Enhanced Anaerobic Biodegradability and Inactivation of Fecal Coliforms and Salmonella spp. in Wastewater Sludge by Using Microwaves

Authors: Pino-Jelcic, Sergio A; Hong, Seung Mo; Park, Jae K

Source: Water Environment Research, Volume 78, Number 2, February 2006 , pp. 209-216(8)

Publisher: Water Environment Federation

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Abstract:

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.

Keywords: biosolids; microwaves; anaerobic digestion; pathogen inactivation

Document Type: Research article

DOI: http://dx.doi.org/10.2175/106143005X90498

Publication date: 2006-02-01

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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.

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Enhanced Anaerobic Biodegradability and Inactivation of Fecal Coliforms and Salmonella spp. in Wastewater Sludge by Using Microwaves

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