生物处理含盐污水的盐抑制动力学

生物处理含盐污水时,由于无机盐对生物系统的影响,常常会导致低的有机物去除速率和去除效率。为了定量盐度对有机物生物去除的影响,研究生物处理含盐污水的盐抑制动力学,为具体设计含盐污水生物处理过程提供依据。试验采用间歇活性污泥法,对含盐污水的有机物降解速率和去除效率进行了研究。为了获得基本数据,首先研究了淡水环境下的基质降解动力学,然后对10~35g/L盐度环境分别进行试验。试验发现,盐度对生物处理系统的抑制属于非竞争模式,同时影响了最大降解速率和饱和常数。试验确定的盐抑制常数KY为2333mg/L,并进一步给出了各盐度下有机物降解速率方程。

Salt inhibition kinetics in biological treatment of saline wastewater

The performance of biological treatment processes for saline wastewater is usually low due to adverse effects of salt on microbial flora. High salt concentration in wastewater can result in low COD removal rate and efficiencies. In order to quantify the effects of salt on organic pollutant removal and supply basic information for the design of treatment system for saline wastewater, the salt inhibition kinetics in biological treatment of saline wastewater was investigated by using a sequence activated sludge unit. In order to obtain baseline information, initial experiments were performed with fresh wastewater. Experiments with 10~30 g/L salt concentration were then done to investigate the system performance and salt inhibition effects on kinetic constants. The results indicated that salt inhibition was non-competitive model affecting both the maximum rate and the saturation constants. Salt inhibition constants were determined by experimental data as K Y 2333 mg/L.The rate equations under different salt concentration conditions were further determined by experimental data.