| Summary: | 碩士 === 國立臺北科技大學 === 化學工程研究所 === 99 === Activated sludge is a kind of aerobic bioremediation for sewage. The method can remove soluble and colloidal organics which are biodegradable. Meanwhile, it can also take away suspended solids and other matters along with a part of phosphorus and nitrogen compounds.
This research attempts to use potassium hydrogen phthalate (KHP) as the organic salt in the wastewater treatment model. Besides, the research also collects 10 kinds of activated sludge combinations to degrade KHP of different concentration in order to study the influences between acclimated and unacclimated sludge on KHP biodegradation. By measuring the dissolved oxygen of the closed bottle and different oxygen demand respiratory pressure (Oxitops) to test the culturing conditions and oxygen consumption of the activated sludge in long term. Then, the research introduces related kinetic models to investigate the dynamics of the acclimated sludge on the potassium hydrogen phthalate as a sole carbon substrate and to explore the metabolic indexes of the aerobic microorganisms such as biological oxygen demand (BOD), respiratory pressure method and carbon consumption through analysis, calculation and further comparison with theroretical oxygen demand (ThOD) or chemical oxygen demand (COD). The experimental results show that when the concentration of KHP is under 30 ppm, 60 ppm, 100 ppm and 150 ppm, the biodegradation levels of unacclimated sludge are 29.34%, 14.67%, 8.80%, and 5.86% respectively; and the biodegradation levels of acclimated sludge are 88.02%, 88.02%, 88.02%, and 90.96% respectively. It is found that there is an obvious suppression level of the unacclimated sludge as the concentration of the KHP increases. Rejuvenating the acitivity of the acclimated sludge, the rate of KHP degradation slows down as the acitivity of the KHP increases. With a higher KHP concentration, more time is required for the acclimated sludge to process KHP degradation till the biodegradation level increases up to a fixed value.
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