CN1133597C - Method for removing micropollutant nitrate and nitrite from drinking water - Google Patents
Method for removing micropollutant nitrate and nitrite from drinking water Download PDFInfo
- Publication number
- CN1133597C CN1133597C CNB991007395A CN99100739A CN1133597C CN 1133597 C CN1133597 C CN 1133597C CN B991007395 A CNB991007395 A CN B991007395A CN 99100739 A CN99100739 A CN 99100739A CN 1133597 C CN1133597 C CN 1133597C
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- nitrite
- nitrate
- drinking water
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- water
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- Y02W10/12—
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- Treatment Of Water By Oxidation Or Reduction (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The present invention relates to a method for removing micropollutant nitrate and nitrite from drinking water. The method removes nitrogen, nitrate and nitrite, combines filtration processing and sterilization processing, and favorably solves the contamination problem of the nitrate in the drinking water by making use of a biological process. According to practical application, the method proves to have obvious and stable dirt-removing effects, convenient maintenance operation and low operation cost. The water return rate is 100%, and water resources are saved, and the drinking water which is processed by the method can completely reach to the national standard of drinking water.
Description
The invention relates to water purification technology.
At present, the contents of nitrate and nitrite in most urban drinking water in China seriously exceed the standard. In the conventional desalting process, an ion exchange method, a membrane method and the like are generally adopted. These methods, while capable of handling, have many disadvantages: high treatment cost, low water recovery rate of only 30-60%, and pretreatment and post-treatment. Therefore, it is difficult to popularize and use the method on a large scale in practice.
Biological denitrification denitrogenation is a treatment technology newly developed in recent years, and compared with a chemical physical method, the biological denitrification denitrogenation has the advantages of low operation cost, high denitrogenation efficiency and the like, so that the biological denitrification denitrogenation attracts attention and research of many people. The biological denitrification denitrogenation is to utilize denitrifying bacteria to remove NO in water3 -The following reactions occur:
although the method has good treatment effect and low cost, the method also has the following problems:
1) after treatment, the bacteria flow out with the water. 2) Produce a new pollutant nitrite which is reduced to N because the nitrate is difficult to remove by 100 percent due to the limitation of the treatment scale2The presence of nitrite as an intermediate in water is inevitable. 3) Carbon source is needed to be provided in the biological reaction, and new secondary pollution is introduced by adding the carbon source in the drinking water. These problems have severely affected the use of biological processes in drinking water.
The invention aims to provide a method for eliminating micro-pollutants of nitrate and nitrite in drinking water. The method can better solve the pollution problem of nitrate in drinking water.
The invention is realized by the following steps:
the method comprises the following process flows:
water intake → removal of nitrate by biological method → removal of nitrite → filtration and disinfection
1) Firstly, autotrophic denitrifying bacteria (such as thiobacillus, etc.) are adopted in the filter, and inorganic matrix and sulfur are utilizedAs a filter material, a hydrogen donor and an inorganic carbon source are provided. Use of NO by denitrifying bacteria under anaerobic conditions3 -As hydrogen acceptor, to make NO3 -Conversion to N2×) as follows:
as can be seen from the above two equations, S is used as the matrix and SO is contained in water4 2-Can increase and affect water quality, so that the culture of anti-sulfuration bacteria in biological reaction can make anaerobic process occur And (4) reacting. Therefore, organic carbon sources are not added into the water, other salt-containing components are not increased, and only harmful nitrate in the water is removed.
The above process is realized by a biological filter. The biological filter is measured by biological load F: 180g/m3Day<F<700g/m3The biological filtration rate is determined according to the biological load requirement.
2) Removing nitrite, and adding oxidant into the treated water, wherein the reaction process is as follows:
3) filtering and disinfecting: selecting O3、Cl2、ClO2And (5) performing disinfection and filtration treatment.
Compared with the related technology, the invention has the following characteristics: the effect of removing nitrate and nitrite is obvious, and the method is safe, reliable and stable, and the maintenance and operation are very convenient in the operation process. Other substances are not added in the operation, external power is not needed, and the operation cost is low. The water return rate is high, can reach 100 percent of recovery, and saves water resources. The invention is suitable for cities, villages, districts, surface water and undergroundAnd (4) removing water nitrate pollution. After the biological agent is put into use in Beijing Yihai residential districts, the effect is good. Raw water NO3 -The N is reduced to about 8mg/l after being treated from 60mg/l, and other indexes such as nitrite and bacteria reach the national drinking water standard.
Claims (2)
1. A method for eliminating micro-pollutants of nitrate and nitrite in drinking water is characterized in that: the process flow is as follows:
water intake → removal of nitrate by biological method → removal of nitrite → filtration sterilization, namely:
1) firstly, autotrophic denitrifying bacteria are adopted in a filter tank, inorganic substrate sulfur is used as a filter material, hydrogen donor and inorganic carbon source are provided, and NO is utilized by the denitrifying bacteria under anaerobic condition3 -As hydrogen acceptor, to make NO3 -Conversion to N2×) as follows:
the process is realized by a biological filter, and the biological filter is measured by a biological load F: 180g/m3Day<F<700g/m3Day, the biological filtration rate is set according to the biological load requirement;
2) adding an oxidant into the treated water to remove nitrite, wherein the reaction process is as follows:
3) selecting O3、Cl2、ClO2And (5) performing disinfection and filtration treatment.
2. The method for eliminating micro-pollutants of nitrate and nitrite in drinking water as claimed in claim 1, wherein: the autotrophic denitrifying bacteria belong to the genus Thiobacillus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB991007395A CN1133597C (en) | 1999-02-12 | 1999-02-12 | Method for removing micropollutant nitrate and nitrite from drinking water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB991007395A CN1133597C (en) | 1999-02-12 | 1999-02-12 | Method for removing micropollutant nitrate and nitrite from drinking water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1263055A CN1263055A (en) | 2000-08-16 |
| CN1133597C true CN1133597C (en) | 2004-01-07 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB991007395A Expired - Lifetime CN1133597C (en) | 1999-02-12 | 1999-02-12 | Method for removing micropollutant nitrate and nitrite from drinking water |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1133597C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5149717B2 (en) * | 2008-07-03 | 2013-02-20 | オルガノ株式会社 | Denitrification treatment method and denitrification treatment apparatus |
| CN104860488B (en) * | 2015-06-09 | 2016-09-28 | 桂林理工大学 | Rural households utilize the method that rice wine oneself removes nitrate in groundwater |
| CN108706727B (en) * | 2018-04-19 | 2021-07-27 | 中国矿业大学 | Baffling type anaerobic autotrophic denitrification biological reaction process and device |
-
1999
- 1999-02-12 CN CNB991007395A patent/CN1133597C/en not_active Expired - Lifetime
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| Publication number | Publication date |
|---|---|
| CN1263055A (en) | 2000-08-16 |
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| C14 | Grant of patent or utility model | ||
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Owner name: XIAO DONG Free format text: FORMER OWNER: BEIJING JINGRUN NEW TECHNOLOGY DEVELOPMENT CO., LTD. Effective date: 20031205 |
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| C41 | Transfer of patent application or patent right or utility model | ||
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Effective date of registration: 20031205 Address after: 100028 Beijing City, Chaoyang District Henan Xiba Building No. 12 room 1004 Patentee after: Xiao Dong Address before: 100012 Beijing Andingmen Dayangfang No. 6 Patentee before: Beijing Jingrun New Technology Development Co., Ltd. |
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Owner name: BEIJING JINGRUN NEW TECHNOLOGY DEVELOPMENT CO., LT Free format text: FORMER OWNER: XIAO DONG Effective date: 20110713 |
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Free format text: CORRECT: ADDRESS; FROM: 100028 ROOM 1004, BUILDING 12, XIBAHE NANLI, CHAOYANG DISTRICT, BEIJING TO: 100085 D812, JIAHUA BUILDING, NO. 3, SHANGDI EAST ROAD, HAIDIAN DISTRICT, BEIJING |
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Effective date of registration: 20110713 Address after: 100085, Ka Wah building, 3 East Road, Beijing, Haidian District, D812 Patentee after: Beijing Jingrun New Technology Development Co., Ltd. Address before: 100028 Beijing City, Chaoyang District Henan Xiba Building No. 12 room 1004 Patentee before: Xiao Dong |
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