响应面法优化实际污水厂的除磷过程

实际污水厂除磷过程是一系列复杂的生物和化学反应集合，为综合考察各因素对总磷去除的影响，采用响应面法分析了碳氮比（C/N），碳磷比（C/P），有机负荷（F/M）等水质参数，以及排泥量，加药量，外回流比（R）等工艺参数和除磷表现之间的关系，并根据物料守恒建立了磷含量平衡模型.结果表明，从水质方面，C/N，C/P和F/M的最优范围分别是5.50~7.00，50.00~70.00和0.06~0.08d^-1，从运行方面，排泥量，加药量，R的最优范围分别为14.3t/万m³，35~40mg/L和65%~70%.分析建立的磷含量平衡模型，发现各参数对除磷影响程度的强弱依次是C/N，F/M，R，排泥量，C/P和加药量.当C/N和F/M等主要影响因素处于最优范围，且水厂运行状况稳定时，利用该模型能准确预测出水TP浓度.

Phosphorus removal process optimization of wastewater treatment plant by response surface methodology

The phosphorus removal is a series complex biological and chemical reactions in actual wastewater treatment plant (WWTP). In order to analyze the effects of various factors on total phosphorus (TP) removal, response surface methodology (RSM) was used. The water quality parameters such as carbon/nitrogen ratio (C/N), carbon/phosphorus ratio (C/P), organic load ratio (F/M), and process parameters such as sludge discharge amount (m), agent dosage and external reflow ratio (R) were all investigated. Phosphorus balance model was also established according to the material conservation. The results showed the optimal ranges of C/N, C/P and F/M were 5.50~7.00, 50.00~70.00 and 0.06~0.08d^-1, respectively. From operation aspect, the optimal ranges of m, agent dosage and R were 14.3t/10⁴m³, 35~40mg/L and 65%~70%, respectively. Through analyzing phosphorus balance model, it was found influence degree on phosphorus removal was C/N, F/M, R, m, C/P and agent dosage from largest to smallest. When the main influence factors such as C/N and F/M were in optimal ranges, and WWTP was stable, the model could predict the effluent TP concentration precisely.