Method and apparatus for comprehensively utilizing water hyacinth plant residue to produce methane

This invention belongs to methane producing techniques, especially relates to a kind of method and apparatus of governing water area pollution of water hyacinth and method of integrative using water hyacinth plant remaining to produce biogas. The step includes: spray water hyacinth leaves with herbicide which makes water hyacinth root system decompose and plants fall to pieces because of loosing water. After water hyacinth loosing weight, collect the plant remaining and immerse them with domestic waste water in the immersing pool. Cut plant remaining with double- cutting-off machine. Add some fermentation agents to produce water hyacinth plant remaining fermentation materials. Then send them to water hyacinth plant remaining fermenting tank to undertake anaerobic fermenting and produce biogas.