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Method for producing efficient compound fertilizer from leather wastewater through efficient denitrification

A compound fertilizer and high-efficiency technology, applied in magnesium fertilizers, inorganic fertilizers, fertilization devices, etc., can solve the problems of less reagent addition, secondary pollution, inability to effectively remove ammonia nitrogen, etc., and achieve the effect of improving mineralization capacity.

Inactive Publication Date: 2019-04-09
YANGZHOU POLYTECHNIC INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding Mg to the wastewater containing ammonia nitrogen 2+ 、PO 4 3- Reagents that generate MgNH 4 PO 4 , but the method has no effect on Mg 2+ , NH 4 + 、PO 4 3- There are strict requirements on the proportion of reagents. If the amount of reagent added is small, the ammonia nitrogen in the wastewater cannot be effectively removed. If the amount added is too large, it will cause secondary pollution.

Method used

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  • Method for producing efficient compound fertilizer from leather wastewater through efficient denitrification

Examples

Experimental program
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Effect test

Embodiment 1

[0024] (1) Dissolve dry yeast powder (100g) and glucose (200g) in deionized water (10L), culture at 30°C for 1.0h, centrifuge and wash with deionized water to obtain yeast;

[0025] (2) Add MgCl to the yeast obtained in step (1) 2 solution (10L, 1mol / L) and H 3 PO 4 Solution (10L, 1mol / L), stirred at room temperature for 0.5h, then heated to 180°C, reacted for 5h, centrifuged, washed with deionized water, dried, and ground to obtain the precursor;

[0026] (3) Put the precursor obtained in step (2) in a tube furnace, under the protection of nitrogen, increase the temperature to 800°C at a rate of 10°C / min and calcined for 4 hours, and then return to room temperature to obtain the supported A biocarbon material of magnesium and phosphate ions (hereinafter referred to as Product A).

Embodiment 2

[0028] (1) Dissolve dry yeast powder (100g) and glucose (200g) in deionized water (10L), culture at 35°C for 0.5h, centrifuge and wash with deionized water to obtain yeast;

[0029] (2) Add MgCl to the yeast obtained in step (1) 2 solution (10L, 1mol / L) and H 3 PO 4 Solution (10L, 1mol / L), at room temperature, after stirring for 0.5h, warm up to 170°C, react for 8h, centrifuge, wash with deionized water, dry, and grind to obtain the precursor;

[0030] (3) Put the precursor obtained in step (2) in a tube furnace, under the protection of nitrogen, increase the temperature to 800°C at a rate of 10°C / min and calcined for 4 hours, and then return to room temperature to obtain the supported A biocarbon material of magnesium and phosphate ions (hereinafter referred to as product B).

Embodiment 3

[0032] (1) Dissolve dry yeast powder (100g) and glucose (200g) in deionized water (10L), culture at 30°C for 1.0h, centrifuge and wash with deionized water to obtain yeast;

[0033] (2) Add MgCl to the yeast obtained in step (1) 2 solution (10L, 0.1mol / L) and H 3 PO 4 Solution (10L, 0.1mol / L), stirred at room temperature for 0.5h, then heated up to 180°C, reacted for 5h, centrifuged, washed with deionized water, dried, and ground to obtain the precursor;

[0034] (3) Place the precursor obtained in step (2) in a tube furnace, and under the protection of nitrogen, raise the temperature to 800°C at a rate of 10°C / min and calcinate for 4 hours, and then return to room temperature to obtain loaded magnesium and Phosphate ion bio-carbon material (hereinafter referred to as product C).

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Abstract

The invention relates to a method for producing an efficient compound fertilizer from leather wastewater through efficient denitrification. The method is characterized by comprising the following steps: (1) soaking a biochar material loaded with magnesium and phosphate anions into an H3PO4 solution for 12 hours, filtering, washing, and drying to obtain an activated material for later use; (2) adding the activated material prepared in the step (1) into wastewater, stirring for 1 hour, filtering, collecting precipitates, and drying, so as to obtain a product; and (3) uniformly mixing the productobtained in the step (2) with magnesium ammonium phosphate in a mass ratio of 1:3-1:5, so as to obtain the efficient compound fertilizer.

Description

technical field [0001] The invention belongs to the field of waste water treatment and reuse, and in particular relates to a method for producing high-efficiency compound fertilizer through high-efficiency denitrification of leather waste water. Background technique [0002] The ammonia nitrogen pollution produced in the process of leather wastewater treatment mainly comes from two aspects: one is the various ammonium salts added in the process of processing; the other is the conversion of organic nitrogen from the leather itself. Processes containing ammonia nitrogen in wastewater include immersion, hair removal, tanning, neutralization and dyeing, among which ammonium sulfate, ammonium chloride, etc. are used in the deliming and softening process, and ammonium bicarbonate and liquid ammonia are also used in the neutralization and dyeing process; Ammonia nitrogen in the acid and tanning process comes from the continuous release of ammonium salt residues in the leather. Sin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G1/00
CPCC05B17/00C05D5/00C05D9/00
Inventor 张书攀王卫霞
Owner YANGZHOU POLYTECHNIC INST
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