pH值对微氧磁性活性污泥系统处理含五氯酚废水的影响

The Effect of pH Value on Treatment of PCP by Micro-aerobic Magnetic Activated Sludge

中文关键词:  微氧  磁性  活性污泥  pH值  五氯酚

Key Words:micro-aerobic  magnetic field  activated sludge  pH value  pentachlorophenol

中文摘要:

      研究了pH值对微氧磁性活性污泥系统处理五氯酚(PCP)废水的影响,并以微氧活性污泥系统作为对照,考察了不同pH值下PCP和CODCr去除率、微生物活性以及污泥理化特性的变化。结果表明,与微氧活性污泥系统相比,pH值在5.0～9.0范围内,微氧磁性活性污泥系统的PCP和CODCr去除率均较高,且微氧磁性活性污泥系统和微氧活性污泥系统均在pH值为7时PCP和CODCr的去除率达到最大,分别为87.5%和70.5%、77.0%和67.0%。由于磁粉的存在,微氧磁性活性污泥系统中微生物活性和絮凝性能均得到增强,当pH值为7时,微氧磁性活性污泥系统中脱氢酶浓度和胞外多聚物中蛋白质与多糖质量比(PN/PS)分别达到248.59 mg/g和1.3,而微氧活性污泥系统中这两个指标分别为173.18 mg/g和0.76。

Abstract:

      The effect of pH value on the treatment of pentachlorophenol (PCP) by magnetic activated sludge in the presence of low concentration of dissolved oxygen (DO, 0.6 mg/L) was studied,and the sludge without magnetic was as blank control. The effects of pH value on the removal rate of PCP and CODCr, the microbial activity and flocculation performance of the activated sludge system were studied. The experimental results showed that the treatment effect of micro-aerobic magnetic activated sludge on PCP and CODCr was higher than that of micro-aerobic activated sludge, especially when the pH value was 5.0～9.0. The removal rate of PCP and CODCr reached maximum when the pH value was 7.0. For micro-aerobic magnetic activated sludge and micro-aerobic activated sludge, the removal rates of PCP reached 87.5% and 70.5% and removal rates of CODCr reached 77.0% and 67.0%, respectively.Due to the presence of the micro-magnetic field, the microbial activity and flocculation performance of the activated sludge system were enhanced. When pH value was 7.0, the concentrations of dehydrogenase and extracellular polymeric substance （PN/PS）in the micro-aerobic magnetic activated sludge system were 248.59 mg/g sludge and 1.3, respectively and the values were 173.18 mg/g and 0.76 in the micro-aerobic activated sludge.