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Method for recovering phosphorus in blue-green algae in struvite form

A struvite and cyanobacteria technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of long cycle, difficult odor disposal, large land occupation, etc., and achieve short reaction cycle and reduce odor. The effect of producing and producing low cost

Inactive Publication Date: 2020-06-30
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if a simple and efficient method for extracting phosphorus from cyanobacteria can be proposed, the phosphorus-rich cyanobacteria can be used as the extraction substrate for phosphorus to efficiently recover and utilize phosphorus, and it can solve the problems of long periods and problems caused by conventional treatment methods. Problems such as large land occupation and difficult odor disposal will have very important economic value and practical significance

Method used

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  • Method for recovering phosphorus in blue-green algae in struvite form
  • Method for recovering phosphorus in blue-green algae in struvite form

Examples

Experimental program
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Effect test

Embodiment 1

[0028] 1) Dry the salvaged blue-green algae, which can be dried by means of air flotation, pressure, air-drying or sun-drying. After drying, the water content of the blue-green algae is lower than 5%. After ashing and burning in an incinerator at 450°C for 2 hours, the incineration ash of blue-green algae is obtained;

[0029] 2) Add 1 mol / L sulfuric acid extract to the incineration ash of blue-green algae, fully stir for 2 hours, filter to obtain the filtrate, and set aside;

[0030] 3) Add ammonium chloride and magnesium chloride to the filtrate according to the molar ratio of n(N):n(P):n(Mg)=5:1:1.6 while stirring at a low speed;

[0031] 4) Add NaOH solution to adjust the pH value of the reaction solution to 9.0, filter and recover the precipitate, and dry to obtain the struvite crystal product, and the final phosphorus recovery rate is 98.01%.

Embodiment 2

[0033] 1) Dry the salvaged blue-green algae, which can be dried by means of air flotation, pressure, air-drying or sun-drying. After drying, the water content of the blue-green algae is lower than 5%. After ashing and burning in an incinerator at 450°C for 2 hours, the incineration ash of blue-green algae is obtained;

[0034] 2) Add 0.5 mol / L sulfuric acid extract to the incineration ash of blue-green algae, fully stir for 2 hours, filter to obtain the filtrate, and set aside;

[0035] 3) Add ammonium chloride and magnesium chloride to the filtrate according to the molar ratio of n(N):n(P):n(Mg)=5:1:1.6 while stirring at a low speed;

[0036] 4) Adding NaOH solution to adjust the pH value of the reaction solution to 8.0, recovering the precipitate, and drying it to obtain the struvite crystal product, the final phosphorus recovery rate is 99.85%.

Embodiment 3

[0038] 1) Dry the salvaged blue-green algae, which can be dried by means of air flotation, pressure, air-drying or sun-drying. After drying, the water content of the blue-green algae is lower than 5%. After ashing and burning in an incinerator at 450°C for 2 hours, the incineration ash of blue-green algae is obtained;

[0039] 2) Add 0.5 mol / L hydrochloric acid leaching solution to the incineration ash of blue-green algae, fully stir for 2 hours, filter to obtain the filtrate, and set aside;

[0040] 3) while stirring at a low speed, add ammonium chloride and magnesium chloride to the filtrate according to the molar ratio of n(N):n(P):n(Mg)=3.2:1:1.2;

[0041] 4) Adding NaOH solution to adjust the pH value of the reaction solution to 8.5, recovering the precipitate, and drying it to obtain the struvite crystal product, the final phosphorus recovery rate is 99.88%.

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Abstract

The invention discloses a method for recovering phosphorus in blue-green algae in a struvite form, which comprises the following steps: drying blue-green algae, crushing, and carrying out ashing combustion in an incinerator to obtain blue-green algae incineration ash; dissolving out phosphorus in the blue-green algae by using an acid leaching method, and filtering to obtain filtrate for later use;adding ammonium salt and magnesium salt into the filtrate while stirring at a low speed; and adding alkali liquor to adjust the pH value of a reaction solution to 8.0-10.5, filtering and recovering aprecipitate, and drying to obtain a struvite crystal product. The whole steps are simple and easy to operate, the reaction period is short, the whole phosphorus recovery process is closed, odor is reduced to the maximum extent, the prepared product struvite can be used as an efficient slow-release fertilizer and a medical raw material while phosphorus is recovered, and finally reduction, harmlessand resource treatment of salvaged blue-green algae is achieved.

Description

technical field [0001] The invention relates to the technical field of solid waste disposal and resource regeneration, in particular to a method for recovering phosphorus in blue-green algae in the form of struvite. Background technique [0002] In some nutrient-rich water bodies, blue-green algae often reproduce in large numbers in summer when the temperature is higher, and form a layer of blue-green and foul-smelling floating foam on the water surface, which is called "water bloom". Known as the "green tide". Green tides cause water quality to deteriorate, and in severe cases deplete the oxygen in the water and cause the death of fish. What's more serious is that some species of cyanobacteria (such as Microcystis) also produce microcystins, and about 50% of green tides contain a large amount of microcystins. Microcystins are not only directly toxic to fish, humans and animals, but also an important cause of liver cancer. [0003] A common method of processing blue-green...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45
CPCC01B25/451C01P2006/80
Inventor 徐颖程庆霖
Owner JIANGSU UNIV OF TECH
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