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my country is a developed country with a large corn planting area, producing about 800 tons of corn stalks every year. However, the use efficiency of corn stalks is low, such as burning or stacking on site, causing environmental pollution and wasting this resource. Anaerobic fermentation technology can be an effective technology to convert corn stover into methane.
Yang Yuyi, a researcher at the Key Laboratory of Aquatic Plants and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, and Zhao Bo, associate professor of Northeast Dianli University, have designed an electromagnetically enhanced biogas production system (pictured). The system uses a flat circular permanent hole with a central hole. The magnet provides a static magnetic field (SMF) to increase the biogas production of the corn stover substrate through anaerobic fermentation without pretreatment. The effect of SMF intensity changes on the growth of microbial populations in activated sludge is not linear. The study found that the best SMF intensity is 11.4 mT (±2%). At this level, compared with the control, the microbial population increased. The total gas production and CH4 content of SMF are 19.5% and 20.0% higher than the control NMF (no magnetic field), respectively. Compared with NMF, SMF affects the composition of the bacterial population and significantly increases the percentage of methanogens in the entire microbial population. Studies have shown that SMF can increase the yield of converting agricultural waste into biogas. Life cycle analysis showed that the conversion rate of chemical energy of corn stover into CH4 was 15.2%.
The related research results are titled Static magnetic field enhanced methane production via stimulating the growth and composition of microbial community and published in Journal of Cleaner Production.
Schematic diagram of reaction device
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