CN1087004C - New technology for treating waste water by lime causticization - Google Patents
New technology for treating waste water by lime causticization Download PDFInfo
- Publication number
- CN1087004C CN1087004C CN96123502A CN96123502A CN1087004C CN 1087004 C CN1087004 C CN 1087004C CN 96123502 A CN96123502 A CN 96123502A CN 96123502 A CN96123502 A CN 96123502A CN 1087004 C CN1087004 C CN 1087004C
- Authority
- CN
- China
- Prior art keywords
- waste water
- lime
- new technology
- treating
- causticization
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000002351 wastewater Substances 0.000 claims abstract description 36
- 238000000034 method Methods 0.000 claims abstract description 27
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 23
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 23
- 239000004571 lime Substances 0.000 claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000006243 chemical reaction Methods 0.000 claims abstract description 11
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 10
- 239000002244 precipitate Substances 0.000 claims abstract description 7
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 6
- 239000010815 organic waste Substances 0.000 claims abstract description 4
- 238000007599 discharging Methods 0.000 claims description 6
- 238000001556 precipitation Methods 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 4
- 238000009993 causticizing Methods 0.000 claims description 3
- 230000001376 precipitating effect Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 239000000126 substance Substances 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 3
- 239000000084 colloidal system Substances 0.000 abstract description 3
- 235000013365 dairy product Nutrition 0.000 abstract description 3
- 230000005484 gravity Effects 0.000 abstract description 3
- 239000010985 leather Substances 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 abstract description 2
- 235000010216 calcium carbonate Nutrition 0.000 abstract 1
- 239000002002 slurry Substances 0.000 abstract 1
- 239000007787 solid Substances 0.000 abstract 1
- 239000000725 suspension Substances 0.000 abstract 1
- 230000003647 oxidation Effects 0.000 description 6
- 238000007254 oxidation reaction Methods 0.000 description 6
- 238000005273 aeration Methods 0.000 description 4
- 238000004537 pulping Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 229920005610 lignin Polymers 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 244000025254 Cannabis sativa Species 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 238000005191 phase separation Methods 0.000 description 1
- 239000012716 precipitator Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/40—Production or processing of lime, e.g. limestone regeneration of lime in pulp and sugar mills
Landscapes
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The present invention discloses a new technology for treating waste water by lime causticization, which is suitable for treating suspension and colloid waste water. In the new technology for treating waste water by lime causticization, a certain amount of lime is added into the waste water, CO2 gas is led into the waste water, and the suspended state and the specific gravity of the hydrophilic groups of organic substances in the waste water are damaged by a physical reaction and a chemical reaction. Therefore, a CaCO3 precipitate and other precipitates can be generated, and solid and liquid substances can be separated within half an hour. The clearance rate of the new technology for treating waste water by lime causticization reaches about 95%, and the new technology for treating waste water by lime causticization is particularly suitable for polluted waste water discharged by the chemically slurry manufacturing process of medium and small-sized enterprise paper mills by a lime method and is also suitable for organic waste water discharged by the manufacture of dairy products, food and leather. The present invention has the advantages of little investment, simple appliance and low operating cost.
Description
The invention relates to an environmental protection method, in particular to an industrial wastewater treatment process. It is a method for treating organic waste water by causticizing and neutralizing reaction with lime, and is especially suitable for treating waste water in lime pulping paper mill.
At present, many small and medium-sized paper mills are available at home and abroad, most of the small and medium-sized paper mills adopt lime process for pulping and making paper, the generated waste water seriously pollutes the surrounding environment, and the production, life and body health of people are greatly threatened, so that the country treats the sewage generated by some small and medium-sized paper mills with serious pollution for a long time. In view of the situation, many small and medium-sized plants are required to treat wastewater, and they are required to treat organic wastewater by using various processes such as flocculation method using inorganic and organic flocculants, air floatation method, precipitation method, aeration oxidation method and biological oxidation method. These methods generally have long operation period, high cost, large occupied land area, large capital investment, poor economic benefit and unsatisfactory effect, so that the methods are difficult to adopt in medium and small sized paper mills. The wastewater still seriously pollutes water areas such as rivers, lakes and seas and pollutes air, so that the health of people is seriously harmed all the time, therefore, the country is forced to stop part of factories which seriously pollute the environment, thereby causing great economic loss, and leading the factories to be irresistible to be opened.
The invention aims to overcome the defects of the prior art and provide a method for treating the waste water of the lime causticization method for treating the waste water of the lime pulping paper mill, wherein the organic matters of the waste water treated by the method can be reduced by about 95 percent, and the full closed-loop circulation of production is realized, and the further aeration can reach the discharge standard regulated by the state.
The task of the invention is implemented in the following way: a process for causticizing waste water with lime includes adding lime to organic waste water and introducing CO2A gas; the method for treating the wastewater is carried out at normal temperature and normal pressure and comprises the following steps:
1) discharging the waste water into a reservoir, and adding emulsified supersaturated Ca (OH)2Stirring the solution to make it reach saturation or supersaturation;
2) after stirring evenly, introducing CO2Gas, reacting with Ca (OH) in water2Reaction to produce CaCO3↓, depositing for half an hour, and the clearance rate reaches 95%;
3) recovering the clear water after precipitation, and discharging after the clear water is oxidized to reach the standard;
4) the precipitate is filtered and calcined to obtain high-quality lime which can be reused.
Compared with the prior art, the invention has the advantages that:
1. the invention uses high-efficiency and low-price precipitator through physical and chemical reactions, thereby achieving the purposes of precipitating impurities in the wastewater and solid-liquid separation.
2. The equipment is simple, the investment is low, the treatment capacity is large, the operation cost is low, and the use effect is good; the wastewater is removed by about 95 percent, so that zero discharge or most of wastewater reaching the standard can be realized in a factory.
3. The clear water after precipitation can be returned to the factory for production, and can also be pumped into an aeration oxidation pond, and is discharged after the oxidation reaches the standard.
4. The precipitate is filtered and calcined to obtain high-quality lime which can be reused.
5. The method also has good treatment effect on other organic wastewater, such as organic wastewater discharged by food, dairy products, leather products and the like.
The present invention will be described in further detail by way of examples below:
the principle of the invention is as follows: the waste water of paper mill produced by lime method contains lignin, fiber and fine suspended particles, and the organic matter will deteriorate, decay and smell for a long time, and produce harmful substance to pollute environment. The organic substances in the waste water are Ca and partial hydroxyl groups of lignin, fiber and other organic substances separated from paper raw materials (such as wood or grass) by lime causticization in the pulping process++The reaction produces hydrophilic colloid which forms hydrophilic group and has small specific gravity, so that it is not easy to precipitate, and especially some fine fiber is easy to suspend in water, so that when the waste water is treated, lime (or flocculant) is added to increase Ca content in the waste water++Concentration and hydrophilic groups, and then filling a large amount of CO2After the gas is generated, the chemical reaction is generated, and Ca in the hydrophilic groups of the organic matters++With Ca in the wastewater++Generates CaCO3↓towater insoluble carbonate, which can be largely precipitated and attached to organic matter to increase its specific gravity and destroy hydrophilic colloid state to form a common precipitatePrecipitating to achieve the purpose of solid-liquid phase separation. Because of CaCO3The particles of ↓ are small, the total surface area is large, and the micro organic and inorganic matters in the water can be adsorbed in a large amount to precipitate, so that the water becomes clear, and the purpose of wastewater treatment is achieved. The wastewater treated by the method is reacted at normal temperature and normal pressure, and the main reaction equation is as follows:
the implementation process comprises the following steps:
1. discharging the waste water into a reservoir, and adding emulsified supersaturated Ca (OH)2The solution is stirred to reach saturation or supersaturation.
2. After being stirred evenly, CO can be introduced2Gas, reacting with Ca (OH) in water2Reaction to produce CaCO3And ↓, after the reaction is finished, the natural sedimentation can be finished after about half an hour, and the clearance rate reaches about 95 percent.
3. The clear water after precipitation can be recovered and then used for production; or pumping into an aeration oxidation tank, and discharging after the oxidation reaches the standard.
4. The precipitate is filtered and calcined to obtain high-quality lime which can be reused.
Claims (1)
1. A process for causticizing waste water with lime includes adding lime to organic waste water and introducing CO2A gas; the method is characterizedin that: the method for treating the wastewater is carried out at normal temperature and normal pressure and comprises the following steps:
1) discharging the waste water into a reservoir, and adding emulsified supersaturated Ca (OH)2Stirring the solution to make it reach saturation or supersaturation;
2) after stirring evenly, introducing CO2Gas, reacting with Ca (OH) in water2Reaction to produce CaCO3↓，Precipitating for half an hour, and removing the precipitate with a clearance rate of 95%;
3) recovering the clear water after precipitation, and discharging after the clear water is oxidized to reach the standard;
4) the precipitate is filtered and calcined to obtain high-quality lime which can be reused.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96123502A CN1087004C (en) | 1996-12-31 | 1996-12-31 | New technology for treating waste water by lime causticization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96123502A CN1087004C (en) | 1996-12-31 | 1996-12-31 | New technology for treating waste water by lime causticization |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1186779A CN1186779A (en) | 1998-07-08 |
| CN1087004C true CN1087004C (en) | 2002-07-03 |
Family
ID=5127664
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96123502A Expired - Fee Related CN1087004C (en) | 1996-12-31 | 1996-12-31 | New technology for treating waste water by lime causticization |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1087004C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2350782B1 (en) * | 2009-06-17 | 2011-11-18 | Fundación Investigación E Innovación Para El Desarrollo Social | PROCESS FOR THE ELIMINATION OF CONTAMINATION OF BIORESIDUES AND ENERGY PRODUCTION WITH THE SUB-PRODUCTS OBTAINED. |
-
1996
- 1996-12-31 CN CN96123502A patent/CN1087004C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1186779A (en) | 1998-07-08 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |