EFFECT OF GRANULAR ACTIVATED CARBON ON WASTEWATER TREATMENT PERFORMANCE AND DYNAMIC MEMBRANE PROPERTIES IN AN AnDMBR
In this paper,a granular activated carbon(GAC)enhanced anaerobic dynamic membrane bioreactor(AnDMBR)was constructed.To explore the physicochemical and biological effects of GAC addition on the AnDMBR,the impact of different GAC dosages(3,6,10,20 g/L)on the filtration performance,pollutants removal,methane production and the characteristics of anaerobic sludge and dynamic membrane was investigated.The results showed that,compared to the control reactor without GAC addition,the turbidity removal increased by 3.1 to 12.3 percentage points,and the COD removal increased by 5.7 to 12.1 percentage points.The higher the GAC dosage,the greater the contribution to pollutant removal.Compared to the control reactor without GAC addition,the total methane yield increased by 23.7％,34.6％,24.2％,and 8.3％,respectively,with the optimal GAC dosage of 6 g/L for enhanced methane production.Adding GAC can improve the pollutant removal performance and the methanogenesis of the AnDMBR.The supplementation of GAC can reduce the content of extracellular polymeric substances(EPS)in the anaerobic sludge and dynamic membrane as well as the content of all fluorescent dissolved organic matter in the effluent,leading to a decreased growth rate of transmembrane pressure(TMP).GAC could adsorb and enrich biomass to form biological activated carbon,which increased the particle size of anaerobic sludge,modified sludge characteristics,and enhanced the porous structure of the cake layer.These features played a positive role in the long-term stable operation of the AnDMBR.
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