【摘要】 研究了城市污水处理系统对直链烷基苯磺酸钠(LAS)的去除特性.在厌氧-缺氧-好氧条件下,进行了相应的序批式试验,确定了水相和泥相中LAS降解的动力学参数,建立了LAS在厌氧-缺氧-好氧状态下的去除动力学模型(考虑吸附作用),并对模型预测的结果与实际测量值进行了比较.结果表明,在不同的泥龄下,LAS在AAO系统中去除率达到99%,出水中只含微量的LAS(0~20μg.L-1).厌氧池、缺氧池及好氧池LAS污泥吸附量分别为490~710、280~390、69~109μg.g-1.序批式动力学降解试验还表明,厌氧去除速率系数K厌、缺氧的去除速率系数K缺与好氧的去除速率常数的比值分别为0.67和0.71,说明在同一污泥系统的厌氧和缺氧条件下,LAS也能被较好的降解.模型得到的各池混合液出水中LAS的浓度模拟结果与实测结果符合较好(误差<8%).更多还原

【Abstract】 The removal characteristics of linear alkylbenzene sulphonate（LAS） was studied in anaerobic/anoxic/oxic（AAO） municipal wastewater treatment processes.A removal（biological degradation and sorption） model was formulated,and kinetic parameters were evaluated with batch experiments under anaerobic,anoxic,oxic conditions.The resulting model calculations were then compared with sampling campaigns performed on AAO process.The results show that the removal efficiency of LAS in the AAO activated sludge processes is more than 99%.Effluent concentrations vary between 0 and 20(μg·L^-1).The concentration of LAS adsorbed by sludge in anaerobic tank,anoxic tank,aerobic tank is 490～710(μg·g^-1),280～390(μg·g^-1) and 69～109(μg·g^-1) respectively.From the result of biodegradation kinetic tests,it can be concluded that LAS is well biodegraded under anaerobic/anoxic/oxic conditions,and the removal rate of LAS in anaerobic and anoxic conditions accounts for respectively 67% and 71% of that in oxic condition.The model can well forecast the effluent quality of anaerobic/anoxic/oxic tank of the AAO process,and the relative error is less than 8%.更多还原