Technologies to use the digested liquid produced by methane fermentation
2007
Yuyama, Y.(National Inst. for Rural Engineering, Tsukuba, Ibaraki (Japan)) | Nakamura, M. | Yamaoka, M.
Methane fermentation is a key technology to promote biomass use in rural areas. It is essential to develop a system that enables adequate use of the entire quantity of digested liquid produced by the methane fermentation process. Research on the use of digested liquid in agriculture sectors has progressed greatly over these past five years. The application of digested liquid has been studied not only for pastures but also for paddies, upland crops, vegetables and horticulture products. In this paper we first review recent trends and achievements of the research on digested liquid, and then present the prospects for the development of a biomass utilization system based on methane fermentation technology. The digested liquid should be used directly or after conversion for improvement of the quality. To promote the use of digested liquid, the following factors are important; 1) adequate design for fertilization, 2) improvement of handling, and 3) countermeasures to minimize environmental loads. It is desirable to develop a total system by cooperation among the many organizations concerned, especially in areas where methane fermentation is advantageous in terms of demand potential for the digested liquid and high rates of nitrogen and energy recovery.
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