Bacterial Growth Patterns and COD Reduction in Agitated Vessels Treating Polluted Canal Water with Fermented Products Addition

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Donyaporn Panswad
Sopa Chinwetkitvanich

Abstract

Fermented Products (FPs) are mostly solution form compounds produced by the microorganism fermentation of sugar and/or lactose as carbon and energy sources. In this study, polluted water was taken from Kaja canal in Bangkok City. The experiment with this polluted water were divided in to two parts, that is, the one with sterilized polluted water and another one with non-sterilized polluted water. Both sterilized and non-sterilized polluted waters were experimented with five different types of commercial FPs. The FPs were added into polluted water (either sterilized or non-sterilized) with the ratio of 1:10,000 by volume as suggested by FP manufacturers. Whereas, the vessels without addition of FP were set up as the controls to receive scientific data to prove the benefit of FPs application, especially in treating polluted water. The mixtures (polluted water and FP) were then aerated through moderate agitation continuously for seven days of operation.  Then, samples were taken on Days 0, 1, 3, 5 and 7 for bacterial count, while non-filtered COD (CODT) analysis were monitored only in samples on Day 0 and 7. The growth patterns of total heterotrophs showed the enhancement of growth especially in sterilized pollute water in comparison to non-sterilized one. This was postulated to be the effect of autoclaving (high temperature and pressure) which made the organic matters be more easily degradable. Besides, the SPC, LAB and PNSB growth patterns were similar between no FP addition or different FPs addition, denoting no positive effect from the FP addition. For CODT removals, the reduction of CODT after seven-day operation did not show the substantial difference between FPs addition and the ‘Control’. In brief, when both the bacterial count and CODT reduction were considered, there was no clear benefit of the FP addition to the polluted canal water, regarding its water quality improvement.

Article Details

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Research Articles

References

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