Method and device for preparing composite phosphate fertilizer from wastewater

A phosphate fertilizer and wastewater technology, applied in fertilization equipment, sewage/sludge fertilizer, chemical instruments and methods, etc., can solve the problems of less adsorption, low purity of phosphate fertilizer, harsh conditions, etc., and achieve saving of operating costs and high selective adsorption , good separation effect

Active Publication Date: 2020-03-13
SHANDONG JIANZHU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the current problems of less phosphorus removal adsorption in wastewater, difficult regeneration of adsorbent, harsh conditions, and low purity of phosphate fertilizer, another object of the present invention is to provide a device for preparing compound phosphate fertilizer from dewatered sludge waste liquid, in which the device can Complete phosphorus separation, phosphorus recovery and adsorbent regeneration steps, reducing equipment volume and process steps

Method used

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  • Method and device for preparing composite phosphate fertilizer from wastewater
  • Method and device for preparing composite phosphate fertilizer from wastewater
  • Method and device for preparing composite phosphate fertilizer from wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1 Preparation of lanthanum-loaded adsorbent

[0038] (1) N 2 Under protection, 0.42mol / L FeCl 3 solution with 0.21mol / L FeCl 2 Solution and 25wt% ammonia monohydrate solution were mixed and stirred according to the volume ratio of 1:1:2, and 0.50mol / L nitric acid was added to adjust the pH to 3 to obtain Fe 3 o 4 Nano magnetic nucleus precursor suspension 66 mL;

[0039] (2) Under the condition of heating in a water bath at 70°C, slowly inject 5mL of an ethanol solution of 10wt% trimethylsiloxysilicate into the suspension prepared in step (1) until the concentration of sodium silicate is 2.5wt%, The precipitate was magnetically separated, washed and dried to obtain SiO 2 wrapped Fe 3 o 4 Granules 5.2g;

[0040] (3) Add 3.65g of magnesium chloride hexahydrate (18 mmol), 0.3176g of aluminum trichloride hexahydrate (3mmol), and 1.11g of lanthanum chloride heptahydrate (3mmol) into 400mL of NaOH solution with a concentration of 1.5mol / L, A magnesium aluminu...

Embodiment 2

[0043] Example 2 Preparation of adsorbent for loading hafnium

[0044] (1) N 2 Under protection, 0.42mol / L FeCl 3 solution with 0.21mol / L FeCl 2 Solution and 25wt% ammonia monohydrate solution were mixed and stirred according to the volume ratio of 1:1:2, and 0.50mol / L nitric acid was added to adjust the pH to 3 to obtain Fe 3 o 4 Nano magnetic nucleus precursor suspension 66 mL;

[0045] (2) Under the condition of heating in a water bath at 70°C, slowly inject 5mL of an ethanol solution of 10wt% trimethylsiloxysilicate into the suspension prepared in step (1) until the concentration of sodium silicate is 2.5wt%, The precipitate was magnetically separated, washed and dried to obtain SiO 2 wrapped Fe 3 o 4 Granules 5.2g;

[0046] (3) Add 3.65g of magnesium chloride hexahydrate (18 mmol), 0.3176g of aluminum trichloride hexahydrate (3mmol), and 1.7g of hafnium oxychloride octahydrate (3mmol) into 400mL of NaOH solution with a concentration of 1.5mol / L , to obtain a magn...

Embodiment 3

[0049] Example 3 Preparation of adsorbent for loading cerium

[0050] (1) N 2 Under protection, 0.42mol / L FeCl 3 solution with 0.21mol / L FeCl 2 Solution and 25wt% ammonia monohydrate solution were mixed and stirred according to the volume ratio of 1:1:2, and 0.50mol / L nitric acid was added to adjust the pH to 3 to obtain Fe 3 o 4 Nano magnetic nucleus precursor suspension 66 mL;

[0051] (2) Under the condition of heating in a water bath at 70°C, slowly inject 5mL of an ethanol solution of 10wt% trimethylsiloxysilicate into the suspension prepared in step (1) until the concentration of sodium silicate is 2.5wt%, The precipitate was magnetically separated, washed and dried to obtain SiO 2 wrapped Fe 3 o 4 Granules 5.2g;

[0052] (3) Add 3.65g of magnesium chloride hexahydrate (18 mmol), 0.3176g of aluminum trichloride hexahydrate (3mmol), and 1.8g of cerium chloride hydrate (3mmol) into 400mL of NaOH solution with a concentration of 1.5mol / L to obtain Magnesium aluminu...

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Abstract

The invention provides a device for preparing a composite phosphate fertilizer from wastewater. The device comprises a mixed adsorption reaction unit, a magnetic separation and regeneration unit and acomposite phosphate fertilizer crystallization unit three units. The invention further provides a method for preparing the phosphate fertilizer by adopting the device. The method can be used for treating wastewater with COD<=2000mg / L, BOD5<=500mg / L, ammonia nitrogen<=500mg / L, phosphate<=80mgP / L and pH value of 6.0-7.0. According to the device disclosed by the invention, an adsorption reactor, a magnetic separation coupling regeneration reactor and a crystallization reactor are organically combined together, the high-purity phosphate fertilizer can be finally prepared, and an adsorption material can be recycled; the crystallization reactor can realize phosphate fertilizer online production, and the final phosphate fertilizer yield can reach 400-500g / t waste liquid. According to the wastewater recycling method disclosed by the invention, efficient and high-selectivity adsorption of phosphate can be realized; one-stop phosphate fertilizer output is achieved, the adding amount of the adsorbent is small, the complex crystallization separation process is avoided, the separation effect is good, and the operation cost is saved.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and relates to a method and a device for preparing compound phosphate fertilizer by using waste water. Background technique [0002] Phosphorus recovery technology in urban sewage plants is one of the research hotspots; for a sewage treatment plant, phosphorus in sewage is easy to accumulate in sludge digestion liquid, especially dewatered sludge waste liquid. Chemical phosphorus removal includes calcium phosphate crystallization method, struvite precipitation method, ion exchange adsorption method, etc., but these materials or methods have a small amount of adsorption on phosphate. The operating conditions of these methods are slightly harsh, the selectivity to phosphate is poor and the regeneration is difficult, and even more difficult to handle phosphorus-containing sludge, the wastewater problem is transformed into a waste problem, and more importantly, some interfering components in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05F7/00C05G1/00C02F1/28C02F9/12B01J20/10B01J20/28B01J20/30C02F101/10
CPCC05F7/00C05G1/00B01J20/041B01J20/08B01J20/103B01J20/28009B01J20/06C02F1/281C02F1/48B01J2220/4806B01J2220/42C02F2101/105C02F2303/16Y02A40/20
Inventor 赵茜王洪波李梅张克峰王宁刘承芳刘磊
Owner SHANDONG JIANZHU UNIV
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