Fe^(2+)激活过一硫酸盐调理剩余污泥的研究

Conditioning of Excess Sludge by Fe^(2+) Activated Peroxymonosulfate

以浓缩池污泥为研究对象,采用Fe^(2+)激活过一硫酸盐(HSO_5^-,PMS)氧化法调理剩余污泥。研究了Fe^(2+)与PMS的摩尔比,PMS投加量,初始pH值,Fe^(2+)的投加方式以及温度对污泥脱水性能的影响。研究结果表明:对污泥比阻(SRF)降低率影响顺序由大到小依次为:PMS投加量,pH值,n(Fe^(2+))/n(HSO_5^-)摩尔比;污泥脱水性能的最佳条件:温度25℃,Fe^(2+)与HSO_5^-的摩尔比为1∶1,PMS投加量为1.2mmol/g TS,pH不调节,Fe^(2+)一次投加,在此条件下污泥比阻降低率达到90.98%.对Fe^(2+)激活过一硫酸盐氧化法调理前后污泥的胞外聚合物(EPS)采用三维荧光光谱图进行分析,结果表明:污泥脱水性能的提高与LB-EPS(松散型)和TB-EPS(紧密型)相关,部分LB-EPS和TB-EPS被Fe^(2+)激活PMS氧化降解,释放出大量的结合水,从而提高了污泥的脱水性能。

In this study, the sludge from the sludge concentration tank was used as the research object, and the excess sludge was conditioned by the Fe^2+ activated peroxymonosulfate (HSO5^- PMS) oxidation method. Studied were the effects of Fe^2+/PMS molar ratio, PMS dosage, initial pH, Fe^2+ addition method and temperature on sludge dewatering performance. The results show that the influence degree of each factor on the reduction rate of SRF was: PMS dosage>pH value>Fe^2+/HSO5^- molar ratio;The best conditions for sludge dewatering performance:temperature 25 ℃, n (Fe^2+)/ n (HSO5^-) molar ratio 1∶1, PMS concentration 1.2 mmol/g TSS, pH not adjusted, and Fe^2+ added once. Under these conditions the specific resistance of sludge was reduced by 90.98 %. The EPS of the sludge before and after conditioning was analyzed by three-dimensional fluorescence spectrometry. The improvement of sludge dewatering performance was related to LB-EPS and TB-EPS. And some LB-EPS and TB-EPS were oxidatively degraded by Fe^2+-activated PMS, releasing a large amount of bound water, thus improving the sludge dewatering performance.