CN112607892A - Efficient and environment-friendly method for reducing COD (chemical oxygen demand) of sewage - Google Patents
Efficient and environment-friendly method for reducing COD (chemical oxygen demand) of sewage Download PDFInfo
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- CN112607892A CN112607892A CN202011240725.XA CN202011240725A CN112607892A CN 112607892 A CN112607892 A CN 112607892A CN 202011240725 A CN202011240725 A CN 202011240725A CN 112607892 A CN112607892 A CN 112607892A
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- 239000010865 sewage Substances 0.000 title claims abstract description 103
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000000126 substance Substances 0.000 title claims description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims description 6
- 239000001301 oxygen Substances 0.000 title claims description 6
- 229910052760 oxygen Inorganic materials 0.000 title claims description 6
- 238000003756 stirring Methods 0.000 claims abstract description 27
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000003124 biologic agent Substances 0.000 claims abstract description 22
- 239000007800 oxidant agent Substances 0.000 claims abstract description 22
- 230000001590 oxidative effect Effects 0.000 claims abstract description 22
- 239000008394 flocculating agent Substances 0.000 claims abstract description 19
- 238000006243 chemical reaction Methods 0.000 claims abstract description 17
- 238000001179 sorption measurement Methods 0.000 claims abstract description 13
- 238000005189 flocculation Methods 0.000 claims abstract description 10
- 230000016615 flocculation Effects 0.000 claims abstract description 10
- 238000001556 precipitation Methods 0.000 claims abstract description 10
- 239000004115 Sodium Silicate Substances 0.000 claims abstract description 8
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 8
- 238000003825 pressing Methods 0.000 claims abstract description 8
- 239000010802 sludge Substances 0.000 claims abstract description 8
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 8
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims abstract description 7
- 229910001634 calcium fluoride Inorganic materials 0.000 claims abstract description 7
- 238000007599 discharging Methods 0.000 claims abstract description 7
- 238000001914 filtration Methods 0.000 claims abstract description 7
- 230000003647 oxidation Effects 0.000 claims abstract description 7
- 230000001376 precipitating effect Effects 0.000 claims abstract description 7
- 238000000926 separation method Methods 0.000 claims abstract description 7
- 239000006228 supernatant Substances 0.000 claims abstract description 7
- 239000002562 thickening agent Substances 0.000 claims abstract description 7
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical group OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 12
- 230000007613 environmental effect Effects 0.000 claims description 6
- 229920002401 polyacrylamide Polymers 0.000 claims description 6
- 229910007161 Si(CH3)3 Inorganic materials 0.000 claims description 3
- 230000035484 reaction time Effects 0.000 claims description 2
- 239000012535 impurity Substances 0.000 abstract description 3
- 229910052799 carbon Inorganic materials 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 239000002253 acid Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
-
- 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
-
- 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
- C02F2001/007—Processes including a sedimentation step
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Water Treatment By Sorption (AREA)
Abstract
The invention discloses a method for efficiently and environmentally reducing COD in sewage, which comprises the following steps: firstly, adding a biological agent and an oxidant into sewage, and carrying out oxidation treatment on the sewage; filtering and precipitating the sewage, and then adding active carbon into the sewage for adsorption; then adding sodium silicate solution into the sewage until the pH value is 8.0-9.0, and stirring for reaction; then adding calcium fluoride solution into the sewage until the pH value is 6.5-7.0, and stirring for reaction; and finally, adding a flocculating agent into the sewage, stirring, performing flocculation precipitation on the obtained solution, discharging supernatant by using a thickener, and performing plate-and-frame filter pressing separation on the precipitated sludge to obtain the sludge. The method of the invention mixes the biological agent and the oxidant into the sewage, and removes the impurity in the sewage through chemical reaction and flocculation precipitation. By the method, COD in the sewage can be reduced to below 20mg/L, and the sewage is ensured to be discharged after reaching the standard.
Description
Technical Field
The invention belongs to the technical field of water treatment, and particularly relates to a high-efficiency environment-friendly method for reducing COD (chemical oxygen demand) in sewage.
Background
At present, the annual total water consumption of China breaks through 6000 billions of cubic meters, and the per-capita water resource quantity is only 2100 cubic meters and is only 28 percent of the per-capita level in the world. The average water shortage in the country is 500 billion cubic meters, two thirds of cities have water shortage, 9 provinces and cities in the north occupy less than 500 cubic meters of water, far less than the internationally specified minimum standard (1000 cubic meters), and the water shortage is listed as one of world water-deficient countries. With the rapid development of social economy, the sewage amount in China currently reaches 820 hundred million tons, the annual increase is 20 hundred million tons, and the daily sewage discharge amount reaches 2 hundred million tons. In the smelting flue gas and roasting process, diluted acid is generated by spraying, but after waste acid is neutralized by lime, COD in the wastewater is seriously exceeded after plate-frame filter pressing, and the COD in the wastewater discharge index of the yellow river basin section is required to be less than or equal to 50 mg/L. Therefore, a method for reducing COD in sewage with high efficiency and environmental protection needs to be found.
Disclosure of Invention
The invention aims to provide a method for efficiently and environmentally reducing sewage COD, which improves the removal rate of the sewage COD.
The technical scheme adopted by the invention is that the method for efficiently and environmentally reducing the COD of the sewage is implemented according to the following steps:
step 1, adding a biological agent and an oxidant into sewage, and carrying out oxidation treatment on the sewage;
step 2, filtering and precipitating the sewage obtained in the step 1, and then adding activated carbon into the sewage for adsorption;
step 3, adding a sodium silicate solution with the mass concentration of 1-3% into the sewage obtained in the step 2 until the pH value is 8.0-9.0, and carrying out stirring reaction;
step 4, adding a calcium fluoride solution with the mass concentration of 1-3% into the sewage obtained in the step 3 until the pH value is 6.5-7.0, and stirring for reaction;
and 5, adding a flocculating agent into the sewage obtained in the step 4, stirring, performing flocculation precipitation on the obtained solution, discharging supernatant by using a thickener, and performing plate-and-frame filter pressing separation on precipitated sludge to reduce COD (chemical oxygen demand) of the sewage.
The present invention is also characterized in that,
in step 1, the biological agent is K4[Fe(CN)6]、K3[Fe(CN)6]、Fe[N(Si(CH3)3)2]3Any one of them.
In the step 1, the oxidant is hydrogen peroxide with the mass concentration of 30-35%; the mass ratio of the sewage, the biological agent and the oxidant is 500-800: 1: 2-4.
In the step 2, the mass ratio of the activated carbon to the sewage is 1: 600-700; the adsorption time is 10-28 h.
In the step 3, the step 4 and the step 5, the stirring reaction time is 10-15 minutes.
In the step 5, the mass ratio of the flocculating agent to the sewage is 1: 200-500; the flocculating agent is polyacrylamide.
The invention has the beneficial effects that:
the method of the invention mixes the biological agent and the oxidant into the sewage, and removes the impurity in the sewage through chemical reaction and flocculation precipitation. By the method, COD in the sewage can be reduced to below 20mg/L, and the sewage is ensured to be discharged after reaching the standard. In addition, the treatment method has mild operation conditions, does not relate to high temperature and high pressure, and is suitable for large-scale production.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
The invention relates to a method for efficiently and environmentally reducing COD in sewage, which is implemented according to the following steps:
step 1, adding a biological agent and an oxidant into sewage, and carrying out oxidation treatment on the sewage;
the biological agent is K4[Fe(CN)6]、K3[Fe(CN)6]、Fe[N(Si(CH3)3)2]3Any one of the above;
the oxidant is hydrogen peroxide with the mass concentration of 30-35%;
the mass ratio of the sewage, the biological agent and the oxidant is 500-800: 1: 2-4;
step 2, filtering and precipitating the sewage obtained in the step 1, and then adding activated carbon into the sewage for adsorption;
the mass ratio of the activated carbon to the sewage is 1: 600-700; the adsorption time is 10-28 h;
step 3, adding a sodium silicate solution with the mass concentration of 1-3% into the sewage obtained in the step 2 until the pH value is 8.0-9.0, and carrying out stirring reaction for 10-15 minutes;
step 4, adding a calcium fluoride solution with the mass concentration of 1-3% into the sewage obtained in the step 3 until the pH value is 6.5-7.0, and carrying out stirring reaction for 10-15 minutes;
step 5, adding a flocculating agent into the sewage obtained in the step 4, stirring, performing flocculation precipitation on the obtained solution, discharging supernatant by using a thickener, and performing plate-and-frame filter pressing separation on precipitated sludge;
the mass ratio of the flocculating agent to the sewage is 1: 200-500;
the flocculating agent is polyacrylamide; the stirring time is 10-15 minutes.
The principle of the method of the invention is as follows: mixing and adding the sewage through a biological agent and an oxidant, carrying out chemical oxidation reaction, then adjusting the pH value by utilizing the properties of sodium silicate and calcium chloride, carrying out chemical reaction and flocculation precipitation to remove impurities in the sewage, and reducing COD (chemical oxygen demand) in the sewage to be below 20mg/L, thereby ensuring that the sewage is discharged after reaching the standard.
Example 1
The invention relates to a method for efficiently and environmentally reducing COD in sewage, which is implemented according to the following steps:
step 1, adding a biological agent and an oxidant into sewage, and carrying out oxidation treatment on the sewage;
the biological agent is K4[Fe(CN)6]；
The oxidant is hydrogen peroxide with the mass concentration of 30 percent;
the mass ratio of the sewage, the biological agent and the oxidant is 500: 1: 4;
step 2, filtering and precipitating the sewage obtained in the step 1, and then adding activated carbon into the sewage for adsorption;
the mass ratio of the activated carbon to the sewage is 1: 600, preparing a mixture; the adsorption time is 10 h;
step 3, adding a sodium silicate solution with the mass concentration of 1% into the sewage obtained in the step 2 until the pH value is 8.0, and carrying out stirring reaction for 10 minutes;
step 4, adding a calcium fluoride solution with the mass concentration of 1% into the sewage obtained in the step 3 until the pH value is 6.5, and carrying out stirring reaction for 10 minutes;
step 5, adding a flocculating agent into the sewage obtained in the step 4, stirring, performing flocculation precipitation on the obtained solution, discharging supernatant by using a thickener, and performing plate-and-frame filter pressing separation on precipitated sludge;
the mass ratio of the flocculating agent to the sewage is 1: 200 of a carrier;
the flocculating agent is polyacrylamide; the stirring time was 10 minutes.
Example 2
The invention relates to a method for efficiently and environmentally reducing COD in sewage, which is implemented according to the following steps:
step 1, adding a biological agent and an oxidant into sewage, and carrying out oxidation treatment on the sewage;
the biological agent is K3[Fe(CN)6]；
The oxidant is 35% hydrogen peroxide by mass concentration;
the mass ratio of the sewage, the biological agent and the oxidant is 600: 1: 2;
step 2, filtering and precipitating the sewage obtained in the step 1, and then adding activated carbon into the sewage for adsorption;
the mass ratio of the activated carbon to the sewage is 1: 650; the adsorption time is 15 h;
step 3, adding a sodium silicate solution with the mass concentration of 3% into the sewage obtained in the step 2 until the pH value is 9.0, and carrying out stirring reaction for 15 minutes;
step 4, adding a calcium fluoride solution with the mass concentration of 3% into the sewage obtained in the step 3 until the pH value is 7.0, and carrying out stirring reaction for 15 minutes;
step 5, adding a flocculating agent into the sewage obtained in the step 4, stirring, performing flocculation precipitation on the obtained solution, discharging supernatant by using a thickener, and performing plate-and-frame filter pressing separation on precipitated sludge;
the mass ratio of the flocculating agent to the sewage is 1: 500, a step of;
the flocculating agent is polyacrylamide; the stirring time was 15 minutes.
After the steps, the COD in the sewage can be reduced to 14 mg/L.
Example 3
The invention relates to a method for efficiently and environmentally reducing COD in sewage, which is implemented according to the following steps:
step 1, adding a biological agent and an oxidant into sewage, and carrying out oxidation treatment on the sewage;
the biological agent is Fe [ N (Si (CH)3)3)2]3Any one of the above;
the oxidant is hydrogen peroxide with the mass concentration of 30 percent;
the mass ratio of the sewage, the biological agent and the oxidant is 600: 1: 4;
step 2, filtering and precipitating the sewage obtained in the step 1, and then adding activated carbon into the sewage for adsorption;
the mass ratio of the activated carbon to the sewage is 1: 700 of the base material; the adsorption time is 20 h;
step 3, adding a sodium silicate solution with the mass concentration of 3% into the sewage obtained in the step 2 until the pH value is 8.5, and carrying out stirring reaction for 15 minutes;
step 4, adding a calcium fluoride solution with the mass concentration of 2% into the sewage obtained in the step 3 until the pH value is 7.0, and carrying out stirring reaction for 15 minutes;
step 5, adding a flocculating agent into the sewage obtained in the step 4, stirring, performing flocculation precipitation on the obtained solution, discharging supernatant by using a thickener, and performing plate-and-frame filter pressing separation on precipitated sludge;
the mass ratio of the flocculating agent to the sewage is 1: 500, a step of;
the flocculating agent is polyacrylamide; the stirring time was 10 minutes.
After the steps, the COD in the sewage can be reduced to 15 mg/L.
Claims (6)
1. A method for efficiently and environmentally reducing COD in sewage is characterized by comprising the following steps:
step 1, adding a biological agent and an oxidant into sewage, and carrying out oxidation treatment on the sewage;
step 2, filtering and precipitating the sewage obtained in the step 1, and then adding activated carbon into the sewage for adsorption;
step 3, adding a sodium silicate solution with the mass concentration of 1-3% into the sewage obtained in the step 2 until the pH value is 8.0-9.0, and carrying out stirring reaction;
step 4, adding a calcium fluoride solution with the mass concentration of 1-3% into the sewage obtained in the step 3 until the pH value is 6.5-7.0, and stirring for reaction;
and 5, adding a flocculating agent into the sewage obtained in the step 4, stirring, performing flocculation precipitation on the obtained solution, discharging supernatant by using a thickener, and performing plate-and-frame filter pressing separation on precipitated sludge to reduce COD (chemical oxygen demand) of the sewage.
2. The method for reducing COD in sewage with high efficiency and environmental protection as claimed in claim 1, wherein in step 1, the biological agent is K4[Fe(CN)6]、K3[Fe(CN)6]、Fe[N(Si(CH3)3)2]3Any one of them.
3. The method for reducing COD in sewage in high efficiency and environmental protection manner as claimed in claim 1, wherein in the step 1, the oxidant is hydrogen peroxide with mass concentration of 30-35%; the mass ratio of the sewage, the biological agent and the oxidant is 500-800: 1: 2-4.
4. The method for reducing COD in sewage in high efficiency and environmental protection manner according to claim 1, wherein in the step 2, the mass ratio of the activated carbon to the sewage is 1: 600-700; the adsorption time is 10-28 h.
5. The method for reducing COD in sewage with high efficiency and environmental protection according to claim 1, wherein the reaction time of stirring in step 3, step 4 and step 5 is 10-15 minutes.
6. The method for reducing COD in sewage with high efficiency and environmental protection according to claim 1, wherein in the step 5, the mass ratio of the flocculating agent to the sewage is 1: 200-500; the flocculating agent is polyacrylamide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011240725.XA CN112607892A (en) | 2020-11-09 | 2020-11-09 | Efficient and environment-friendly method for reducing COD (chemical oxygen demand) of sewage |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011240725.XA CN112607892A (en) | 2020-11-09 | 2020-11-09 | Efficient and environment-friendly method for reducing COD (chemical oxygen demand) of sewage |
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| CN112607892A true CN112607892A (en) | 2021-04-06 |
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| CN202011240725.XA Pending CN112607892A (en) | 2020-11-09 | 2020-11-09 | Efficient and environment-friendly method for reducing COD (chemical oxygen demand) of sewage |
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| US20070189855A1 (en) * | 2003-07-29 | 2007-08-16 | Dalbir Sethi | Treatment of environmental contaminants |
| CN102020381A (en) * | 2010-12-21 | 2011-04-20 | 大连百佳科技有限公司 | Wastewater treatment process of aquatic products |
| US20150076070A1 (en) * | 2012-02-21 | 2015-03-19 | Nanjing University | Advanced treatment method for biochemical tail water of coking wastewater |
| CN104492025A (en) * | 2014-12-01 | 2015-04-08 | 环境保护部南京环境科学研究所 | Oxidant and method for remedying organic contaminated soil/underground water |
| CN105330102A (en) * | 2015-10-30 | 2016-02-17 | 浙江奇彩环境科技有限公司 | Improved DSD acid production technology |
| CN109071293A (en) * | 2016-08-23 | 2018-12-21 | 倢旸股份有限公司 | The recovery method of heavy metal sewage sludge |
| CN111499033A (en) * | 2020-03-23 | 2020-08-07 | 中国人民解放军陆军防化学院 | Sewage treatment system, sewage treatment vehicle and emergency sewage treatment method |
-
2020
- 2020-11-09 CN CN202011240725.XA patent/CN112607892A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070189855A1 (en) * | 2003-07-29 | 2007-08-16 | Dalbir Sethi | Treatment of environmental contaminants |
| CN102020381A (en) * | 2010-12-21 | 2011-04-20 | 大连百佳科技有限公司 | Wastewater treatment process of aquatic products |
| US20150076070A1 (en) * | 2012-02-21 | 2015-03-19 | Nanjing University | Advanced treatment method for biochemical tail water of coking wastewater |
| CN104492025A (en) * | 2014-12-01 | 2015-04-08 | 环境保护部南京环境科学研究所 | Oxidant and method for remedying organic contaminated soil/underground water |
| CN105330102A (en) * | 2015-10-30 | 2016-02-17 | 浙江奇彩环境科技有限公司 | Improved DSD acid production technology |
| CN109071293A (en) * | 2016-08-23 | 2018-12-21 | 倢旸股份有限公司 | The recovery method of heavy metal sewage sludge |
| CN111499033A (en) * | 2020-03-23 | 2020-08-07 | 中国人民解放军陆军防化学院 | Sewage treatment system, sewage treatment vehicle and emergency sewage treatment method |
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Application publication date: 20210406 |