Survival of faecal coliforms and hygiene risks in soils treated
with municipal sewage sludges |
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Authors: | YH Sun YM Luo LH Wu ZG Li J Song P Christie |
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Institution: | (1) Soil and Environmental Bioremediation Research Center, State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China;(2) Graduate School of the Chinese Academy of Sciences, Beijing 100049, China;(3) Agricultural and Environmental Science Department, Queen’s University Belfast, Newforge Lane, 100049 BT9 5PX, UK |
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Abstract: | An incubation experiment was conducted to monitor effect of sewage sludge application on changes in numbers of faecal coliforms in soils over time after sludge application and evaluate the hygiene risks. Soil faecal coliform counts were made after 1, 7, 14, 28, 56 and 84 days of incubation. The faecal coliform counts in the sludge-treated soils decreased substantially with time and were similar to those in the untreated controls after incubation for 56 days. Land application of air-dried sludges increased the hygiene risks due to the re-growth of faecal coliforms, and the counts of faecal coliforms in soil treated with air dried sludge from Suzhou (91% DM) were 50 times higher than in soils with fresh dewatered sludge from Suzhou (15% DM) after 7 days of incubation. The main factors affecting the changes in faecal coliform counts were sludge type and incubation time. Sludge type determined the faecal coliform counts and the ability of the faecal coliforms to re-establish, and indigenous microorganisms competed with the faecal coliforms for nutrients during the incubation process. |
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Keywords: | faecel coliforms hygiene risks sewage sludge Yangtze River Delta |
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