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...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.展开更多
Degradation of low-concentration p-nitrophenol(p-NP)aqueous solution was carried out in 254/185 nm photolysis.The effects of Mn^(2+),pH value,O_2 and O_3 on the degradation efficiency have been investigated.It was obs...Degradation of low-concentration p-nitrophenol(p-NP)aqueous solution was carried out in 254/185 nm photolysis.The effects of Mn^(2+),pH value,O_2 and O_3 on the degradation efficiency have been investigated.It was observed that the singlet oxygen scavenger Mn^(2+)did not affect the degradation of p-NP.In acidic and alkaline solutions,the degradation efficiency was enhanced in comparison to that in neutral solution.The presence of O_2 dramatically promoted the degradation of p-NP,while that of O_3 impeded it.展开更多
文摘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.
文摘Degradation of low-concentration p-nitrophenol(p-NP)aqueous solution was carried out in 254/185 nm photolysis.The effects of Mn^(2+),pH value,O_2 and O_3 on the degradation efficiency have been investigated.It was observed that the singlet oxygen scavenger Mn^(2+)did not affect the degradation of p-NP.In acidic and alkaline solutions,the degradation efficiency was enhanced in comparison to that in neutral solution.The presence of O_2 dramatically promoted the degradation of p-NP,while that of O_3 impeded it.
