Influence of factors on wastewater treatment efficiency using aerobic granular sludge in SBR technology

Abstract

Transplanting and application of aerobic granulation in SBR technology has been researched since 1970, this technology has been researched further in recent years with different substances such as: glucose, acetate, ethanol, molasses, sugar, starch, phenol, axit phtalic, chloroanilines, tert-butyl wine, and synthetic wastewater. The efficiency of aerobic granular sludge treatment depends on many factors such as: Organic load, settling time, temperature, pH, aeration flow... This essay describes the the influence of factors on the wastewater treatment efficiency of application of aerobic granulation in SBR technology in the laboratory. Researches on reactors of the same SBR technology with 0,11 m in diameter and 1m in height, water level height 0,8 m, working volume of 2.5 lit. The names of the 2 models are A and B. The reactors were operated sequentially with 6 cycles /1 day, each cycle is divided into 4 periods, lasting 4 hours: 1 - 2 min of influent filling, 180 min of aeration, 20 - 30 min of settling and 10 - 15 min of effluent… The results removal over 92 %COD, 90 % NH₄⁺-N with low strength has OLR from 1,0 - 1,2 kgCOD/m³.day; COD removal over 90 %COD, 89 % NH₄⁺-N with high strength has OLR from 2,7 - 3,0 kgCOD/ m³.ngày; removal COD 60 – 92 %, NH₄⁺-N 58 – 90 %, T-N 15-48 %, T-P 20 – 21 % with air supply flow 1,5 - 4,5(lít/min); the temperature from 25 - 35⁰C hardly affects the treatment efficiency of aerobic granular sludge; the worse the wastewater treatment capacity and instability of aerobic granules if lower pH. The time for  research are 55 days.