Project for producing biogas from cassava starch wastewater and purifying natural gas
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Project for producing biogas from cassava starch wastewater and purifying it into natural gas: This project uses high-concentration organic wastewater derived from cassava starch as a raw material to produce biogas, which is then purified into natural gas suitable for use in vehicles. It can address the issues related to gas treatment and the treatment of high-concentration organic wastewater simultaneously. Using biogas in industry as a substitute for natural gas is one of the main objectives outlined in the 12th Five-Year Plan for the development of new energy sources. In 2006, in order to address the issues related to the treatment and utilization of cassava starch wastewater, Anning Starch Co., Ltd. initiated research and development on this project. With technical support from the Biotechnology Center at China Agricultural University, an entirely automated control system was developed. This technology utilizes rapid and efficient anaerobic fermentation to produce biogas from the high-concentration organic wastewater generated during cassava processing; the biogas is then purified and compressed to create compressed biofuel, which can be used as a fuel for household use and in vehicles. In 2010, this project was listed as a major science and technology demonstration project in Nanning. After more than a year of effort, the company, in collaboration with China Agricultural University, completed the design of the overall technical approach for the project as well as the development of key technologies, and installed the relevant equipment. Recently, Anning Company has increased the daily production of biogas generated from wastewater fermentation to 20,000 cubic meters, with the output of biomethane remaining stable at over 12,000 cubic meters per day. From March 5 to April 15, 2011, the company produced a total of 420,000 cubic meters of biogas, which was primarily supplied to the taxi industry in Nanning. Currently, 60 taxis across the city have been modified to use biogas-purified natural gas. Experts believe that this project is expected to resolve Nanning’s local natural gas supply issue within 5 to 10 years. According to the latest vehicle exhaust test reports, the carbon monoxide emissions from vehicles using biogas purified from biogas are 20% lower than those from vehicles using gasoline, while carbon dioxide emissions are reduced by 99%.
The treatment of wastewater from cassava processing plants has long been a source of concern for both these enterprises and **. Cassava starch wastewater is classified as high-concentration organic wastewater, and the volume of such waste is particularly large – approximately 15 tons of waste liquid are generated for every ton of starch produced. If these wastewater streams are discharged directly without proper treatment, they will cause serious damage to the local and downstream water environments. Therefore, the development of this project can not only serve as an alternative energy source but also help address the issue of managing and utilizing cassava starch wastewater.
Project for producing biogas from cassava starch wastewater and purifying it into natural gas: This project uses high-concentration organic wastewater derived from cassava starch as a raw material to produce biogas, which is then purified into natural gas suitable for use in vehicles. It can address the issues related to gas treatment and the treatment of high-concentration organic wastewater simultaneously. Using biogas in industry as a substitute for natural gas is one of the main objectives outlined in the 12th Five-Year Plan for the development of new energy sources. In 2006, in order to address the issues related to the treatment and utilization of cassava starch wastewater, Anning Starch Co., Ltd. initiated research and development on this project. With technical support from the Biotechnology Center at China Agricultural University, an entirely automated control system was developed. This technology utilizes rapid and efficient anaerobic fermentation to produce biogas from the high-concentration organic wastewater generated during cassava processing; the biogas is then purified and compressed to create compressed biofuel, which can be used as a fuel for household use and in vehicles. In 2010, this project was listed as a major science and technology demonstration project in Nanning. After more than a year of effort, the company, in collaboration with China Agricultural University, completed the design of the overall technical approach for the project as well as the development of key technologies, and installed the relevant equipment. Recently, Anning Company has increased the daily production of biogas generated from wastewater fermentation to 20,000 cubic meters, with the output of biomethane remaining stable at over 12,000 cubic meters per day. From March 5 to April 15, 2011, the company produced a total of 420,000 cubic meters of biogas, which was primarily supplied to the taxi industry in Nanning. Currently, 60 taxis across the city have been modified to use biogas-purified natural gas. Experts believe that this project is expected to resolve Nanning’s local natural gas supply issue within 5 to 10 years. According to the latest vehicle exhaust test reports, the carbon monoxide emissions from vehicles using biogas purified from biogas are 20% lower than those from vehicles using gasoline, while carbon dioxide emissions are reduced by 99%.
The hydrogen sulfide concentration in the biogas produced from this wastewater is very high; we can install a desulfurization system for this purpose