不同工况蚯蚓人工湿地表层污泥处理效果  

Treatment Effects of Earthworm Constructed Wetlands in Different Working Conditions

作　　者：董梦珂 李怀正[1] 徐一啸 DONG Meng-ke LI Huai-zheng XU Yi-xiao(College of Environmental Science and Engineering, Tongji University,Shanghai 200092, Chin)

机构地区：[1]同济大学环境科学与工程学院,上海200092

出　　处：《环境科学》2017年第3期1159-1166,共8页Environmental Science

基　　金：国家水体污染控制与治理科技重大专项(2013ZX07312-001-005)

摘　　要：通过在传统污泥干化湿地中投加蚯蚓,研究了蚯蚓人工湿地处理污泥技术的可操作性;同时研究了不同污泥负荷48、65、80 kg·(m^2·a)^(-1)、不同蚯蚓投放密度0、0.43、0.54、0.65 kg·m^(-2)以及不同进泥频率等工况条件下,该模拟湿地装置表层污泥的脱水和稳定化效果.结果表明,通过设置入土深度为10 mm的挡板,能够提供蚯蚓在进泥期间的栖身之所,保证蚯蚓湿地的正常运行;蚯蚓的加入能够显著改善人工湿地污泥干化和稳定化的效能,使表层污泥脱氢酶活性(dehydrogenase activity,DHA)更低,含水率和VS分别下降了15%和10%左右,并且在0.65 kg·m^(-2)的蚯蚓投放密度下,蚯蚓人工湿地的稳定化效果最好.随着污泥负荷的增加以及进泥频率的降低,蚯蚓人工湿地运行效能会变差.The feasibility of a new sludge treatment technology of earthworm constructed wetlands was tested by adding earthworm into the traditional sludge dying reed beds. The dewatering and stabilization effects of the upper layer sludge were tested under different sludge loading rates of 48,65,80 kg·（ m2·a）（-1）,different earthworm stocking densities of 0,0. 43,0. 54,0. 65 kg·m（-2）and different sludge loading frequencies. The results indicated that it was feasible to provide a shelter for earthworm during the loading period by setting a damper with a buried depth of 10 mm. The addition of earthworm could effectively improve the dewatering and stabilization effects of earthworm constructed wetlands,by lowering the DHA and decreasing the moisture content and VS of sludge by 15% and10% respectively. The stabilization effects of earthworm constructed wetlands reached the best under the stocking density of 0. 65kg·m（-2）. With the increase of sludge loading rate and decrease of loading frequency,the running efficiency of earthworm constructed wetlands would be worse.

关 键 词：人工湿地 污泥干化床 蚯蚓 污泥脱水 污泥稳定化 

分 类 号：X705[环境科学与工程—环境工程]