藻菌共生生物接触转盘反应器的研制和运行

The use of municipal sewage to cultivate high-fat microalgae can not only realize the harmless treatment of sewage, but also recover microalgae to prepare biodiesel. In this study, a biological contact turntable reactor and an algal-bacterial symbiotic system were combined to design an algal-bacterial symbiotic biological contact turntable reactor. The reactor was inoculated with Scenedesmus dimorphus, the sewage provided nitrogen and phosphorus for the growth of microalgae. In algal-bacterial symbiotic system, bacteria decomposed organic matter in the sewage and provided carbon source for microalgae, while the microalgae produced oxygen for the growth of bacteria through photosynthesis. A laboratory test equipment was used as the research object. The optimal influent load of the reactor, the growth status of the microalgae in the reactor and the removal of pollutants from the reactor were investigated. The results showed that the system has a relatively optimal organic load (measured as COD) of 2.71 kg•(m³•d)^-1.The inoculation volume of Scenedesmus dimorphus accounted for 9.4% of the total volume of the reactor, and the final cell concentration in the three reaction cells was 1.50×10⁶, 1.75×10⁶ and 2.10×10⁶ cell•mL^-1 when external light source was added to the system. The addition of microalgae increased the ammonia nitrogen and nitrogen and phosphorus removal efficiency, but the promotion of organic matter removal was not obvious.