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A~2/O+MBR工艺特性及其膜污染控制研究
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摘要
分别对MBR和A2/O+MBR法处理生活污水的工艺特性及其膜污染控制进行了研究,结果表明:MBR工艺的NH3-N去除效果最佳时MLSS为8.83-9.05g/L;A2/O+MBR工艺的出水NH3-N低于1.35mg/L,去除率高达91.04%;两种工艺的CODcr、BOD5、浊度的去除率均达90%以上,出水优于国家回用标准;MBR系统的启动过程中的污泥形态及生物相的变化与活性污泥法一致;通过SEM可以从膜丝的微观结构上解释了三种膜的机械强度、通量及抗污染性能差异的根本原因;膜清洗最佳方案为:在线清洗为碱洗+酸洗+水力反冲,体外清洗为碱洗+酸洗;现场试验验证了中试的运行特性及膜清洗技术效果,提出了以NH3-N与MLSS两指标监测MBR系统的启动及运行情况,定期排泥、在线清洗与体外清洗相结合可维护MBR长期稳定运行。
The properties of two pilot-plant scales of MBR precess with A2/O combined MBR process on the treatment of domestic wastewater and control of membrane fouling were studied, Results showed that under the range of MLSS from 8.83g/L to 9.05g/L, the effect of removal of NH3-N was the best in MBR process;However, the NH3-N of effluent was lower than 1.35mg/L and the rate of removal of it reached 91.04% in A2/O combined MBR process;The rates of removal of CODcr、BOD5 and turbidity in the two process were all amont to 90%,the quality of effluent excelled the the standard of reuse water of country; The change of biofacies and properties of sludge was similar to conventional activated sludge process; Basic reason about performance difference of the three kind of membranes'mechanical strengths, the flux and the anti-pollution might be explained through SEM from the membrane silk microscopic structure; The effect of membrane submerged in alkaline solution and then in acid solution was better than that of other cleaning methods; The best technique to control fouling on-line was alkaline clean and then acid clean with dynamic bounce-back; The properties of MBR and effects of membrane fouling cleaning in pilot-plant scale were testified in industrial experiment, the two indicators of NH3-N and MLSS were applied in monitoring the state of start-up and long-term running of industrial MBR system,the sludge discharge periodically and cleaning on-line combined submerged cleaning in long-term running management were recommended.
引文
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