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Enhancement of granulation and start-up in the anaerobic sequencing batch reactor

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The phenomenon of granulation was studied in anaerobic sequencing batch reactors (ASBRs) treating a synthetic sucrose wastewater. The objective was to study methods of minimizing the time typically required for start-up of anaerobic processes, such as the ASBR. Specifically, it was hypothesized that development of a granular biomass soon after initial start-up of the ASBR would significantly decrease the overall time required to achieve given organic and hydraulic loading rates.

Laboratory-scale ASBRs were seeded with anaerobically digested municipal biosolids and operated until granulation was observed or for a period of 5 months without granule development, whichever occurred first. Granule development was measured by determination of the average particle diameter of a representative sample of biosolids from the ASBRs.

Granulation enhancements were added to the ASBRs to initiate early granule development and to aid in start-up. Enhancements included powdered activated carbon, granular activated carbon, silica sand, garnet, polymers, and ferric chloride. The cationic polymer had the most beneficial effects on granulation enhancement, reducing the time required to form granules by approximately 75% compared to an un enhanced control ASBR.
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Keywords: ASBR; COD; ENHANCEMENT; GRANULATION; METHANE; POLYMER; START-UP

Document Type: Research Article

Publication date: 1996-07-01

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    Water Environment Research (WER) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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