厌氧颗粒污泥对五氯苯酚的吸附、解吸和生物降解研究

A Study on Adsorption,Desorption and Biodegradation of Pentachlorophenol by Anaerobic Granular Sludge

在以氯苯酚驯化污泥接种的上流式厌氧反应器中可形成降解ＰＣＰ的厌氧颗粒污泥。在ＨＲＴ２０－２２ｈ、ＰＣＰ负荷率２００－２２０ｍｇ／（Ｌ·ｄ）时，该反应器可有效地处理合ＰＣＰ１７０－１８０ｍｇ／Ｌ的废水，ＰＣＰ去除率大于９９．５％。ＰＣＰ在厌氧颗粒污泥上的吸附和解吸均符合Ｐｒｅｕｎｄｌｉｃｈ等温方程，吸附是部分不可逆的，该方程可较好地描述厌氧反应器内颗粒污泥对ＰＣＰ的吸附量的变化规律。试验表明厌氧颗粒污泥去除ＰＣＰ的主要机制是生物降解，而非吸附和挥发作用。

PCP degrading anaerobic sludge granules may be developed in upflow anaerobic digestion reactors(UAD) seeded with sludges acclimated to chlorophenols,the reactors are able to remove more than 99.5 % of PCP in a synthetic wastewater at the concentration of 170 to 180 mg/L,volumetric loading rate up to 200 to 220 mg/(L.d),and hydraulic retention time of 20 to 22 hours.Biosorption and desorption isotherms of pentachlorophenol were determined,and the data were fitted to Freundlich equation.However,it was found that the biosorption of PCP was partly irreversible,and the Freundlich models with empirical constants determined from this study can quite well describe the partition behavior of pentachlorophenol in anaerobic upflow digestion reactor.It was demonstrated that PCP removal by granular sludge in UAD reactors was due to biodegradation rather than adsorption and volatilization.