Regulation and control method for efficiently recovering phosphorus in livestock and poultry feces

Abstract

The invention discloses a regulation and control method for efficiently recovering phosphorus in livestock and poultry feces. The regulation and control method comprises the steps of introducing the livestock and poultry feces into a microwave induced oxidation control reactive tank, adding an oxidant solution and oxygen, and performing pulsed microwave irradiation by using a microwave regulation and control device; introducing supernatant fluid of the treated livestock and poultry feces into a microwave crystallization process control reactive tank, adding a magnesia mixture solution and a pH value regulating agent, performing mechanical stirring on the mixed solution, and performing pulsed microwave irradiation by using the microwave regulation and control device; introducing the supernatant fluid after reaction into a sedimentation tank, and overflowing water by adopting a decanter; and performing intermittent sludge discharge control on struvite crystal mud, and recovering the crystal mud by adopting a bag filter. The method disclosed by the invention can improve the recovery efficiency of phosphorus in the livestock and poultry feces, and the phosphorus recovery rate is more than 99%; the method disclosed by the invention can be used for efficiently converting organic phosphorus in the livestock and poultry feces into inorganic phosphorus, the conversion rate of the organic phosphorus is more than 99%, and the conversion time is less than 60 minutes; the method disclosed by the invention can be used for regulating and controlling the width and position of a metastable region of struvite crystals to realize efficient crystallization and granulation of struvite.

Description

technical field [0001] The invention relates to a control method for phosphorus recovery in livestock and poultry manure, and belongs to the technical field of agricultural resources and environment. Background technique [0002] Phosphorus is an essential element in the life process, however, phosphorus is facing the contradiction of scarcity of resources in the world. At the same time, a large amount of phosphorus is lost from the environment, which not only leads to eutrophic pollution of water bodies, but also makes phosphorus non-renewable. In recent years, the problem of livestock and poultry manure pollution has become increasingly prominent, especially the excessive discharge of phosphorus in livestock and poultry manure, which urgently needs reasonable treatment and utilization. Therefore, it is of great research value to recycle phosphorus resources in livestock and poultry manure, and to combine artificial recycling of phosphorus nutrients with environmental poll...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a control method for the recovery of phosphorus in livestock and poultry manure. The present invention utilizes the principle of microwave chemistry to realize microwave-induced oxidation control and microwave crystallization process control, and overcomes the limited ability to convert organic form phosphorus to inorganic form phosphorus. , Difficulty in dynamic control of struvite crystallization and granulation process, avoiding the problem of low recovery efficiency of phosphorus from livestock and poultry manure