Application of aerobic granulation in SBR technology to treat low-strength urban wastewater

Sequencing Batch Reactor - SBR is an advanced technology to treat wastewater in Vietnam and around the world. Many studies showed that aerobic granular sludge could adapt to various types of wastewater with different organic loads such as industrial wastewater, winery and brewery wastewaters, landfill wastewater, municipal wastewaters. This paper presents the removal results of COD, NH4+-N, T-N, T-P by applying aerobic granulation in SBR technology to treat low-strength urban wastewater at Hanoi in the laboratory. Research wastewater is taken from Kim Lien wastewater treatment plant with OLR 0.4-0.6 kg COD/m3.day, equivalent to COD 150-200 mg/l, and studied for 55 days. Research is processed using the SBR technology with a bubble column of 0.11 m in diameter, 1 m in height, a water storage height of 0.8 m, and a working volume of 2.5 l. The reactor was sequentially operated 6 cycles/day. A cycle time is 4 h, in which: water filling phase 1-2 min, aeration phase 180 min, resting phase 20-30 min, discharge phase 10-15 min. The results showed the stable operation of the SBR technology with COD removal efficiency over 92% COD, 90% NH4+-N, 20% T-N, and 50% T-P.