氧量分别降低80%、48%、90%和67%。总磷、总有机碳和总氮。此外，所得的生物质和纯化的废水的分析表明，主要的无机成分的废水被同化。
-1 COD) was used in a batch photo-bioreactor to study the effectiveness of new strain phototrophic bacteria in bioremediation of organic contaminated wastewater. In this work, effects of additions of three individual micronutrients, that is, ferrous, molybdenum and magnesium, and a mixture of micronutrient with urea on the performance of Rhodobacter sphaeroides Z08 in biodegradation of high organic load wastewater under varied light intensities were investigated. Maximum organic contaminates reduction were 42.3% for ferrous, 36.1% for molybdenum, and 32.3% for magnesium with the corresponding biomass of 989.7, 978.8 and 888.6 mgl -1 , respectively. Urea addition increased the wastewater biodegradation potential with the resultant change in carbon to nitrogen ratio (C:N) from initial 200:1 to 200:5. Binary supplement of 26 mgl -1 ferrous and 200 mgl -1 urea to the wastewater readily enhanced the bacteria activity leading to organic contaminates reduction of 67.6%, while optimum pollutants reduction was achieved when binary supplement of urea and ferrous was made under intense radiation of 4000 lumens yielding nearly 80, 48, 90 and 67% reductions of chemical oxygen demand, total phosphorus, total organic carbon and total nitrogen, respectively. In addition, analyses of the resultant biomass and the purified wastewater indicated that major inorganic constituents of the wastewater were assimilated.