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Process for preparing calcium magnesium ammonium phosphate from desulfurization wastewater, landfill leachate and phosphorus-containing wastewater

A technology of ammonium calcium magnesium phosphate and landfill leachate, which is applied in dicalcium phosphate fertilizer, degassed water/sewage treatment, polluted groundwater/leachate treatment, etc., can solve the comprehensive treatment of undisclosed wastewater, which is difficult to treat and dispose of Waste salt and other problems to achieve the effect of reducing water consumption and improving economic benefits

Inactive Publication Date: 2020-10-13
DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, concentrating wastewater and then drying it has gradually become the mainstream method for treating high-concentration industrial wastewater. This scheme has a simple process flow and can achieve "zero discharge" of desulfurization wastewater to a certain extent, but this process will produce waste salt that is difficult to treat and dispose of.
[0008] In summary, there is no technology disclosed in the prior art for the comprehensive treatment of wastewater from various sources.

Method used

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  • Process for preparing calcium magnesium ammonium phosphate from desulfurization wastewater, landfill leachate and phosphorus-containing wastewater
  • Process for preparing calcium magnesium ammonium phosphate from desulfurization wastewater, landfill leachate and phosphorus-containing wastewater

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Experimental program
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Effect test

Embodiment 1

[0056] The desulfurization wastewater from a thermal power plant is pumped into the neutralization tank and reaction tank through the wastewater pump. Add Ca(OH) in the neutralization box 2 , adjust the pH of the wastewater to 7-9, so that some heavy metals can be precipitated. Then enter the reaction box, add organic sulfur (TMT15) in the reaction box to further precipitate Hg that cannot be precipitated by hydroxide 2+ 、Cu 2+ , Pb 2+ and other heavy metal ions. Then the wastewater directly enters the ultrafiltration device, and then the divalent calcium ions and magnesium ions are separated by nanofiltration to reduce the load of subsequent electrodialysis treatment, and the produced clean water enters the monovalent ion electrodialysis device for treatment. The main metal ions in the monovalent ion electrodialysis concentrated water side effluent are calcium, magnesium, sodium, chloride ions and a small amount of sulfate ions, TDS>18000mg / L, the concentrated water side ...

Embodiment 2

[0064] Comprehensive treatment of desulfurization wastewater, landfill leachate and phosphogypsum seepage:

[0065] Calcium, magnesium supply unit and ammonia supply unit are the same as embodiment 1. In the phosphorus supply unit, this embodiment uses phosphogypsum seepage liquid as raw material. The phosphogypsum ore seepage fluid is combined with the added polyaluminum sulfate and cationic polyacrylamide in the coagulation reaction tank to precipitate the fine suspended matter in the acidic leachate. The effluent enters an ultrafiltration device and a high-pressure reverse osmosis device that are resistant to acidic materials. Both ultrafiltration and reverse osmosis operate at constant pressure, the ultrafiltration membrane inlet pressure is 2bar, and the membrane outlet pressure is 1.7bar. The reverse osmosis membrane inlet pressure is 10bar, and the membrane outlet pressure is 9bar. The reverse osmosis concentrated water enters the storage tank 3, and the filtrate ent...

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Abstract

The invention provides a process for preparing calcium magnesium ammonium phosphate from desulfurization wastewater, landfill leachate and phosphorus-containing wastewater, and belongs to the technical field of sewage treatment. The process involves a desulfurization wastewater treatment unit, a landfill leachate treatment unit, a phosphorus-containing wastewater treatment unit and a calcium magnesium ammonium phosphate generation unit; the desulfurization wastewater treatment unit is used for treating desulfurization wastewater of a coal-fired power plant to obtain a calcium-containing solution; the landfill leachate treatment unit takes ammonia nitrogen escaped from landfill leachate in a steam stripping deamination process as an ammonia nitrogen source; the phosphorus-containing wastewater treatment unit is used for treating phosphating wastewater or phosphogypsum slag field leakage liquid to obtain a phosphorus-containing solution; the calcium magnesium ammonium phosphate generation unit is used for mixing a calcium / magnesium solution, the ammonia nitrogen and the phosphorus-containing solution, adjusting the pH value and then performing a reaction to obtain calcium phosphate,calcium fluoride, calcium hydrophosphate and magnesium ammonium phosphate precipitate. Industrial wastewater is comprehensively treated, and calcium and magnesium ions in desulfurization wastewater, nitrogen and ammonia in the landfill leachate and phosphorus in the phosphorus-containing wastewater are used for preparing a compound fertilizer raw material calcium magnesium ammonium phosphate.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and specifically relates to a process for preparing ammonium calcium magnesium phosphate from desulfurization wastewater-garbage leachate-phosphorus-containing wastewater. Background technique [0002] Calcium ammonium magnesium phosphate is a mixture of calcium hydrogen phosphate and magnesium ammonium phosphate, in which the content of nitrogen and phosphorus is higher than 20%. It is an ideal raw material for compound fertilizer production. Among them, magnesium ammonium phosphate (MAP, MgNH 4 PO 4 ·6H 2 O), commonly known as struvite, orthorhombic crystal system, the crystal is equiaxed, wedge-shaped, short columnar, thick plate-shaped, colorless, white, light yellow or brown, with glass luster, hardness 2, brittle, Slightly soluble in water and dilute acid; Hydroxycalcium Phosphate (HAP) is also a water-insoluble inorganic fertilizer. [0003] More than 90% of coal-fired power p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05B21/00C02F9/14C02F101/20C02F101/30C02F103/18C02F103/06
CPCC05B3/00C02F9/00C02F1/66C02F1/444C02F1/442C02F1/4693C02F2101/20C02F3/30C02F1/20C02F2103/18C02F2103/06C02F2101/30
Inventor 张搏金黄邓毅付平
Owner DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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