CN101811687A - Method for recovering and removing nitrogen and phosphor in urine by ammoniomagnesium phosphate crystal method - Google Patents

Method for recovering and removing nitrogen and phosphor in urine by ammoniomagnesium phosphate crystal method Download PDF

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Publication number
CN101811687A
CN101811687A CN 201010168444 CN201010168444A CN101811687A CN 101811687 A CN101811687 A CN 101811687A CN 201010168444 CN201010168444 CN 201010168444 CN 201010168444 A CN201010168444 A CN 201010168444A CN 101811687 A CN101811687 A CN 101811687A
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China
Prior art keywords
urine
phosphate crystal
nitrogen
ammoniomagnesium phosphate
reclaims
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傅金祥
王智
唐玉兰
赵玉华
马兴冠
由昆
张荣新
周东旭
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Shenyang Jianzhu University
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Shenyang Jianzhu University
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Abstract

The invention discloses a method for recovering and removing nitrogen and phosphor in urine by an ammoniomagnesium phosphate crystal method, relating to a method for recovering and removing the nitrogen and phosphor in urine and recovering the reaction product of the urine through urine source separation. The method for recovering and removing the nitrogen and phosphor comprises the following steps: evenly stirring the urine, regulating the pH value of the urine by utilizing NaOH solution the mass fraction of which is 10%, adding reaction precipitant, stirring, precipitating, filtering and drying to obtain the ammoniomagnesium phosphate crystal. Therefore, nitrogen and phosphor load on domestic sewage is reduced, and the product can also be utilized as manure for agriculture, so the method of the invention is a sustainable sewage disposal technology.

Description

The ammoniomagnesium phosphate crystal method reclaims, removes the method for nitrogen phosphorus in the urine
Technical field
The present invention relates to ecological sanitation sewage recycling technical field, particularly a kind of ammoniomagnesium phosphate crystal method reclaims, removes the method for nitrogen phosphorus in the urine.
Background technology
" ecological sanitation " is a kind of in ecology and the sewage management and the sanitation system that all embody the sustainability characteristics economically, is intended to promote the existing sewage and the collection of refuse, the brand-new ecological economy theory that treatment system develops towards continuable " recycling economy " direction.Traditional municipal sewage treatment is to comprise fecaluria in interior various sanitary sewage combination treatment, consequently to cause sewage to have very high nitrogen and phosphorus load, is difficult to effectively be removed by treating processess such as conventional activated sludge methods.After nitrogen phosphorus is removed halfway treating water and entered water body, can cause the water nutrition thing to exceed standard, body eutrophication takes place.On the other hand, nutritive substances such as nitrogen, phosphorus were exactly the important component of fertilizer originally, had the value of recycling.Yet the urine that present water exhaust system is high with concentration of nitrogen and phosphorus is mixed discharge with other sewage, makes nutritive ingredient obtain dilution, has been difficult in the sewage treatment process and has reclaimed.The invention is intended to find out and a kind ofly handle and the sewage recycling theory, urine is carried out the method handled on the source, nutritive substance such as nitrogen phosphorus in the recovery urine according to distributing.
Urine is a kind of mixing solutions of complexity, contain the ammonia nitrogen and the phosphoric acid salt of high density, and nutritive substances such as nitrogen phosphorus is the important component of fertilizer, have the value of recycling.Nitrogen and phosphorus account for about 80% and 50% of nitrogen in the municipal effluent, phosphorus load respectively in the urine, and its volume is less than 1% of the total discharge volume of sanitary sewage.If urine is direct and the sanitary sewage dual disposal, phosphorus and nitrogen is run off and the nitrogen and phosphorus load increase, therefore seek a kind of method of removing phosphorus and nitrogen in the urine that reclaims and have great importance.
Summary of the invention
The objective of the invention is to propose the method that a kind of ammoniomagnesium phosphate crystal method reclaims, removes nitrogen phosphorus in the urine, this method is according to ecological sanitation and sewage recycling theory, separate by the urine source, reclaim and remove nitrogen phosphorus and its reaction product of reuse in the urine, both reduce the sanitary sewage nitrogen and phosphorus load, product can be used for agricultural fertilizer again.
The objective of the invention is to be achieved through the following technical solutions:
The ammoniomagnesium phosphate crystal method reclaims, removes the method for nitrogen phosphorus in the urine, and the urine that this method stirs is after 10% NaOH solution is regulated the pH value of urine with massfraction, add the reaction precipitation agent, stir, post precipitation, filtration, oven dry obtain the ammoniomagnesium phosphate crystal body.
Ammoniomagnesium phosphate crystal method according to claim 1 reclaims, removes the method for nitrogen phosphorus in the urine, it is characterized in that described pH value is 10.
Described ammoniomagnesium phosphate crystal method reclaims, removes the method for nitrogen phosphorus in the urine, and temperature of reaction is 25 ℃~30 ℃.
Described ammoniomagnesium phosphate crystal method reclaims, removes the method for nitrogen phosphorus in the urine, and the described proportioning that adds is n (Mg 2+): n (NH 4 +): n (PO 4 3-)=1.2: 1: 1.06.
Described ammoniomagnesium phosphate crystal method reclaims, removes the method for nitrogen phosphorus in the urine, and described mixing speed is 50-200r/min, and the reaction times is 20-40min.
Described ammoniomagnesium phosphate crystal method reclaims, removes the method for nitrogen phosphorus in the urine, and described sedimentation time is 20-40min.
Described ammoniomagnesium phosphate crystal method reclaims, removes the method for nitrogen phosphorus in the urine, and described reaction precipitation agent is combined as MgCl 26H 2O and Na 2HPO 412H 2O.
Advantage of the present invention and effect are:
Reaction process of the present invention is simple, and is applied widely, and speed of response is fast, simple to operate.Reaction product ammoniomagnesium phosphate crystal body has the nitrogen phosphorus composition similar to composite fertilizer, can be used as the agricultural fertilizer of safety, can also make fodder additives, Scale inhibitors, chemical reagent etc., realize that resource recovery turns waste into wealth, be a kind of water technology of Sustainable development.
Description of drawings
Fig. 1 reclaims product MAP crystal habit photo figure A for the present invention;
Fig. 2 reclaims product MAP crystal habit photo figure B for the present invention;
Fig. 3 is the sedimentary sem photograph A of MAP of the present invention;
Fig. 4 is the sedimentary sem photograph B of MAP of the present invention;
Fig. 5 is the simple and easy schema of crystallization reaction of the present invention.
Embodiment
Fig. 1-4 reclaims product and sedimentary state photo for the present invention, and its readability does not influence the understanding to technical solution of the present invention.
Because C/N is very low in the urine, PO 4 3-Concentration is much larger than 10mg/L and NH 4 +High density can be to the microorganisms restraining effect, so directly adopt biological process can not reach good removal nitrogen phosphorus effect.Ammoniomagnesium phosphate crystal (MAP is called struvite again) method is the technology of a kind of effective removal waste water middle and high concentration ammonia nitrogen and high concentration phosphorus hydrochlorate, by NH in the water 4 +, PO 4 3-And Mg 2+Reaction generates MgNH 4PO 46H 2The O crystallization is through gravity settling isolating a kind of method from waste water.Contain the feasibility that high concentration N-P has determined this method in the urine simultaneously.It can be converted into topmost two kinds of nutrient nitrogens and phosphorus in the urine precipitation simultaneously and be fixed up its product MAP xln, just struvite, of many uses, can be used as agricultural fertilizer etc., realized recovery, reach the sewage recycling purpose nutritive substance.
Quantitatively measure through pretreated urine, accurately measure indexs such as its original nitrogen and phosphorus content, pH, because the ammonia nitrogen value is far above phosphorus content in the urine, and theoretical reaction N/P ratio is 1: 1, so need add a certain amount of phosphorus source (accurately calculating the value of adding according to original nitrogen phosphorus value).By the single-factor influence test, the factors such as pH value, temperature of reaction, reactant ratio, stirring velocity, reaction times and heavyization time of investigating are removed nitrogen phosphorus influence in the urine to reclaiming, and draw optimum reaction condition.
The urine of stirring and evenly mixing is that 10% NaOH solution is the pH regulator agent with massfraction, regulates the pH value of urine with the automatical potentiometric titrimeter that has pH load electrode, adds reaction precipitation agent Na successively by definite amount of substance proportioning 2HPO 412H 2O (because freshly voided urine nitrogen phosphorus mol ratio is much larger than 1, thus must add a certain amount of phosphorus source reach denitrogenate purpose) and MgCl 26H 2O stirs, and after certain reaction time and the sedimentation time, filtration, oven dry obtain xln, forms and urine nitrogen phosphorus recovery clearance and residual quantity by SEM and XRD analysis throw out.To the research of reaction conditions single-factor influence, draw MAP method optimum recovery and remove nitrogen phosphorus reaction condition in the urine.
MAP crystalline deposit method main chemical reactions is:
Mg 2++PO 4 3-+NH 4 ++6H 2O=MgNH 4PO 4·6H 2O↓(Ksp=2.51×10 -1325℃)
Described optimal ph is 10;
Described optimal reaction temperature is 25 ℃~30 ℃, can take room temperature;
Described optimum response thing dosing ratio n (Mg 2+): n (NH 4 +): n (PO 4 3-)=1.2: 1: 1.06;
Described optimum response rotating speed is 50-200r/min;
Described optimum reacting time is 20-40min;
Described heavyization of the best time is 20-40min;
Described optimum response precipitation agent is combined as MgCl 26H 2O and Na 2HPO 412H 2O.
Before urine enters water drain, at first carry out the technology that separated and collected is handled reuse then, can effectively improve the effluent quality of present sewage work on the one hand, and save energy consumption and investment, can also realize the recycle of nutritive substance on the other hand.The ammoniomagnesium phosphate crystal method can effectively be removed and reclaim nitrogen phosphorus in the urine, and its product can be used as agricultural fertilizer, and certain marketable value is arranged, and reduce the MAP crystallization process generally and handled the input of urine on medicament, be feasible economically.

Claims (7)

1. the ammoniomagnesium phosphate crystal method reclaims, removes the method for nitrogen phosphorus in the urine, it is characterized in that the urine that this method stirs, and is after 10% NaOH solution is regulated the pH value of urine with massfraction, add the reaction precipitation agent, stir, post precipitation, filtration, oven dry obtain the ammoniomagnesium phosphate crystal body.
2. ammoniomagnesium phosphate crystal method according to claim 1 reclaims, removes the method for nitrogen phosphorus in the urine, it is characterized in that described pH value is 10.
3. ammoniomagnesium phosphate crystal method according to claim 1 reclaims, removes the method for nitrogen phosphorus in the urine, it is characterized in that temperature of reaction is 25 ℃~30 ℃.
4. ammoniomagnesium phosphate crystal method according to claim 1 reclaims, removes the method for nitrogen phosphorus in the urine, it is characterized in that the described proportioning that adds is n (Mg 2+): n (NH 4 +): n (PO 4 3-)=1.2: 1: 1.06.
5. ammoniomagnesium phosphate crystal method according to claim 1 reclaims, removes the method for nitrogen phosphorus in the urine, it is characterized in that described mixing speed is 50-200r/min, and the reaction times is 20-40min.
6. ammoniomagnesium phosphate crystal method according to claim 1 reclaims, removes the method for nitrogen phosphorus in the urine, it is characterized in that described sedimentation time is 20-40min.
7. ammoniomagnesium phosphate crystal method according to claim 1 reclaims, removes the method for nitrogen phosphorus in the urine, it is characterized in that described reaction precipitation agent is combined as MgCl 26H 2O and Na 2HPO 412H 2O.
CN 201010168444 2010-05-11 2010-05-11 Method for recovering and removing nitrogen and phosphor in urine by ammoniomagnesium phosphate crystal method Pending CN101811687A (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102139975A (en) * 2011-02-22 2011-08-03 南京大学 Method for recovering phosphorus in crystallization way from semiconductor industrial waste water
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
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
CN109734214A (en) * 2019-03-07 2019-05-10 南开大学 A method of recovery of nitrogen and phosphorus and synchronous absorption beta blocker in Heisui River are realized using pH regulating device
CN110316713A (en) * 2019-08-02 2019-10-11 山东众森固废资源循环利用研究院有限公司 A method of recycling n-p-k element from urine sewage
CN110407358A (en) * 2019-07-25 2019-11-05 刘辉 A kind of method and device of recycling treatment source separation yellow water
CN112979352A (en) * 2021-03-08 2021-06-18 亚太建设科技信息研究院有限公司 Method for recovering phosphate in urine
CN113716997A (en) * 2020-05-26 2021-11-30 中国科学院大学 Struvite coated slow release fertilizer and preparation method thereof

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1328183C (en) * 2006-05-24 2007-07-25 湖南大学 Method for recovering nitrogen and phosphorus from sewage

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1328183C (en) * 2006-05-24 2007-07-25 湖南大学 Method for recovering nitrogen and phosphorus from sewage

Non-Patent Citations (2)

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Title
《给水排水》 20061231 邹安华 等 污水处理厂回流液中回收磷酸铵镁的试验研究 第115-118页 1-7 第32卷, 2 *
《辽宁化工》 20091130 王智 等 MAP沉淀法回收去除尿液中氮磷的影响因素分析 第822-824页 1-7 第38卷, 第11期 2 *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102139975A (en) * 2011-02-22 2011-08-03 南京大学 Method for recovering phosphorus in crystallization way from semiconductor industrial waste water
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
CN102229506B (en) * 2011-04-08 2013-09-04 清华大学 Method for recovering phosphorus and potassium from urine effluent and producing slow-release composite fertilizer of phosphorus and potassium
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
CN104973919B (en) * 2014-04-11 2018-01-16 清华大学 The method that nitrogen phosphorus prepares slow-release fertilizer in recovery urine
CN109734214A (en) * 2019-03-07 2019-05-10 南开大学 A method of recovery of nitrogen and phosphorus and synchronous absorption beta blocker in Heisui River are realized using pH regulating device
CN110407358A (en) * 2019-07-25 2019-11-05 刘辉 A kind of method and device of recycling treatment source separation yellow water
CN110316713A (en) * 2019-08-02 2019-10-11 山东众森固废资源循环利用研究院有限公司 A method of recycling n-p-k element from urine sewage
CN113716997A (en) * 2020-05-26 2021-11-30 中国科学院大学 Struvite coated slow release fertilizer and preparation method thereof
CN112979352A (en) * 2021-03-08 2021-06-18 亚太建设科技信息研究院有限公司 Method for recovering phosphate in urine

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Open date: 20100825