CN110240242A - A method of gypsum being recycled except ammonia and simultaneously using guanite circulation - Google Patents

A method of gypsum being recycled except ammonia and simultaneously using guanite circulation Download PDF

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Publication number
CN110240242A
CN110240242A CN201910330073.XA CN201910330073A CN110240242A CN 110240242 A CN110240242 A CN 110240242A CN 201910330073 A CN201910330073 A CN 201910330073A CN 110240242 A CN110240242 A CN 110240242A
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solid
guanite
ammonia
ammonia nitrogen
water
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CN201910330073.XA
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CN110240242B (en
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黄海明
丁丽
赵宁
李晶
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Dongguan University of Technology
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Dongguan University of Technology
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F11/00—Compounds of calcium, strontium, or barium
    • C01F11/46—Sulfates
    • 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
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • C02F1/5254—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using magnesium compounds and phosphoric acid for removing ammonia
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/04—Flow arrangements
    • C02F2301/043—Treatment of partial or bypass streams

Abstract

The present invention relates to a kind of methods for recycling gypsum except ammonia and simultaneously using guanite circulation.This method comprises the following steps: S1: calcium hydroxide and guanite is soluble in water, it is evaporated in heating stirring down toward water, obtains solid；S2: solid is soluble in water, and stirring is added sulfuric acid, obtains solidliquid mixture；S3: after taking supernatant to be added to and handled in ammonia nitrogen waste water after solidliquid mixture is separated, after being separated by solid-liquid separation separation, the solid cleaned is gypsum；S4: being added ammonia nitrogen waste water in the supernatant after being separated by solid-liquid separation into S3, stirs, and magnesia is added, and stands and is separated by solid-liquid separation, obtained solid is guanite, the source as guanite in S1；S5: repeating S1~S4, i.e., recyclable to remove ammonia and recycle gypsum simultaneously.Ammonia nitrogen waste water is handled using method of the invention, water outlet ammonia nitrogen concentration is stablized, and for ammonia nitrogen removal frank up to 90% or more, water outlet phosphorus concentration is less than 1mg/L, also recyclable to obtain the gypsum product of high-purity.

Description

A method of gypsum being recycled except ammonia and simultaneously using guanite circulation
Technical field
The invention belongs to environmental technology fields, and in particular to a kind of that gypsum is recycled except ammonia and simultaneously using guanite circulation Method.
Background technique
Currently, the major issue that China's Water ecoenvironment faces is ammonia nitrogen discharge amount far beyond receiving water body Environmental carrying capacity, ammonia nitrogen more than COD become influence China's surface water environment quality primary pollutant.According to 2013 " in State's environmental statistics annual report " it shows, ammonia nitrogen discharge amount is equivalent to receiving water body environmental carrying capacity up to 245.7 ten thousand tons in national waste water Nearly 8 times.Ammonia nitrogen (NH3And NH4 +) it is water ecological environment to be influenced and endangered in all kinds of nitrogenous compounds maximum a kind of there are shapes State is more extensive to the harm of water body, complicated and lasting compared with the nitrogen of other forms.And in following a very long time, China will be in urbanization and industrialization " double quick speed " developing stage, and pollutant emission incremental pressure is huge, needs to improve ammonia Nitrogen wastewater processing technology is horizontal.
Currently, the ammonia nitrogen processing method industrially applied mainly has bioanalysis and chemical method two major classes.Bioanalysis denitrogenation is most Pipe can efficiently remove ammonia nitrogen, but the technology is influenced by factors such as the concentration, water temperature, carbon source of ammonia nitrogen in waste water, is often needed Stringent operational management is wanted to can be only achieved preferably except ammonia effect.Chemical method mainly has ammonia aeration, breakpoint chlorination, guanite except ammonia Precipitating etc..Ammonia aeration is commonly used in the processing of high-concentration ammonia nitrogenous wastewater, although its deamination works well, winter low water temperature is to de- The influence of ammonia effect, the fouling of stripping tower and ammonia nitrogen are the problem of technology can not avoid to the secondary pollution of air；Break chlorine Change is generally used for Low Concentration Ammonia Containing Wastewater processing or drinking water disinfection, which causes due to being easy to produce to have in application process The chlorine-containing organic compounds of cancer effect, the less industrial treatment for waste water.Guanite precipitating is in recent years by the country A kind of efficient waste water ammonia-removal technology that outer scholar studies extensively.The technology is compared with bioanalysis, ammonia aeration and breakpoint chlorination, no There are disadvantages mentioned above, and have it is easy to operate, be swift in response many advantages, such as good with product precipitation and separation performance, be that one kind has The waste water ammonia-removal technology of applications well prospect.
Guanite (Magnesium Ammonium Phosphate, MAP), molecular formula MgNH4PO4·6H2O is one The white crystalline material of kind indissoluble.As Mg in solution2+,NH4 +And PO4 3–Ion concentration reaches a threshold value, and is in appropriate pH When value range (9-10.7) is interior, by following reaction formula spontaneous nucleation can occur for MAP, to reach the mesh of ammonia nitrogen in removal waste water 's.
Mg2++NH4 ++HPO4 2–+6H2O→MgNH4PO4·6H2O↓+H+
Now studies have reported that having proven to receive preferable deamination using all kinds of ammonia nitrogen waste waters of guanite precipitation method processing Effect.However, regrettably, often needing to add a large amount of phosphorus and magnesium salts and alkali during guanite sinks ammonia, just can guarantee The efficient removal of ammonia nitrogen, this makes guanite precipitating except ammonia cost is excessively high, seriously affects its economic feasibility, constrain the technology Popularization and application.
Currently, reducing guanite precipitation process cost mainly recycles two kinds of ways by using cheap magnesium source and guanite Diameter is realized.However, the amplitude for regrettably reducing guanite precipitation process cost using cheap magnesium source is extremely limited.There is document point Analysis shows that under the premise of not considering energy consumption and cost of human resources, the cost of guanite precipitating is mainly tried by phosphorus, magnesium salts and alkali Agent (NaOH) three parts cost structure, they account for 81%, 10% and the 9% of totle drilling cost respectively.Therefore, bird is greatly reduced Coprolite precipitation process cost, recycle phosphorus and magnesium in guanite be then must be by approach.
Traditional guanite circulation utilization method is mainly realized by NaOH pyrolysis and high-temperature direct thermal solution two ways.It is high Warm directly pyrolysis is to release the circulation benefit that ammonia reaches phosphorus and magnesium by high temperature using the unstability of guanite under the high temperature conditions With.The effective active product of the method for pyrolysis is MgHPO4, but under the high temperature conditions, guanite decomposition product ingredient is very multiple It is miscellaneous.Some researches show that guanites to be pyrolyzed in 100-800 DEG C of ranges, and decomposition product contains that whether there is or not the pairs of any ammonia nitrogen removal performance Product Mg2P2O7, and as the raising of pyrolysis temperature and the extension of the pyrolysis time by-products content are gradually increased.In addition, birds droppings There is also resolving times long (being greater than 2.5h) and thermal decomposition product except ammonia performance is with recycling number increase for stone high-temperature direct thermal solution And the problem of quickly reducing.Existing research achievement shows that guanite sodium hydroxide decomposes higher temperatures and is directly pyrolyzed with obvious excellent Gesture, is mainly reflected in that its decomposition temperature is low, and high-efficient and product component is more single.Although guanite sodium hydroxide decompose relative to Its high-temperature direct thermal solution can effectively reduce by-products content, but use the circulation utilization method, as product recycles number Increase, the deamination effect of guanite thermal decomposition product gradually decreases, this, which is primarily due to the NaOH decomposition in solid-solid system, can still produce Raw by-product Mg2P2O7, and it is easy to happen accumulation, cause ammonia removal efficiency to reduce；Secondly, guanite sodium hydroxide decomposes equally There is a problem of that the resolving time is too long, greatly constrains its practical application in industry.
To sum up, current traditional guanite pyrolysis cyclical using main problem existing for method is easily produced in its decomposable process Raw by-product Mg2P2O7And the resolving time is too long, exists simultaneously the big problem of NaOH consumption.
Therefore, develop it is a kind of using guanite circulation except ammonia new process to realize preferable circulating effect, reduce cost With important research significance and economic value.
Summary of the invention
It is an object of the invention to overcome existing guanite circulation utilization method to exist to be also easy to produce by-product Mg2P2O7And point Solve overlong time, exist simultaneously NaOH consumption big defect or deficiency, provide it is a kind of using guanite circulation except ammonia and simultaneously The method for recycling gypsum.Ammonia nitrogen waste water is handled using method provided by the invention, water outlet ammonia nitrogen concentration is stablized, and ammonia nitrogen removal frank can Up to 90% or more, water outlet phosphorus concentration is less than 1mg/L；In addition, the present invention is decomposed without using sodium hydroxide, while without A large amount of phosphorus is put into, guanite disaggregated cost is greatly saved；The generation for avoiding by-product simultaneously, can make full use of birds droppings Stone repeatedly still removes ammonia effect with excellent after circulation；Meanwhile the present invention also can be recycled and obtain the gypsum product of high-purity.This The method circulation of invention is consistent reliable except ammonia, and easy to operate, engineering investment cost is low, and processing cost is low, can be used for various The pretreatment of type ammonia nitrogen waste water.
For achieving the above object, the present invention adopts the following technical scheme:
A method of gypsum being recycled except ammonia and simultaneously using guanite circulation, is included the following steps:
S1: being 0.75~3:1 by calcium hydroxide and the guanite molar ratio soluble in water for making Ca and P, in heating stirring It is evaporated down toward water, obtains solid, be collected simultaneously the vapor and ammonia of evaporation；
Guanite can occur to react as follows with calcium hydroxide:
6MgNH4PO4·6H2O+3Ca(OH)2→Ca3(PO4)2↓+6NH3+2Mg3(PO4)2↓+36H2O
Solid is mainly Ca3(PO4)2And Mg3(PO4)2。
Ammonium hydroxide will be obtained after the vapor and ammonia condensation of recycling.
S2: solid is soluble in water, stirring, it is 1~3 that sulphur acid for adjusting pH, which is added, obtains solidliquid mixture；
Solid can occur to react as follows with sulfuric acid:
Ca3(PO4)2+3H2SO4→CaSO4↓+2H++2H2PO4 -
Mg3(PO4)2+3H2SO4→3Mg2++3SO4 2-+2H++2H2PO4 -
Due to CaSO4It for micro-soluble material, therefore is mainly the Mg of ionic state in supernatant2+、H2PO4 -, for recyclable removal The activated product of ammonia nitrogen.
S3: after taking supernatant to be added to and handled in ammonia nitrogen waste water after solidliquid mixture is separated, it is separated by solid-liquid separation separation Afterwards, the solid cleaned is gypsum；
S4: it is added in ammonia nitrogen waste water in the supernatant after being separated by solid-liquid separation into S3 and makes NH4The molar ratio of-N and P is 0.8 ~1:1, stirring, it is 8~9.5 that base reagent, which is added, to pH, stands, is separated by solid-liquid separation, obtained solid is guanite, as in S1 The source of guanite；The base reagent is one or more of magnesia, magnesium hydroxide or sodium hydroxide；
MgO+2H+→Mg2++H2O；
Or Mg (OH)2+2H+→Mg2++2H2O
Or NaOH+H+→Na++H2O
NH4 ++Mg2++HPO4 2-→MgNH4PO4·6H2O↓+H+
The removal of ammonia nitrogen in waste water can be realized in above-mentioned reaction, and the guanite solid of formation then may return to the progress of S1 step It decomposes, to recycle.
S5: repeating S1~S4, i.e., recyclable to remove ammonia and recycle gypsum simultaneously.
Ammonia nitrogen waste water is handled using method provided by the invention, water outlet ammonia nitrogen concentration is stablized, and ammonia nitrogen removal frank is up to 90% More than, water outlet phosphorus concentration is less than 1mg/L；In addition, the present invention is decomposed without using sodium hydroxide, while big without investment The phosphorus of amount greatly saves guanite disaggregated cost；The generation for avoiding by-product simultaneously, can make full use of guanite, repeatedly Ammonia effect still is removed with excellent after circulation；Meanwhile the present invention also can be recycled and obtain the gypsum product of high-purity.Side of the invention Method circulation is consistent reliable except ammonia, and easy to operate, engineering investment cost is low, and processing cost is low, can be used for various types ammonia nitrogen The pretreatment of waste water.
Preferably, the molar ratio of Ca and P is 1:1 in S1.
Preferably, it is 1:10~15 that calcium hydroxide and guanite, which are dissolved in water to solid-liquid volume ratio, in S1.
Preferably, it is 2 that pH is adjusted in S2.
Preferably, the concentration of ammonia nitrogen waste water is 50~3000mg/L in S3, with NH4- N meter.
Preferably, NH in S44The molar ratio of-N and P is 0.9:1.
Preferably, it handles in S4 to ammonia nitrogen concentration and is not higher than the 10% of initial concentration, with NH4- N meter.
It is further preferable that processing is to ammonia nitrogen concentration to 45~50mg/L in S4.
Preferably, it is repeated S1~S4 step at least 10 times in S5.
Compared with prior art, the invention has the following beneficial effects:
Ammonia nitrogen waste water is handled using method provided by the invention, water outlet ammonia nitrogen concentration is stablized, and ammonia nitrogen removal frank is up to 90% More than, water outlet phosphorus concentration is less than 1mg/L；In addition, the present invention is decomposed without using sodium hydroxide, while big without investment The phosphorus of amount greatly saves guanite disaggregated cost；The generation for avoiding by-product simultaneously, can make full use of guanite, repeatedly Ammonia effect still is removed with excellent after circulation；Meanwhile the present invention also can be recycled and obtain the gypsum product of high-purity.Side of the invention Method circulation is consistent reliable except ammonia, and easy to operate, engineering investment cost is low, and processing cost is low, can be used for various types ammonia nitrogen The pretreatment of waste water.
Detailed description of the invention
Fig. 1 is the device of the invention flow diagram；Wherein 1 is reactor tank, and 2 be dissolving tank, and 3 is are separated by solid-liquid separation tank, and 4 are Except ammonia tank, 5 be knockout drum, and 6 be ammonia recovery unit, and 7 be gypsum product, and 8 be wastewater supernatant fluid.
Specific embodiment
Below with reference to embodiment, the present invention is further explained.These embodiments are merely to illustrate the present invention rather than limitation The scope of the present invention.Test method without specific conditions in lower example embodiment usually according to this field normal condition or is pressed The condition suggested according to manufacturer；Used raw material, reagent etc., unless otherwise specified, being can be from the business such as conventional market The raw materials and reagents that approach obtains.The variation for any unsubstantiality that those skilled in the art is done on the basis of the present invention And replacement belongs to scope of the present invention.
Embodiment 1
The method of gypsum is recycled except ammonia and simultaneously using guanite circulation the present embodiment provides a kind of, such as Fig. 1, including it is as follows Step.
A, it is that decomposition reaction tank 1 is added in 0.75:1 by Ca:P molar ratio by calcium hydroxide and guanite, then presses solid-liquid Product starts the agitating device in reactor tank, is sufficiently mixed reactant, while opening in reactor tank than being that clean water is added in 1:10 Heating device, make the complete distilled-to-dryness of aqueous solution therein.The water vapour and ammonia evaporated in reactor tank is from reactor tank outlet Enter in ammonia recovery unit 6 at mouthful and is recovered as ammonium hydroxide.
B, solid after reaction remaining in decomposition reaction tank 1 is transferred to dissolving tank 2, is then 1:3 by solid-liquid volume ratio Clean water is added, starts the agitating device in dissolving tank, is sufficiently mixed reactant, and sulfuric acid solution is added, adjusts pH value of solution In 1 range, stop being stirred to react after pH stablizes.
C, the solidliquid mixture after dissolving tank 2 reacts, which is transferred to, is separated by solid-liquid separation tank 3, and supernatant after separation, which is added to, to be removed Ammonia nitrogen waste water processing is carried out in ammonia tank 4, the solid isolated in knockout drum 3 is by then obtaining high-purity after clean water rinse 99.5% gypsum product 7.
D, the supernatant separated in knockout drum 3 is added to except after ammonia tank 4, by NH4- N:P molar ratio is that ammonia is added in 0.8:1 Nitrogen concentration is the waste water of 500mg/L, starts blender, and magnesia is then added and adjusts pH value of solution to 9 stopping reactions.It is mixed after reaction It closes object and is transferred to knockout drum 5, be separated by solid-liquid separation after standing 1~2 hour, ammonia nitrogen concentration is reduced in processed waste water supernatant 8 48mg/L, for ammonia nitrogen removal frank up to 90.4%, discharge of wastewater enters subsequent processing link, and the solid after separation then backs into decomposition It is decomposed in tank 1.
Step a, b, c, 10 periods of Step d are repeated, ammonia nitrogen removal consideration is held in 90% or more, and the gypsum of recycling is pure Degree is 99% or more.
Embodiment 2
The present embodiment provides a kind of methods for recycling gypsum except ammonia and simultaneously using guanite circulation, include the following steps.
A, it is that decomposition reaction tank 1 is added in 1:1 by Ca:P molar ratio by calcium hydroxide and guanite, then presses solid-liquid volume ratio Clean water is added for 1:15, starts the agitating device in reactor tank, is sufficiently mixed reactant, while opening adding in reactor tank Thermal makes the complete distilled-to-dryness of aqueous solution therein.The water vapour and ammonia evaporated in reactor tank is from reactor tank gas outlet Into being recovered as ammonium hydroxide in ammonia recovery unit 6.
B, solid after reaction remaining in decomposition reaction tank 1 is transferred to dissolving tank 2, is then 1:8 by solid-liquid volume ratio Clean water is added, starts the agitating device in dissolving tank, is sufficiently mixed reactant, and sulfuric acid solution is added, adjusts pH value of solution In 2 ranges, stop being stirred to react after pH stablizes.
C, the solidliquid mixture after dissolving tank 2 reacts, which is transferred to, is separated by solid-liquid separation tank 3, and supernatant after separation, which is added to, to be removed Ammonia nitrogen waste water processing is carried out in ammonia tank 4, the solid isolated in knockout drum 3 is by then obtaining high-purity after clean water rinse 99.3% gypsum product 7.
D, the supernatant separated in knockout drum 3 is added to except after ammonia tank 4, by NH4- N:P molar ratio is that ammonia is added in 0.9:1 Nitrogen concentration is the waste water of 500mg/L, starts blender, and magnesia is then added and adjusts pH value of solution to 9.5 stopping reactions.After reaction Mixture is transferred to knockout drum 5, is separated by solid-liquid separation after standing 1~2 hour, and ammonia nitrogen concentration reduces in processed waste water supernatant 8 To 45mg/L, for ammonia nitrogen removal frank up to 91%, discharge of wastewater enters subsequent processing link, and the solid after separation then backs into decomposition It is decomposed in tank 1.
Step a, b, c, 10 periods of Step d are repeated, ammonia nitrogen removal consideration is held in 90% or more, and the gypsum of recycling is pure Degree is 99% or more.
Embodiment 3
The present embodiment provides a kind of methods for recycling gypsum except ammonia and simultaneously using guanite circulation, include the following steps.
A, it is that decomposition reaction tank 1 is added in 3:1 by Ca:P molar ratio by calcium hydroxide and guanite, then presses solid-liquid volume ratio Clean water is added for 1:15, starts the agitating device in reactor tank, is sufficiently mixed reactant, while opening adding in reactor tank Thermal makes the complete distilled-to-dryness of aqueous solution therein.The water vapour and ammonia evaporated in reactor tank is from reactor tank gas outlet Into being recovered as ammonium hydroxide in ammonia recovery unit 6.
B, solid after reaction remaining in decomposition reaction tank 1 is transferred to dissolving tank 2, is then 1:10 by solid-liquid volume ratio Clean water is added, starts the agitating device in dissolving tank, is sufficiently mixed reactant, and sulfuric acid solution is added, adjusts pH value of solution In 3 ranges, stop being stirred to react after pH stablizes.
C, the solidliquid mixture after dissolving tank 2 reacts, which is transferred to, is separated by solid-liquid separation tank 3, and supernatant after separation, which is added to, to be removed Ammonia nitrogen waste water processing is carried out in ammonia tank 4, the solid isolated in knockout drum 3 is by then obtaining high-purity after clean water rinse 99.6% gypsum product 7.
D, the supernatant separated in knockout drum 3 is added to except after ammonia tank 4, by NH4- N:P molar ratio is that ammonia nitrogen is added in 1:1 Concentration is the waste water of 500mg/L, starts blender, and magnesia is then added and adjusts pH value of solution to 8 stopping reactions.It is mixed after reaction Object is transferred to knockout drum 5, is separated by solid-liquid separation after standing 1~2 hour, ammonia nitrogen concentration is reduced in processed waste water supernatant 8 50mg/L, for ammonia nitrogen removal frank up to 90%, discharge of wastewater enters subsequent processing link, and the solid after separation then backs into decomposition tank It is decomposed in 1.
Step a, b, c, 10 periods of Step d are repeated, ammonia nitrogen removal consideration is held in 90% or more, and the gypsum of recycling is pure Degree is 99% or more.
Those of ordinary skill in the art will understand that embodiment here be to help reader understand it is of the invention Principle, it should be understood that protection scope of the present invention is not limited to such specific embodiments and embodiments.This field it is common Technical staff disclosed the technical disclosures can make the various various other tools for not departing from essence of the invention according to the present invention Body variations and combinations, these variations and combinations are still within the scope of the present invention.

Claims (9)

1. a kind of method for recycling gypsum except ammonia and simultaneously using guanite circulation, which comprises the steps of:
S1: by calcium hydroxide and the guanite molar ratio soluble in water for making Ca and P be 0.75~3:1, in heating stirring down toward Water is evaporated, and obtains solid, is collected simultaneously the vapor and ammonia of evaporation；
S2: solid is soluble in water, stirring, it is 1~3 that sulphur acid for adjusting pH, which is added, obtains solidliquid mixture；
S3: after taking supernatant to be added to and handled in ammonia nitrogen waste water after solidliquid mixture is separated, after being separated by solid-liquid separation separation, clearly The solid washed is gypsum；
S4: it is added in ammonia nitrogen waste water in the supernatant after being separated by solid-liquid separation into S3 and makes NH4The molar ratio of-N and P is 0.8~1:1, Stirring, it is 8~9.5 that base reagent, which is added, to pH, stands, is separated by solid-liquid separation, obtained solid is guanite, as guanite in S1 Source；The base reagent is one or more of magnesia, magnesium hydroxide or sodium hydroxide；
S5: repeating S1~S4, i.e., recyclable to remove ammonia and recycle gypsum simultaneously.
2. method according to claim 1, which is characterized in that the molar ratio of Ca and P is 1:1 in S1.
3. method according to claim 1, which is characterized in that calcium hydroxide and guanite are dissolved in water to solid-liquid volume ratio in S1 For 1:10~15.
4. method according to claim 1, which is characterized in that adjusting pH in S2 is 2.
5. method according to claim 1, which is characterized in that the concentration of ammonia nitrogen waste water is 50~3000mg/L in S3, with NH4- N meter.
6. method according to claim 1, which is characterized in that NH in S44The molar ratio of-N and P is 0.9:1.
7. method according to claim 1, which is characterized in that handled in S4 to ammonia nitrogen concentration not higher than initial concentration 10%, with NH4- N meter.
8. method according to claim 7, which is characterized in that processing is to ammonia nitrogen concentration to 45~50mg/L in S4.
9. requiring 1 the method according to power, which is characterized in that repeated S1~S4 step at least 10 times in S5.
CN201910330073.XA 2019-04-23 2019-04-23 Method for circularly removing ammonia and simultaneously recycling gypsum by using struvite Active CN110240242B (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1623924A (en) * 2003-12-04 2005-06-08 中国科学院生态环境研究中心 Process for removing ammonia of treating waste water containing high contentrition ammonia
CN101190809A (en) * 2006-11-30 2008-06-04 中国石油化工股份有限公司 Method for treating ammonia nitrogen waste water
US20100282674A1 (en) * 2009-05-07 2010-11-11 Phillip Barak Phosphate Recovery From Acid Phase Anaerobic Digesters
CN102336504A (en) * 2011-09-05 2012-02-01 同济大学 Struvite circulating crystallization method for treating synthetic ammonia wastewater
CN103193370A (en) * 2013-03-30 2013-07-10 中山大学 Phosphorus recovery device for excess sludge
CN104098077A (en) * 2013-04-10 2014-10-15 中国科学院城市环境研究所 Method for improving struvite purity in phosphorus recovery of livestock and poultry culture wastewater

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1623924A (en) * 2003-12-04 2005-06-08 中国科学院生态环境研究中心 Process for removing ammonia of treating waste water containing high contentrition ammonia
CN101190809A (en) * 2006-11-30 2008-06-04 中国石油化工股份有限公司 Method for treating ammonia nitrogen waste water
US20100282674A1 (en) * 2009-05-07 2010-11-11 Phillip Barak Phosphate Recovery From Acid Phase Anaerobic Digesters
CN102336504A (en) * 2011-09-05 2012-02-01 同济大学 Struvite circulating crystallization method for treating synthetic ammonia wastewater
CN103193370A (en) * 2013-03-30 2013-07-10 中山大学 Phosphorus recovery device for excess sludge
CN104098077A (en) * 2013-04-10 2014-10-15 中国科学院城市环境研究所 Method for improving struvite purity in phosphorus recovery of livestock and poultry culture wastewater

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