Study on the Effect Influence Factors and the Optimal Operating Conditions to Treat the High Ammonia-Nitrogen Wastewater by SDMBR

摘要

The Sequencing dynamic membrane bioreactor - SDMBR was proposed and adopted in this study to treat the high ammonia-nitrogen wastewater according to the features of its wide sources, large emission, high difficulty to be treated and easily lead to serious eutrophication etc. Then, the effluence factors including HRT, MLSS, DO, and pH values, the treatment effect, And the optimum operating conditions of the reactor were deeply researched and analyzed by the single element, orthogonal experiments and the range analysis, the results were as following, Firstly, the period for the sludge acclimation and to start successfully of the SDMBR was 30 days, and the reactor has high treatment efficiency in this period with high ammonia nitrogen removal rate of more than 90% with the influent ammonia nitrogen Concentration of 130mg/L, Then, the single factor experiments including MLSS, DO, HRT and pH value were designed and operated and the optimum operating conditions were got as the MLSS, DO, HRT and pH value were 4000～6000mg/L 2～4mg/L 12h～18h and 7～9 respectively. Thirdly, through orthogonal test and range analysis to HRT, MLSS, DO and pH value, the experiment obtained that, according to influence degree, the 4 above-mentioned factors influencing on COD removal rate were sorted by HRT, MLSS, DO and pH value in descending order, and the operating parameters of HRT, MLSS, DO and pH value were 18h, 5g/L, 4mg/L and 7-9 respectively. Finally, through orthogonal test and range analysis to HRT, MLSS, DO and pH value, the optimal operating parameters of the SDMBR were pH value of 8, DO of 4mg/L, MLSS of 5g/L and HRT of 15h to treat the high ammonia-nitrogen wastewater. And the average total removal rates of COD, (NH_4)~+-N,TN under this optimal operating parameters were 94.64%, 95.31% and 77.62% respectively.