Efficient method for preparing biogas with water hyacinths

Abstract

The invention relates to an efficient method for preparing biogas with water hyacinths, and belongs to the field of environmental protection and biomass energy. Medium temperature anaerobic fermentation technology is selected and used as basic technology, innovatively invented flexible material smashing achieves homogeneity of raw materials, inoculating of acetic bacteria accelerates acidification speed of the materials, urea is supplied to balance the nutrient of fermentation broth, and other technical measures are adopted. The efficiency of organic carbon transforming into methane is greatly improved, organic loading of a reactor is improved by 2 to 5 times, residence time is shortened to 1 day, a volume gas generating ratio is improved to 1.5 m<3> / m<3>*d, and a fresh ton gas generating ratio is up to 25 m<3>, and therefore the speed of producing biogas from the water hyacinths is accelerated, and the fact that the water hyacinths are used as energy plants through an enterprise-oriented operation becomes possible.

Description

technical field [0001] The invention relates to a high-efficiency method for preparing biogas from water hyacinth, which is a method for converting solar energy captured by aquatic plants into biomass energy through anaerobic fermentation. The key technology used belongs to the field of environmental protection and biomass energy. Background technique [0002] The research on the use of water hyacinth as raw material for anaerobic fermentation to prepare biogas (biogas) can be traced back to the 1950s, and a wealth of research and application data has been accumulated for a long time. Although many studies have been carried out under different experimental conditions, the pretreatment method The results of , fermentation conditions, and gas production capacity are quite different. The main research results and published patents are summarized as follows. [0003] 1. Representative research results [0004] A large number of research reports are based on water hyacinth as a...

AI Technical Summary

Problems solved by technology

[0011] 7. In 1992, Abbasi et al. researched that the water hyacinth is relatively light and easy to float, and the water content is too high, which makes it difficult to feed and discharge the reactor and is easy to block, and it is inconvenient to adjust the organic load. Even if the water hyacinth is chopped in the traditional batch There are still practical application difficulties in the reactor

[0038] Several invention patents have proposed the method of anaerobic fermentation of water hyacinth to produce biogas, which basically belongs to the direct application of general technical principles, and is basically consistent with the process parameters of anaerobic fermentation of manure and straw. First, water hyacinth is not clearly defined as an energy plant, and secondly, the application is general Furthermore, no biological acidification technology has been adopted, and fourthly, no nitrogen supplement technology has been applied. The existing technology has low efficiency and is difficult to adapt to engineering, and cannot realize the requirement of efficient utilization of water hyacinth as an energy plant.