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Method of recycling nitrogen and phosphorus from farming feces to prepare high-purity magnesium ammonium phosphate

A high-purity ammonium magnesium phosphate technology, applied in chemical instruments and methods, phosphorus compounds, sludge treatment, etc., can solve the problems of nitrogen and phosphorus loss, low content of ammonium magnesium phosphate, low recovery rate of nitrogen and phosphorus, etc., to achieve Reduce nitrogen and phosphorus removal load and cost, high economic and social benefits, high yield

Inactive Publication Date: 2019-04-23
GUANGZHOU JIAKANG ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this process has the following deficiencies: 1) solid-liquid separation is carried out on the breeding manure first, and only the sewage is collected for the recovery of nitrogen and phosphorus elements, which cannot make full use of the nitrogen and phosphorus in the manure, and a large amount of nitrogen and phosphorus are lost. The content of active ingredients in the ammonium magnesium fertilizer is low, and the recovery rate of nitrogen and phosphorus is low; 2) Additional phosphorus or nitrogen needs to be added, resulting in the increase of ammonia nitrogen and total phosphorus in the effluent after treatment, and it is difficult for the effluent to meet the discharge standard; 3) The recovered Magnesium ammonium phosphate is a sludge fertilizer containing magnesium ammonium phosphate, the content of magnesium ammonium phosphate is low, and the difficulty and cost of magnesium ammonium phosphate purification are relatively high

Method used

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  • Method of recycling nitrogen and phosphorus from farming feces to prepare high-purity magnesium ammonium phosphate

Examples

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Effect test

Embodiment 1

[0028] A method for preparing high-purity magnesium ammonium phosphate from reclaiming nitrogen and phosphorus from breeding manure (process flow chart see figure 1 ), including the following steps:

[0029] 1) Dissolution of organic amines and phosphorus: collect the aquaculture manure into the pretreatment tank, start the stirring system, stir for 0.5h, fully break up the feces in the aquaculture manure and fully mix them with the sewage;

[0030] 2) Natural precipitation: transfer the material in the pretreatment tank to the natural sedimentation tank, and naturally settle for 5 hours to obtain the supernatant and the lower layer of slurry;

[0031] 3) Flocculation and sedimentation: Transfer the lower layer slurry in the natural sedimentation tank to the coagulation sedimentation tank, add flocculant iron salt (dosing amount is 200ppm), carry out flocculation and sedimentation for 2 hours, obtain supernatant and sludge, and transfer the sludge to into the sludge treatment...

Embodiment 2

[0036] A method for preparing high-purity magnesium ammonium phosphate from reclaiming nitrogen and phosphorus from breeding manure (process flow chart see figure 1 ), including the following steps:

[0037] 1) Dissolution of organic amines and phosphorus: collect the aquaculture manure into the pretreatment tank, start the stirring system, stir for 1 hour, fully break up the feces in the aquaculture manure and fully mix them with the sewage;

[0038] 2) Natural precipitation: transfer the material in the pretreatment tank to the natural sedimentation tank, and naturally settle for 5 hours to obtain the supernatant and the lower layer of slurry;

[0039] 3) Flocculation and sedimentation: Transfer the lower layer slurry in the natural sedimentation tank to the coagulation sedimentation tank, add flocculant iron salt (dosing amount is 250ppm), carry out 3h flocculation and sedimentation, obtain supernatant and sludge, and transfer the sludge to into the sludge treatment system...

Embodiment 3

[0044] A method for preparing high-purity magnesium ammonium phosphate from reclaiming nitrogen and phosphorus from breeding manure (process flow chart see figure 1 ), including the following steps:

[0045] 1) Dissolution of organic amines and phosphorus: collect the aquaculture manure into the pretreatment tank, start the stirring system, stir for 1 hour, fully break up the feces in the aquaculture manure and fully mix them with the sewage;

[0046] 2) Natural precipitation: transfer the material in the pretreatment tank to the natural sedimentation tank, and naturally settle for 6 hours to obtain the supernatant and the lower layer of slurry;

[0047] 3) Flocculation and sedimentation: transfer the lower layer slurry in the natural sedimentation tank to the coagulation sedimentation tank, add flocculant iron salt (dosing amount is 300ppm), carry out flocculation and sedimentation for 4 hours, obtain supernatant and sludge, and transfer the sludge to into the sludge treatme...

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Abstract

The invention discloses a method of recycling nitrogen and phosphorus from farming feces to prepare high-purity magnesium ammonium phosphate. The method comprises the steps of 1) dissolving out organic amine and phosphorus; 2) allowing natural precipitating; 3) carrying out flocculating precipitating; 4) carrying out anaerobic treatment; 5) carrying out crystallization and post-treatment. The method has no need for solid-liquid separation or addition of a nitrogen source or phosphorus source; N and p in farming feces can be fully recycled; magnesium ammonium phosphate has high purity and yield; nitrogen and phosphorus removal load and cost of a biochemical system can be decreased; the method has high economic benefit and social benefit.

Description

technical field [0001] The invention relates to a method for recovering nitrogen and phosphorus from breeding manure to prepare high-purity magnesium ammonium phosphate. Background technique [0002] With the expansion of the scale of the farming industry and the improvement of intensification, the total discharge of farming manure has reached tens of billions of tons. At the same time, due to the widespread use of high-protein and phosphorus-rich feed, the pollutants such as organic matter, ammonia nitrogen, and phosphorus in the aquaculture manure seriously exceed the standard, and because the aquaculture manure has the characteristics of high nitrogen and phosphorus, it cannot meet the requirements of C:N:P= The biochemical treatment requirements of 100:5:1 make the treatment of breeding manure a difficult problem in the industry. [0003] At present, in order to make the aquaculture sewage discharge up to the standard, it is usually necessary to separate the feces from ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F9/14C01B25/45C02F103/20
CPCC01B25/45C02F9/00C02F11/00C02F2103/20C02F2001/007C02F3/28C02F1/66C02F1/5281
Inventor 董部根
Owner GUANGZHOU JIAKANG ENVIRONMENTAL PROTECTION TECH