MBCR组合工艺特点及中试运行效果分析

Characteristics of MBCR Combined Processes and Effect Analysis of Pilot Operation

移动床陶瓷膜生物反应器(MBCR)是移动床生物膜反应器(MBBR)与纳米陶瓷平板膜(CFM)膜池组合而成的一种特殊的膜生物反应器(MBR)工艺。文章主要阐述了MBCR工艺的设计要点、运行特点,以及针对生活污水常规生化指标进行的中试效果和CFM陶瓷平板膜通量影响因素分析。试验结果表明,MBCR组合工艺由于其自身独特的设计特点,以生活污水作为原水时,水温为11.5℃下,对COD_(Cr)、氮、磷的去除效果良好。MBCR组合工艺对污水COD_(Cr)的去除率为93%,出水质量浓度低至35 mg/L;总氮去除率为75%,出水质量浓度低至10 mg/L;总磷去除率为70%;中试装置设计污泥龄为23 d,剩余污泥可部分完成自身降解,基本不产污泥。工艺可在较低污泥负荷下运行,实际核算污泥负荷为0.08 kg BOD_(5)/(kg MLSS·d)。生化处理出水由于经CFM膜过滤,SS质量浓度可低至0.1 mg/L以下。膜通量试验结果表明,在8 000~10 000 mg/L的污泥质量浓度下,CFM膜通量基本可以维持在35~45 L/(m^(2)·h),较其他有机膜通量有较大优势。

MBCR is a special MBR process which combines moving bed biofilm reactor(MBBR) and ceramic flat membrane(CFM). In this paper, the design points and operation characteristics of MBCR process, the pilot-scale effect of conventional biochemical indicators of domestic sewage and the influencing factors of CFM ceramic flat membrane flux were described. Results showed that combined MBCR process had good removal effect on COD_(Cr), nitrogen and phosphorus on domestic sewage under 11.5 ℃ due to its unique design characteristics. The removal rate of COD_(Cr)by MBCR was 93%, effluent mass concentration was 35 mg/L;the removal rate of total nitrogen was 75%, effluent mass concentration was 10 mg/L;the removal rate of total phosphorus was 70%;the designed sludge age of pilot plant was 23 d, some of which can be partially degraded, and basically no production. Process can be operated under a lower sludge load, actual accounting sludge load was 0.08 kg BOD_(5)/(kg MLSS·d). Effluent of biochemical treatment was filtered by CFM membrane. The mass concentration of SS could be 0.1 mg/L. At the same time, the experimental results of membrane flux showed that under the sludge mass concentration of 8 000~10 000 mg/L, CFM membrane flux could be maintained at 35~45 L/(m^(2)·h), which was superior to other organic membrane flux.