A method for processing organic waste by coupling hydrogenation fermentation with microalgae cultivation

Abstract

The invention discloses an organic waste treatment method in hydrogen alkane fermentation coupling microalgae breeding, and belongs to the technical fields of environmental protection and new energy. The method comprises the following steps: (1) preparing hydrogen through anaerobic fermentation; (2) preparing methane through anaerobic fermentation of residues; (3) applying hydrogen alkane generated to heat supply and power generation or to sale as vehicle fuel after being purified; (4) preprocessing fermentation liquor; (5) by taking the processed fermentation liquor as a matrix, breeding microalgae through carbon dioxide in hydrogen alkane generated by fermentation and carbon dioxide generated by burning the hydrogen alkane; and (6) mixing the collected microalgae with organic waste, and turning to the step of fermenting again. The method disclosed by the invention, through hydrogen and methane fermentation steps, improves waste treatment efficiency and energy recovery rate; the fermented liquid, through a nitrogen and phosphorus removal process of algae, functions as purifying; a sewage discharge indicator is achieved on an aspect of nitrogen and phosphorus, and the algae can serve as a raw material of anaerobic fermentation to continuously produce biological hydrogen alkane; and environment value added energy is realized.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and new energy, and in particular relates to a method for treating organic wastes through hydroalkane fermentation coupled with microalgae cultivation. Background technique [0002] my country has a large output of organic waste. Taking agricultural waste as an example, my country produces about 3 billion tons of livestock and poultry manure every year, plus nearly 30 billion tons of urine and waste water. Only the three major livestock manures of pigs, cattle, and sheep emit COD every year. About 69 million tons. Utilizing organic waste to ferment and produce gaseous biofuel is an effective way to produce clean energy, which is also conducive to ecological construction and environmental protection, and is easy to realize industrial application. Production of gaseous bioenergy by fermentation is currently mainly a means of producing methane through biogas fermentation. However, t...

AI Technical Summary

Problems solved by technology

[0007] From the perspective of existing technologies and processes, conventional biogas fermentation has the following problems: low energy recovery rate, low removal rate of organic pollutants, direct discharge will pollute the environment

Nitrogen and phosphorus in the fermentation broth are not fully recovered, and discharge into the environment will cause eutrophication problems

However, microalgae have safety problems as animal feed additives.

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