Development of an off-line enricher-reactor process for activated sludge degradation of hazardous wastes
The improvement in degradation of a hazardous chemical using a novel bioaugmentation scheme was studied. Bench-scale offline batch enricher-reactors (ERs) maintaining an enrichment culture were used to bioaugment bench-scale continuous-flow activated sludge reactors treating 1-naphthylamine (1NA). In batch experiments, onetime bioaugmentation inoculations of 1, 2, 5, 10, 20, and 50% by mass of a INA-degrading culture (mg mixed liquor volatile suspended solids [MLVSS] of INA-degrading culture/mg MLVSS of indigenous culture) increased degradation rates by approximately 0, 33, 100, 100, 100, and 300% respectively over an uninoculated control. In continuous-flow experiments, separate 13.7-L reactors received daily inoculations of 1.4, 2.5, 6.6, 11.4, and 18.3% by mass of 1 NA-degrading culture. Cumulative target compound breakthrough reduction following a 50 mg 1NA/L spike was 13, 21, 11, 35, and 41% compared to an unacclimated control and 4, 13, 1, 27, and 35% compared to an acclimated control, respectively. Similarly, the reduction in breakthrough during reacclimation to 5 mg 1NA/L over six days was 66, 73, 85, 98, and 100%, respectively. A 6% bioaugmented continuous-flow reactor significantly reduced 1NA breakthrough following a step-loading increase from 1 to 5 mg 1NA/L compared to an uninoculated control. Effective bioaugmentation was achieved with additions of biomass equivalent to 14-25% of indigenous cell production rates.
Document Type: Research Article
Publication date: September 1, 1992
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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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