High salinity industrial wastewater is difficult to treat using biological treatment system because of the high concentrations of salt.The potential of a sequencing batch biofilm reactor(SBBR)process in treating synth...High salinity industrial wastewater is difficult to treat using biological treatment system because of the high concentrations of salt.The potential of a sequencing batch biofilm reactor(SBBR)process in treating synthetic high salinity wastewater was evaluated at laboratory scale during a 110-day operation.The reactor was operated in a 12 h cycle,and each cycle consisted of 0.25 h influent addition,8 h aeration,3 h anoxic reaction,0.5 h sedimentation and 0.25 h effluent withdrawal.Gradual increase in salinity gradient was applied during the acclimatization period.The acclimated SBBR system was demonstrated to be an effective process to remove organic compounds and ammonia nitrogen under high salinity conditions with chemical oxygen demand(COD)and ammonia nitrogen(NH3-N)removal efficiencies of 88% and 80%,respectively.The microscopic examination indicated that rather than rotifers or vorticella,the zoogloea,filamentous fungus mingled with a small quantity of swimming infusorians were dominant bacteria in SBBR system.The removal efficiencies close to 80% in COD and 75% in NH3-N were achieved at an organic loading rate(OLR)of 0.96 kg COD/(m3·d),pH of 7.0,salinity of 14 g/L and NH3-N of 30 mg/L.展开更多
The stability of performance of anaerobic ammonium oxidation (ANAMMOX) reactors was studied and the indices of performance stability were compared.The results showed that under different types of shock load, the react...The stability of performance of anaerobic ammonium oxidation (ANAMMOX) reactors was studied and the indices of performance stability were compared.The results showed that under different types of shock load, the reactors with different configurations displayed different stability.The biofilm reactor stood first in stability towards substrate shock load, followed by anaerobic sequencing batch reactor (SBR) and the granular sludge bed.And the biofilm reactor took the first place towards hydraulic shock load, followed by the granular sludge bed and SBR.The three ANAMMOX reactors were more tolerant to hydraulic shock load than to substrate shock load.When different kinds of stability assessment indices(i.e., sensitivity ratio, mean variance ratio and derivative regression function) were used, inconsistent assessment conclusions were reached.It was suggested that the mean deviation ratio and derivative regression function were more effective and universal.展开更多
基金Projects(ZR2013BL010,ZR2012DL05)supported by the Natural Science Foundation of Shandong Province,ChinaProject(4041412016)supported by the Research Excellence Award of Shandong University of Technology,ChinaProjects(2013GG03116,2011GG02115)supported by the Science and Technology Development Planning Project of Zibo,China
文摘High salinity industrial wastewater is difficult to treat using biological treatment system because of the high concentrations of salt.The potential of a sequencing batch biofilm reactor(SBBR)process in treating synthetic high salinity wastewater was evaluated at laboratory scale during a 110-day operation.The reactor was operated in a 12 h cycle,and each cycle consisted of 0.25 h influent addition,8 h aeration,3 h anoxic reaction,0.5 h sedimentation and 0.25 h effluent withdrawal.Gradual increase in salinity gradient was applied during the acclimatization period.The acclimated SBBR system was demonstrated to be an effective process to remove organic compounds and ammonia nitrogen under high salinity conditions with chemical oxygen demand(COD)and ammonia nitrogen(NH3-N)removal efficiencies of 88% and 80%,respectively.The microscopic examination indicated that rather than rotifers or vorticella,the zoogloea,filamentous fungus mingled with a small quantity of swimming infusorians were dominant bacteria in SBBR system.The removal efficiencies close to 80% in COD and 75% in NH3-N were achieved at an organic loading rate(OLR)of 0.96 kg COD/(m3·d),pH of 7.0,salinity of 14 g/L and NH3-N of 30 mg/L.
文摘The stability of performance of anaerobic ammonium oxidation (ANAMMOX) reactors was studied and the indices of performance stability were compared.The results showed that under different types of shock load, the reactors with different configurations displayed different stability.The biofilm reactor stood first in stability towards substrate shock load, followed by anaerobic sequencing batch reactor (SBR) and the granular sludge bed.And the biofilm reactor took the first place towards hydraulic shock load, followed by the granular sludge bed and SBR.The three ANAMMOX reactors were more tolerant to hydraulic shock load than to substrate shock load.When different kinds of stability assessment indices(i.e., sensitivity ratio, mean variance ratio and derivative regression function) were used, inconsistent assessment conclusions were reached.It was suggested that the mean deviation ratio and derivative regression function were more effective and universal.
