CN110316713A - A method of recycling n-p-k element from urine sewage - Google Patents
A method of recycling n-p-k element from urine sewage Download PDFInfo
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- CN110316713A CN110316713A CN201910712142.3A CN201910712142A CN110316713A CN 110316713 A CN110316713 A CN 110316713A CN 201910712142 A CN201910712142 A CN 201910712142A CN 110316713 A CN110316713 A CN 110316713A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/26—Phosphates
- C01B25/45—Phosphates containing plural metal, or metal and ammonium
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/26—Phosphates
- C01B25/45—Phosphates containing plural metal, or metal and ammonium
- C01B25/451—Phosphates containing plural metal, or metal and ammonium containing metal and ammonium
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G1/00—Mixtures of fertilisers belonging individually to different subclasses of C05
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Inorganic Chemistry (AREA)
- Pest Control & Pesticides (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Fertilizers (AREA)
Abstract
The method that this application provides a kind of to recycle n-p-k element from urine sewage, add corresponding reagent first to adjust pH and precipitation reaction occurs, nitrogen and P elements are recycled in a manner of generating magnesium ammonium phosphate sediment, then it adds corresponding reagent again to adjust pH and precipitation reaction occurs, recycles phosphorus and potassium element in a manner of generating potassium phosphate calcium precipitate；Through practice test, nitrogenous fertilizer content is 10wt%~20wt% (with ureometer) in gained slow-release compound nitrogen phosphate fertilizer, and phosphate fertilizer content is 30wt%~50wt% (in terms of phosphorus pentoxide)；Potash fertilizer content in gained slow-release phosphorus potassium complex fertilizer is 10wt%~12wt% (in terms of potassium oxide), and phosphate fertilizer content is 30wt%~50wt% (in terms of phosphorus pentoxide)；The rate of recovery of nitrogen is up to 80% or more, and the rate of recovery of P elements is up to 90% or more, and the rate of recovery of potassium element is up to 70% or more.
Description
Technical field
The present invention relates to urine technical field of sewage, recycle N P and K member from urine sewage more particularly, to one kind
The method of element.
Background technique
N P and K is most important three kinds of nutrients in plant growing process, but our times various countries especially I
State, phosphorus potassium resource are nervous.World's proved reserves of phosphorus ore can only maintain 80~100 years；Potassium mine is concentrated mainly on a few state
Family, China's potassium resource heavy dependence import, import potassium is for a long time up to 70% or more, after phosphorus potassium is all classified as 2010 by Ministry of Land and Resources
It is not able to satisfy the important mineral of national economic development demand.At the same time, water eutrophication is also that intractable in water pollution is asked
Topic.The sewerage nitrogen and phosphor discharge and the quickening of urbanization process not being effectively controlled, so that in terms of China's water prevention and cure of pollution
Pressure is increasing, and the upgrading of municipal sewage plant's denitrification dephosphorization technique is imperative at present, but also increases at water simultaneously
The cost of reason.Therefore, nutrient is recycled from sewage provide a kind of more sustainable thinking to alleviate this contradiction.
The report of water environment institute, Swiss Confederation points out, for each person every day isuria 1.5L, although only accounting for displacement per capita
About 1%, but contribute to the nitrogen of city domestic sewage 80%, 50% phosphorus and 90% potassium.By urine separation from source
Formula collects the content of nitrogen and phosphorous for being meant to largely reduce city domestic sewage, reduces end sewage treatment plant denitrogenation dephosphorizing
Pressure reduces the risk of nitrogen, phosphorus exhaust emission water environment, will play very crucial effect to improvement urban water-body water quality.With
This containing the nutrient of high concentration in urine, contains about 8 kilograms of nitrogen, 0.8 kilogram of phosphorus and 2.2 thousand simultaneously in every cubic metre of urine
Gram potassium, especially wherein potassium content is about 6 times of seawater, this makes urine become the huge treasure-house of N P and K resource, realizes it
Above-mentioned nutrient is traditionally considered as by the closed circulation that the recycling of middle N P and K can promote nutrient substance to flow, change
The open type disposal options of pollutant, this will be a kind of more sustainable sewage treatment mode.
The utilization approaches of urine have two, first is that being used as agricultural fertilizer after urine is decomposed, second is that nutrient in urine
Technology recycling.Urine is decomposed, refers to the ammonifying process that urine occurs during storage, and occur with ammonifying process
Biology, physical and chemical changes.At this point, urea is converted into the ammonia nitrogen that plant is easy to absorb.It can effectively kill within urine decomposed 180 days
It goes out Escherichia coli and pathogenic bacteria, meets the safety standard of agricultural liquid fertilizer.This utilization approaches has at low cost, operation letter
Single advantage, the demonstration project of most sources separation at present is all to have used this utilization approaches.But urine is as agricultural liquid
Body fertilizer has significant limitation, and the urine 180 days decomposed huge storage spaces of needs, land occupation and capital construction are at high cost, and rotten
To there are problems that the loss of nitrogen phosphorus and peculiar smell in ripe influence surrounding enviroment, and it is decomposed in urban area that these limitations limit urine
Large-scale application.In contrast, the technology recycling of nutrient is hopeful to break through the office that urine is used as liquid fertilizer in urine
It is sex-limited, to accomplish scale production in urban area.
How a kind of economically feasible, strong operability are provided, the side of nitrogen, phosphorus, potassium element can be recycled from urine sewage simultaneously
Method effectively carries out recycling to it while realizing urine sewage treatment, promote economic benefit, be current those skilled in the art
The technical issues of urgent need to resolve.
Summary of the invention
The method that the object of the present invention is to provide a kind of to recycle n-p-k element from urine sewage.
In order to solve the above technical problems, technical solution provided by the invention are as follows:
A method of it recycling n-p-k element from urine sewage, includes the steps that next coming in order carry out:
1) mixing liquid A is made in the aqueous solution that sodium hydroxide is added into urine sewage, controls the aqueous solution of sodium hydroxide
The pH of additive amount to mixing liquid A rise to 7.5~9；
Then mixed liquor is made in the aqueous solution of the aqueous solution and sodium dihydrogen phosphate that add magnesium chloride into mixing liquid A again
Body B controls the additive amount of the aqueous solution of magnesium chloride and the aqueous solution of the sodium dihydrogen phosphate NH into mixing liquid B4 +Substance
Amount: PO4 3-Substance amount: Mg2+Substance amount=1:(2~4): (2~4) stir while adding, in liquid B to be mixed go out
Existing sediment stops stirring after no longer increasing, and stands mixing liquid B after stopping stirring so that sediment therein standing is heavy
It drops, is filtered to obtain the sediment B of hygrometric state and liquor B after standing sedimentation；
2) sediment B of hygrometric state made from step 1) is subjected to drying granulation, gained particle B is that slow-release nitrogen phosphorus is compound
Fertilizer；
3) mixed liquor is made in the aqueous solution that calcium hydroxide powder and sodium dihydrogen phosphate are added into liquor B made from step 1)
Body C controls the additive amount of the aqueous solution of calcium hydroxide powder and sodium dihydrogen phosphate until the pH of mixing liquid C is 9~11 and mixes
Close K in liquid C+Substance amount: PO4 3-Substance amount: Ca2+Substance amount=1:(1~1.5): (2~4), side be added
Side is stirred, and the sediment occurred in liquid C to be mixed stops stirring after no longer increasing, and stands mixing liquid C after stopping stirring
So that sediment standing sedimentation therein, it is filtered to obtain the sediment C of hygrometric state and liquor C after standing sedimentation；
4) the sediment C of hygrometric state made from step 3) is subjected to drying granulation, gained particle C is that slow-release phosphorus potassium is compound
Fertilizer.
Preferably, in step 1), in step 1), Mg in the urine sewage2+Content be 40~80mg/L, NH4 +Contain
Amount is 4000~6000mg/L, and the content of TP is 200~500mg/L, K+Content be 1500~3000mg/L.
Preferably, in step 1), mixing time is 10min~15min, and mixing speed is 90r/min~120r/min, quiet
Setting the sedimentation time is 20min~30min.
Preferably, in step 3), mixing time is 30min~40min, and mixing speed is 200r/min~300r/min,
The standing sedimentation time is 30min~40min.
The method that this application provides a kind of to recycle n-p-k element from urine sewage, is added into urine sewage first
The aqueous solution of sodium hydroxide rises to 7.5~9 to adjust pH, then adds the aqueous solution of magnesium chloride and the water of sodium dihydrogen phosphate again
Solution recycles nitrogen and P elements so that precipitation reaction occurs in a manner of generating magnesium ammonium phosphate sediment；
Then add the aqueous solution of calcium hydroxide powder and sodium dihydrogen phosphate again with adjust pH and occur precipitation reaction, with
The mode for generating potassium phosphate calcium precipitate recycles phosphorus and potassium element；
Through practice test, nitrogenous fertilizer content is 10wt%~20wt% (with ureometer) in gained slow-release compound nitrogen phosphate fertilizer,
Phosphate fertilizer content is 30wt%~50wt% (in terms of phosphorus pentoxide)；
Potash fertilizer content in gained slow-release phosphorus potassium complex fertilizer is 10wt%~12wt% (in terms of potassium oxide), phosphate fertilizer content
For 30wt%~50wt% (in terms of phosphorus pentoxide)；
The rate of recovery of nitrogen is up to 80% or more, and the rate of recovery of P elements is up to 90% or more, the rate of recovery of potassium element
Up to 70% or more；
This method economically feasible, strong operability can realize the recycling nitrogen, potassium, P elements from urine sewage step by step, realize dirty
Economic benefit effectively is promoted to its recycling while water process.
Specific embodiment
For a further understanding of the present invention, the preferred embodiment of the invention is described below with reference to embodiment, still
It should be appreciated that these descriptions only further illustrate feature and advantage of the invention, rather than to the limit of the claims in the present invention
System.
The method that this application provides a kind of to recycle n-p-k element from urine sewage, the step carried out including next coming in order
It is rapid:
1) mixing liquid A is made in the aqueous solution that sodium hydroxide is added into urine sewage, controls the aqueous solution of sodium hydroxide
The pH of additive amount to mixing liquid A rise to 7.5~9；
Then mixed liquor is made in the aqueous solution of the aqueous solution and sodium dihydrogen phosphate that add magnesium chloride into mixing liquid A again
Body B controls the additive amount of the aqueous solution of magnesium chloride and the aqueous solution of the sodium dihydrogen phosphate NH into mixing liquid B4 +Substance
Amount: PO4 3-Substance amount: Mg2+Substance amount=1:(2~4): (2~4) stir while adding, in liquid B to be mixed go out
Existing sediment stops stirring after no longer increasing, and stands mixing liquid B after stopping stirring so that sediment therein standing is heavy
It drops, is filtered to obtain the sediment B of hygrometric state and liquor B after standing sedimentation；
2) sediment B of hygrometric state made from step 1) is subjected to drying granulation, gained particle B is that slow-release nitrogen phosphorus is compound
Fertilizer；
3) mixed liquor is made in the aqueous solution that calcium hydroxide powder and sodium dihydrogen phosphate are added into liquor B made from step 1)
Body C controls the additive amount of the aqueous solution of calcium hydroxide powder and sodium dihydrogen phosphate until the pH of mixing liquid C is 9~11 and mixes
Close K in liquid C+Substance amount: PO4 3-Substance amount: Ca2+Substance amount=1:(1~1.5): (2~4), side be added
Side is stirred, and the sediment occurred in liquid C to be mixed stops stirring after no longer increasing, and stands mixing liquid C after stopping stirring
So that sediment standing sedimentation therein, it is filtered to obtain the sediment C of hygrometric state and liquor C after standing sedimentation；
4) the sediment C of hygrometric state made from step 3) is subjected to drying granulation, gained particle C is that slow-release phosphorus potassium is compound
Fertilizer.
In one embodiment of the application, in step 1), Mg in the urine sewage2+Content be 40~80mg/L,
NH4 +Content be 4000~6000mg/L, the content of TP (total phosphorus) is 200~500mg/L, K+Content be 1500~
3000mg/L。
In one embodiment of the application, in step 1), mixing time is 10min~15min, mixing speed 90r/
Min~120r/min, standing sedimentation time are 20min~30min.
In one embodiment of the application, in step 3), mixing time is 30min~40min, and mixing speed is
200r/min~300r/min, standing sedimentation time are 30min~40min.
The working principle of the application:
The working principle of step 1):
The working principle of step 3):
For a further understanding of the present invention, one kind provided by the invention is recycled from urine sewage below with reference to embodiment
The method of n-p-k element is described in detail, and protection scope of the present invention is not limited by the following examples.
Embodiment 1
Mg in urine sewage2+Content be 50mg/L, NH4 +Content be 5000mg/L, the content of TP is 320mg/L, K+
Content be 2800mg/L.
A method of it recycling n-p-k element from urine sewage, includes the steps that next coming in order carry out:
1) mixing liquid A is made in the aqueous solution that sodium hydroxide is added into urine sewage, controls the aqueous solution of sodium hydroxide
The pH of additive amount to mixing liquid A be maintained at 8；
Then mixed liquor is made in the aqueous solution of the aqueous solution and sodium dihydrogen phosphate that add magnesium chloride into mixing liquid A again
Body B controls the additive amount of the aqueous solution of magnesium chloride and the aqueous solution of the sodium dihydrogen phosphate NH into mixing liquid B4 +Substance
Amount: PO4 3-Substance amount: Mg2+Substance amount=1:2:3, stir while adding, the sediment occurred in liquid B to be mixed
Stop stirring after no longer increasing, stands mixing liquid B after stopping stirring so that sediment standing sedimentation therein, standing sedimentation
After be filtered to obtain the sediment B of hygrometric state and liquor B；
In step 1), mixing time 15min, mixing speed 110r/min, the standing sedimentation time are 25min；
2) sediment B of hygrometric state made from step 1) is subjected to drying granulation, gained particle B is that slow-release nitrogen phosphorus is compound
Fertilizer；
3) mixed liquor is made in the aqueous solution that calcium hydroxide powder and sodium dihydrogen phosphate are added into liquor B made from step 1)
Body C controls the additive amount of the aqueous solution of calcium hydroxide powder and sodium dihydrogen phosphate until the pH of mixing liquid C is 10 and mixed liquor
K in body C+Substance amount: PO4 3-Substance amount: Ca2+Substance amount=1:1:3, stir while adding, liquid to be mixed
The sediment occurred in C stops stirring after no longer increasing, and stands mixing liquid C after stopping stirring so that sediment therein is quiet
Sedimentation is set, is filtered to obtain the sediment C of hygrometric state and liquor C after standing sedimentation；
In step 3), mixing time 35min, mixing speed 300r/min, the standing sedimentation time are 35min；
4) the sediment C of hygrometric state made from step 3) is subjected to drying granulation, gained particle C is that slow-release phosphorus potassium is compound
Fertilizer.
Through practice test, nitrogenous fertilizer content is 20wt% (with ureometer) in slow-release compound nitrogen phosphate fertilizer made from embodiment 1,
Phosphate fertilizer content is 45wt% (in terms of phosphorus pentoxide)；
Potash fertilizer content in slow-release phosphorus potassium complex fertilizer made from embodiment 1 is 12wt% (in terms of potassium oxide), and phosphate fertilizer contains
Amount is 30wt% (in terms of phosphorus pentoxide)；
The rate of recovery of nitrogen is 84%, and the rate of recovery of P elements is 98%, and the rate of recovery of potassium element is 74%.
The above description of the embodiment is only used to help understand the method for the present invention and its core ideas.It should be pointed out that pair
For those skilled in the art, without departing from the principle of the present invention, the present invention can also be carried out
Some improvements and modifications, these improvements and modifications also fall within the scope of protection of the claims of the present invention.
Claims (4)
1. a kind of method for recycling n-p-k element from urine sewage, which is characterized in that include the steps that next coming in order carry out:
1) mixing liquid A is made in the aqueous solution that sodium hydroxide is added into urine sewage, controls adding for the aqueous solution of sodium hydroxide
The pH of dosage to mixing liquid A rise to 7.5~9；
Then mixing liquid B is made in the aqueous solution of the aqueous solution and sodium dihydrogen phosphate that add magnesium chloride into mixing liquid A again,
The additive amount of the aqueous solution of the aqueous solution and sodium dihydrogen phosphate of control magnesium chloride NH into mixing liquid B4 +Substance amount:
PO4 3-Substance amount: Mg2+Substance amount=1:(2~4): (2~4) stir while adding, occur in liquid B to be mixed
Sediment no longer increase after stop stirring, mixing liquid B is stood after stopping stirring so that sediment standing sedimentation therein,
It is filtered to obtain the sediment B and liquor B of hygrometric state after standing sedimentation；
2) sediment B of hygrometric state made from step 1) is subjected to drying granulation, gained particle B is slow-release compound nitrogen phosphate fertilizer；
3) mixing liquid C is made in the aqueous solution that calcium hydroxide powder and sodium dihydrogen phosphate are added into liquor B made from step 1),
The additive amount of the aqueous solution of calcium hydroxide powder and sodium dihydrogen phosphate is controlled until the pH of mixing liquid C is 9~11 and mixed liquor
K in body C+Substance amount: PO4 3-Substance amount: Ca2+Substance amount=1:(1~1.5): (2~4), while be added while stir
Mix, the sediment occurred in liquid C to be mixed no longer increase after stop stirring, stop stirring after mixing liquid C is stood so that
Sediment standing sedimentation therein is filtered to obtain the sediment C of hygrometric state and liquor C after standing sedimentation；
4) the sediment C of hygrometric state made from step 3) is subjected to drying granulation, gained particle C is slow-release phosphorus potassium complex fertilizer.
2. the method according to claim 1 for recycling n-p-k element from urine sewage, which is characterized in that step 1)
In, Mg in the urine sewage2+Content be 40~80mg/L, NH4 +Content be 4000~6000mg/L, the content of TP is
200~500mg/L, K+Content be 1500~3000mg/L.
3. the method according to claim 1 for recycling n-p-k element from urine sewage, which is characterized in that step 1)
In, mixing time be 10min~15min, mixing speed be 90r/min~120r/min, the standing sedimentation time be 20min~
30min。
4. the method according to claim 1 for recycling n-p-k element from urine sewage, which is characterized in that step 3)
In, mixing time be 30min~40min, mixing speed be 200r/min~300r/min, the standing sedimentation time be 30min~
40min。
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| CN201910712142.3A CN110316713A (en) | 2019-08-02 | 2019-08-02 | A method of recycling n-p-k element from urine sewage |
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| CN201910712142.3A CN110316713A (en) | 2019-08-02 | 2019-08-02 | A method of recycling n-p-k element from urine sewage |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1099943A (en) * | 1977-11-28 | 1981-04-28 | Richard R. Davidson | Treatment of animal waste to produce materials for use in fodder and on the land |
| CN101811687A (en) * | 2010-05-11 | 2010-08-25 | 沈阳建筑大学 | Method for recovering and removing nitrogen and phosphor in urine by ammoniomagnesium phosphate crystal method |
| CN102167434A (en) * | 2011-02-15 | 2011-08-31 | 常州大学 | Method for recovering nitrogen and phosphorous from urine |
| CN102229506A (en) * | 2011-04-08 | 2011-11-02 | 清华大学 | Method for recovering phosphorus and potassium from urine effluent and producing slow-release composite fertilizer of phosphorus and potassium |
| CN103482824A (en) * | 2013-09-18 | 2014-01-01 | 西安建筑科技大学 | Method and device for quickly recycling nitrogen and phosphorus nutrient substances in urine |
| CN104973919A (en) * | 2014-04-11 | 2015-10-14 | 清华大学 | Method of recycling nitrogen and phosphorus in urine to prepare slow-release fertilizer |
-
2019
- 2019-08-02 CN CN201910712142.3A patent/CN110316713A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1099943A (en) * | 1977-11-28 | 1981-04-28 | Richard R. Davidson | Treatment of animal waste to produce materials for use in fodder and on the land |
| CN101811687A (en) * | 2010-05-11 | 2010-08-25 | 沈阳建筑大学 | Method for recovering and removing nitrogen and phosphor in urine by ammoniomagnesium phosphate crystal method |
| CN102167434A (en) * | 2011-02-15 | 2011-08-31 | 常州大学 | Method for recovering nitrogen and phosphorous from urine |
| CN102229506A (en) * | 2011-04-08 | 2011-11-02 | 清华大学 | Method for recovering phosphorus and potassium from urine effluent and producing slow-release composite fertilizer of phosphorus and potassium |
| CN103482824A (en) * | 2013-09-18 | 2014-01-01 | 西安建筑科技大学 | Method and device for quickly recycling nitrogen and phosphorus nutrient substances in urine |
| CN104973919A (en) * | 2014-04-11 | 2015-10-14 | 清华大学 | Method of recycling nitrogen and phosphorus in urine to prepare slow-release fertilizer |
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