ABSTRACT The application of aerobic and anaerobic treatment for removal of PCBs in sludges genera... more ABSTRACT The application of aerobic and anaerobic treatment for removal of PCBs in sludges generated from a groundwater treatment system was investigated. The sludge was characterized by PCB concentrations of > 520 ppm, with Aroclors 1254 and 1260 accounting for 26 and 74%, respectively, as well as total organic carbon (TOC), and oil and grease (O&G) concentrations of 108,500 and 18,600 mg/L, respectively. Four treatments were explored: three aerobic and one anaerobic. Two types of bacterial innocula were aerobically tested: sludge from a poultry processing wastewater treatment plant, and a commercial seed (Petrobio®). Petrobio was tested aerobically with and without a biosurfactant/enzymes product (BOD-Balance™), and was also tested anaerobically. Over a period of 60 days, PCB concentrations on a volumetric and solids basis were reduced by 73.4 to 88.0% and 64.7 to 80%, respectively. Aroclors 1254 and 1260 concentrations decreased by about 76 to 89%, and 73 to 89%, respectively. TOC and O&G removal efficiencies ranged from 77 to 93%, and from 52 to 86%, respectively.Generally, sludge from the poultry processing facility achieved the best results and exhibited the most rapid biodegradation kinetics. Aerobic PCB biodegradation rates for Aroclors 1254 and 1260 were 13.5% and 23%, respectively, faster than the anaerobic biodegradation rates. Overall PCB biodegradation kinetics conformed to first-order, with rate constants ranging from 0.017 d−1 under anaerobic conditions to 0.022 d−1 under aerobic conditions, while both TOC and O&G biodegradation kinetics followed first-order kinetics, with rate coefficients in the ranges of 0.025–0.047 and 0.014 and 0.04 d−1, respectively.
Landfill leachate is considered a complex, high strength industrial wastewater. Landfill leachate... more Landfill leachate is considered a complex, high strength industrial wastewater. Landfill leachate treatment is a major challenge due to high and variable contaminant concentrations such as Chemical Oxygen Demand (COD), ammonia, and Total Dissolved Solids (TDS). Traditionally landfill leachate has been hauled or pumped to Publicly Owned Treatment Works (POTW) for disposal. The ongoing development of more stringent discharge criteria, especially for nutrients, have required many landfills to employ pretreatment for indirect discharge to the sewers or secondary treatment (or more) for direct discharge to the natural environment. Biological leachate treatment is a proven technology for organics and ammonia removal in young and mature leachate. Biological Nitrogen Removal technology, more specifically, the Anoxic/Aerobic processes have been implemented in order to achieve nitrification and denitrification and reduce the oxygen demand. This paper presents two Case Examples of landfill Lea...
... David Quesnel*, George Nakhla**, Andrew Lugowski***, and Tim Boose* *Crompton Co., 25Erb Stre... more ... David Quesnel*, George Nakhla**, Andrew Lugowski***, and Tim Boose* *Crompton Co., 25Erb Street, Elmira Ontario, N3A 3B3; **Department of Chemical & Biochemical Engineering, University of Western Ontario, London Ontario, N6A 5B9 ... Rayox Batch Discharge Tanks ...
Municipal Solid Waste (MSW) landfill leachate is considered a complex, high strength industrial w... more Municipal Solid Waste (MSW) landfill leachate is considered a complex, high strength industrial wastewater. Landfill leachate treatment is a major challenge due to high and variable contaminant concentrations such as Chemical Oxygen Demand (COD), ammonia, and Total Dissolved Solids (TDS). Traditionally landfill leachate has been hauled or pumped to Publicly Owned Treatment Works (POTW) for disposal. The ongoing development of more stringent discharge criteria, especially for nutrients, have required many landfills to employ pretreatment for indirect discharge to the sewers or secondary treatment (or more) for direct discharge to the natural environment.
ABSTRACT The application of aerobic and anaerobic treatment for removal of PCBs in sludges genera... more ABSTRACT The application of aerobic and anaerobic treatment for removal of PCBs in sludges generated from a groundwater treatment system was investigated. The sludge was characterized by PCB concentrations of > 520 ppm, with Aroclors 1254 and 1260 accounting for 26 and 74%, respectively, as well as total organic carbon (TOC), and oil and grease (O&G) concentrations of 108,500 and 18,600 mg/L, respectively. Four treatments were explored: three aerobic and one anaerobic. Two types of bacterial innocula were aerobically tested: sludge from a poultry processing wastewater treatment plant, and a commercial seed (Petrobio®). Petrobio was tested aerobically with and without a biosurfactant/enzymes product (BOD-Balance™), and was also tested anaerobically. Over a period of 60 days, PCB concentrations on a volumetric and solids basis were reduced by 73.4 to 88.0% and 64.7 to 80%, respectively. Aroclors 1254 and 1260 concentrations decreased by about 76 to 89%, and 73 to 89%, respectively. TOC and O&G removal efficiencies ranged from 77 to 93%, and from 52 to 86%, respectively.Generally, sludge from the poultry processing facility achieved the best results and exhibited the most rapid biodegradation kinetics. Aerobic PCB biodegradation rates for Aroclors 1254 and 1260 were 13.5% and 23%, respectively, faster than the anaerobic biodegradation rates. Overall PCB biodegradation kinetics conformed to first-order, with rate constants ranging from 0.017 d−1 under anaerobic conditions to 0.022 d−1 under aerobic conditions, while both TOC and O&G biodegradation kinetics followed first-order kinetics, with rate coefficients in the ranges of 0.025–0.047 and 0.014 and 0.04 d−1, respectively.
Landfill leachate is considered a complex, high strength industrial wastewater. Landfill leachate... more Landfill leachate is considered a complex, high strength industrial wastewater. Landfill leachate treatment is a major challenge due to high and variable contaminant concentrations such as Chemical Oxygen Demand (COD), ammonia, and Total Dissolved Solids (TDS). Traditionally landfill leachate has been hauled or pumped to Publicly Owned Treatment Works (POTW) for disposal. The ongoing development of more stringent discharge criteria, especially for nutrients, have required many landfills to employ pretreatment for indirect discharge to the sewers or secondary treatment (or more) for direct discharge to the natural environment. Biological leachate treatment is a proven technology for organics and ammonia removal in young and mature leachate. Biological Nitrogen Removal technology, more specifically, the Anoxic/Aerobic processes have been implemented in order to achieve nitrification and denitrification and reduce the oxygen demand. This paper presents two Case Examples of landfill Lea...
... David Quesnel*, George Nakhla**, Andrew Lugowski***, and Tim Boose* *Crompton Co., 25Erb Stre... more ... David Quesnel*, George Nakhla**, Andrew Lugowski***, and Tim Boose* *Crompton Co., 25Erb Street, Elmira Ontario, N3A 3B3; **Department of Chemical & Biochemical Engineering, University of Western Ontario, London Ontario, N6A 5B9 ... Rayox Batch Discharge Tanks ...
Municipal Solid Waste (MSW) landfill leachate is considered a complex, high strength industrial w... more Municipal Solid Waste (MSW) landfill leachate is considered a complex, high strength industrial wastewater. Landfill leachate treatment is a major challenge due to high and variable contaminant concentrations such as Chemical Oxygen Demand (COD), ammonia, and Total Dissolved Solids (TDS). Traditionally landfill leachate has been hauled or pumped to Publicly Owned Treatment Works (POTW) for disposal. The ongoing development of more stringent discharge criteria, especially for nutrients, have required many landfills to employ pretreatment for indirect discharge to the sewers or secondary treatment (or more) for direct discharge to the natural environment.
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