Disinfection Processes

Kuo, Jeff

doi:10.2175/106143018x15289915807092

Cited by 2 publications

(1 citation statement)

References 40 publications

(40 reference statements)

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“…Biocides have found wide application as components of deodorants that prevent the biodegradation of fecal sludge (FS) and eliminate undesirable odor in dry closets, vacuum toilets in airplanes [9,10], and environmentally safe toilet complexes (ESTC) in passenger rail transport [11]. Most of these agents contain quaternary ammonium compounds (QACs) and guanidine derivatives (e.g., polyhexamethylene guanidine, PHMG), which inhibit the activity or cause the death of microorganisms and helminths [12,13].…”

Section: Introductionmentioning

confidence: 99%

Antimicrobial Properties of a Biocide Based on Quaternary Ammonium Compounds plus Polyhexamethylene Guanidine and Possible Methods for Its Deactivation

Litti

Serdyukov

Kanunnikov³

et al. 2021

Appl Biochem Microbiol

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Biocidal agents (BAs) are widely used in environmentally safe toilet complexes (ESTC) of passenger railcars to suppress microbial activity in fecal sludge (FS). The subsequent disposal of BA-containing FS at municipal sewage treatment facilities adversely affects their work due to the loss of activated sludge. The antimicrobial properties of BAs based on quaternary ammonium compounds (QAC) and polyhexamethylene guanidine (PHMG), as well as methods for its neutralization, have been studied. It was confirmed that BAs based on QAC and PHMG have an antimicrobial effect on various groups of bacteria, reducing their number by 10-100 or more times. It was found that FS contains two groups of microorganisms with different sensitivities to BA. Methods for the deactivation of BA antimicrobial action in FS were tested with (1) a deactivating agent; (2) incubation with thermophilically digested wastewater sludge as a source of the methanogenic microbial community; and (3) chemical deactivation via acidification or alkalization. The highest efficiency was obtained from thermophilic anaerobic digestion with the pretreatment of FS with a strong acid.

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