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Title: A sequencing batch anaerobic reactor for treating piggery wastewater
Authors: Ng, W.-J. 
Issue Date: 1989
Citation: Ng, W.-J. (1989). A sequencing batch anaerobic reactor for treating piggery wastewater. Biological Wastes 28 (1) : 39-51. ScholarBank@NUS Repository.
Abstract: A study was performed using a 16 litre batch anaerobic reactor for treating piggery wastewater. Operation of the reactor resembled that of the aerobic SBR process (sequencing-batch reactor) and was cyclic. Each cycle comprised settle, discharge, feed and react modes. Hydraulic retention times (HRT) of 15, 10, 5, 3 and 1 day were investigated. Liquid-solid separation within the reactor occurred readily without the aid of flocculating agents, leading to the development of a sludge blanket which could be expanded. Sludge retention times exceeded the HRT by a wide margin. For TCOD and TBOD loading rates of 0.40-6.45 and 0.20-2.45 g litre-1 day-1, reductions ranged from 53-85% and 68-89% respectively. Transient-state gas quality was very stable and methane content ranged between 76 and 80%. Rising gas bubbles did resuspend some settled sludge during 'settle' leading to quantities of suspended material leaving the reactor. The reactor required very little operator attention since it was effectively controlled by a microprocessor controller.
Source Title: Biological Wastes
ISSN: 02697483
Appears in Collections:Staff Publications

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