Enhancing floc sludge granulation and microbial community with electrolytic Iron-carbon filler
The formation rate of aerobic granular sludge remains crucial in wastewater treatment.Enhancing the initiation of aerobic granular sludge holds practical significance.In the paper,an external power sequenced batch reactor(SBR)at a high aspect ratio(RH/D)of 7.5 and incorporating activated sludge and iron-carbon fillers(at 0.6kg)were used,and synthetic wastewater were served as the influent to examine the sludge morphology,pollutant removal performance,microbial community shifts,and coupled process mechanisms during operation.The results showed that after 60days,yellow gourd-shaped(ladle-shaped,peanut-shaped,pear-shaped)particles were formed.The average rates of removal of COD,TP and NH4+-N in wastewater were 90.44％,84.46％and 93.20％,respectively.The dominant species were Beijerinckia(10.45％),unclassified_Saccharimonadales(5.27％),Zoogloea(38.81％)and Candidatus_Accumulibacter(2.13％).The intermittent electrolysis can causes the microbial flora structure to evolve.Electrolysis is helpful to remove sediments from the outer layer of filler,release trace carbon particles and accelerate the start-up of aerobic granular sludge.The operation strategy of adding external decoupling iron-carbon filler can effectively enhance the effect of removal of decarburization and phosphorus from wastewater,and also realize the enrichment of different types of microorganisms.
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