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首页> 外文期刊>Water Science and Technology >Two-stage anaerobic digestion process for complete inactivation of enteric bacterial pathogens in human night soil
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Two-stage anaerobic digestion process for complete inactivation of enteric bacterial pathogens in human night soil

机译：两阶段厌氧消化过程可完全灭活人夜土壤中的肠细菌病原体

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摘要

Anaerobic digestion offers a good alternative for human waste treatment. However, the fate of enteric bacterial pathogens present in human night soil (HNS) remains a major concern for hygienic safety of the process. A two-stage anaerobic digestion process, consisting of separate acidogenic and methanogenic digesters, was designed and its efficacy in the inactivation of Salmonella typhi was compared to a single-stage digestion process. In a single-stage digestion, complete pathogen inactivation was achieved only in the digesters with high levels of volatile fatty acids (VFA congruent to 18,000 mg/l) and acidic pH (congruent to 6.0). These digesters, however, showed drastic reduction in methane yield. In the two-stage digestion process, S. typhi was completely inactivated in the acidogenic digester and the methanogenic digester was free from the pathogen even after receiving a daily dose of the pathogen. The process also achieved complete inactivation of other enteric pathogens, viz., Shigella dysenteriae and Vibrio cholerae. The two-stage process was efficient in biogas generation from HNS. Thus, the two-stage process ensures complete hygienic safety in anaerobic digestion of human night soil.
机译：厌氧消化为人类废物处理提供了很好的选择。但是，人类夜土壤（HNS）中存在的肠细菌病原体的命运仍然是该过程卫生安全的主要问题。设计了一个分为两个阶段的厌氧消化过程，该过程由分别的产酸和产甲烷消化池组成，并将其在伤寒沙门氏菌灭活中的功效与一个阶段消化过程进行了比较。在单阶段消化中，仅在具有高水平挥发性脂肪酸（VFA相当于18,000 mg / l）和酸性pH（相当于6.0）的消化器中，病原体才能完全失活。然而，这些消化池显示出甲烷产量的大幅降低。在两阶段消化过程中，伤寒沙门氏菌在产酸消化池中被完全灭活，而产甲烷消化池即使每天服用病原菌也没有病原体。该过程还实现了其他肠道病原体，即痢疾志贺氏菌和霍乱弧菌的完全灭活。两步过程可有效地从HNS产生沼气。因此，两步过程确保了人夜土壤厌氧消化中的完全卫生安全。

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