Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Development of an off‐line enricher‐reactor process for activated sludge degradation of hazardous wastes
ABSTRACT: 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.
Development of an off‐line enricher‐reactor process for activated sludge degradation of hazardous wastes
ABSTRACT: 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.
Development of an off‐line enricher‐reactor process for activated sludge degradation of hazardous wastes
Babcock, Roger W. Jr. (Autor:in) / Ro, Kyoung S. (Autor:in) / Hsieh, Chu‐Chin (Autor:in) / Stenstrom, Michael K. (Autor:in)
Water Environment Research ; 64 ; 782-791
01.09.1992
10 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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