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Use of inducer compounds in the enricher-reactor process for degradation of 1-naphthylamine wastes

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The feasibility of using less hazardous inducer compounds to maintain the ability of an enrichment culture to degrade a hazardous compound was investigated. Bench-scale (5 L) batch enricherreactors (ERs) maintaining enrichment cultures were used to bioaugment bench-scale continuous-flow activated sludge reactors treating 1-naphthylamine (1NA). Potential inducer compounds tested were 1-acetatenaphthalene, 1-naphthoic acid, 1-naphthalene-sulfonic acid, and gentisic acid. In batch experiments, subcultures of the original enrichment culture that had been grown on potential inducer compounds for a period of 3 months without 1NA, maintained the ability to degrade 1NA but at reduced rates compared to a control maintained on 1NA. In continuous-flow experiments, separate 13.7-L reactors received daily inoculations of 2–4% by mass of INA-enrichment culture, or 3% by mass of the subcultures maintained on inducer compounds. Target compound breakthrough from augmented reactors was significantly reduced (relative to an acclimated control) following a step-increase from 1 to 5 mg 1NA/ L, and reintroduction of 5 mg 1NA/L after its absence from the waste stream for 9 days (two separate experiments). A modest reduction of breakthrough was also observed following a 10 mg 1NA/L spike (a separate experiment).

Keywords: 1-naphthylamine; activated sludge; bioaugmentation; biodegradation; enricher-reactors; inducer compounds

Document Type: Research Article


Publication date: January 1, 1993

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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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