Sludge concentration subarea(A area and B area) is realized by mesh filter unit,solving the higher sludge concentration process problem of MBR system under zero excess sludge discharge conditions.Mass balance of the s...Sludge concentration subarea(A area and B area) is realized by mesh filter unit,solving the higher sludge concentration process problem of MBR system under zero excess sludge discharge conditions.Mass balance of the system is processed,and variety disciplinarians of VSS of A area and B area are analyzed.The results show that XA decreases while HRTA increases.XB decreases while R increases,and ascends as VSS(XA,B) of mesh effluent increases.When XB is a fixed value,XA,B increases as R does and XA decreases slowly while R increases,which theoretically proves the feasibility of the technique.展开更多
This study mainly focused on the occurrence of pharmaceutical and personal care products(PPCPs)in sewage dewatered sludge and their discharges through sludge disposal from wastewater treatment plants(WWTPs).The data w...This study mainly focused on the occurrence of pharmaceutical and personal care products(PPCPs)in sewage dewatered sludge and their discharges through sludge disposal from wastewater treatment plants(WWTPs).The data were obtained and calculated from seven PPCPs in dewatered sludge collected from 12WWTPs in two typical cities,Beijing and Shenzhen in China.Four of seven PPCPs,diclofenac acid,carbamazepine,mefenamic acid and N,N-diethyl-m-toluamide were detectable in dewatered sludge from Beijing and Shenzhen with concentration up to 4240,11,060,92 and 219μg/kg respectively.While,the other three compounds,trimethoprim,chloramphenicol and bezafibrate were not detected in collected samples from these two cities.The highest discharge of diclofenac acid and carbamazepine were 1023 g/d and 494 g/d respectively.In addition,the total discharge of these four detected PPCPs from each plant ranged from 5 to 1092 g/d in Beijing and 4e497 g/d in Shenzhen.Thus,PPCP discharge through sludge disposal cannot be neglected,and further research on transfer of PPCPs during sludge disposal onto agriculture land and influence of sludge application is required and essential.展开更多
Wastewater from the spray absorption treatment of sludge drying gas is a kind of refractory wastewater with poor biodegradability.In this study,the free radicals generated from the double dielectric barrier were innov...Wastewater from the spray absorption treatment of sludge drying gas is a kind of refractory wastewater with poor biodegradability.In this study,the free radicals generated from the double dielectric barrier were innovatively used for the degradation of simulated spray wastewater.The effects of residence time,input power,initial pH,aeration rate,and discharge area on the degradation rate and COD(chemical oxygen demand)removal rate were investigated.The optimal conditions were as follows:residence time=120 min,input power=170.0 W,initial pH=5.54,aeration rate=0.9 mL/min,discharge area=10.8 cm^(2),and the initial concentrations of NH_(3),H_(2)S,methanethiol,trimethylamine,benzene and toluene were 250,250,50,50,50 and 100 mg/L,respectively.Meanwhile,it was also found that hydroxyl radical(⋅OH)played an important role in the degradation process.展开更多
文摘Sludge concentration subarea(A area and B area) is realized by mesh filter unit,solving the higher sludge concentration process problem of MBR system under zero excess sludge discharge conditions.Mass balance of the system is processed,and variety disciplinarians of VSS of A area and B area are analyzed.The results show that XA decreases while HRTA increases.XB decreases while R increases,and ascends as VSS(XA,B) of mesh effluent increases.When XB is a fixed value,XA,B increases as R does and XA decreases slowly while R increases,which theoretically proves the feasibility of the technique.
基金supported by Tsinghua University e Veolia Environment Joint Research Center for Advanced Environment Technology and the Program for Changjiang Scholars and Innovative Research Team in University(IRT1261).
文摘This study mainly focused on the occurrence of pharmaceutical and personal care products(PPCPs)in sewage dewatered sludge and their discharges through sludge disposal from wastewater treatment plants(WWTPs).The data were obtained and calculated from seven PPCPs in dewatered sludge collected from 12WWTPs in two typical cities,Beijing and Shenzhen in China.Four of seven PPCPs,diclofenac acid,carbamazepine,mefenamic acid and N,N-diethyl-m-toluamide were detectable in dewatered sludge from Beijing and Shenzhen with concentration up to 4240,11,060,92 and 219μg/kg respectively.While,the other three compounds,trimethoprim,chloramphenicol and bezafibrate were not detected in collected samples from these two cities.The highest discharge of diclofenac acid and carbamazepine were 1023 g/d and 494 g/d respectively.In addition,the total discharge of these four detected PPCPs from each plant ranged from 5 to 1092 g/d in Beijing and 4e497 g/d in Shenzhen.Thus,PPCP discharge through sludge disposal cannot be neglected,and further research on transfer of PPCPs during sludge disposal onto agriculture land and influence of sludge application is required and essential.
基金supported by the National Natural Science Foundation of China(No.61871409)Zhejiang Natural Science Foundation of China(No.LZ20F010001).
文摘Wastewater from the spray absorption treatment of sludge drying gas is a kind of refractory wastewater with poor biodegradability.In this study,the free radicals generated from the double dielectric barrier were innovatively used for the degradation of simulated spray wastewater.The effects of residence time,input power,initial pH,aeration rate,and discharge area on the degradation rate and COD(chemical oxygen demand)removal rate were investigated.The optimal conditions were as follows:residence time=120 min,input power=170.0 W,initial pH=5.54,aeration rate=0.9 mL/min,discharge area=10.8 cm^(2),and the initial concentrations of NH_(3),H_(2)S,methanethiol,trimethylamine,benzene and toluene were 250,250,50,50,50 and 100 mg/L,respectively.Meanwhile,it was also found that hydroxyl radical(⋅OH)played an important role in the degradation process.
