Device for crystallizing and granulating struvite by strengthening gas-liquid fluidization

Abstract

The invention discloses a device for crystallizing and granulating struvite by strengthening gas-liquid fluidization. The device is provided with a reactor main body and a settling zone, wherein the reactor main body comprises a crystal generating zone and a fluidizing layer from bottom to top, wherein an exposure opening is formed in the lower part of the crystal generating zone, and a water inlet is formed in the upper part of the exposure opening. The fluidizing layer is communicated with the settling zone by a diversion pipe; the bottom of the settling zone is connected with the bottom of the crystal generating zone through a refluxing pipe; a horizontal separation board is arranged at the lower-middle part of the settling zone; an overflow weir is arranged at the right-upper part of the settling zone. The device disclosed by the invention has the advantages that firstly, the device can realize strengthening of the gas-liquid fluidization and promote forming and growth of a struvite crystal; granulation of the struvite crystal is finally realized, the settling property of the struvite crystal is improved, the concentration of suspended matters in effluent is reduced, and clarification of the effluent is ensured; secondly, the mass transfer effect in the device can be enhanced by strengthening the circulation, the reaction efficiency is improved, the nitrogen and phosphorus removal effect of wastewater is enhanced, and efficient recovery of nitrogen and phosphorous from the wastewater is realized; thirdly, large-granular struvite can be conveniently recovered.

Description

technical field [0001] The invention relates to the field of denitrification and dephosphorization of wastewater, in particular to a device for gas-liquid fluidization enhanced struvite crystallization and granulation. Background technique [0002] During the "Twelfth Five-Year Plan" period, the discharge of chemical oxygen demand has been effectively controlled, and ammonia nitrogen has risen as the main pollutant in surface water. Exceeding the standard of ammonia nitrogen in surface water is common across the country, resulting in serious eutrophication of water bodies, which seriously endangers the physical and mental health of residents. health and social stability. my country has incorporated ammonia nitrogen into the "13th Five-Year Plan" total pollutant control system. At the same time, phosphorus, as a non-renewable and irreplaceable resource, currently has a contradiction between the shortage of phosphate rock resources and the excessive phosphorus content in the ...

AI Technical Summary

Problems solved by technology

[0006] However, the magnesium ammonium phosphate produced by the current struvite crystallization technology is mostly in the form of powder, the particles are small, the sedimentation performance is not good, and it is easy to be lost with water, which not only reduces the recovery efficiency, but also easily leads to substandard water quality.

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