Based On Zhaoye Cultivate Chlorella (chlorella Vulgaris) Purified Biogas Technology Research

Every year, China produces about40million tons of animal manure, straw, and other rural solid waste. In the rural areas, due to the lack of ability to focus and the large number of renewable resources available, many of these resources such as straw are often piled up and burn in the fields.This process is a waste of energy, and pollutes the rural environment.Rural solid waste fermentation produces biogas that is very suitable for the development of green sources of energy in China. The technology and operation required are simple, and the construction costs are low. Existing small-scale agricultural biogas fermentation has two serious problems.The first is the low quality methane. Low CH4content of the active ingredients that can burn biogas, and the high CO2concentration.The second is the difficulty to produce biogas anaerobic fermentation process in presence of high concentrations of pollutants slurry:on these conditions, improper handling will cause very serious pollution.Chlorella vulgaris cells in addition to the use of organic carbon source for growth and reproduction, health long, but also in heterotrophic culture conditions, normal use of solar energy and carbon dioxide under autotrophic conditions and slurry process with CO2coupled. This thesis is to explore the CO2fixation by microalgae and sewage treatment:the use of nutrient-rich biogas slurry culture chlorella, fixed methane in carbon dioxide, chlorella harvest a certain amount can be used as a fermentation raw materials return to the fermentation marsh system. Constitute an almost zero pollution "resource cycle" ring. This research focused on the feasibility of purifying biogas slurry and upgrading biogas simultaneously. The biogas slurry and CO2in biogas was utilized as the culture medium and carbon source of Chlorella vulgaris, respectively.The optimum operating conditions were biogas slurry concentration of50%, initial pH6.0, initial algal dry weight0.20mg/mL, and light wavelength red. Then, the removal efficiency of COD, TN, TP and BOD5was achieved at88.5%,91.2%,95.3%, and87.6%, respectively. Particularly, the content of CH4in biogas was upgraded from40%to60.2%. These results indicated that the method of biogas slurry purifying and biogas upgrading by Chlorella vulgaris studied in this research was able to solve the problem of environment pollution caused by high load pollutants biogas slurry, as well as low quality of biogas.