Effect of C/N on Granular Sludge Formation Characteristics and Pollutant Removal Laws
To investigate the impact of influent carbon-to-nitrogen(C/N)ratios on the start-up of granular sludge reactors and the characteristics of pollutant removal,a small-scale anaerobic/aerobic granular sludge reactor was constructed under mesophilic conditions using flocculated sludge as the inoculum.In the study,the effects of different influent C/N ratios(from 5/1 to 11/1)on the formation characteristics of GS and the patterns of pollutant removal were examined.Additionally,the response characteristics of intracellular polymer content in granular sludge to the influent C/N ratio were analyzed.The results showed that high C/N was prone to cause the increase of sludge volume index(SVI),poor sludge water separation effect and difficult formation of granular sludge.When C/N was 9/1,the concentration of sludge suspended solid(TSS)was 5.15～5.31 g/L,the sedimentation performance was good,and SVI was as low as 62.6～65.8 mL/g.C/N increased the content of extracellular polymer(EPS),and when C/N was 11/1,the maximum value of EPS was 58.6 mg/g.C/N increased the content of polysaccharide in EPS.C/N also affected the removal law of COD,TN and TP by GS.When C/N was 9/1,the removal efficiencies of TN,TP and COD were 74.5％～78.6％,81.6％～83.5％and 91.5％～93.5％,respectively,which were higher than those in other stages.C/N can affect the synthesis of PHA,but has no obvious effect on the content of glycogen.The results provide data support and theoretical basis for GS treatment of wastewater with different influent C/N.
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