Pathogenic bacteria in leachate and municipal solid waste compost from Amphoe Muang, Changwat Phetchaburi
1993
Kanokporn Chancharoenchai
Analysis of pathogenic bacteria in compost and compost leachate from solid waste collected from Amphoe Muang Changwat Phetcha buri was conducted under 5 treatments. Treatment A dealt with the compost pile left to decompose naturally; Treatment B, with glass, metal and plastic scraps sorted from the pile, then the remaining organic waste was spread over with composting agents, phosphate-reinforced food, urea and loomy soil; Treatment C, with glass, metal and plastic scraps sorted from the pile, then the rest was mixed with compsting agents, phosphate-reinforced food, urea and loomy soil; Treatment D, with the non-sorted pile spread over with composting agents, phosphate-reinfored food urea and loomy soil; and treatment E, with the nonsorted pile mixed with composting agents, phosphate-reinforced food, urea and loomy soil. The results showed that pathogenic bacteria were found in all the five treaments and in the samples taken from each treatment leachate. Contamination of the bacteria occurred in two stages, first in the solid waste to be composted, second in the water used in wetting the solid waste, with flies acting as the carrier. Similar temperature changes were found in all the treatments, i.e. being high during the first month of composting and gradually decreasing to a steady state in the last composting phase. It was at this final phase when the bacteria were found to be increasing in number due to the temperature favorable to them, particularly Vibrio fluvialis, Vibrio cholerae non 0-1 and Salmonella enteritidis of various serotypes, all of which could cause diarrhea and spread quickly with water and food as the media. In conclusion, it is advisable that these pathogenic bacteria be removed from the compost to prevent discase hazards no matter whatever treatment is chosen for the management of solid waste.
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