Process for producing methane and blue iron ore and recovering sulfur through anaerobic digestion of bioelectrochemical sludge

Abstract

The invention discloses a process for producing methane and blue iron ore and recovering sulfur through anaerobic digestion of bioelectrochemical sludge, and belongs to the field of anaerobic treatment of sludge. The process comprises a bioelectrochemical digestion reactor, a first EGSB reactor, a second EGSB reactor, a coagulation inclined plate sedimentation tank and a magnetic cyclone; wherein the two ends of the bioelectrochemical digestion reactor are communicated with the magnetic cyclone and the first EGSB reactor respectively, one end of the first EGSB reactor is communicated with an adjusting tank, one end of the adjusting tank is communicated with the second EGSB reactor, and one end of the second EGSB reactor is communicated with a V-shaped recovery tank. According to the invention, the technologies of producing the blue iron ore through anaerobic digestion of the sludge, reducing sulfate, performing sulfur autotrophic denitrification and performing anaerobic ammonia oxidation are integrated to treat residual sludge and digest supernate of the sludge, and the blue iron ore and biological sulfur are recycled; in addition, the sludge is subjected to anaerobic digestion to produce methane and generate blue iron ore, and nitrogen and sulfur are simultaneously removed through the autotrophic denitrification reaction and the anaerobic ammonia oxidation coupling reaction.

Description

technical field [0001] The invention relates to a bioelectrochemical sludge anaerobic digestion process for producing methane, blue iron ore and recovering sulfur, and belongs to the field of sludge anaerobic treatment. Background technique [0002] In recent years, with the increasing requirements for sustainable development of energy and resources, the concept of sustainable sewage treatment has also changed from the original "pollutant removal" to "energy and resource recovery". Compared with the terminal waste water treatment facility in the past, the sewage treatment plant should be a processing plant integrating energy plant, reclaimed water plant and fertilizer plant. The continuous emergence of some new technologies and methods in recent years also provides new opportunities for the realization of the above goals. At present, the main energy recovery method of sewage treatment plants is to produce biogas through anaerobic digestion of sludge, and then use the biogas...

AI Technical Summary

Problems solved by technology

Anaerobic digestion run pH and volatile fatty acids (VFAs) are two important factors that will affect the activity of methanogens if the carbon dioxide and hydrogen produced by removing organic matter are not fully converted into methane; If accumulated in the chemical digestion reactor, the pH value will decrease, which will affect the efficiency of anaerobic digestion

Invention patent CN 102701557B "A Quick Start Method for Biogas Production by Anaerobic Fermentation of Municipal Sludge" adopts the method of daily dosing of materials to reduce the accumulation of volatile fatty acids, but this method brings inconvenience to operation and management

However, sulfur autotrophic / heterotrophic denitrification collaborative denitrification can only remove nitrate nitrogen in sewage, but cannot remove ammonia nitrogen in sewage.

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