曝气强度对蠕虫捕食污泥过程的影响  

Effect of aeration intensity on the process of sludge predation by worms

作　　者：张晓琦[1,2] 田禹[1,2] 王强[3] 

机构地区：[1]哈尔滨工业大学城市水资源与水环境国家重点实验室,黑龙江哈尔滨150090 [2]哈尔滨工业大学市政环境工程学院,黑龙江哈尔滨150090 [3]黑龙江省环境保护科学研究院,黑龙江哈尔滨150056

出　　处：《中国环境科学》2014年第2期345-351,共7页China Environmental Science

基　　金：城市水资源与水环境国家重点实验室基金(2011DX01);国家创新研究群体科学基金(51121062)

摘　　要：利用寡毛纲蠕虫一水丝蚓（Limnodrilussp．）的捕食实现污泥量的削减，并针对曝气强度对蠕虫捕食污泥过程的影响，考察了不同的曝气强度所引起的蠕虫活性、泥水性质和污泥减量效能等的变化．结果表明：蠕虫对曝气强度的耐受能力有限．其受损程度与曝气强度和时间正相关，低强度的间歇曝气下蠕虫受损数量较低，为总数的1．7％蠕虫的组织乳酸脱氢酶活力在2．8～9．5m。／（m2．h）的曝气强度下明显升高，表现了较高的物质代谢和能量消耗水平．较低的曝气强度下污泥上清液中硝酸盐氮的累积较轻．蠕虫对污泥的捕食能够抑制低曝气强度下溶氧缺乏所引起的污泥容积指数（SVI）增加，改善污泥的沉降性．在2．8m。／（m2．h）的间歇曝气下，污泥减量效率比连续曝气的污泥减量效率更稳定．Sludge reduction can be achieved through the predation by oligochaeta worm-Limnodrilus sp.. To analyze the effect of aeration intensity on the process of sludge predation, changes in worm activity, sludge properties and sludge reduction efficiency under different intensities of aeration were investigated. The results showed that these worms had limited tolerance to aeration intensity. The number of injured worms increased with the increasing aeration intensity and retention time in sludge, and fewer injured individuals （1.7% of the total）was found under the mild intermittent aeration. The lactate dehydrogenate activity of worms was higher under the aeration intensity of 2.8-9.5m3/（m2h）, which may imply the higher level of material metabolism and energetic consumption of the worms at those aeration conditions. Less nitrate accumulation was found in the supematant of sludge during the predation under the lower aeration intensity, and the increase in sludge volume index （SVI） caused by lack of dissolved oxygen was restrained by the worms, showing their performance for improving sludge settling. The sludge reduction of worms for the intermittent aeration of 2.8m3/（m2h） was more stable than those for continuous aerations.

关 键 词：曝气 蠕虫 捕食 污泥减量 污泥容积指数 脱氮 

分 类 号：X703.5[环境科学与工程—环境工程]