CN114377649A - Modified adsorbent for removing COD in secondary effluent and preparation method thereof - Google Patents
Modified adsorbent for removing COD in secondary effluent and preparation method thereof Download PDFInfo
- Publication number
- CN114377649A CN114377649A CN202011111736.8A CN202011111736A CN114377649A CN 114377649 A CN114377649 A CN 114377649A CN 202011111736 A CN202011111736 A CN 202011111736A CN 114377649 A CN114377649 A CN 114377649A
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- China
- Prior art keywords
- ammonium chloride
- modified adsorbent
- diallyl ammonium
- dimethyl diallyl
- secondary effluent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
- B01J20/14—Diatomaceous earth
-
- 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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
-
- 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
- C02F2101/30—Organic compounds
Abstract
The invention discloses a modified adsorbent for removing COD in secondary effluent and a preparation method thereof. The method solves the problems of small adsorption capacity and low adsorption speed of the diatomite, has low cost and easy actual operation, and can remove the residual modified adsorbent by gravity settling.
Description
Technical Field
The invention belongs to the field of sewage treatment, and particularly relates to a modification method of an adsorbent and removal of COD in secondary effluent of a sewage plant.
Background
With the increasingly severe water environment treatment, the emission limit value of COD is lower and lower. COD is a comprehensive index reflecting the organic matter pollution degree in water, and the excessive content of COD can cause aquatic organisms to be anoxic to death, so that the aquatic organisms are rotten and smelly. The treatment of COD is generally carried out by chemical and adsorption methods.
The adsorption is used as a common method for removing pollutants, has wide application and simple use, and can be used for treating pollutants in sewage treatmentThe row is effectively removed. At present, the adsorption materials widely used are various, including sand, ore, anthracite, nut shell, carbon material and the like with granular structures, porous polymeric organic matter membranes with block structures, porous ceramics, porous metals, fiber fabrics and the like. Diatomite is a rich mineral material and widely distributed in China nature, and mainly comprises amorphous SiO2Composition and containing a small amount of Fe2O3And CaO, etc. The adsorbent has the characteristics of soft quality, porosity, light weight, large specific surface area, low price and the like, and is commonly used as an adsorbent in various industrial fields. However, diatomaceous earth has disadvantages such as low adsorption capacity and slow adsorption rate.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a modified adsorbent for removing COD in secondary effluent and a preparation method thereof, solves the problems of long adsorption time and small adsorption capacity of independently used diatomite, and provides a method for modifying the adsorbent by carrying out composite high molecular organic matter poly dimethyl dipropylene ammonium chloride on the surface of the diatomite to realize effective removal of COD in the secondary effluent.
The technical purpose of the invention is realized by the following technical scheme.
A modified adsorbent for removing COD in secondary effluent and a preparation method thereof are carried out according to the following steps: uniformly dispersing diatomite and poly dimethyl diallyl ammonium chloride in a water phase for modification, and drying after modification to obtain solid particles, namely the modified adsorbent; wherein the mass ratio of the diatomite to the poly dimethyl diallyl ammonium chloride is (10-25): 1, the temperature of the modification reaction is 20-50 ℃, and the time of the modification reaction is 1-5 hours.
And the mass ratio of the diatomite to the poly dimethyl diallyl ammonium chloride is (15-25): 1.
the temperature of the modification reaction is 25 to 40 ℃ and the time of the modification reaction is 3 to 5 hours.
Furthermore, mechanical stirring is used to achieve uniform dispersion, with a stirring speed of 100-300 revolutions per minute.
The aqueous phase is ultrapure water.
The polydimethyldiallylammonium chloride has a number average molecular weight of 10000 to 100000, preferably 40000 to 80000.
And the mass percentage of the poly dimethyl diallyl ammonium chloride in the water phase is 0.5-1.5%.
Compared with the prior art, the invention provides the modified diatomite and the method thereof, the poly-dimethyl-dipropyl-diluted ammonium chloride is an organic matter with higher positive charge density, and has the advantages of better solubility, no toxicity, high cost performance and the like, and the diatomite and the poly-dimethyl-dipropyl-diluted ammonium chloride can be compounded to form a stable composite structure by depending on the positive and negative charge action between the diatomite and the poly-dimethyl-dipropyl-diluted ammonium chloride, so that the poly-dimethyl-dipropyl-diluted ammonium chloride is embedded into the lamellar structure of the diatomite, the lamellar spacing of the diatomite is increased, and the adsorption capacity to organic substances can be improved to a great extent. The invention compounds the macromolecular organic compound poly dimethyl diallyl ammonium chloride on the basis of the adsorbent diatomite. After the poly dimethyl diallyl ammonium chloride is compounded, the poly dimethyl diallyl ammonium chloride is embedded into the lamellar structure of the diatomite, the lamellar interval of the diatomite is increased, a better adsorption effect is achieved, the adsorption capacity is increased simultaneously, and a good removal effect is achieved on organic matters. The modified adsorbent is low in cost, and residual modified adsorbent can be removed by gravity settling. The modified diatomite has good effect of removing COD in the secondary effluent, and the removal rate of the COD is 77.61% when the adding amount is 20 mg/L.
Detailed Description
The present invention will be described in further detail with reference to examples. Diatomaceous earth, purchased from Tianjin Sienswick, chemically pure; polydimethyldiallylammonium chloride was purchased from the manufacturer Shanghai Mecline, (number average) molecular weight 100000, purity: 35 wt%.
Example 1: the preparation method of the modified adsorbent comprises the following steps:
(1) preparation of a medicament: the poly dimethyl diallyl ammonium chloride is weighed and dissolved in ultrapure water to prepare a 1% poly dimethyl diallyl ammonium chloride solution. According to the mass ratio of 10: weighing diatomite and dissolving the diatomite in a poly dimethyl diallyl ammonium chloride solution.
(2) The modification process comprises the following steps: and (2) stirring the diatomite and the poly dimethyl diallyl ammonium chloride solution in the step (1) at 40 ℃ for 2 hours, fully mixing and modifying, wherein the stirring speed is 150 revolutions per minute.
(3) And (3) preparing a finished product: and (3) drying the target product obtained in the step (2) to obtain solid particles, namely the modified adsorbent.
The prepared modified adsorbent is used for treating secondary effluent with COD of 67mg/L, and the removal rate of COD is 55.22% after adsorption for 10min when the addition amount is 20 mg/L.
Example 2: the preparation method of the modified adsorbent comprises the following steps:
(1) preparation of a medicament: the poly dimethyl diallyl ammonium chloride is weighed and dissolved in ultrapure water to prepare a 1% poly dimethyl diallyl ammonium chloride solution. According to the mass ratio of the poly (diallyl dimethyl ammonium chloride) to the poly (dimethyl ammonium chloride) of 20: weighing diatomite and dissolving the diatomite in a poly dimethyl diallyl ammonium chloride solution.
(2) The modification process comprises the following steps: and (2) stirring the diatomite and the poly dimethyl diallyl ammonium chloride solution in the step (1) at 40 ℃ for 3 hours, fully mixing and modifying, wherein the stirring speed is 150 revolutions per minute.
(3) And (3) preparing a finished product: and (3) drying the target product obtained in the step (2) to obtain solid particles, namely the modified adsorbent.
The prepared modified adsorbent treats secondary effluent with COD of 67mg/L, and the removal rate of COD is 77.61% after 10min of adsorption when the addition amount is 20 mg/L.
Example 3: the preparation method of the modified adsorbent comprises the following steps:
(1) preparation of a medicament: the poly dimethyl diallyl ammonium chloride is weighed and dissolved in ultrapure water to prepare a 1% poly dimethyl diallyl ammonium chloride solution. According to the mass ratio of 25: weighing diatomite and dissolving the diatomite in a poly dimethyl diallyl ammonium chloride solution.
(2) The modification process comprises the following steps: and (2) stirring the diatomite and the poly dimethyl diallyl ammonium chloride solution in the step (1) at 40 ℃ for 3 hours, fully mixing and modifying, wherein the stirring speed is 150 revolutions per minute.
(3) And (3) preparing a finished product: and (3) drying the target product obtained in the step (2) to obtain solid particles, namely the modified adsorbent.
The prepared modified adsorbent treats secondary effluent with COD of 67mg/L, and the removal rate of COD is 61.19% after 10min of adsorption when the addition amount is 20 mg/L.
The inorganic-organic polymer composite coagulant can be prepared by adjusting the process parameters according to the content of the invention, tests show that the inorganic-organic polymer composite coagulant has basically consistent performance with the invention, the COD removal effect can be effectively enhanced after the modified adsorbent is added into the secondary effluent, and the residual adsorbent in the sewage can be rapidly settled under the action of gravity after the modified adsorbent is added, so that the subsequent process is not influenced. . The invention has been described in an illustrative manner, and it is to be understood that any simple variations, modifications or other equivalent changes which can be made by one skilled in the art without departing from the spirit of the invention fall within the scope of the invention.
Claims (10)
1. A modified adsorbent for removing COD in secondary effluent is characterized by comprising the following steps: uniformly dispersing diatomite and poly dimethyl diallyl ammonium chloride in a water phase for modification, and drying after modification to obtain solid particles, namely the modified adsorbent; wherein the mass ratio of the diatomite to the poly dimethyl diallyl ammonium chloride is (10-25): 1, the temperature of the modification reaction is 20-50 ℃, the time of the modification reaction is 1-5 hours, and the number average molecular weight of the poly dimethyl diallyl ammonium chloride is 10000-100000.
2. The modified adsorbent for removing COD from secondary effluent of claim 1 wherein the polydimethyldiallylammonium chloride has a number average molecular weight of 40000-80000.
3. The modified adsorbent for removing COD in secondary effluent of claim 1, wherein the mass ratio of diatomite to poly dimethyl diallyl ammonium chloride is (15-25): 1.
4. the modified adsorbent for removing COD in secondary effluent according to claim 1, wherein the temperature of the modification reaction is 25-40 ℃ and the time of the modification reaction is 3-5 hours; mechanical stirring is adopted to realize uniform dispersion, and the stirring speed is 100-300 revolutions per minute.
5. The modified adsorbent for removing COD in secondary effluent of claim 1, wherein the water phase is ultrapure water and the mass percent of poly (dimethyl diallyl ammonium chloride) in the water phase is 0.5-1.5%.
6. A preparation method of a modified adsorbent for removing COD in secondary effluent is characterized by comprising the following steps: uniformly dispersing diatomite and poly dimethyl diallyl ammonium chloride in a water phase for modification, and drying after modification to obtain solid particles, namely the modified adsorbent; wherein the mass ratio of the diatomite to the poly dimethyl diallyl ammonium chloride is (10-25): 1, the temperature of the modification reaction is 20-50 ℃, the time of the modification reaction is 1-5 hours, and the number average molecular weight of the poly dimethyl diallyl ammonium chloride is 10000-100000.
7. The method for preparing the modified adsorbent for removing COD in the secondary effluent according to claim 6, wherein the number average molecular weight of the poly dimethyl diallyl ammonium chloride is 40000-80000.
8. The method for preparing the modified adsorbent for removing COD in the secondary effluent according to claim 6, wherein the mass ratio of the diatomite to the poly dimethyl diallyl ammonium chloride is (15-25): 1.
9. the method for preparing the modified adsorbent for removing COD in the secondary effluent according to claim 6, wherein the temperature of the modification reaction is 25-40 ℃ and the time of the modification reaction is 3-5 hours; mechanical stirring is adopted to realize uniform dispersion, and the stirring speed is 100-300 revolutions per minute.
10. The method for preparing the modified adsorbent for removing COD in the secondary effluent according to claim 6, wherein the water phase is ultrapure water, and the mass percentage of the poly dimethyl diallyl ammonium chloride in the water phase is 0.5-1.5%.
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| CN202011111736.8A CN114377649A (en) | 2020-10-16 | 2020-10-16 | Modified adsorbent for removing COD in secondary effluent and preparation method thereof |
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| CN202011111736.8A CN114377649A (en) | 2020-10-16 | 2020-10-16 | Modified adsorbent for removing COD in secondary effluent and preparation method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11114313A (en) * | 1997-10-09 | 1999-04-27 | Sony Corp | Flocculant and flocculating method using that |
| JP2012143739A (en) * | 2010-04-20 | 2012-08-02 | Nankai Kako Kk | Treating apparatus and treating method of liquid containing cod, toc and dyestuff component |
| CN105727903A (en) * | 2016-02-17 | 2016-07-06 | 济南大学 | Preparation method of dimethyl diallyl ammonium chloride-modified porous diatomaceous earth |
| CN106396061A (en) * | 2016-11-25 | 2017-02-15 | 南宁市黑晶信息技术有限公司 | Sewage treating agent for treating industrial sewage and preparation method thereof |
| CN106587213A (en) * | 2016-12-30 | 2017-04-26 | 余姚市哈特馒餐饮有限公司 | Sewage treatment agent for treating fermentation wastewater and preparation method thereof |
-
2020
- 2020-10-16 CN CN202011111736.8A patent/CN114377649A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11114313A (en) * | 1997-10-09 | 1999-04-27 | Sony Corp | Flocculant and flocculating method using that |
| JP2012143739A (en) * | 2010-04-20 | 2012-08-02 | Nankai Kako Kk | Treating apparatus and treating method of liquid containing cod, toc and dyestuff component |
| CN105727903A (en) * | 2016-02-17 | 2016-07-06 | 济南大学 | Preparation method of dimethyl diallyl ammonium chloride-modified porous diatomaceous earth |
| CN106396061A (en) * | 2016-11-25 | 2017-02-15 | 南宁市黑晶信息技术有限公司 | Sewage treating agent for treating industrial sewage and preparation method thereof |
| CN106587213A (en) * | 2016-12-30 | 2017-04-26 | 余姚市哈特馒餐饮有限公司 | Sewage treatment agent for treating fermentation wastewater and preparation method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 张尊举等: ""改性硅藻土对城市污水的深度处理"", 《工业安全与环保》, vol. 39, no. 8, pages 8 - 10 * |
| 曹亚丽: ""硅藻土的有机改性及其对腐植酸的吸附"", 《青岛科技大学学报》, vol. 27, no. 6, pages 486 - 489 * |
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