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Effect of gradual increase of salt on performance and microbial community during granulation process
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Effect of gradual increase of salt on performance and microbial community during granulation process
Salinity was considered to have effects on the characteristics,performance microbial com-munities of aerobic granular sludge.This study investigated granulation process with grad-ual increase of salt under different gradients.Two identical sequencing batch reactors were operated,while the influent of Ra and Rb was subjected to stepwise increments of NaCl con-centrations(0-4 g/L and 0-10 g/L).The presence of filamentous bacteria may contribute to granules formed under lower salinity conditions,potentially leading to granules fragmenta-tion.Excellent removal efficiency achieved in both reactors although there was a small accu-mulation of nitrite in Rb at later stages.The removal efficiencies of chemical oxygen demand(COD),total nitrogen(TN),and total phosphorus(TP)in Ra were 95.31％,93.70％and 88.66％,while the corresponding removal efficiencies in Rb were 94.19％,89.79％and 80.74％.Salinity stimulated extracellular polymeric substances(EPS)secretion and enriched EPS producing bacteria to help maintain the integrity and stability of the aerobic granules.Heterotrophic nitrifying bacteria were responsible for NH4+-N and NO2--N oxidation of salinity systems and large number of denitrifying bacteria were detected,which ensure the high removal efficiency of TN in the systems.
Aerobic granular sludge(AGS)SalinityNutrient removalExtracellular polymeric substances(EPS)Microbial community
Mengfei Wang、Junguo He、Xiangke Dong、Ruimiao Zhang
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School of Environment,Harbin Institute of Technology,Harbin 150090,China
State Key Laboratory of Urban Water Resources and Environment,Harbin Institute of Technology,Harbin 150090,China
School of Civil Engineering,Guangzhou University,Guangzhou 510006,China
National Marine Environmental Monitoring Center,Dalian 116023,China
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