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Use of Inducer Compounds in the Enricher-Reactor Process for Degradation of 1-Naphthylamine Wastes
Roger W. Babcock, Jr. and Michael K. Stenstrom
Water Environment Research
Vol. 65, No. 1 (Jan. - Feb., 1993), pp. 26-33
Published by: Water Environment Federation
Stable URL: http://www.jstor.org/stable/25044259
Page Count: 8
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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 enricher-reactors (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-acetate-naphthalene, 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 1NA-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).
Water Environment Research © 1993 Water Environment Federation