CN105174528A - Method for recovering phosphorus in culturing farm biogas slurry - Google Patents

Abstract

The invention relates to a method for recovering phosphorus in culturing farm biogas slurry, and belongs to the field of sewage treatment. The method for recycling through adding an initiator to a magnesium ammonium phosphate solid substance to generate a phosphorus-containing solution is provided against phosphorus loss caused by generation of the magnesium ammonium phosphate solid substance due to addition of in organic phosphate in the culturing farm sewage ammonia nitrogen processing process. A recovery mode is adopted to substitute a traditional removal mode, so the method has the advantages of resource saving, environmental protection facilitation, high recovery rate, low raw material cost, easy popularization and no secondary pollution.

Description

Phosphorus recovery method in a kind of plant natural pond liquid

Technical field

The present invention relates to phosphorus recovery method in a kind of plant natural pond liquid, belong to sewage treatment area.

Background technology

Along with the fast development of economy, contaminate environment event constantly takes place frequently, and as Taihu Lake blue algae bloom event in 2008, have a strong impact on local tourist industry and Drinking Water for Residents safety, the arch-criminal of everything was exactly the excess emissions of " phosphorus "; But phosphorus a kind of element that to be also occurring in nature important, on the earth, all life be unable to do without phosphorus, phosphorus be also a kind of can not in regeneration and the resource that ground can not be carried; After phosphate rock resource exploitation utilizes, now existing in the world have the phosphor resource of extraction value sharply to decline, and agriculture, industry, and people's daily life be unable to do without phosphorus again, so the recovery of R and D phosphor in sewage, has become extremely urgent problem.

Some reclaim the traditional technology of phosphorus, as crystallization process, raw material costly, reclaims phosphorus thorough not, not easily large-scale promotion, the present invention is by precipitating waste water, and the rate of recovery is high, raw materials cost ground, and the material reclaimed can make fertilizer, there is certain economic worth, can not secondary pollution be caused, easily promote.

Summary of the invention

The technical problem that the present invention mainly solves is: generate magnesium ammonium phosphate solid matter for adding phosphoric acid salt in sewage of farm NH_3-N treating treating processes, cause phosphorus loss, and the one proposed adds initiator generation solution containing phosphate from magnesium ammonium phosphate solid matter, recycled.

For solving the problems of the technologies described above, the technical solution adopted in the present invention is:

(1) take 10g struvite, after carefully cleaning with deionized water, struvite is ground, filter out 600 ~ 800 object powder;

(2) get 500mL natural pond liquid waste water, 10g is ground to form 600 object struvites and put into waste water and heat up, fully stir 20 minutes after being warming up to 60 DEG C, add 5g tricalcium silicate, be warming up to backflow 2 hours;

(3) add 20mL liming and 15g water glass, stir at temperature is 120 ~ 130 DEG C after 30 minutes and lower the temperature;

(4) solution is cooled to room temperature, adds 15g Sodium phosphate dibasic, 8g ammonium phosphate and 9g magnesium hydroxide and mix, regulate pH with the sulphuric acid soln of 0.5mol/L, adjust ph is 5 ~ 6, at room temperature magnetic agitation 2 hours, puts into reactor, ageing 4 hours at temperature 300 DEG C;

(5) take out solution and put into 50g charcoal absorption solution impurity, filter, remove solid particulate and obtain solution containing phosphate.

Principle of the present invention is: by adding magnesium salts and phosphoric acid salt in waste water, make Mg ²⁺, PO4 ^3-(or HPO ₄ ^2-) with waste water in NH ⁴⁺there is chemical reaction, generate double salt (MgNH ₄pO ₄6H ₂o) precipitate, then by adding ammonium phosphate to the sour hydrogen ammonium of Phosphorus From Wastewater and magnesium hydroxide decomposes phosphoric acid hydrogen amine in acid condition, obtain solution containing phosphate to recycle.

The invention has the beneficial effects as follows:

(1) adopt the mode reclaimed to replace traditional removing method, economize on resources, be beneficial to environmental protection;

(2) rate of recovery is high, and raw materials cost is low, easily promotes, and non-secondary pollution;

specific embodiments:

Take 10g struvite, after carefully cleaning with deionized water, struvite is ground, filter out 600 ~ 800 object powder; Get 500mL natural pond liquid waste water, 10g is ground to form 600 object struvites and put into waste water and heat up, fully stir 20 minutes after being warming up to 60 DEG C, add 5g tricalcium silicate, be warming up to backflow 2 hours; Add 20mL liming and 15g water glass, stir at temperature is 120 ~ 130 DEG C after 30 minutes and lower the temperature; Solution is cooled to room temperature, adds 15g Sodium phosphate dibasic, 8g ammonium phosphate and 9g magnesium hydroxide and mix, regulate pH with the sulphuric acid soln of 0.5mol/L, adjust ph is 5 ~ 6, at room temperature magnetic agitation 2 hours, puts into reactor, ageing 4 hours at temperature 300 DEG C; Take out solution and put into 50g charcoal absorption solution impurity, filter, remove solid particulate and obtain solution containing phosphate.

Example 1

Take 10g struvite, after carefully cleaning with deionized water, struvite is ground, filter out 600 object powder; Get 500mL natural pond liquid waste water, 10g is ground to form 600 object struvites and put into waste water and heat up, fully stir 20 minutes after being warming up to 60 DEG C, add 5g tricalcium silicate, be warming up to backflow 2 hours; Add 20mL liming and 15g water glass, stir at temperature is 120 DEG C after 30 minutes and lower the temperature; Solution is cooled to room temperature, adds 15g Sodium phosphate dibasic, 8g ammonium phosphate and 9g magnesium hydroxide and mix, regulate pH with the sulphuric acid soln of 0.5mol/L, adjust ph is 5, at room temperature magnetic agitation 2 hours, puts into reactor, ageing 4 hours at temperature 300 DEG C; Take out solution and put into 50g charcoal absorption solution impurity, filter, remove solid particulate and obtain solution containing phosphate; The present invention adopts the mode of recovery to replace traditional removing method, economizes on resources, and is beneficial to environmental protection and the rate of recovery is high, and raw materials cost is low, easily promotes, and non-secondary pollution.

Example 2

Take 10g struvite, after carefully cleaning with deionized water, struvite is ground, filter out 700 object powder; Get 500mL natural pond liquid waste water, 10g is ground to form 600 object struvites and put into waste water and heat up, fully stir 20 minutes after being warming up to 60 DEG C, add 5g tricalcium silicate, be warming up to backflow 2 hours; Add 20mL liming and 15g water glass, stir at temperature is 125 DEG C after 30 minutes and lower the temperature; Solution is cooled to room temperature, adds 15g Sodium phosphate dibasic, 8g ammonium phosphate and 9g magnesium hydroxide and mix, regulate pH with the sulphuric acid soln of 0.5mol/L, adjust ph is 5, at room temperature magnetic agitation 2 hours, puts into reactor, ageing 4 hours at temperature 300 DEG C; Take out solution and put into 50g charcoal absorption solution impurity, filter, remove solid particulate and obtain solution containing phosphate; The present invention adopts the mode of recovery to replace traditional removing method, economizes on resources, and is beneficial to environmental protection and the rate of recovery is high, and raw materials cost is low, easily promotes, and non-secondary pollution.

Example 3

Take 10g struvite, after carefully cleaning with deionized water, struvite is ground, filter out 800 object powder; Get 500mL natural pond liquid waste water, 10g is ground to form 600 object struvites and put into waste water and heat up, fully stir 20 minutes after being warming up to 60 DEG C, add 5g tricalcium silicate, be warming up to backflow 2 hours; Add 20mL liming and 15g water glass, stir at temperature is 130 DEG C after 30 minutes and lower the temperature; Solution is cooled to room temperature, adds 15g Sodium phosphate dibasic, 8g ammonium phosphate and 9g magnesium hydroxide and mix, regulate pH with the sulphuric acid soln of 0.5mol/L, adjust ph is 6, at room temperature magnetic agitation 2 hours, puts into reactor, ageing 4 hours at temperature 300 DEG C; Take out solution and put into 50g charcoal absorption solution impurity, filter, remove solid particulate and obtain solution containing phosphate; The present invention adopts the mode of recovery to replace traditional removing method, economizes on resources, and is beneficial to environmental protection and the rate of recovery is high, and raw materials cost is low, easily promotes, and non-secondary pollution.

Claims (1)

1. a phosphorus recovery method in the liquid of plant natural pond, is characterized in that concrete operation step is:

(1) take 10g struvite, after carefully cleaning with deionized water, struvite is ground, filter out 600 object powder;

(2) get 500mL natural pond liquid waste water, 10g is ground to form 600 ~ 800 object struvites and put into waste water and heat up, fully stir 20 minutes after being warming up to 60 DEG C, add 5g tricalcium silicate, be warming up to backflow 2 hours;

(3) add 20mL liming and 15g water glass, stir at temperature is 120 ~ 130 DEG C after 30 minutes and lower the temperature;

(4) solution is cooled to room temperature, adds 15g Sodium phosphate dibasic, 8g ammonium phosphate and 9g magnesium hydroxide and mix, regulate pH with the sulphuric acid soln of 0.5mol/L, adjust ph is 5 ~ 6, at room temperature magnetic agitation 2 hours, puts into reactor, ageing 4 hours at temperature 300 DEG C;

(5) take out solution and put into 50g charcoal absorption solution impurity, filter, remove solid particulate and obtain solution containing phosphate.