Jobbágy A, Tardy G M, Palkó Gy, Benáková A, Krhutková O, Wanner J
Department of Applied Biotechnology and Food Sciences, Budapest University of Technology and Economics, Szt. Gellért tér 4, H-1111 Budapest, Hungary.
Water Sci Technol. 2008;57(8):1287-93. doi: 10.2166/wst.2008.232.
The purpose of the experiments was to increase the rate of activated sludge denitrification in the combined biological treatment system of the Southpest Wastewater Treatment Plant in order to gain savings in cost and energy and improve process efficiency. Initial profile measurements revealed excess denitrification capacity of the preclarified wastewater. As a consequence, flow of nitrification filter effluent recirculated to the anoxic activated sludge basins was increased from 23,000 m3 d(-1) to 42,288 m3 d(-1) at an average preclarified influent flow of 64,843 m3 d(-1), Both simulation studies and microbiological investigations suggested that activated sludge nitrification, achieved despite the low SRT (2-3 days), was initiated by the backseeding from the nitrification filters and facilitated by the decreased oxygen demand of the influent organics used for denitrification. With the improved activated sludge denitrification, methanol demand could be decreased to about half of the initial value. With the increased efficiency of the activated sludge pre-denitrification, plant effluent COD levels decreased from 40-70 mg l(-1) to < 30-45 mg l(-1) due to the decreased likelihood of methanol overdosing in the denitrification filter.
这些实验的目的是提高南佩斯污水处理厂联合生物处理系统中活性污泥反硝化的速率，以便节省成本和能源，并提高工艺效率。初步的剖面测量显示，预澄清废水具有过量的反硝化能力。因此，在平均预澄清进水流量为64,843立方米/天的情况下，回流至缺氧活性污泥池的硝化滤池出水流量从23,000立方米/天增加到42,288立方米/天。模拟研究和微生物调查均表明，尽管污泥龄较短（2 - 3天），活性污泥硝化作用仍由硝化滤池的回种引发，并因用于反硝化的进水有机物需氧量降低而得到促进。随着活性污泥反硝化作用的改善，甲醇需求量可降至初始值的一半左右。由于反硝化滤池中甲醇过量投加的可能性降低，活性污泥预反硝化效率提高后，工厂出水的化学需氧量水平从40 - 70毫克/升降至<30 - 45毫克/升。
