Achieving high efficiency phosphorus and nitrogen removal in low-strength municipal wastewater treatment with aerobic granular sludge process
To explore the feasibility of aerobic granular sludge(AGS)technology to treat low-strength municipal wastewater,a facility of 500 m3·d-1 aerobic granular sludge reactor(AGSR)was set in a municipal treatment plant of General Water of China Co.Ltd..The low-strength wastewater of the actual wastewater treatment plant(WWTP)was taken as influent and substrate of AGSR being inoculated the flocculent sludge in biochemical stage of this WWTP,and sludge granulation successfully occurred.The average diameter of the sludge increased from 33.85 μm to 158.25 μm,the SVI30 index decreased from 118.42 mL·g-1 to 45 mL·g-1.Without the addition of extra-carbon sources and dephosphorization agents,COD,NH4+-N,TP,TN and SS of AGSR effluent were 19.4,0.26,0.28 11.7 and 4 mg·L-1,respectively,and COD volumetric loading rates reached 4 m3·(m3·d)-1,highly effective nitrogen and phosphorus removal realized.16S rRNA gene analysis indicated that the dominant bacterial genus belonged to the functional groups associated with denitrification,carbon removal,and dephosphorization during operation.In comparison with the A2/O process in this WWTP,AGSR could save 40％power consumption,and 100％external carbon source and dephosphorization agent.The above results can provide a reference for promotion and application of AGS process in the field of low-strength municipal wastewater treatment.
aerobic granular sludge(AGS)low-strength municipal wastewaterenhanced nitrogen and phosphorus removalsludge granulation
万方数据
维普
