Study on the producing of biogas from heterotrophic Chlorella residue

In order to make full use of algae residue in the process of fermentation and oil production of heterotrophic Chlorella, the p H, NH₄⁺, COD, total carbon content, VFA content and gas production were used as the indexes and algae residue in the production process were used as a research object for biogas fermentation in this article.The results showed that the fermentation system of using raw material by thermal acid 1000 m L of fermentation broth 56 days of gas production was 7700 m L at 50 ℃fermentation temperature, the gas production was the highest.In this fermentation process, the p H was decreased, indicating that the acidification process is proceeding smoothly.NH₄⁺, COD, VFA content, total carbon content change range is small, indicating that the raw material utilization rate was relatively high, the fermentation process was relatively stable.The research provides a reference for the selection of oil extraction process from heterotrophic Chlorella and the use of waste during the process of oil production.