CN1453222A - Dephosphorizing crystal seed for porous haydite and its prepn - Google Patents
Dephosphorizing crystal seed for porous haydite and its prepn Download PDFInfo
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- CN1453222A CN1453222A CN 03131590 CN03131590A CN1453222A CN 1453222 A CN1453222 A CN 1453222A CN 03131590 CN03131590 CN 03131590 CN 03131590 A CN03131590 A CN 03131590A CN 1453222 A CN1453222 A CN 1453222A
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- crystal seed
- dephosphorizing
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- phosphorus
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Abstract
The present invention relates to stuffing for dephosphorizing in waste water crystallizing bed, and is especially one efficient and practical crystal seed for porous haydite. The crystal seed is loaded in porous haydite carrier with one surface layer of calcium phosphate crystal. The preparation process includes the steps of: adding porous haydite into phosphate culture liquid, regulating pH value to 8.5-10 and Ca/P mass ratio to 3-5 and culture for 12-24 hr to obtain dephosphorizing crystal seed in porous haydite. The crystal seed has fast dephosphorizing speed, high dephosphorizing effect, moderate granularity, light weight, high chemical stability, enough mechanical strength, simple culture process and low cost.
Description
One, the technical field
The invention relates to a filler for removing phosphorus from a wastewater crystallization bed, in particular to an efficient and practical crystal seedcultured by porous ceramsite.
Second, background Art
The dephosphorization by crystallization method is to add a solid particle with the structure and surface property similar to that of indissolvable phosphate into the phosphorus-containing wastewater added with calcium salt to destroy the metastable state of the solution, so that the phosphate is crystallized and precipitated at a practical speed, thereby achieving the purpose of dephosphorization. The seed crystal commonly used at present is natural phosphate ore (containing phosphorus and calcium components and having similar crystal lattices of calcium hydroxy phosphate), but has poor mechanical strength, easy crushing and fine mineral powder, is easy to cause the blockage of a crystallization bed in the wastewater treatment process, is easy to be washed away during back washing, and is difficult to popularize and apply in engineering.
Purpose of the invention
1. Technical problem
In order to solve the engineering problem of phosphorus removal by a wastewater crystallization method, the invention provides the porous ceramsite phosphorus removal crystal seed and the preparation method thereof.
2. Technical scheme
The technical scheme adopted by the invention for solving the technical problem is as follows:
the dephosphorizing crystal seed of porous ceramsite uses porous ceramsite as a carrier, and a layer of calcium phosphate crystal layer is cultured on the porous surface. The bulk density of the porous ceramsite used as the seed crystal carrier is 1.5-2.0g/cm3The specific surface area is 8-12m2/g。
The preparation method of the porous ceramsite dephosphorization seed crystal comprises the following steps: the bulk density is 1.5-2.0g/cm3The porous ceramsite is added into a phosphorus culture solution, the pH value is adjusted to 8.5-10, the Ca/P (mass ratio) is 3/1-5/1, and stirring culture is carried out for 12-24 hours, so that the phosphorus removal seed crystal of the porous ceramsite is obtained.
After the ceramsite carrier is added into the solution containing phosphorus and calcium under the condition of proper pH value, the larger specific surface area of the ceramsite carrier is the one which preferentially adsorbs Ca in the solution2+、HPO4 2-、PO4 3-The plasma forms a concentrated layer on the surface, which makes ion deposition [ Ca]possible2+][PO4 3-][OH-]Locally exceeds the solubility product of the calcium phosphate compound, therebyThe surface of the ceramsite forms some amorphous substances rapidly (amorphous means a solid with a crystal structure without good structure, mainly other forms of calcium phosphate compounds, such as CaHPO4·2H2O、Ca4H(PO4)3Etc.) which are more stable than their counterparts in solutionThe crystalline solid is more readily soluble, is a transition form of poorly soluble phosphate crystals, and gradually transforms to a thermodynamically more stable crystal form, ultimately forming the thermodynamically most stable calcium phosphate crystal in the calcium phosphate compound. In the front induction period of the seed crystal culture, the dynamic processes of crystallization, dissolution and crystal transformation exist on the surface of the ceramsite until a layer of stable calcium phosphate crystal is generated on the surface of the ceramsite, the seed crystal culture enters the growth period of the seed crystal from the induction period, and the total reaction formula can be expressed as follows: . Once a stable calcium phosphate crystal layer is formed on the surface of the porous ceramsite, the culture of the porous ceramsite seed crystal is finished, and the seed crystal can be used for removing phosphorus from a crystal bed.
3. Advantageous effects
The invention has the advantages that the porous ceramsite crystal seed has high phosphorus removal speed and good effect when used in a crystallization method, the phosphorus content of the effluent can be lower than the national sewage discharge standard (GB8978-1996), the crystal seed has good mechanical strength, is not easy to break and block, the culture method is simple, and the investment is low.
The cultured porous ceramsite crystal seeds are loaded into a crystallization bed, and phosphorus-containing wastewater passes through the crystallization bed under certain conditions, so that a good phosphorus removal effect can be achieved.
Fourth, detailed description of the invention
Taking porous ceramsite with certain specification (the specific surface is 8-12 m)2(ii) a bulk density of 1.5 to 2.0g/cm3) Culturing in water with pH of 8.5-10 and Ca/P (mass ratio) of 3-5 at a certain stirring speed for 12-24 hr to obtain porous ceramsite crystal seed. When the phosphorus-containing wastewater passes through the porous ceramsite seed crystal under a certain condition, phosphorus and calcium in the water are destabilized under the induction of the porous ceramsite seed crystal and precipitate on the surface of the seed crystal in the form of calcium phosphate crystals, so that the phosphorus in the water is removed, and the phosphorus removal rate can reach more than 80%.
Claims (4)
1. A dephosphorizing crystal seed of porous haydite features that it uses porous haydite as carrier and has a layer of calcium phosphate crystal layer on its porous surface.
2. The dephosphorizing crystal seed of porous ceramsite according to claim 1, wherein the bulk density of the porous ceramsite used as the crystal seed carrier is 1.5-2.0g/cm3The specific surface area is 8-12m2/g。
3. A preparation method of a phosphorus removal crystal seed of porous ceramsite is characterized by comprising the following steps: the bulk density is 1.5-2.0g/cm3The porous ceramsite is added into a phosphorus culture solution, the pH value is adjusted to 8.5-10, and stirring culture is carried out for 12-24 hours, so that the phosphorus-removing crystal seeds of the porous ceramsite are cultured.
4. The method for preparing the dephosphorizing crystal seed of the porous ceramsite according to claim 3, wherein the phosphorus culture solution is a solution of Ca/p-3/1-5/1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031315909A CN1176029C (en) | 2003-05-28 | 2003-05-28 | Dephosphorizing crystal seed for porous haydite and its prepn |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031315909A CN1176029C (en) | 2003-05-28 | 2003-05-28 | Dephosphorizing crystal seed for porous haydite and its prepn |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1453222A true CN1453222A (en) | 2003-11-05 |
| CN1176029C CN1176029C (en) | 2004-11-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031315909A Expired - Fee Related CN1176029C (en) | 2003-05-28 | 2003-05-28 | Dephosphorizing crystal seed for porous haydite and its prepn |
Country Status (1)
| Country | Link |
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| CN (1) | CN1176029C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104016459A (en) * | 2014-06-18 | 2014-09-03 | 无锡市政设计研究院有限公司 | Preparation method and application of filter chamber filter material replacing struvite mineral |
| CN105463434A (en) * | 2015-12-07 | 2016-04-06 | 常熟市中凯仪表有限公司 | Locator of electrical valve |
| CN106587544A (en) * | 2017-02-09 | 2017-04-26 | 山东建筑大学 | Enhanced phosphate removal and sludge reduction type sewage treatment apparatus |
-
2003
- 2003-05-28 CN CNB031315909A patent/CN1176029C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104016459A (en) * | 2014-06-18 | 2014-09-03 | 无锡市政设计研究院有限公司 | Preparation method and application of filter chamber filter material replacing struvite mineral |
| CN104016459B (en) * | 2014-06-18 | 2015-12-09 | 无锡市政设计研究院有限公司 | A kind of preparation method of filter of alternative struvite ore and application thereof |
| CN105463434A (en) * | 2015-12-07 | 2016-04-06 | 常熟市中凯仪表有限公司 | Locator of electrical valve |
| CN106587544A (en) * | 2017-02-09 | 2017-04-26 | 山东建筑大学 | Enhanced phosphate removal and sludge reduction type sewage treatment apparatus |
| CN106587544B (en) * | 2017-02-09 | 2023-03-14 | 山东建筑大学 | Enhanced phosphorus removal and sludge reduction type sewage treatment device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1176029C (en) | 2004-11-17 |
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