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Method for reclaiming phosphorous compound

A phosphorus compound and phosphorus-enriched technology, applied in the direction of phosphorus compounds, chemical instruments and methods, inorganic chemistry, etc., can solve problems that have not been reported, and achieve the effects of broad market prospects, obvious economic benefits, and high agricultural use value

Active Publication Date: 2012-08-22
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no report on the recovery of phosphorus in the form of struvite precipitation, especially the recovery of phosphorus in urban sludge ash or poultry manure

Method used

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  • Method for reclaiming phosphorous compound
  • Method for reclaiming phosphorous compound
  • Method for reclaiming phosphorous compound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The dewatering filtrate of urban sewage plant sludge is rich in phosphorus, which is a typical phosphorus-rich sewage. The test took the sludge dewatering filtrate of a sewage plant in Chaohu City as the research object, and its pH value was 7.2, P0 4 3- The concentration is 1.4mmol / L. First, 732-type cation exchange resin was used to remove heavy metals in the filtrate, the liquid-solid ratio was 5mL / g, the reaction time was 30min, and the stirring speed was 250rpm. Then, add 40g / L magnesium chloride and 10g / L ammonium chloride solution (Mg:N:P=1.3:1.3:1) in the filtrate, adopt the pH value of the potassium hydroxide adjustment solution of 4mol / L at 9.5-10.5 In between, the solution was stirred at a speed of 400rpm for 15min, and a precipitate was formed. After filtering with filter paper, the desired struvite precipitate is obtained.

[0029] The results show that the sludge dewatering filtrate is rich in phosphorus. When the liquid-solid ratio of cation exchange ...

Embodiment 2

[0031] Step 1: The poultry manure is taken from a breeding center in Shanghai. The poultry manure is mainly chicken manure with a moisture content of 72%. After incinerating for 3 hours under aerobic conditions at 800°C, the required poultry manure ash sample was obtained. After grinding, the average particle size was 150 μm, and the P content (in P 2 o 5 Total) is 12%; the second step: extract the phosphorus in the excrement ash with the hydrochloric acid stripping method, the extraction liquid-solid ratio is 50ml / g, and the concentration of hydrochloric acid is 0.2mol / L, and the extraction time is 120min, and the horizontal rotating speed is 150rpm; the third Step: Add 40g / L magnesium chloride and 10g / L ammonium chloride solution (Mg:N:P=1.3:1.3:1) to the extract, and use 4mol / L sodium hydroxide to adjust the pH value of the solution at 9.5- Between 10.5 and the solution was stirred at 400rpm for 15 minutes, and a precipitate formed. After filtering with filter paper, the ...

Embodiment 3

[0034]figure 1 It is a schematic diagram of the technological process of reclaiming phosphorus from sludge ash of urban sewage plant in the present invention. Step 1: The dewatered sludge is taken from an urban sewage plant in Shanghai, with a water content of 83.5%. Obtain the required sludge ash sample after being incinerated under aerobic conditions at 800°C for 3 hours, the average particle size after grinding is 150 μm, and the P content in the sludge ash (in P 2 o 5 Total) is 15%; Second step: extract the phosphorus in sludge ash with hydrochloric acid stripping method, extracting liquid-solid ratio is 50ml / g, and hydrochloric acid concentration is 0.2mol / L, and extraction time is 120min, and horizontal rotating speed is 150rpm; Three steps: use 732 type cation exchange resin to remove heavy metals in the extract, the liquid-solid ratio is 25mL / g, the reaction time is 30min, and the stirring speed is 250rpm; the fourth step: add 40g / L magnesium chloride and 10g / L ammon...

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Abstract

The invention discloses a method for reclaiming a phosphorous compound, which comprises the following steps of: analyzing a phosphorous-containing sample, adding a magnesium source and a nitrogen source into the phosphorous-rich extraction solution, and meanwhile controlling the pH value of the solution so that the phosphorous compound in the extraction solution is reclaimed for utilization in a form of struvite precipitation. The method for reclaiming the phosphorous compound has the advantages of simple, convenient and quick operation, reliable experiment result and the like; the reclaimed phosphorous product has extremely high agricultural utilization value; and the method can be used for extracting and reclaiming phosphorous in sludge ash of a municipal sewage plant, phosphorous-rich sewage and livestock manure, and has strong universality.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and specifically relates to a method for recovering phosphorus compounds. The recovery of phosphorus compounds is carried out by struvite crystallization and precipitation. The method is especially suitable for urban sewage plant sludge ash, phosphorus-rich sewage and poultry Recovery of phosphorus compounds from livestock manure. Background technique [0002] Phosphorus is an essential nutrient element for various life activities of humans, animals and plants. It plays a key role in the life activities of cells and is an irreplaceable natural resource. Phosphate rock resources are the lifeblood of the production of phosphorus-containing fertilizers and occupy an extremely important position in the production of phosphorus fertilizers. China is a large agricultural country, and the importance of phosphorus resources to my country's economic development is self-evident. However,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/45C02F11/00C05B17/00
Inventor 何品晶徐华成王冠钊管冬兴邵立明
Owner TONGJI UNIV
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