Sánchez-Ramírez J E, Seco A, Ferrer J, Bouzas A, García-Usach F
Department of Chemical Engineering, University of Valencia, Av. de la Universidad s/n, 46100 Burjassot, Valencia, Spain.
Institute for Water and Environmental Engineering-Polytechnic University of Valencia, Camino de Vera, s/n, 46022 Valencia, Spain.
J Environ Manage. 2015 Jan 1;147:213-8. doi: 10.1016/j.jenvman.2014.04.043. Epub 2014 Sep 18.
This work studies the use of a well-known and spread activated sludge system (UCT configuration) to treat the effluent of a submerged anaerobic membrane bioreactor (SAnMBR) treating domestic wastewater. Ammonia, phosphate, dissolved methane and sulphide concentrations in the SAnMBR effluent were around 55 mg NH4-N L(-1), 7 mg PO4-P L(-1), 30 mg non-methane biodegradable COD L(-1), and 105 mg S(2-) L(-1) respectively. The results showed a nitrification inhibition caused by the presence of sulphur compounds at any of the solids retention time (SRT) studied (15, 20 and 25 days). This inhibition could be overcome increasing the hydraulic retention time (HRT) from 13 to 26 h. Among the sulphur compounds, sulphide was identified as the substance which caused the nitrification inhibition. When the nitrification was well established, removal rates of nitrogen and phosphorus of 56% and 45% were reached respectively. The sulphide present in the influent was completely oxidised to sulphate, contributing this oxidation to the denitrification process. Moreover, the presence of methanotrophic bacteria, detected by FISH technique, could also contribute to the denitrification.
本研究采用广为人知且应用广泛的活性污泥系统（UCT构型）处理浸没式厌氧膜生物反应器（SAnMBR）处理生活污水后的出水。SAnMBR出水中氨氮、磷酸盐、溶解性甲烷和硫化物的浓度分别约为55 mg NH₄-N L⁻¹、7 mg PO₄-P L⁻¹、30 mg非甲烷可生物降解COD L⁻¹和105 mg S²⁻ L⁻¹。结果表明，在所研究的任何固体停留时间（SRT，15、20和25天）下，硫化合物的存在都会导致硝化抑制。通过将水力停留时间（HRT）从13小时增加到26小时，可以克服这种抑制作用。在硫化合物中，硫化物被确定为导致硝化抑制的物质。当硝化作用良好建立时，氮和磷的去除率分别达到56%和45%。进水中的硫化物被完全氧化为硫酸盐，这种氧化作用有助于反硝化过程。此外，通过荧光原位杂交（FISH）技术检测到的甲烷氧化菌的存在也可能有助于反硝化作用。
