【作者】 王薇；

【导师】 杨昌柱；

【作者基本信息】 华中科技大学 ， 环境科学， 2007， 硕士

【摘要】 本文将粉末活性炭（PAC）技术与动态膜生物反应器（DMBR）相结合,应用于处理生活污水。研究了DMBR与PAC-DMBR对污染物去除效果,并对其进行了对比,分析了PAC-DMBR系统中的膜通透性、PAC投加量对污染物去除效果的影响、PAC的使用周期以及PAC-DMBR的抗冲击性。试验结果表明:在HRT为8.5小时,MLSS为4500mg/L,平均温度为29℃条件下,PAC-DMBR较单一的DMBR对COD和NH₃-N的平均去除率分别提高了11.3%和3.3%,且PAC-DMBR系统的出水浊度低达0.99NTU。通过测得不同出水水头下的膜通量,并通过二次曲线拟合的值计算出清水透过、连续过滤24h后动态膜片以及投加粉末活性炭过滤24h后动态膜片的过滤阻力,并分析阻力值之间的关系,可知投加粉末活性炭之后,在一定程度上是加速了动态膜的形成,而且PAC产生的过滤阻力在动态膜过滤总阻力中占绝大部分比重。PAC投加量对于COD、NH₃-N去除效果的影响较大,对于浊度的影响并不显著,在PAC投加量为0.8g/L时,COD、NH₃-N去除效果最好,在PAC投加量为1.2g/L时,COD、NH₃-N去除效果最差,故选PAC投加量为0.8g/L为本系统最佳的投加量。通过监测PAC-DMBR系统中COD浓度变化,推断出粉末活性炭的作用在PAC-DMBR系统中主要分为三个阶段:粉末活性炭加速有机物降解的过程、活性炭与微生物形成生物活性炭和活性炭吸附饱和阶段。在初始流量为0.87L/h条件下,按照2倍、4倍、6倍、8倍于初始流量各冲击一小时来判断系统的抗流量冲击的能力,在流量保持为0.87L/h的条件下,再分别调整进水COD浓度为341.2mg/L、526.5mg/L、791.7mg/L各冲击一小时来判断系统的抗浓度冲击的能力。结果表明,系统具有很好的抗流量冲击性和抗浓度冲击性。更多还原

【Abstract】 In the study, the process based on Powdered Activated Carbon （PAC） combined with Dynamic Membrane Bioreactor was developed for domestic wastewater treatment. The pollutant removal rates of the DMBR and PAC-DMBR were studied respectively, and the efficiency both of which was compared. Furthermore, for the PAC-DMBR, the filterability of dynamic membrane, Powdered Activated Carbon dosage, PAC’s reuse cycle and the ability of anti-shock were analyzed.The experimental results showed that the removal rates of COD and NH₃-N in the PAC-DMBR had been raised 11.3% and 3.3% respectively more than those of DMBR. When the HRT was 8.5h, MLSS was 4500 mg/L and the average temperature was 29℃, the concentration of turbidity in effluent could be as low as 0.99NTU in the PAC-DMBR. Measured the fluxs by changing the effluent head drop, and calculated the filtration resistance of tap water, the wastewater after 24 hours consecutive filtration and the wastewater which was 24 hours consecutive filtration after addition of powdered activated carbon to the DMBR by the values of the second curve fitting. Then the relationship of the filtration resistance was analyzed. The results showed that the addition of powdered activated carbon to the DMBR could accelerate the dynamic membrane formation in a certain extent, and the filtration resistance of PAC accounted for the majority of the total filtration resistance. The PAC dosage affected the removal rate of COD and NH₃-N greatly, but the affect to the turbidity was not notable. When the PAC dosage is 0.8g/L, the removal rates of COD and NH₃-N showed the best results. When the PAC dosage is 1.2g/L, the results of removal rate of COD and NH₃-N was the worst. So the best PAC dosage was 0.8g/L in this system. By monitoring COD concentration in the PAC-DMBR, it was concluded that the action of PAC could be divided into three parts in the PAC-DMBR: the process that PAC accelerated the organic compound degradation, the process that PAC and Activated Sludge were formed to be Biological Activated Carbon （BAC） and the process that PAC adsorption was saturated. when the initial flow was 0.87L/h, the system was shocked by the flow of two times, four times, six times and eight times to the initial flow respectively for one hour to judge the system’s ability to flow resistance. Then with the flow of 0.87L/h, the COD concentration in the influent was adjusted to 341.2 mg/L, 526.5 mg/L and 791.7 mg/L respectively for judging the system’s concentration resistance. The results showed that the system had good ability to the flow resistance and concentration resistance.更多还原