碩士 / 中華大學 / 土木工程學系碩士班 / 103 / Common tertiary wastewater treatment is under bacterial-based removal mechanism, but additional source of carbon sources must be supplied, resulting in increased processing costs. The algae can utilize dissolved carbon dioxide through photosynthesis in the water, and take advantage of this growth pattern to remove aqueous nitrogen and phosphorus, to the extent of full wastewater treatment. Due to the subtropical geographical location, the summer temperatures in Taiwan often reach 40 oC high, and the roof temperature with direct sunlight is about 50 oC. Therefore, the algae with the high temperature tolerant characteristics were preferred. Among the algae stored in our laboratory, the algal strains Thermosynechococcus elongates WFW-1 can successfully withstand the final 60 oC for a few days was selected as the algae species for this research. Common activated sludge method for wastewater treatment often adopts a continuous-mode process. However, the pure strain of algae we used in this study was always contaminated with other algae when the conventional return-sludge manner was used, shortening the overall lifetime of culture and deteriorate the incubation environment. No circulation will cause washout of algae, becoming worse in treatment efficiency. Thus, the only solution using PVA immobilized microalgae was chosen after the algae immobilization technique became mature. The experiment was divided into two parts, the first part was for determination of microalgae-based optimal growth conditions, under the regression curve through RSM experimental design with different regulatory factors for the growth of microalgae, such as largest phosphate e> trace Elements > nitric acid > temperature > sunshine hours, which were 2.25 g/L of NaNO3 for N-source, 0.02 g/L of K2HPO4‧3H2O for P-source, 0.4 mL/L of trace elements, 29 oC, and photoperiod of 18 h/d, respectively. The second part was working on the development of immobilization technology for algae to remove nitrate and phosphoric acid. The results show when algal strains was immobilized the growth rate increased by about 4.5 times, nitric acid and total phosphorus removal efficiency increased by about 0.2 times.
| Identifer | oai:union.ndltd.org:TW/103CHPI5015064 |
| Date | January 2015 |
| Creators | HUI-HUANG,TSAI, 蔡輝煌 |
| Contributors | SZ-CHWUN,HWANG, 黃思蓴 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 32 |
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