Treatment of municipal sewage sludge by electron beam irradiation  

作　　者：CAO Changqing WANG Min 

机构地区：[1]Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China

出　　处：《Nuclear Science and Techniques》2012年第1期29-33,共5页核技术（英文）

摘　　要：Irradiation treatment of sewage sludge was carried out using an electron beam accelerator.The effects of irradiation dose,sludge water content and sludge thickness on the breakdown of sludge flocs,thus the formulation of soluble chemical oxygen demand (SCOD) and soluble total nitrogen (STN),and the reduction of MLSS and endogenous OUR,and so on,were investigated.It was observed that,with increased doses,the SCOD,STN and UV absorption intensity of the sludge supernatant increased rapidly with similar trends,and MLSS considerably decreased,all indicating that a large amount of the cell contents of sewage sludge were released by electron beam irradiation.The results of endogenous OUR also showed that a large number of microorganisms in sewage sludge were killed or deactivated.Zeta potential sludge became more positive with increased doses,implying that the dewatering performance of sewage sludge was not adversely affected.It was also found that the thickness of sludge was an operation parameter of great importance in the electron beam treatment of sewage sludge due to the relatively short penetration depth in water/sludge of the high-energy electrons.Irradiation treatment of sewage sludge was carried out using an electron beam accelerator. The effects of irradiation dose, sludge water content and sludge thickness on the breakdown of sludge flocs, thus the formulation of soluble chemical oxygen demand （SCOD） and soluble total nitrogen （STN） , and the reduction of MLSS andendogenous OUR, and so on, were investigated. It was observed that, with increased doses, the SCOD, STN and UV absorption intensity of the sludge supernatant increased rapidly with similar trends, and MLSS considerably decreased,all indicating that a large amount of the cell contents of sewage sludge were released by electron beam irradiation. The results of endogenous OUR also showed that a large number of microorganisms in sewage sludge were killed ordeactivated. Zeta potential sludge became more positive with increased doses, implying that the dewatering performance of sewage sludge was not adversely affected. It was also found that the thickness of sludge was an operation parameter of great importance in the electron beam treatment of sewage sludge due to the relatively short penetration depth in water/sludge of the high-energy electrons.

关 键 词：城市污水污泥 电子束照射 电子束加速器 ZETA电位 淤泥厚度 化学需氧量 电子束处理 污泥处理 

分 类 号：X703[环境科学与工程—环境工程] TS195.6[轻工技术与工程—纺织化学与染整工程]