工业有机废水为共基质培养降解五氯酚厌氧颗粒污泥

研究了工业有机废水和五氯酚(PCP)共存条件下,改良UASB反应器中厌氧污泥的颗粒化过程.实验发现降解PCP厌氧颗粒污泥形成可分成污泥驯化、颗粒污泥出现与成熟3个阶段,污泥颗粒化过程中污泥量、污泥活性和厌氧消化3大类群细菌数量与生态分布发生特征性变化,所培养颗粒污泥具有脱氯降解PCP的活性,产甲烷优势菌为杆状或长丝状产甲烷丝菌,在生物结构上形成互营微菌落,但污泥颗粒无明显层次性微结构.作为共基质的有机废水其种类影响着颗粒化进程、颗粒污泥脱氯活性与产甲烷优势菌.

The Granulation of PCP-Degrading Anaerobic Sludge with Industrial Organic Wastewater as Co-substrate

The granulation of PCP degrading anaerobic sludge in two improved UASB reactors under co-existence of two types of industrial wastewater and PCP were studied. It was found that the granulation of PCP degrading anaerobic sludge could be divided into three stages, i.e. sludge acclimation, granular pre-formation and granular maturation. The changes in biomass, sludge bioactivity, population and ecological distribution of three group bacteria involved in anaerobic digestion during the course of granulation were also examined. Anaerobic granules from two reactors showed high dechlorination activity at meta,otho and para position. Rod-shaped and filamentous shaped Methanosaeta-like spp. were found in anaerobic granules. Results of electron microscopy revealed the presence of synthophic microcolonies and non-layed microstructure in PCP-degrading granules. The types of industrial wastewater used as co-substrate had affected the course of sludge granulation, dechlorinating activity and predominant methanogens in PCP-degrading anaerobic granules.