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首页> 外文期刊>Turkish Journal of Agriculture & Forestry >Pathogen reduction effects of solar drying and soil application in sewage sludge
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Pathogen reduction effects of solar drying and soil application in sewage sludge

机译：太阳能干燥和污泥施用土壤的病原减少效果

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摘要

The responses of sludge faecal coliforms, Salmonella, and Ascaris lumbricoides to heat drying, solar dehydration, and inactivation in soil are examined in this study. The presence of Salmonella in raw sludge cake after treatment was low, and absent for most of the cases. Likewise, the viable Ascaris eggs were not determined because of absent or low prevalence. Faecal coliforms, on the other hand, drastically decreased from 4.2 x 10~7 MPN g~(-1) Dry Solid (DS) to absence by heat drying. Faecal coliform numbers in solar and non-solar drying treatments were not declined below 1.0 x 10~3 MPN g~(-1) after drying to 90% DS and also during the storage of 12 weeks. After 6 weeks, faecal coliform and Salmonella levels in the soil surface application fell below undetectable limits. The coliform numbers below soil surface fell gradually over 12 weeks and numbers were below undetectable limits at end of the experiment. These results showed that although the solar drying has significant effects on removing pathogenic microorganisms during hot and dry periods, the soil treatment was still necessary for the final complete inactivation. Solar exposure on the soil surface was found to be effective on the elimination of pathogens.
机译：在这项研究中，研究了污泥粪便大肠菌，沙门氏菌和A虫对土壤的热干燥，太阳能脱水和失活的响应。处理后的原始污泥饼中沙门氏菌的含量很低，并且在大多数情况下不存在。同样，由于缺乏或患病率低，未确定可行的A虫卵。另一方面，通过加热干燥，粪便大肠菌群从4.2 x 10〜7 MPN g〜（-1）干燥固体（DS）急剧降低至不存在。干燥至90％DS后以及在储存12周期间，日光和非太阳能干燥处理中的粪大肠菌群数量均未降至1.0 x 10〜3 MPN g〜（-1）以下。 6周后，土壤表面施用的粪便大肠菌群和沙门氏菌含量降至无法检测的极限以下。在土壤表面以下的大肠菌群数量在12周内逐渐下降，并且在实验结束时其数量低于无法检测的极限。这些结果表明，尽管在炎热和干燥期间进行太阳干燥对去除病原微生物具有显着效果，但土壤处理对于最终完全灭活仍然是必需的。发现在土壤表面的日光照射可有效消除病原体。

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