Method for improving biogas slurry SBR (styrene butadiene rubber) treatment process efficiency by utilizing zeolite synthesized from fly ash

Abstract

The invention provides a method for improving biogas slurry SBR (styrene butadiene rubber) treatment process efficiency by utilizing zeolite synthesized from fly ash, and belongs to the technical field of water pollution treatment. The method is characterized in that the zeolite synthesized from fly ash by adopting a hydrothermal crystallization method has high alkalinity, so that massive consumed alkalinity in the nitrifying process can be made up after the zeolite synthesized from fly ash is put in an SBR system (the concentration of the zeolite is maintained at 2.5g / L), so that the pH value of the biogas slurry can be stabilized in a range that microorganisms grow and metabolize normally, and a biomembrane is formed on the surface of the zeolite, and the simulataneous nitrification denitrification (SND) effect can be reinforced, so that the biogas slurry NH3-N, TN (total nitrogen), COD (chemical oxygen demand) removal rate and other indexes can be increased. The method, namely zeolite synthesized from fly ash dosed SBR (ZFA-SBR), is simple and easy, and practical and reliable, and is a method with small investment for effectively improving the pollutant removing efficiency in the biogas SBR treatment process.

Description

technical field [0001] The invention relates to the technical field of anaerobic fermentation liquid treatment of livestock and poultry breeding wastewater, in particular to a method for improving the efficiency of biogas slurry SBR treatment process by using fly ash to synthesize zeolite. Background technique [0002] In recent years, my country's large-scale livestock and poultry farms have developed rapidly, and the accompanying problem of a sharp increase in the discharge of livestock and poultry manure has become increasingly prominent. In response to these problems, the state has issued a series of policies to increase investment in rural energy construction, and vigorously strengthen the construction of large and medium-sized biogas projects for large-scale livestock and poultry farms. The use of biogas technology to treat livestock and poultry breeding waste can not only control environmental pollution, but also realize waste recycling, and achieve better energy, env...

AI Technical Summary

Problems solved by technology

If the SBR process is used directly to treat the biogas slurry, because the nitrification process will consume a large amount of alkalinity, the pH value of the biogas slurry will drop rapidly, which will affect the normal growth and metabolism of microorganisms, so that the removal effect of pollutants is very poor, and it is difficult to reach the level of pollutants in livestock and poultry breeding. Emission standard (GB18596-2001)

[0004] At present, when using SBR to treat biogas slurry, the pH value of the system is often increased by adding alkali. Although the removal effect of ammonia nitrogen in biogas slurry can be significantly improved, it is difficult to improve the removal effect of COD and TN.

In addition, the economic operability of the alkali-adding method is poor, and the cost is relatively high (the cost of adding alkali is 4 yuan / m 3 over biogas slurry)