CN112707379A - Method for treating high ammonia nitrogen wastewater and recovering ammonia and magnesium ammonium phosphate reactor suitable for method - Google Patents
Method for treating high ammonia nitrogen wastewater and recovering ammonia and magnesium ammonium phosphate reactor suitable for method Download PDFInfo
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- CN112707379A CN112707379A CN202011601406.7A CN202011601406A CN112707379A CN 112707379 A CN112707379 A CN 112707379A CN 202011601406 A CN202011601406 A CN 202011601406A CN 112707379 A CN112707379 A CN 112707379A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/26—Phosphates
- C01B25/45—Phosphates containing plural metal, or metal and ammonium
- C01B25/451—Phosphates containing plural metal, or metal and ammonium containing metal and ammonium
Abstract
The invention relates to a method for treating high ammonia nitrogen wastewater and recovering ammonia, which comprises the following steps: adding a magnesium-containing compound and phosphate ions into the high ammonia nitrogen wastewater, and reacting to generate magnesium ammonium phosphate; collecting the precipitate in the reacted system, washing and drying to obtain an ammonium magnesium phosphate product; collecting the supernatant in the reacted system, performing biochemical treatment, and discharging after reaching the standard. The invention also relates to an ammonium magnesium phosphate reactor suitable for the treatment method, which comprises a reaction tank and a sedimentation tank communicated with the reaction tank, wherein the sedimentation tank is arranged at the rear end of the reaction tank; an aeration device is arranged in the reaction tank. According to the method, the magnesium-containing compound and the phosphate ions are added to precipitate ammonia in the high ammonia-nitrogen wastewater to generate magnesium ammonium phosphate which can be used as a fertilizer, so that the wastewater is effectively purified, the resource recycling is realized, the resource waste is reduced, and the sustainable development is facilitated.
Description
Technical Field
The invention belongs to the technical field of water treatment, and particularly relates to a method for treating high ammonia nitrogen wastewater and recovering ammonia and an ammonium magnesium phosphate reactor suitable for the method.
Background
With the rapid development of chemical industry, printing and dyeing, chemical fertilizer and other industries, the generated high ammonia nitrogen wastewater becomes a restriction factor for the development of the industries. The number of red tides in the sea area of China is increased, ammonia nitrogen is one of the main pollution factors, and particularly the pollution caused by high-concentration ammonia nitrogen wastewater. Therefore, the economic and effective control of high-concentration ammonia nitrogen also becomes an important subject of research of current environmental protection workers, and is highly valued by the industry people.
The ammonia nitrogen wastewater is discharged into a water body, particularly a lake and a bay which flow slowly, algae and other microorganisms in the water are easy to breed in a large quantity to form eutrophication pollution, on one hand, the running of a tap water treatment plant is difficult, the peculiar smell of drinking water is caused, on the other hand, the dissolved oxygen in the water is reduced, fishes die in a large quantity, and even the lake is killed. The ammonia nitrogen also increases the chlorine consumption in the processes of water disinfection and industrial circulating water sterilization treatment, and has corrosiveness on certain metals, particularly copper. When the sewage is recycled, the microorganisms in the regenerated water can promote the propagation of the microorganisms in the water conveying pipe and the water using equipment, so that the pipelines and the water using equipment are blocked after the microorganisms are formed, and the heat exchange efficiency is influenced.
The general formation of ammonia nitrogen wastewater is caused by the coexistence of ammonia water and inorganic ammonia, and the main source of ammonia nitrogen in wastewater with pH above neutral is the combined action of the inorganic ammonia and the ammonia water; the ammonia nitrogen in the wastewater under acidic conditions is mainly caused by inorganic ammonia. There are many methods for treating ammonia nitrogen effectively, such as various methods of stripping, ion exchange, coagulating sedimentation, reverse osmosis, electrodialysis and various Advanced Oxidation Technologies (AOTs) by physical and chemical methods; the biological method comprises nitrification and aquatic plant culture such as algae. But the ammonia nitrogen treatment technology with the advantages of convenient application, stable treatment effect, economical and green recovery of available ammonia and the like is still under research.
Patent document CN207046874U discloses a resource treatment system for recovering ammonia from ammonia nitrogen wastewater. According to the method, a mechanical compressor is installed on the top of a rectifying tower and is connected with a reboiler installed on a tower kettle, vapor on the top of the rectifying tower is compressed into superheated vapor and enters the reboiler to be condensed to release phase change heat, so that a heat source is provided for the rectifying tower, no additional heat source is required except for the initial start-up stage, and ammonia water recovery and wastewater standard discharge are realized. However, the rectifying tower and the like have high requirements on equipment and consume large power resources.
Patent document CN106277480B discloses a treatment process of high-concentration ammonia nitrogen wastewater. The method comprises the steps of diluting high ammonia nitrogen wastewater by tap water, pumping the diluted high ammonia nitrogen wastewater into a micro-electrolysis tank for aeration, performing coagulation reaction, and allowing supernatant obtained after precipitation to flow into a breakpoint chlorination tank for oxidation reaction. The ammonia nitrogen wastewater treatment process provided by the invention has the disadvantages of high medicament cost input ratio and high cost due to the use of the coagulating medicament and the sodium hypochlorite.
Patent document CN210973967U discloses a denitrification device for high ammonia nitrogen wastewater. The method blows off the waste water entering the blow-off tower from the gap of the tower top shunting device through a blower at the bottom end of the blow-off tower by blowing off and denitrogenating, so that the waste water is fully contacted with the air to achieve the aim of reducing the concentration of ammonia nitrogen in the waste water. The method needs a large amount of alkali to realize the escape of ammonia nitrogen, and has large economic investment.
Disclosure of Invention
The invention aims to overcome the defects of the related technology and provide a method for treating high ammonia nitrogen wastewater and recovering ammonia, which has the advantages of few treatment processes, low medicament and energy cost and low requirement on devices, and an ammonium magnesium phosphate reactor suitable for the method.
In order to achieve the purpose, the invention adopts the technical scheme that: a method for treating high ammonia nitrogen wastewater and recovering ammonia comprises the following steps:
adding a magnesium-containing compound and phosphate ions into the high ammonia nitrogen wastewater, and reacting to generate magnesium ammonium phosphate;
collecting the precipitate in the reacted system, washing and drying to obtain an ammonium magnesium phosphate product;
collecting the supernatant in the reacted system, performing biochemical treatment, and discharging after reaching the standard.
Preferably, the magnesium-containing compound is a covalent compound containing magnesium or a salt containing magnesium.
As a more preferred embodiment, the phosphate ions are introduced by phosphoric acid or phosphate.
As a more preferable embodiment, the ratio of N: the molar ratio of P is 1:1: 1.
As a preferred scheme, phosphate ions and high ammonia nitrogen wastewater are mixed and then a magnesium-containing compound is added; an aeration device is adopted to aerate the reaction system in the reaction process.
As a more preferable scheme, the reaction time of the high ammonia nitrogen wastewater, the magnesium-containing compound and phosphate ions is 1.5-2 h.
As a preferable scheme, the precipitate is washed and then dried at low temperature, and the low-temperature drying temperature is 40-60 ℃.
Preferably, the biochemical treatment comprises activated sludge treatment and ozone-BAF coupling treatment.
As a more preferable scheme, the retention time of the wastewater in the activated sludge section is 20-35 h; the retention time of the wastewater in the ozone-BAF coupling section is 10-15 h.
The technical scheme of the invention also comprises an ammonium magnesium phosphate reactor suitable for the method for treating the high ammonia-nitrogen wastewater and recovering ammonia, which comprises a reaction tank and a sedimentation tank communicated with the reaction tank, wherein the sedimentation tank is arranged at the rear end of the reaction tank;
an aeration device is arranged in the reaction tank; the reaction tank is communicated with a high ammonia nitrogen wastewater pipe, and the high ammonia nitrogen wastewater pipe is also communicated with a phosphate radical ion pipe; a magnesium-containing compound feeding hopper is arranged at the rear end of the high ammonia nitrogen wastewater pipe of the reaction tank;
the bottom of the sedimentation tank is provided with a magnesium ammonium phosphate outlet, and the side wall of the sedimentation tank is provided with a supernatant outlet.
The invention has the beneficial technical effects that: provides a method for treating high ammonia nitrogen wastewater and recovering ammonia with less treatment processes, low medicament and energy cost and low requirement on equipment and an ammonium magnesium phosphate reactor suitable for the method.
(1) According to the method, the magnesium-containing compound and the phosphate ions are added to precipitate ammonia in the high ammonia-nitrogen wastewater to generate magnesium ammonium phosphate which can be used as a fertilizer, so that the wastewater is effectively purified, the resource recycling is realized, the resource waste is reduced, and the sustainable development is facilitated.
(2) The method has the advantages of reaction at normal temperature and normal pressure, low reaction energy consumption, low cost of used reagents, no strict requirement on equipment, contribution to saving cost and improvement of economic benefit.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic flow chart of a processing method in embodiment 1 of the present invention.
FIG. 2 is a schematic diagram of the magnesium ammonium phosphate reactor of example 1 of the present invention.
In the figure: 1-a reaction tank; 11-an aeration device; 2-a sedimentation tank; 21-magnesium ammonium phosphate outlet; 22-supernatant outlet; 3-a pipeline; 4-high ammonia nitrogen wastewater pipe; a 5-phosphate ion tube; 6-magnesium-containing compound feed hopper.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings and examples, which are given by way of illustration only, and not by way of limitation, and are not intended to limit the scope of the invention.
At present, ammonia nitrogen pollution is one of the main factors of environmental pollution. It not only can cause eutrophication of the water body and destroy the ecological environment of the water body, but also can cause the waste of a large amount of resources. In ammonia nitrogen treatment, the problems of high energy consumption, strict requirements on equipment, overhigh medicament charge input proportion and overlarge economic input cost are often encountered. The inventor finds out through research that: a large amount of free nitrogen in the ammonia nitrogen wastewater can be combined with magnesium and phosphate radical ions to generate magnesium ammonium phosphate, and the magnesium ammonium phosphate can be used for fertilizers, so that the ammonia nitrogen content in a water body is reduced, resources are effectively recycled, and the effect of killing two birds with one stone is achieved. Then the treated ammonia nitrogen wastewater is subjected to activated sludge and ozone-BAF coupling treatment, so that pollutants such as COD (chemical oxygen demand) in the wastewater can be removed, and water which can reach the discharge standard is obtained.
In the present processing method:
firstly, a magnesium-containing compound and phosphate ions are added into the high ammonia nitrogen wastewater, and through the combination of magnesium and phosphate ions and free ammonium in the wastewater, magnesium ammonium phosphate precipitation which can be used for fertilizer is generated through reaction. Not only realizes the removal of ammonia nitrogen in the wastewater, but also realizes the recycling of resources.
The reaction equation of this step is: mg (magnesium)2++PO4 3-+NH4 ++6H2O＝MgNH4PO4·6H2O。
Secondly, collecting the precipitate in the system after reaction, wherein the precipitate is a magnesium ammonium phosphate crude product; washing the magnesium ammonium phosphate with clear water for many times, and drying to obtain the magnesium ammonium phosphate slow-release product.
Finally, only ammonia nitrogen in the wastewater can be removed by a magnesium and phosphate radical ion precipitation method, and the wastewater also contains pollutants such as COD (chemical oxygen demand) and the like; therefore, the supernatant in the reacted system is subjected to biochemical treatment to remove pollutants such as COD (chemical oxygen demand) in the wastewater, and the wastewater is discharged after reaching the standard.
In the above method, the magnesium-containing compound is preferably a covalent compound containing magnesium or a salt containing magnesium, such as magnesium oxide, magnesium chloride, or the like; the reaction activity is good, and the raw materials are widely and easily available. Phosphate ions are preferably introduced by phosphoric acid or phosphate, especially phosphoric acid, which, in cooperation with magnesium oxide, can effectively bind with free ammonium in the ammonia nitrogen wastewater. N is Mg: the molar ratio of P is preferably 1:1: 1. meanwhile, phosphate ions are preferably added firstly in the sequence of adding the magnesium-containing compound and the phosphate ions into the high ammonia nitrogen wastewater, so that the reaction is more fully performed; and simultaneously, preferably, when the magnesium-containing compound and the phosphate ions are mixed with free ammonium for reaction, an aeration device is adopted to aerate the reaction system, and the components are fully reacted by utilizing gas-liquid mixing power. The reaction time of the high ammonia nitrogen wastewater, the magnesium-containing compound and the phosphate ions is preferably 1.5-2 h.
The obtained magnesium ammonium phosphate sediment is repeatedly washed for 3-5 times by a small amount of clean water, and then dried at low temperature, wherein the drying temperature is preferably controlled at 40-60 ℃, because the crystallization of magnesium ammonium phosphate is not facilitated under the high temperature condition.
The biochemical treatment is preferably activated sludge treatment and ozone-BAF (biological aerated filter) coupling treatment; the former has the advantages of stable treatment effect, high removal rate of BOD5, COD, SS, N and P, strong impact resistance, strong adsorption capacity, strong buffering capacity for pH value and toxic substances and less energy consumption. In the latter, the ozone oxidation is that hydroxyl free radical (. OH) is used as main oxidant to react with organic matter, and the generated organic free radical can continue to participate in hydroxyl free radical chain reaction, and can also form organic peroxide free radical to further carry out oxidative decomposition reaction, thereby oxidizing macromolecular organic matter into micromolecular intermediate product, improving the biodegradability of organic pollutant in water, and providing good foundation for the treatment of the biological aerated filter. The biological aeration filter treatment is a biofilm treatment. The method utilizes the action of high-concentration active microorganisms in a biological membrane attached to a filter material and the characteristic of small particle size of the filter material, fully exerts the biological metabolism, biological flocculation, physical adsorption and interception of the biological membrane and a filler and the graded predation action of a food chain in a reactor along the water flow direction, and realizes the efficient removal of pollutants. The ozone and the microorganism are cooperated to carry out strengthening treatment, so that most of the sewage organic matters are degraded. Therefore, pollutants such as COD in the wastewater can be effectively removed through the combined action of activated sludge treatment and ozone-BAF coupling treatment.
In addition, the magnesium ammonium phosphate reactor suitable for the method for treating the high-ammonia-nitrogen wastewater and recovering ammonia comprises a reaction tank and a sedimentation tank which are communicated through a pipeline; the sedimentation tank is arranged at the rear end of the reaction tank;
an aeration device is arranged in the reaction tank; the reaction tank is communicated with the high ammonia nitrogen wastewater pipe, and the high ammonia nitrogen wastewater pipe is also communicated with a phosphate radical ion pipe; in addition, a magnesium-containing compound feeding hopper is arranged at the rear end of the high ammonia nitrogen wastewater pipe of the reaction tank, so that phosphate ions are added firstly, and then a magnesium-containing compound is added. The bottom of the sedimentation tank is provided with a magnesium ammonium phosphate outlet, and the side wall of the sedimentation tank is provided with a supernatant outlet.
Through the device, phosphate ions are firstly mixed with the high ammonia nitrogen wastewater and then mixed with a magnesium-containing compound for reaction; after the full mixing reaction, the reactant flows into a sedimentation tank for sedimentation, and the supernatant flows into a subsequent biochemical system through a supernatant outlet.
Example 1
The embodiment discloses a method for treating high ammonia nitrogen wastewater and recovering ammonia.
The wastewater is dye wastewater, COD is 3000-4000mg/L, ammonia nitrogen is 5000-6000mg/L, and pH is 7.5-8.1.
Referring to fig. 1, the specific steps of the process:
(1) detecting the ammonia nitrogen content in the wastewater, and performing the following steps according to N: mg: the molar ratio of P is 1:1:1 weighing magnesium oxide and phosphoric acid; wherein the magnesium oxide is in powder form and the phosphoric acid is in industrial grade. Firstly, adding phosphoric acid into the wastewater, then adding magnesium oxide powder, and simultaneously aerating the wastewater by adopting an aeration device to ensure that the components are contacted and reacted more fully. Combining the magnesium oxide powder and the phosphoric acid with free ammonium in the wastewater, and reacting for 1.5h to generate magnesium ammonium phosphate precipitate.
The specific reaction formula is as follows: MgO + H3PO4+NH4 ++5H2O＝MgNH4PO4·6H2O+H+。
(2) After full reaction, the sediment is settled, and the supernatant flows into a subsequent biochemical treatment system.
(3) The precipitate is discharged every 2 hours to obtain a magnesium ammonium phosphate crude product; and (3) washing the magnesium ammonium phosphate crude product with a small amount of clear water for 3 times, and drying at 40-60 ℃ to obtain the magnesium ammonium phosphate compound fertilizer.
(4) COD in the supernatant is not removed basically, and the removal rate of ammonia nitrogen reaches 90-95%; enabling the supernatant to enter an integrated gradient-free activated sludge CGR device for activated sludge treatment; wherein the retention time (HRT) is 20-35 h; the COD of the effluent is 120-150mg/l, and the removal rate of the COD reaches 96 percent.
(5) After the CGR goes out of water, the CGR enters an ozone-BAF coupling device to carry out ozone-BAF treatment for HRT (Rockwell temperature) 10-15h, and COD (chemical oxygen demand) effluent is lower than 60mg/L and reaches the dischargeable standard.
Referring to fig. 2, the invention also discloses a magnesium ammonium phosphate reactor suitable for the method for treating the high ammonia-nitrogen wastewater and recovering ammonia, which comprises a reaction tank 1 and a sedimentation tank 2 which are communicated through a pipeline 3; the sedimentation tank 2 is arranged at the rear end of the reaction tank 1.
An aeration device 11 is arranged at the bottom in the reaction tank 1; meanwhile, the side wall of the reaction tank 1 is provided with an inlet and is communicated with the high ammonia nitrogen wastewater pipe 4. The high ammonia nitrogen wastewater pipe 4 is also communicated with a phosphate radical ion pipe 5; in addition, the reaction tank 1 is also connected with a magnesium-containing compound feeding hopper 6 which is positioned at the rear end of the high ammonia nitrogen wastewater pipe 4, so that the magnesium-containing compound is added after phosphate ions are added.
And an ammonium magnesium phosphate outlet 21 is formed in the bottom of the sedimentation tank 2 and used for discharging an ammonium magnesium phosphate crude product. The side wall of the sedimentation tank 2 is provided with a supernatant outlet 22 for discharging the supernatant to the subsequent biochemical process.
Example 2
The embodiment discloses a method for treating high ammonia nitrogen wastewater and recovering ammonia.
The wastewater is dye wastewater, COD is 6000mg/L at 5000-6000mg/L, ammonia nitrogen is 8000mg/L at 7000-8000mg/L, and pH is 7.5-8.1.
The specific steps of the treatment are as follows:
(1) detecting the ammonia nitrogen content in the wastewater, and performing the following steps according to N: mg: the molar ratio of P is 1:1:1 weighing magnesium oxide and phosphoric acid; wherein the magnesium oxide is in powder form and the phosphoric acid is in industrial grade. Firstly, adding phosphoric acid into the wastewater, then adding magnesium oxide powder, and simultaneously aerating the wastewater by adopting an aeration device to ensure that the components are contacted and reacted more fully. Combining the magnesium oxide powder and the phosphoric acid with free ammonium in the wastewater, and reacting for 2h to generate magnesium ammonium phosphate precipitate.
(2) After full reaction, the sediment is settled, and the supernatant flows into a subsequent biochemical treatment system.
(3) The precipitate is discharged every 1.5h to obtain a magnesium ammonium phosphate crude product; and (3) washing the magnesium ammonium phosphate crude product with a small amount of clear water for 5 times, and drying at 40-60 ℃ to obtain the magnesium ammonium phosphate compound fertilizer.
(4) COD in the supernatant is not removed basically, and the removal rate of ammonia nitrogen reaches 90-95%; enabling the supernatant to enter an integrated gradient-free activated sludge CGR device for activated sludge treatment; wherein the retention time (HRT) is 20-35 h; the COD of the effluent is 200-250mg/L, and the removal rate of the COD reaches 96 percent.
(5) After the CGR goes out of water, the CGR enters an ozone-BAF coupling device to carry out ozone-BAF treatment for HRT (Rockwell temperature) 10-15h, and COD (chemical oxygen demand) effluent is lower than 60mg/L and reaches the dischargeable standard.
The invention also discloses a magnesium ammonium phosphate reactor suitable for the method for treating the high ammonia-nitrogen wastewater and recovering ammonia, which has the same structure as the magnesium ammonium phosphate reactor in the embodiment 1.
In light of the foregoing description of the preferred embodiments of the present invention, it is to be understood that various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present application is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. A method for treating high ammonia nitrogen wastewater and recovering ammonia is characterized in that: the method comprises the following steps:
adding a magnesium-containing compound and phosphate ions into the high ammonia nitrogen wastewater, and reacting to generate magnesium ammonium phosphate;
collecting the precipitate in the reacted system, washing and drying to obtain an ammonium magnesium phosphate product;
collecting the supernatant in the reacted system, performing biochemical treatment, and discharging after reaching the standard.
2. The method for treating high ammonia nitrogen wastewater and recovering ammonia according to claim 1, which is characterized in that: the magnesium-containing compound is a covalent compound containing magnesium or a salt containing magnesium.
3. The method for treating high ammonia nitrogen wastewater and recovering ammonia according to claim 2, characterized in that: the phosphate ions are introduced by phosphoric acid or phosphate.
4. The method for treating high ammonia nitrogen wastewater and recovering ammonia according to claim 3, characterized in that: n is Mg: the molar ratio of P is 1:1: 1.
5. The method for treating high ammonia nitrogen wastewater and recovering ammonia according to claim 1, which is characterized in that: firstly, mixing phosphate ions and high ammonia nitrogen wastewater, and then adding a magnesium-containing compound; an aeration device is adopted to aerate the reaction system in the reaction process.
6. The method for treating high ammonia nitrogen wastewater and recovering ammonia according to claim 5, characterized in that: the reaction time of the high ammonia nitrogen wastewater, the magnesium-containing compound and the phosphate ions is 1.5-2 h.
7. The method for treating high ammonia nitrogen wastewater and recovering ammonia according to claim 1, which is characterized in that: and washing the precipitate, and drying at low temperature of 40-60 ℃.
8. The method for treating high ammonia nitrogen wastewater and recovering ammonia according to claim 1, which is characterized in that: the biochemical treatment comprises activated sludge treatment and ozone-BAF coupling treatment.
9. The method for treating high ammonia nitrogen wastewater and recovering ammonia according to claim 8, characterized in that: the retention time of the wastewater in the active sludge section is 20-35 h; the retention time of the wastewater in the ozone-BAF coupling section is 10-15 h.
10. An ammonium magnesium phosphate reactor suitable for the method for treating the high ammonia nitrogen wastewater and recovering ammonia according to any one of claims 1 to 9, which is characterized in that: the device comprises a reaction tank and a sedimentation tank communicated with the reaction tank, wherein the sedimentation tank is arranged at the rear end of the reaction tank;
an aeration device is arranged in the reaction tank; the reaction tank is communicated with a high ammonia nitrogen wastewater pipe, and the high ammonia nitrogen wastewater pipe is also communicated with a phosphate radical ion pipe; a magnesium-containing compound feeding hopper is arranged at the rear end of the high ammonia nitrogen wastewater pipe of the reaction tank;
the bottom of the sedimentation tank is provided with a magnesium ammonium phosphate outlet, and the side wall of the sedimentation tank is provided with a supernatant outlet.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114275967A (en) * | 2021-12-13 | 2022-04-05 | 天津渤化永利化工股份有限公司 | Treatment method of high-concentration ammonia nitrogen wastewater |
| CN115677069A (en) * | 2021-07-23 | 2023-02-03 | 中国石油天然气股份有限公司 | Treatment method of excess sludge |
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| CN102531274A (en) * | 2010-12-31 | 2012-07-04 | 上海轻工业研究所有限公司 | Treatment method for ammonia nitrogen and COD (Chemical Oxygen Demand) in surface treatment waste water |
| US20150336830A1 (en) * | 2014-05-22 | 2015-11-26 | Dennis A. Burke | Removal and recovery of phosphate from liquid streams |
| CN207330633U (en) * | 2017-08-14 | 2018-05-08 | 义马煤业综能新能源有限责任公司 | A kind of utilization system of high-ammonia nitrogen low C OD waste water |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101148301A (en) * | 2007-08-21 | 2008-03-26 | 南京大学 | Method for removing ammonia and nitrogen from coking wastewater |
| CN102531274A (en) * | 2010-12-31 | 2012-07-04 | 上海轻工业研究所有限公司 | Treatment method for ammonia nitrogen and COD (Chemical Oxygen Demand) in surface treatment waste water |
| US20150336830A1 (en) * | 2014-05-22 | 2015-11-26 | Dennis A. Burke | Removal and recovery of phosphate from liquid streams |
| CN207330633U (en) * | 2017-08-14 | 2018-05-08 | 义马煤业综能新能源有限责任公司 | A kind of utilization system of high-ammonia nitrogen low C OD waste water |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115677069A (en) * | 2021-07-23 | 2023-02-03 | 中国石油天然气股份有限公司 | Treatment method of excess sludge |
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