THESIS
2020
xxii, 172 pages : illustrations (some color) ; 30 cm
Abstract
Hydrogen Sulfide (H
2S) gas and Sulfuric Acid (H
2SO
4) are the two materials excogitated from
the Sulfur-containing materials inside the wastewater and contaminated stormwater in sewer
and drainage system respectively by Sulfur reducing and oxidizing bacteria. In Hong Kong, due
to insufficient land space, some of the drainage and sewer system are build nearby the
community and the presence of the odorous gas could promote immense sensory
botheration to the surrounding neighbourhood. Sulfuric acid, on the other hand, would
corrode the water pipe that was constructed using the alkaline concrete. This study is to
scrutinize a sustainable and long-lasting solution to address both odor and corrosion
controversies inside the drainage and sewer system. The contemplated approach is by
ut...[
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Hydrogen Sulfide (H
2S) gas and Sulfuric Acid (H
2SO
4) are the two materials excogitated from
the Sulfur-containing materials inside the wastewater and contaminated stormwater in sewer
and drainage system respectively by Sulfur reducing and oxidizing bacteria. In Hong Kong, due
to insufficient land space, some of the drainage and sewer system are build nearby the
community and the presence of the odorous gas could promote immense sensory
botheration to the surrounding neighbourhood. Sulfuric acid, on the other hand, would
corrode the water pipe that was constructed using the alkaline concrete. This study is to
scrutinize a sustainable and long-lasting solution to address both odor and corrosion
controversies inside the drainage and sewer system. The contemplated approach is by
utilization of hydrogel technology with the incorporation of metabolic inhibitors to suppress
the total bacteria population and epoxy coating to protect the concrete façade from the
corrosive Sulfuric Acid.
Both laboratory study and field study in Jordan Valley drainage system using 400 grams of
hydrogel indicated that the total bacteria population was curtailed for 90% and 80%
respectively. Hydrogen Sulfide gas level was also discounted by 90% during the whole year
monitoring in the drainage system. Corrosion study in the drainage system also showcased
that the hydrogel was capable to retain the structural rigidity of the concrete coupon by
approximately 10% than that in the system without hydrogel. Electron images from the
concrete surface also indicated fewer blemishes and pores on the concrete surface in the
system with hydrogel presence. On the other hand, the epoxy coating was proven to be able
to retain the whole concrete mass, structural rigidity and overall concrete composition after
90 days deployment in the drainage system.
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