In this study, die-off patterns of helminth ova, fecal coliforms, and Salmonella spp. in biosolids were documented using three small-scale sand drying beds located in a greenhouse. Treatments involved tilling the biosolids with differing frequencies. The results indicate that the inactivation rate for helminth ova was 0.88, 0.55, and 0.22 eggs/4 g TS day-1 for the intensively-tilled, moderately-tilled, and control beds, respectively. Achievement of Class A criteria was only possible in the intensively-tilled bed by Day 70 of the experiment. Salmonella spp. were inactivated to Class A levels in 9 days for the intensively and moderately-tilled beds. Regrowth of Salmonella spp. occurred thereafter in all beds, but high levels were seen only in the control bed. Fecal coliforms reached Class A criteria late in the experiment. Tilling treatments enhanced the inactivation rate of helminth ova and offer a potentially cost-effective method of pathogen reduction.
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机译：在这项研究中，蠕虫卵，粪大肠菌和沙门氏菌的死亡模式。使用位于温室中的三个小型沙质干燥床记录了生物固体中的生物污染物。处理涉及以不同的频率耕种生物固体。结果表明，在强力，平铺和对照床上，蠕虫卵的失活率分别为0.88、0.55和0.22个鸡蛋/ 4 g TS day-1。到实验第70天，只有在密集倾斜的床上才能达到A级标准。沙门氏菌密集和中等倾斜的床在9天之内被灭活到A级水平。沙门氏菌的再生。此后在所有病床上均发生，但仅在对照病床上观察到高水平。粪便大肠菌群在实验后期达到A类标准。耕作处理提高了蠕虫卵的失活率，并提供了一种潜在的具有成本效益的减少病原体的方法。
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