With phenanthrene and pyreneas as test pollutants,four control factors(inoculation amount,water soil ratio, air flux and temperature) were selected to study the microbiology degradation control of PAHs in bio slurry r...With phenanthrene and pyreneas as test pollutants,four control factors(inoculation amount,water soil ratio, air flux and temperature) were selected to study the microbiology degradation control of PAHs in bio slurry reactor.Results indicated that at the test concetration the optimum parameters for obtaining the maximum degradation rates for phenanthrene and pyrenene are 5%～10% in incubation amount,2∶1 for water/soil ratio,0 06～0 1m 3·h -1 for air,and 30℃ in temperature,degradation rate was the highest in this condition with the values 98 9% and 84 2% phenanthrene and pyrnene respectively on the 15th day.These parameters provide useful basis for large scale engineering to treat soil PAHs by means of bio slurry reactor.展开更多
To investigate the effects of ozonation on minimizing the excess sludge and enhancing the nitrogen removal in an effluent, batch and continuous experiments in two MBRs with and without sludge ozonation （ namely combi...To investigate the effects of ozonation on minimizing the excess sludge and enhancing the nitrogen removal in an effluent, batch and continuous experiments in two MBRs with and without sludge ozonation （ namely combined and reference run） were carried out. Through ozonation at a dose of 0. 16 mg O3/mg MLVSS, 53.1% of the treated MLVSS was solubilized, and soluble SCOD/TN ratio of ozonized sludge （OS） was about 8. 6 due to the release of cellular nitrogen-contained materials and SCOD loss by ozone mineralization. In addition, the results of batch nitrification and denitrification tests with OS supernatant indicated that solubilized sludge could act as a reducing power for denitrification and a nitrogen source for nitrification. 40-day operation of-two MBR systems demonstrated that the recirculation of OS into a bioreaetor enabled the combined system have two advantages over the control one. The observed sludge yield （Yobs） was decreased from 0. 13 to 0. 06g MLSS/g COD, while the nitrogen removal was increased from 64. 6% to 72. 3%. And sludge ozonation elevated the inorganic fraction of MLSS, but did not impact sludge activities.展开更多
文摘With phenanthrene and pyreneas as test pollutants,four control factors(inoculation amount,water soil ratio, air flux and temperature) were selected to study the microbiology degradation control of PAHs in bio slurry reactor.Results indicated that at the test concetration the optimum parameters for obtaining the maximum degradation rates for phenanthrene and pyrenene are 5%～10% in incubation amount,2∶1 for water/soil ratio,0 06～0 1m 3·h -1 for air,and 30℃ in temperature,degradation rate was the highest in this condition with the values 98 9% and 84 2% phenanthrene and pyrnene respectively on the 15th day.These parameters provide useful basis for large scale engineering to treat soil PAHs by means of bio slurry reactor.
文摘To investigate the effects of ozonation on minimizing the excess sludge and enhancing the nitrogen removal in an effluent, batch and continuous experiments in two MBRs with and without sludge ozonation （ namely combined and reference run） were carried out. Through ozonation at a dose of 0. 16 mg O3/mg MLVSS, 53.1% of the treated MLVSS was solubilized, and soluble SCOD/TN ratio of ozonized sludge （OS） was about 8. 6 due to the release of cellular nitrogen-contained materials and SCOD loss by ozone mineralization. In addition, the results of batch nitrification and denitrification tests with OS supernatant indicated that solubilized sludge could act as a reducing power for denitrification and a nitrogen source for nitrification. 40-day operation of-two MBR systems demonstrated that the recirculation of OS into a bioreaetor enabled the combined system have two advantages over the control one. The observed sludge yield （Yobs） was decreased from 0. 13 to 0. 06g MLSS/g COD, while the nitrogen removal was increased from 64. 6% to 72. 3%. And sludge ozonation elevated the inorganic fraction of MLSS, but did not impact sludge activities.
