SBR工艺处理高含盐生活污水的研究

针对海水利用产生的高含盐生活污水,试验采SBR工艺分别研究了不同海水比例的污水中低浓度和中浓度有机物的降解和去除规律、污泥沉降性能以及温度对含20%海水的污水中有机物降解速率的影响.试验结果表明,在高盐污水的生物处理系统中,污泥的驯化是关键的一步.海水盐度降低了有机物的降解速率和去除率,但两种浓度污水的出水CODcr浓度均在30～70mg/L之间,远远低于国家污水综合排放二级标准(GB8978-1996).海水盐度使污泥体积指数降低,污泥沉降速度加快.污水处理有机物的适宜温度是20℃左右.

Study on the Treatment of High Salinity Domestic Wastewater by Using SBR Process

This study was initiated to treat high salinity domestic wastewater resulting from use of seawater by SBR process.Experiments were conducted under different seawater salinity conditions to investigate such as the rule of low and middle concentration organics degrading velocity and removal,activated sludge settling characteristics and effect of the temperature on organics degrading velocity when seawater was 20% of the total domestic wastewater.Results showed that the acclimation of the activated sludge was very important and though high seawater salinity decreased organics degrading velocity and removal efficiency,the CODcr of the effluent was between 30~70 mg/L,which was far below the second class standard in National Integrated Wastewater Discharge Standard(GB8978-1996).And when seawater salinity increased,the Sludge Volume Index(SVI) de-creased and the settling velocity became faster.