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Enhanced Anaerobic Biodegradability and Inactivation of Fecal Coliforms and Salmonella spp. in Wastewater Sludge by Using Microwaves
During continuous operation of three mesophilic‐anaerobic digesters, the effect of microwave irradiation, as sludge thermal pretreatment (60 to 65°C), was studied. The fecal coliforms log inactivation for microwaved/digested sludge was 4.2 ± 0.4, whereas for conventionally heated/digested sludge and control were 2.9 ± 0.5 and 1.5 ± 0.5, respectively. In the case of Salmonella spp., no colonies were detected in 85% of the microwaved/digested samples. Considering the detection limit, the log inactivation of these samples was greater than 2.0 ± 0.3. The conventionally heated/digested sludge and control showed log inactivations of 1.9 ± 0.2 and 1.1 ± 0.3, respectively. At the 95% confidence level, microwaved/digested sludge increased the biogas production by 16.4 ± 5.6% and 6.3 ± 2.4%, as compared to control and conventionally heated/digested sludge, respectively. When thermally treated sludge was analyzed for soluble chemical oxygen demand, microwaved waste‐activated sludge showed considerable solubilization between 37 and 60°C. Microwaved/digested sludge showed a reduction of capillary suction times by 11.1 ± 5.9% and 10.7 ± 5.6%, as compared to control and conventionally heated/digested sludge, respectively.
Enhanced Anaerobic Biodegradability and Inactivation of Fecal Coliforms and Salmonella spp. in Wastewater Sludge by Using Microwaves
During continuous operation of three mesophilic‐anaerobic digesters, the effect of microwave irradiation, as sludge thermal pretreatment (60 to 65°C), was studied. The fecal coliforms log inactivation for microwaved/digested sludge was 4.2 ± 0.4, whereas for conventionally heated/digested sludge and control were 2.9 ± 0.5 and 1.5 ± 0.5, respectively. In the case of Salmonella spp., no colonies were detected in 85% of the microwaved/digested samples. Considering the detection limit, the log inactivation of these samples was greater than 2.0 ± 0.3. The conventionally heated/digested sludge and control showed log inactivations of 1.9 ± 0.2 and 1.1 ± 0.3, respectively. At the 95% confidence level, microwaved/digested sludge increased the biogas production by 16.4 ± 5.6% and 6.3 ± 2.4%, as compared to control and conventionally heated/digested sludge, respectively. When thermally treated sludge was analyzed for soluble chemical oxygen demand, microwaved waste‐activated sludge showed considerable solubilization between 37 and 60°C. Microwaved/digested sludge showed a reduction of capillary suction times by 11.1 ± 5.9% and 10.7 ± 5.6%, as compared to control and conventionally heated/digested sludge, respectively.
Enhanced Anaerobic Biodegradability and Inactivation of Fecal Coliforms and Salmonella spp. in Wastewater Sludge by Using Microwaves
Pino‐Jelcic, Sergio A. (author) / Hong, Seung Mo (author) / Park, Jae K. (author)
Water Environment Research ; 78 ; 209-216
2006-02-01
8 pages
Article (Journal)
Electronic Resource
English
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