Nanjo Kohei
Development of biogas purification technology for CO2 use
Himeno Shuji,Komatsu Toshiya
Has been concerned about a reduction in Japan's food self-sufficiency, food problem on a global scale is a serious problem. Is a new technical innovation need to develop it to efficiently produce and cultivate food. Sewage treatment plant is in the process of performing the aggregate sewage treatment, for reclaimed water that contains a bio-gas and nitrogen and phosphorus occurs, it is possible to cultivation of plants and algae. Thought that the recovery of CO2 from the biogas.
In this study, aimed at the development of the system for recovering CO2 from biogas focus on membrane separation process among the gas purification technology to high purity.
System is intended to agriculture, it is desirable to construct a simple system at low cost.ĦĦUsing inexpensive organic film separation factor 50 were constructed three other separation system (1) 1-stage separation process (2) non-transmitting-side two-stage process (3) the permeate side a two-stage system. Transmitting-side two-stage system, it was possible to achieve the desired concentration. Others, could not highly purified. Transmitting-side two-stage system is considered to be CO2 efficiently separated with a small membrane area. Further supply flow rate of the permeate side a two-stage system, to verify the influence of pressure, the pressure distribution exerted on the membrane was found to be greater consequences for the system. Membrane area ratio is investigated by trial calculation, it is necessary to change the ratio. It is preferable as a method for operating the supply system is capable of intermittent operation, it was confirmed for the immediate response of the membrane separation. In the case of separation membrane alone, it was able to confirm an immediate response. The entire system was found to take three or more minutes to stabilize. It is considered to be possible by installing a storage tank.
We went the algae culture experiments to supply the collected CO2 from the biogas. Experiment was conducted in Nagaoka purification center. The result is due to reduction of the stirring speed, algae biogas from CO2 showed low values as compared to the standard gas. Results of the indoor culture experiments, because the algae are able to stably cultured, was found to be capable of algal culture from biogas.
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