CN105084943A - Low-cost waste water phosphorus fertilizer production technology - Google Patents
Low-cost waste water phosphorus fertilizer production technology Download PDFInfo
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- CN105084943A CN105084943A CN201510481033.7A CN201510481033A CN105084943A CN 105084943 A CN105084943 A CN 105084943A CN 201510481033 A CN201510481033 A CN 201510481033A CN 105084943 A CN105084943 A CN 105084943A
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Abstract
The invention provides a low-cost waste water phosphorus fertilizer production technology, and belongs to the field of water pollution control and resource regeneration. A low-cost waste water phosphorus fertilizer production device is composed of four treatment units including a first-stage blowing stripping pond, a first-stage settlement pond, a second-stage blowing stripping reaction pond and a second-stage settlement pond. The technology includes the following steps that biogas slurry waste water from an anaerobic pool is firstly subjected to CO2 blowing stripping in the first-stage blowing stripping pond, and the blowing stripping pH value is controlled; then, the waste water enters the first-stage settlement pond in a self-flowing mode, and suspended organic matter, colloid and part of precipitates are separated and removed; outflow water of the first settlement pond enters the second blowing stripping reaction pond for deep aerated blowing stripping and magnesium ammonium phosphate (MgNH4PO4.6H2O) crystallization reaction, and the pH value of the reaction is controlled; the waste water enters the second-stage settlement pond in a self-flowing mode for gravity settling, solid and liquid are separated, and magnesium ammonium phosphate precipitates are recycled. The waste water phosphorus fertilizer production technology can greatly reduce the amount of alkali thrown during waste water magnesium ammonium phosphate production, and the content of impurities in the product is reduced. Meanwhile, the problem that water pumps, pipe accessories and other facilities scale is effectively solved.
Description
Technical field
The present invention relates to a kind of low cost waste water phosphate fertilizer recovery process method, belong to wastewater treatment and resource technology field thereof.
Background technology
The phosphorus of sanitary sewage and breeding wastewater discharge is the one of the main reasons of body eutrophication, causes serious negative impact, become one of current great environmental problem to quality of water environment.On the other hand, phosphorus is the indispensable nutritive element of all life forms, is also important industrial chemicals, the particularly finiteness of occurring in nature phosphorus ore resource, makes the recycle realizing phosphor resource very necessary.It is the important way alleviating water pollution and phosphor resource shortage that the phosphorus of waste water reclaims.At present, the main technique reclaimed from phosphorus in waste water such as breeding wastewater natural pond liquid, municipal sludge anaerobic supernatants is magnesium ammonium phosphate (MgNH
4pO
46H
2o, is commonly called as struvite) crystalline deposit technique, the magnesium ammonium phosphate of recovery is good slow release fertilizer, can directly apply to agriculture production.
The technique that current magnesium ammonium phosphate reclaims waste water nitrogen phosphorus mainly contains fluidized-bed, crystalline deposit pond, gas stripping type reactor process etc.Although each tool advantage of these magnesium ammonium phosphate recovery process, applying in engineering practice also has very large difficulty, and medicament (alkali consumption, magnesium source) adds cost, reclaims the quality (foreign matter content is high) of product is its main influence factor.For rich phosphorus waste water such as livestock breeding wastewater natural pond liquid, sludge anaerobic supernatant liquors, although the phosphoric acid salt (60-300mg/L) containing higher concentration, carbonate also containing 100-800mg/L, a large amount of alkali (as NaOH) need be added when phosphorus reclaims and abolish carbonate buffer system, pH value is brought up to 8.5-10.5, causes working cost larger; And if alkali dosage controls bad, the inorganic salt precipitation of generation easily causes the scale problems of the facility such as water pump, pipe fitting, affects phosphorus organic efficiency and service life of equipment.In addition, in the liquid of natural pond, the organic content of suspension and colloidality is high, easily mixes with magnesium ammonium phosphate crystal when phosphorus reclaims, and be difficult to separation, cause foreign matter content in product higher, magnesium ammonium phosphate content is lower.Given this, the present invention proposes novel method when waste water magnesium ammonium phosphate is produced, and utilizes CO
2stripping, reduces carbonate content in waste water, is conducive to the dosage reducing alkali, reduces reagent cost; Be conducive to removing suspended solids and organic particulate matter, reduce throw out impurity, reclaim the magnesium ammonium phosphate product of high-quality.
Summary of the invention
When reclaiming for the rich phosphorus phosphorus in waste water such as livestock breeding wastewater natural pond liquid, sludge anaerobic supernatant liquor, need add a large amount of alkali, product foreign matter content is high, the problem of the easy fouling of the facility such as water pump, tube fittings, the invention provides a kind of low cost waste water phosphate fertilizer production technique.Described technical characteristic is as follows:
(1) art breading unit comprises one-level stripping pond, first stage precipitation tank, secondary stripping reaction tank and second-level settling pond.One-level stripping pond and first stage precipitation tank can adopt Round Sump, also can adopt point to build formula; Secondary stripping reaction tank and second-level settling pond can adopt Round Sump, also can adopt point to build formula.
(2) first the natural pond liquid (as livestock breeding wastewater natural pond liquid, sludge anaerobic supernatant liquor etc.) from anaerobic pond carry out CO in one-level stripping pond
2stripping, utilizes online pH Controlling System to monitor pH value changing conditions.When pH value reaches 7.5-8.2, stop stripping immediately.
(3) waste water after stripping, to enter first stage precipitation tank from streamed, carries out suspended organic matter, colloid is separated removal with partly precipitated product.
(4) water outlet of first stage precipitation tank enters secondary stripping reaction tank, carries out deep aeration stripping; Meanwhile, add magnesium source (magnesium chloride, bittern etc.) and alkali, carry out magnesium ammonium phosphate (MgNH
4pO
46H
2o) crystallization reaction, utilizes online pH Controlling System to monitor pH value changing conditions, and controls the dosage of alkali, make pH value in reaction at 8.0-10.5.
(5) water outlet of secondary stripping reaction tank is to enter second-level settling pond from streamed, carries out gravity settling, solid-liquid separation, reclaims magnesium ammonium phosphate sediment thing.
Waste water phosphate fertilizer production technique provided by the present invention, greatly can reduce the alkali number added when phosphorus in waste water reclaims, reduce the content reclaiming impurity in product, effectively solve the problem of the facility such as water pump, tube fittings fouling simultaneously.It is inorganic carbon or carbonate concentration 50-2000mg/L, pH value 5.0-8.0, phosphoric acid salt (in P) 20-500mg/L, suspended solids 50-3000mg/L that technique provided by the invention can process waste water quality.
Embodiment
embodiment 1:
Certain livestock breeding wastewater natural pond liquid, initial pH value 6.5, suspended solids 830mg/L, carbonate 800mg/L, NH
4 +and PO
4 3-concentration is respectively 340mg/L and 93mg/L, adopts this combination process to carry out production of phosphate fertilizer.First waste water is pumped in one-level stripping pond and carry out aeration stripping CO
2, control vapour-liquid ratio 8:1, and utilize online pH Controlling System to monitor pH value changing conditions.When pH value reaches 8.0, stop stripping immediately.Waste water after one-level stripping is to enter first stage precipitation tank from streamed, and that carries out suspended solids and partly precipitated product is separated removal, sedimentation time 90min.The water outlet of first stage precipitation tank enters secondary stripping reaction tank, and carry out deep aeration stripping and ammoniomagnesium phosphate crystal reaction, vapour-liquid ratio 10:1, adds a certain amount of magnesium source MgCl
2, utilize the dosage of online pH Controlling System control NaOH, make stripping reaction tank pH value be stabilized in 9.0.The water outlet in secondary stripping pond is to enter second-level settling pond from streamed, and then gravity settling, controls sedimentation time 150min and carry out solid-liquid separation, reclaim magnesium ammonium phosphate sediment thing.
embodiment 2:
Certain municipal sludge anaerobic supernatant, initial pH value 7.0, suspended solids 1200mg/L, carbonate 500mg/L, NH
4 +and PO
4 3-concentration is respectively 820mg/L and 150mg/L, adopts this combination process to carry out production of phosphate fertilizer.First waste water is pumped in one-level stripping pond and carry out aeration stripping CO
2, control vapour-liquid ratio 6:1, and utilize online pH Controlling System to monitor pH value changing conditions.When pH value reaches 8.0, stop stripping immediately.Waste water after one-level stripping is to enter first stage precipitation tank from streamed, and that carries out suspended solids and partly precipitated product is separated removal, sedimentation time 60min.The water outlet of first stage precipitation tank enters secondary stripping reaction tank, and carry out deep aeration stripping and ammoniomagnesium phosphate crystal reaction, vapour-liquid ratio 8:1, adds a certain amount of magnesium source MgCl
2, utilize the dosage of online pH Controlling System control NaOH, make stripping reaction tank pH value be stabilized in 8.5.The water outlet in secondary stripping pond is to enter second-level settling pond from streamed, and then gravity settling, controls sedimentation time 120min and carry out solid-liquid separation, reclaim magnesium ammonium phosphate sediment thing.
Claims (6)
1. a low cost waste water phosphate fertilizer production technique, is characterized in that comprising following processing unit: one-level stripping pond, first stage precipitation tank, secondary stripping reaction tank and second-level settling pond; One-level stripping pond and first stage precipitation tank can adopt Round Sump, also can adopt point to build formula; Secondary stripping reaction tank and second-level settling pond can adopt Round Sump, also can adopt point to build formula.
2. a kind of low cost waste water phosphate fertilizer production technique according to claim 1, its technique is carried out according to the following steps: first the natural pond liquid waste water from anaerobic pond carry out CO in one-level stripping pond
2stripping, and the pH value controlling stripping; Then, waste water, to enter first stage precipitation tank from streamed, carries out suspended organic matter, colloid is separated removal with partly precipitated product; The water outlet of first stage precipitation tank enters secondary stripping reaction tank, carries out deep aeration stripping and magnesium ammonium phosphate (MgNH
4pO
46H
2o) crystallization reaction, and the pH value controlling reaction; Afterwards, waste water, to enter second-level settling pond from streamed, carries out gravity settling, solid-liquid separation, reclaims magnesium ammonium phosphate sediment thing.
3. processing method according to claim 2, is characterized in that the pH value adopting on-line pH value Controlling System monitoring one-level stripping pond, when pH value reaches 7.5-8.2, stops stripping immediately.
4. processing method according to claim 2, is characterized in that one-level stripping tank waterpower residence time 1-60min, first stage precipitation tank hydraulic detention time 5-120min, and precipitation forms can be flat flow, radial-flow, vertical-flow, inclined tube (plate) precipitation.
5. processing method according to claim 2, is characterized in that the pH value changing conditions adopting on-line pH value Controlling System monitoring secondary stripping reaction tank, and controls the dosage of alkali, make secondary stripping reaction tank pH value at 8.0-10.0.
6. processing method according to claim 2, it is characterized in that secondary stripping reaction tank vapour-liquid ratio (2-100): 1, hydraulic detention time 10-120min, second-level settling pond hydraulic detention time 10-180min, precipitation forms can be flat flow, radial-flow, vertical-flow, inclined tube (plate) precipitation.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510481033.7A CN105084943A (en) | 2015-08-10 | 2015-08-10 | Low-cost waste water phosphorus fertilizer production technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510481033.7A CN105084943A (en) | 2015-08-10 | 2015-08-10 | Low-cost waste water phosphorus fertilizer production technology |
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|---|---|
| CN105084943A true CN105084943A (en) | 2015-11-25 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105712529A (en) * | 2016-03-29 | 2016-06-29 | 瓮福（集团）有限责任公司 | Method for treating high-concentration acidic wastewater containing fluorine and phosphorus |
| CN106148421A (en) * | 2016-07-13 | 2016-11-23 | 中国科学院青岛生物能源与过程研究所 | A kind of method using solid state fermentation and biogas slurry outer circulation decarburization associating producing methane |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101066822A (en) * | 2007-05-24 | 2007-11-07 | 上海大学 | Combined treatment process for high-concentration ammonia nitrogen waste water |
| CN101633524A (en) * | 2009-06-12 | 2010-01-27 | 中国环境科学研究院 | Process and device for removing and recycling phosphorus in waste water of livestock breeding |
| CN104030488A (en) * | 2014-06-12 | 2014-09-10 | 中国科学院城市环境研究所 | Wastewater phosphorus recovery pretreatment process |
-
2015
- 2015-08-10 CN CN201510481033.7A patent/CN105084943A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101066822A (en) * | 2007-05-24 | 2007-11-07 | 上海大学 | Combined treatment process for high-concentration ammonia nitrogen waste water |
| CN101633524A (en) * | 2009-06-12 | 2010-01-27 | 中国环境科学研究院 | Process and device for removing and recycling phosphorus in waste water of livestock breeding |
| CN104030488A (en) * | 2014-06-12 | 2014-09-10 | 中国科学院城市环境研究所 | Wastewater phosphorus recovery pretreatment process |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105712529A (en) * | 2016-03-29 | 2016-06-29 | 瓮福（集团）有限责任公司 | Method for treating high-concentration acidic wastewater containing fluorine and phosphorus |
| CN106148421A (en) * | 2016-07-13 | 2016-11-23 | 中国科学院青岛生物能源与过程研究所 | A kind of method using solid state fermentation and biogas slurry outer circulation decarburization associating producing methane |
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Application publication date: 20151125 |