| Summary: | 碩士 === 淡江大學 === 水資源及環境工程學系碩士班 === 100 === Microalgae are useful material to treat wastewater. Nitrogen and phosphorus of the wastewater are the necessary elements of microalgae growth. Microalgae could quickly purify wastewater and also could generate a large amount of biomass. Microalgae are great producer for fuel because it has higher photosynthetic efficiency and growth rate than other energy crops. However, a big problem for using microalgae to treat the waste water is separation of the microalgae and liquid. Immobilization of microalgae is one of the solution methods for this problem.
For finding out the optimum parameters of microalgae growth and nutrient removal, this study used the different C/N ratios of photosynthetic heterotrophic culture as basis to explore the mechanism of the microalgae growth. The different C/N ratios and F/M ratios of the immobilized particle number and particle size were tested to find out the optimum growth parameters of the immobilized culture.
The results showed that the highest specific grower rate is 2.44 1/day in photosynthetic heterotrophic culture when the C/N ratio is 10. And the highest remove rate of N and C were 16.71 mg/g·hr and 86.99 mg/g·hr, respectively. Furthermore, in immobilized culture, the more of particle number and the less of the F/M ratio did not improve the Chlorella sp. growth and nutrient removal. In the blank experiment, the gel particle without seeding with microalgae, the nitrate nitrogen and total organic carbon were removed 141 mg/L and 684 mg/L, which indicated that the gel particle could absorb that nutrient. Therefore, in this study, when the F/M ratio is 0.2 and particle number is 6:1(v/v), the highest removed quantity of nitrate and total organic carbon were 141 mg/g·hr and 684 mg/g·hr, respectively.
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