Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Aerobic granular sludge

Aerobic Granular Sludge: an Advanced Technology to Treat Oil Refinery and Dairy Wastewaters

M.A.I. Al-Hashimi; T.R. Abbas; G.F. Jumaha

Engineering and Technology Journal, 2017, Volume 35, Issue 3, Pages 216-221

Aerobic granular sludge (AGS) is an emerging and an advance technology for intensive and high-rate biological nutrient removal from wastewater that may play as important role in industrial wastewater treatment strategy in Iraq. Lab scale sequential batch reactor (SBR) operated with selected operation cycle was used to cultivate granular sludge for each of dairy and oil refinery wastewaters. Successful granulation process in each reactor was achieved after 72 day of operation. The results of experimental work proved the flexibility of AGS technology to treat refinery and dairy wastewater and withstand fluctuated load. The COD and NH4 removal efficiencies for oil refinery wastewater were 86% and 92%, respectively, with sludge volume index (SVI) of 50 ml/g and granules size distribution of (0.3-3) mm. While COD and NH4 removal efficiencies for dairy wastewater were 80% and 82%, respectively, with SVI of 70 ml/g and the large percentage of its granules were ranged between 0.3 and 0.5 mm and the other smaller percentage were ranged between 0.75 and 2 mm. In addition microbiology observations showed high diverse in microorganisms communities which indicated the presence of stabilized sludge in both reactors.

Performance of Aerobic Granular Sludge Bioreactor Seeded with Flocculated Activated Sludge From an Iraqi Municipal Wastewatere Treatment Plant

Talib R. Abbas; Majid A. Dixon; Mohammed A. Abdul-Majeed; Inmar N.Ghazi

Engineering and Technology Journal, 2015, Volume 33, Issue 6, Pages 1462-1472

Aerobic granular activated sludge is an attractive and promising process for intensive and high-rate biological nutrient removal (BNR) and secondary clarification in a single reactor.This work reportsthe performance of aerobic granular sludge sequential batch reactor (SBR) seeded with flocculated activated sludge collected from an Iraqi municipal wastewater treatment plant, using synthetic wastewater. The conditions under which the successful cultivation of aerobic granular sludge was done are as follows: influent chemical oxygen demand (COD) was 1100 mg/l, volumetric exchange rate was 50%, aeration time was 10 hr, anoxic time was 2 hr aerationand sludge settling time was about 0.5 min. After 90 days, the dominant granules size was 1.5-3.5 mm. The granules became regular in shape with smooth surface, sharp boundaries and compact in structure. The biomass concentration in the reactor in terms of MLSS was 4100 mg/l. Sludge volume index (SVI) was 60 ml/g. High syntheticCOD removal and simultaneous nitrification and denitrification during aerobic phase was observed. Subjection of themature granules to a low COD municipal wastewater the activity of the granules was significantly reduced.