Control of septage sanitization by limes and lactic acid fermentation

Masís-Meléndez, Federico; Segura-Montero, Fabiola; Quesada-González, Andrea

doi:10.1016/j.jenvman.2021.112203

Cited by 1 publication

(2 citation statements)

References 24 publications

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“…Finding rapid, efficient, and environmentally appropriate ways to transform FS into secure agricultural fertilizer was the major goal of this research. The only technique suggested up to this point was the employment of lactic acid bacteria to acidify FS to pH 4 [24][25][26], which is an alternative to composting (a prolonged process) [23] and chemicals (which are not environmentally friendly). The effectiveness of this treatment in reducing the infectious potential of FS, where harmful faecal bacteria do not multiply or are eliminated, is its main strength (the Introduction presents this information in greater depth).…”

Section: Discussionmentioning

confidence: 99%

“…At present, the focus of attention regarding the problem of processing FS to obtain highquality agricultural fertilizers is shifting towards the use of more sustainable microbiological approaches. Lactic acid fermentation has been shown to be promising for reducing the infectious potential of FS [9,[24][25][26]. For example, Odey et al showed that the addition of lactic acid bacteria to the FS initiated lactic acid fermentation, leading to a pH reduction to the value of four [24].…”

Section: Introductionmentioning

confidence: 99%

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Use of Alcaligenes faecalis to Reduce Coliforms and Enhance the Stabilization of Faecal Sludge

Loiko,

Kanunnikov,

Litti

2023

Sustainability

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The disposal of human faecal sludge (FS) is one of the biggest environmental problems. It can be solved by using FS as an agricultural fertilizer. However, this is hampered by the presence of pathogenic microflora and high organic matter content in FS. This paper proposes a novel treatment approach for FS to address these issues. It consists of the preliminary aerobic incubation of FS with the bioaugmentation of bacterial culture Alcaligenes faecalis DOS7. A. faecalis has been shown to inhibit the growth of various microorganisms, including coliforms (Escherichia coli). For the treatment of FS, three tanks with a volume of 1 m3 each, equipped with a mixing and aeration system, were used. A. faecalis culture was introduced into two experimental tanks at a concentration of 106 and 6.5 × 106 cells/mL. The 11-day incubation in the experimental tanks resulted in the decomposition of organic matter in the FS that was several times faster than in the control (p < 0.05). Total suspended solids decreased 2.5–5-fold, chemical oxygen demand decreased 1.8-fold, 5-day biochemical oxygen demand decreased 1.5–2-fold. At the same time, after 4 days of incubation, no coliforms were detected in the experimental tanks, and in the control, coliforms accounted for 13.9% of the total number of cells after 11 days of incubation. The proposed method of FS pretreatment is a real alternative to the existing ones and can be used both individually and in combination with other methods, for example, composting.

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