Method and system for combined air stripping biogas slurry depth treatment and biogas purification and desulfurization

Abstract

The invention belongs to the technical field of waste water multilevel processing and particularly relates to a method and a system for combined air stripping biogas slurry depth treatment and biogas purification and desulfurization. Under the regulation of an additive, high-concentration ammonia nitrogen in the biogas slurry is removed by recycle gas through an air stripping mode, the gas after the air stripping is absorbed through acid liquid and serves as ammonium fertilizer to be applied, the use added value of the biogas slurry is improved, the system operation cost is reduced, the additive is added in an air stripping device, phosphorus and organic matters in the biogas slurry are subjected to flocculating settling, and the biogas slurry serves as slow release fertilizer to be applied after being collected and processed. Fecal coliform in the biogas slurry is eliminated effectively, the waste heat is used for heating the air stripping device, the air stripping efficiency of ammonia nitrogen is improved, and the optimized use of the system heat is improved. The biogas slurry after air stripping and sterilization is directly used for absorbing hydrogen sulfide and carbon dioxide in biogas, the biogas purification and desulfurization can be achieved, and the potential of hydrogen (PH) and the hardness of the processed biogas slurry can be reduced.

Description

technical field [0001] The invention belongs to the technical field of multi-stage treatment of waste water, and in particular relates to a method and a system for combining advanced treatment of blowing biogas liquid and biogas purification and desulfurization. Background technique [0002] The use of anaerobic fermentation biogas technology to treat livestock and poultry waste, crop straw, domestic waste and other organic waste can not only control environmental pollution, but also realize the resource utilization of waste, and achieve better energy, environmental protection and economic benefits. benefit. In recent years, my country's large and medium-sized biogas projects have experienced an unprecedented growth momentum, but the advanced disposal of anaerobic fermentation liquid after biogas production is still a worry. As far as the actual situation in our country is concerned, the anaerobic fermentation liquid produced by large and medium-sized biogas projects is lar...

AI Technical Summary

Problems solved by technology

Its desulfurization methods are generally divided into biological methods and physical and chemical methods. Among them, the biological method has attracted wide attention due to its simple equipment, low energy consumption, and less secondary pollution, but the control conditions are strict.

Although the physicochemical method has been widely used and has accumulated rich experience, it has disadvantages such as high operating costs, large investment, and secondary pollution.

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