| Summary: | 碩士 === 淡江大學 === 水資源及環境工程學系碩士班 === 98 === Taiwan has been actively implementing the national sewage-based system, centralized sewage, reducing the amount of sewage discharged to rivers.It is the same way to cultivation of microalgae and sewage treatment system to provide a suitable environment and adequate nutrition source of biological purification mode of operation. It is replaced by cultivating microalgae to deal with sewage treatment, and it is not only improved the traditional sludge processing issue , producting algae can also made biofuel, feed and also other environmental and economical benefits.
In this study, microalgae (Chlorella sp.) cultivated in synthesized domestic wastewater as the matrix,in a batch culture, culture environment is fixed at 25 ℃, light intensity was 90 μmol．m-2．s-1, photoperiod L：D=12：12 (h), ventilation air flow rate is fixed at 1 L．min-1. It is to explore Chlorella sp. cultivated in synthesized domestic wastewater growth characteristics and growth factors. And use the concept of controling activated sludge process ─ food：microorganism ratio(F/M) in order to explore the ratio of synthesized domestic wastewater and biomass of Chlorella sp. (F/M=TOC/ Biomass) range.
The results showed that,the pH was relatively stable while using urea as the only nitrogen source to culture Chlorella sp.. Environment fix at pH 7.5 compared to pH 4 and pH 6 is good for the Chlorella sp. growth . And it is more efficient to removal nutrition. The F/M =0.05 and F/M= 4 are reached the limit,because lower or higher are not suitable for Chlorella sp.The F/M range of 0.5~2 cultivated in the synthesized domestic wastewater is more suitable.In this research, The main was to remove nutrition and the supplement by algae production. The best result was F/M=0.5,and the removal efficiency of carbon and nitrogen were 528.44 TOC mg / g-algae and 64.98 NH4-N mg/g-algae respectively, Algae production mainly supply by removing nutrition, the best result is F/M=1, the specific growth rate of 1.52d-1, and the removal efficiency of carbon and nitrogen is 398.0 TOC mg/g-algae and 47.17 NH4-N mg/g-algae respectively.
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