Enhancement of Aerobic Granular Sludge Initiation and Performance With Diatomite and Brewery Wastewater
This study utilized actual municipal wastewater as the source water and supplemented it with diatoma-ceous earth and brewery wastewater.The aim was to analyze the effects of diatomaceous earth addition and brew-ery wastewater adjustment on the concentration of organic matter in influent water,as well as their impact on the initiation of aerobic granular sludge(AGS)and its denitrification and phosphorus removal efficiency.The results indicated that on the 20th day,regular-shaped granules appeared in the diatomaceous earth addition system.In the sequencing batch reactor(SBR)cultivating AGS,the addition of diatomaceous earth significantly enhanced the settling performance of AGS,expediting its initiation.Additionally,the two groups of AGS strengthened with dia-tomaceous earth exhibited better denitrification and phosphorus removal effects during system operation,with shorter durations required for microbial screening and acclimatization.The reactor supplemented with brewery wastewater showed superior denitrification and phosphorus removal performance compared to the control group,and after stabilization,the effluent nitrogen and phosphorus indicators met Grade A standards.This underscores the significant impact of influent organic matter concentration on the efficient denitrification,phosphorus removal,and granule formation of aerobic granular sludge under current wastewater treatment plant conditions,serving as a critical limiting factor.Moreover,the reactor supplemented with brewery wastewater enriched relevant bacterial taxa such as Anaerolineae and Alphaproteobacteria associated with denitrification,phosphorus removal,and en-hanced granule stability.
aerobic granular sludgediatomitebrewery wastewaterdenitrification and phosphorus removal
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