CN108178249B - Synchronous nitrogen and phosphorus removal method - Google Patents
Synchronous nitrogen and phosphorus removal method Download PDFInfo
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- CN108178249B CN108178249B CN201810025069.8A CN201810025069A CN108178249B CN 108178249 B CN108178249 B CN 108178249B CN 201810025069 A CN201810025069 A CN 201810025069A CN 108178249 B CN108178249 B CN 108178249B
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- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
- C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
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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
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- 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
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
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- 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
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- 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
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
- C02F2101/163—Nitrates
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Abstract
The invention discloses a synchronous nitrogen and phosphorus removal method, and belongs to the field of wastewater treatment. The invention relates to a synchronous nitrogen and phosphorus removal method, which comprises the following steps: A. injecting the wastewater containing nitrogen and phosphorus into a reactor; B. the reference electrode, the electrochemical meter and the cathode are connected; C. switching the switch to an anode B, and regulating and controlling current and voltage by an electrochemical instrument, wherein the anode B is made of a magnesium alloy electrode; D. starting magnetic stirring to make the iron filings in fluidized suspension state; E. adjusting the pH value to be alkalescent; F. turning on a power supply, and removing phosphate and partial ammonia nitrogen in the wastewater through an electrolytic reaction to obtain a product, namely magnesium ammonium phosphate crystals; G. switching the change-over switch to the anode A, and keeping other circuits and the electrochemical instrument in an opening state; H. the surplus ammonia nitrogen and nitrate nitrogen are converted into nitrogen under the action of electrooxidation; I. after the reaction is finished, the power is cut off, and the precipitate is recovered after the supernatant is discharged. The invention can achieve the effect of synchronous denitrification and dephosphorization only by simple switching of the electrodes.
Description
The invention is a divisional application, a parent application number: 2016102235937, respectively; name of mother case: an integrated magnesium ammonium phosphate-electrooxidation device and a synchronous nitrogen and phosphorus removal method thereof; application date of the parent: 2016-4-12.
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a synchronous nitrogen and phosphorus removal method for treating municipal sewage, garbage leakage liquid and wastewater of a fertilizer plant.
Background
With the vigorous development of the sewage treatment industry in China, the national requirements on sewage discharge are more and more strict, but the problem of water eutrophication caused by nitrogen and phosphorus pollution is not only not solved, but also has increasingly serious trend. When the newly issued discharge standard of pollutants for urban sewage treatment plants (GB18918-2002) in 2002 of China requires that the discharged water of all urban sewage treatment plants is discharged into rivers with smaller dilution capacity to be used as urban landscape water, general reuse water and the like, the A standard of the primary standard is executed, namely TN is less than 15mg/L, NH4-N is less than 5mg/L (the water temperature is less than 12 ℃ and less than 8mg/L), and TP is less than 0.5 mg/L. It follows that the main contradiction of sewage treatment has been the shift from the removal of organic pollutants to the removal of nitrogen and phosphorus pollutants. At present, almost all urban sewage treatment plants in China face the same problem that denitrification and dephosphorization cannot achieve the best effect simultaneously, and the reason is as follows:
based on the microbial nitrification and denitrification mechanism: 1. the COD/N/P ratio of the sewage is low, and the shortage of carbon source becomes a limiting factor for denitrification and biological phosphorus removal; 2. the nitrifying bacteria, the denitrifying bacteria and the phosphorus accumulating bacteria have different requirements on the sludge age, the environmental conditions and the like, and the nitrifying bacteria and the phosphorus accumulating bacteria have small quantity and cannot be in respective optimal living states at the same time. In addition, in high latitude areas, the water temperature is lower in autumn and winter, the metabolic activity of microorganisms is weakened, and the removal rate of nitrogen and phosphorus is further reduced.
Research results based on physicochemical processes have derived methods including physical chemical adsorption, stripping, isobutyraldehyde precipitation, electrochemical oxidation, and magnesium ammonium phosphate (MgNH)4PO4·6H2O, Magnesium ammonium phosphate, MAP) crystallization precipitation method, however, in the existing nitrogen and phosphorus pollutant treatment technologies, the technologies such as biological nitrification/denitrification, stripping, physical and chemical adsorption, MAP chemical crystallization, electrochemical oxidation, etc. are difficult to remove elements such as nitrogen and phosphorus in municipal sewage at the same time.
Chinese patent publication No. CN101555068, published: 2009.10.14 discloses a cultivation method of aerobic granular sludge for simultaneous denitrification and dephosphorization of domestic sewage at normal and low temperature, belonging to the field of sewage treatment and characterized in that an SBR reactor adopts a height-diameter ratio of 2-10 and a volume exchange rate of 50-67%, and the water temperature is not regulated. The precipitation time is 30-50 min, and is gradually shortened to 1-3 min; or setting the precipitation time to be 5-8 min, and gradually shortening the precipitation time to 1-3 min. In the biochemical reaction process, the dissolved oxygen concentration DO, the oxidation-reduction potential ORP and the pH value are used as real-time control parameters, and the stirring time (denitrification and phosphorus release) and the aeration time (organic matter oxidation, nitrification, denitrification, aerobic phosphorus absorption and denitrification phosphorus absorption) are controlled in real time. The invention can improve the content of nitrobacteria and phosphorus accumulating bacteria, realize simultaneous nitrogen and phosphorus removal of the low-COD domestic sewage normal-low temperature aerobic granular sludge in an anaerobic/aerobic mode, and solve the problems of low operation efficiency and unstable nitrogen and phosphorus treatment caused by time program control of a sewage treatment system. The invention utilizes the microbial nitrification and denitrification mechanism, chemical agents need to be added, and if the treatment is not good, new secondary pollution is easy to generate.
Disclosure of Invention
1. Technical problem to be solved
The invention provides a synchronous nitrogen and phosphorus removal method, aiming at the technical problems that nitrate nitrogen, ammonia nitrogen and phosphate are difficult to synchronously remove in a sewage treatment process and new pollution is easily generated by treatment based on a microorganism nitrification and denitrification mechanism. The effect of synchronous denitrification and dephosphorization can be achieved only by simply switching the electrodes, the operation is simple, the automatic operation can be realized, and no new pollution source can be generated.
2. Technical scheme
In order to solve the problems, the invention adopts the following technical scheme:
an integrated magnesium ammonium phosphate-electrooxidation device comprises a magnesium ammonium phosphate electrooxidation crystallization system and a nitrogen electrooxidation system, wherein the magnesium ammonium phosphate electrooxidation crystallization system comprises a reaction group and an anode B; the nitrogen electrooxidation system comprises a reaction group and an anode A; the reaction base comprises an electrochemical instrument, a change-over switch, a reference electrode, scrap iron, a cathode and a reactor, wherein: the reference electrode and the cathode are connected in parallel through a lead, are respectively connected with the electrochemical instrument and then are suspended in the reactor in a vertical state, and the scrap iron is suspended in the reactor; the change-over switch is connected with the electrochemical instrument through a lead and then respectively connected with the anode A and the anode B in a switching manner to respectively form a nitrogen electro-oxidation system and an ammonium magnesium phosphate electro-oxidation crystallization system.
In a further scheme, the anode B is made of a magnesium alloy electrode; the iron filings are suspended in the reactor through magnetic stirring; the reference electrode is a mercury or silver chloride electrode.
In a further proposal, the anode A material is DSA (Ti/RuO)2-TiO2-IrO2-SnO2) Or SnO2、IrO2、Ti/RuO2Electrode for electrochemical cell(ii) a The reactor is a tetrafluoroethylene reactor.
In a further scheme, the anode A and the anode B are arranged in parallel in the reactor in a front-back or side-by-side mode, or the anode A and the anode B are positioned on the front-back two sides of the cathode and the cathode are arranged in parallel.
In a further scheme, the change-over switch is an intelligent change-over switch; the cathode material is iron plate.
In a further scheme, the shape of the reactor is round or square.
In a further embodiment, the reactor also comprises a pH-temperature value dual indicator which is vertically inserted and suspended in the reactor.
In a further scheme, the using amount of the scrap iron does not exceed 10 percent of the capacity of the reactor.
A synchronous nitrogen and phosphorus removal method comprises the following specific steps:
A. injecting the wastewater containing nitrogen and phosphorus into a reactor;
B. the reference electrode, the electrochemical instrument and the cathode are connected well, so that the reference electrode, the electrochemical instrument and the cathode are in a working state;
C. switching the change-over switch to the anode B, and regulating and controlling current and voltage by the electrochemical meter;
D. starting magnetic stirring to make the iron filings in fluidized suspension state;
E. adjusting the pH value to be alkalescent;
F. turning on a power supply, and removing phosphate and partial ammonia nitrogen in the wastewater through an electrolytic reaction to obtain a product, namely magnesium ammonium phosphate crystals;
G. switching the change-over switch to the anode A, and keeping other circuits and the electrochemical instrument in an opening state;
H. the surplus ammonia nitrogen and nitrate nitrogen are converted into nitrogen under the action of electrooxidation;
I. after the reaction is finished, the power is cut off, and the precipitate is recovered after the supernatant is discharged.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following remarkable effects:
(1) according to the magnesium ammonium phosphate-electrooxidation integrated device, magnesium is released from magnesium ammonium phosphate crystals by using the magnesium electrode, so that the medicament cost of the magnesium ammonium phosphate crystals is effectively reduced, and the magnesium electrode can be recycled; meanwhile, the purpose of removing nitrogen and phosphate in the wastewater simultaneously can be achieved by adopting two electrodes without adding a new process, and the treatment of nitrate nitrogen is a more headache problem in the existing denitrification process;
(2) the magnesium ammonium phosphate-electrooxidation integrated device embodies the magnesium ammonium phosphate-electrooxidation integrated technology and can synchronously remove ammonia nitrogen, nitrate nitrogen and phosphate in wastewater. The magnesium ammonium phosphate-electrooxidation integrated technology comprises two technical units of magnesium ammonium phosphate crystal dephosphorization and electrooxidation denitrification, wherein a magnesium electrode is adopted to provide magnesium salt, and magnesium ammonium phosphate is formed with ammonia nitrogen and phosphate in wastewater; by anode switching, using DSA or SnO2、IrO2、Ti/RuO2Is used as an anode, and nitrate nitrogen and ammonia nitrogen in the wastewater are removed by an electrooxidation method, so that the aim of synchronously removing nitrate nitrogen, ammonia nitrogen and phosphate in the wastewater is fulfilled. In the prior art, the structure of a reactor and the development of a high-efficiency electrolytic reactor are one of key technologies in the application process of an electrochemical technology, and no application example of an electrooxidation denitrification and dephosphorization integrated reactor exists at present. The invention can achieve the effect of synchronous denitrification and dephosphorization through simple anode switching, simultaneously does not cause secondary pollution to the environment, and is an environment-friendly technology;
(3) the magnesium ammonium phosphate-electrooxidation integrated device is used for solving the problem that electrode passivation cannot be solved in the current electrode reaction process, and the iron filings are filled in a reactor, so that on one hand, the fluidized iron filings have certain impact force and prevent crystal particles from precipitating on the surface of an electrode, and on the other hand, a phenol-like system formed by the iron filings under the action of an electric field plays a role in preventing electrode passivation and is beneficial to oxidative degradation of nitrate nitrogen and ammonia nitrogen;
(4) according to the magnesium ammonium phosphate-electrooxidation integrated device, waste water enters a crystallization reaction tank, scrap iron is kept in a fluidized state through magnetic stirring, current and voltage are accurately controlled through an electrochemical control instrument, a reference electrode is a mercury or silver chloride electrode, a pH meter and a thermometer are externally connected, a magnesium anode and a nitrogen oxide electrode are distributed in parallel or on two sides of a cathode, and automatic switching is realized through a switch; the reactor is round or square, and the electrode distance is freely adjusted;
(5) according to the magnesium ammonium phosphate-electrooxidation integrated device, the anode A and the anode B are arranged in parallel with the cathode in the reactor and generate a phenolton-like system under the synergistic effect of the anode A and the cathode B and fluidized iron chips, so that the purpose of electrooxidation denitrification and dephosphorization integrated reaction can be achieved, the positions of all elements are relatively easy to arrange, the wastewater treatment operation is simple and convenient, and the application range is wide;
(6) according to the magnesium ammonium phosphate-electrooxidation integrated device, when the reactor is circular, scrap iron fluidization is facilitated, dead corners do not exist, magnesium ammonium phosphate crystals can grow favorably, the settling rate of large-particle magnesium ammonium phosphate crystals is higher, and the phosphorus removal efficiency is high;
(7) although the optimum crystallization pH of magnesium ammonium phosphate is 9.0-9.5, the method for synchronously removing nitrogen and phosphorus of the invention has the advantages that the method can be used for synchronously removing nitrogen and phosphorus; magnesium ammonium phosphate crystals can be formed under the condition that the pH value exceeds 7.5, but the cost of alkaline medicaments is increased when the pH value is adjusted too high, so that the magnesium ammonium phosphate crystals are formed at the highest efficiency under the condition that the temperature is 25 ℃ through repeated experiments, data collection and analysis, and the pH value is preferably adjusted to be between 7.5 and 8.5;
(8) the method for synchronously removing nitrogen and phosphorus can be applied to the treatment of wastewater such as municipal sewage, garbage leakage liquid, fertilizer plants and the like, and has wide application range.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of the present invention.
In the figure: 1. an electrochemical meter; 2. a pH-temperature value double display device; 3. a switch; 4. a reference electrode; 5. an anode A; 6. an anode B; 7. scrap iron; 8. a cathode; 9. a reactor.
Detailed Description
The present invention will be described in detail with reference to specific examples.
Example 1
The integrated magnesium ammonium phosphate-electrooxidation device of the present embodiment, as shown in fig. 1, includes a magnesium ammonium phosphate electrooxidation crystallization system and a nitrogen electrooxidation system, wherein the magnesium ammonium phosphate electrooxidation crystallization system includes a reactive group and an anode B6; the nitrogen electrooxidation system comprises a reaction group and an anode A5; the reaction base comprises an electrochemical instrument 1, a selector switch 3, a reference electrode 4, scrap iron 7, a cathode 8 and a reactor 9, wherein: the reference electrode 4 and the cathode 8 are connected in parallel through a lead, are respectively connected with the electrochemical instrument 1 and then are suspended in the reactor 9 in a vertical state, and the scrap iron 7 can be suspended in the reactor 9 through magnetic stirring; the change-over switch 3 and the electrochemical meter 1 are connected by wires and are then switchably connected to the anode a5 and the anode B6, respectively. The anode a5 material is a DSA electrode. The anode B6 material is magnesium alloy electrode. The change-over switch 3 is an intelligent change-over switch; the reference electrode 4 is a mercury electrode; reactor 9 is a tetrafluoroethylene reactor.
The number of each part of the magnesium ammonium phosphate-electrooxidation integrated device in the embodiment is as follows: 1 magnesium alloy electrode, 1DSA electrode (Ti/RuO)2-TiO2-IrO2-SnO2) 1 mercury electrode, 1 electrochemical control instrument, 1 pH meter, 1 thermometer, 1 intelligent change-over switch and a plurality of scrap irons, wherein the scrap iron consumption is not more than 10% of the capacity of the reactor (the scrap iron consumption is too little, the shearing force and the impact force of the scrap iron are limited, and the poor electrode passivation efficiency is prevented; the iron filings are used in too large amount, so that the sludge amount is increased and the fluidization difficulty is greatly increased, and 6% is selected as the optimal iron filings filling rate and 1 tetrafluoroethylene reactor is selected according to the pre-experimental result.
The method for synchronously removing nitrogen and phosphorus in the embodiment comprises the following specific steps:
A. injecting simulated urine wastewater containing nitrogen and phosphorus into a tetrafluoroethylene reactor;
B. the reference electrode 4, the electrochemical instrument 1 and the cathode 8 are connected to be in a working state;
C. switching an intelligent switch to a magnesium alloy electrode, and regulating and controlling current and voltage by an electrochemical instrument 1 according to the concentrations of nitrogen and phosphate in water;
D. starting magnetic stirring to enable the scrap iron 7 to be in a fluidized suspension state;
E. adjusting the pH value to be alkalescent (the pH value of the best crystal of the magnesium ammonium phosphate is 9.0-9.5 after detection, the magnesium ammonium phosphate crystal can be formed under the condition that the pH value exceeds 7.5, but the cost of an alkaline medicament is increased when the pH value is adjusted too high, so the magnesium ammonium phosphate crystal is formed at the highest efficiency under the condition that the temperature is 25 ℃ after repeated experiments, data collection and analysis, and the pH value is preferably adjusted to be 7.5-8.5);
F. turning on a power supply, and removing phosphate and partial ammonia nitrogen in the wastewater through an electrolytic reaction to obtain a product, namely magnesium ammonium phosphate crystals;
G. switching the switch 3 to the anode a5, the other lines and the electrochemical meter 1 remaining open;
H. the surplus ammonia nitrogen and nitrate nitrogen are converted into nitrogen under the action of electrooxidation;
I. after the reaction was completed, the power was turned off, and the precipitate was recovered after the supernatant was discharged, and the treatment results are shown in Table 1.
TABLE 1DSA electrode electrochemical method for treating simulated urine wastewater (Cl)-The concentration is 600mg/L)
| Simulation urine waste water | PO4 3- | NH4 + | NO3- | K+ |
| Concentration (mg/L) | 150 | 900 | 600 | 700 |
| Residual supernatant (mg/L) | 13.5 | 45 | 42 | 350 |
| Removal Rate (%) | 91％ | 95％ | 93％ | 50％ |
Example 2
The basic structure of the magnesium ammonium phosphate-electrooxidation integrated device of this embodiment is as in embodiment 1, except that: the anode A5 is made of SnO2And an electrode. The anode a5 and the anode B6 were arranged in parallel front to back in the reactor 9. The cathode 8 is made of iron plate. Reference electrode 4 is a silver chloride electrode. The method is applied to the treatment of urban sewage.
The experimental result shows that when the anode material is SnO2When using the electrode, the removal rate of phosphate in the municipal sewage is 90.3 percent, but SnO2The electrode is beneficial to HO & accumulation, the removal efficiency of the nitrate nitrogen is slightly higher than that of a DSA electrode and reaches 95%, but the removal efficiency of the ammonia nitrogen is reduced to 91%.
Example 3
The basic structure of the magnesium ammonium phosphate-electrooxidation integrated device of this embodiment is as in embodiment 2, except that: also included is a dual pH-temperature indicator 2 inserted vertically and suspended in the reactor 9. The anode A5 material is IrO2And an electrode. Anode a5 and anode B6 are arranged side-by-side in parallel in reactor 9. The reactor 9 is circular in shape. Is applied to a garbageIn the treatment of the waste leachate.
Experimental results show that the circular reactor is favorable for fluidization of scrap iron, has no dead angle, is favorable for growth of magnesium ammonium phosphate crystals, and has higher settling rate and high phosphorus removal efficiency of large-particle magnesium ammonium phosphate crystals. When the anode of the electrooxidation is IrO2At the electrode, IrO2The electrode has the characteristic of selective oxidation in Cl-Under the condition of a large amount of existing, the removal rate of ammonia nitrogen in the simulated wastewater reaches 97%, and the removal efficiency of nitrate nitrogen also reaches 90.5%.
Example 4
The basic structure of the magnesium ammonium phosphate-electrooxidation integrated device of this embodiment is as in embodiment 2, except that: also included is a dual pH-temperature indicator 2 inserted vertically and suspended in the reactor 9. The anode A5 material is Ti/RuO2And an electrode. The anode a5 and the anode B6 are disposed in parallel with the cathode 8 on the front and rear sides of the cathode 8 in the reactor 9. The reactor 9 is square in shape. The method is applied to the treatment of the wastewater of a fertilizer plant.
Experimental results show that in the reaction process, part of scrap iron and magnesium ammonium phosphate crystals at the corners of the square reactor are not fluidized, so that the efficiency of electro-oxidation phosphorus removal is influenced, and the probability of electrode passivation is increased. And the electro-oxidation anode material is Ti/RuO2When the electrode is used, the removal rates of ammonia nitrogen and nitrate nitrogen are respectively 93.5% and 91.5%.
The invention and its embodiments have been described above schematically and without limitation. Therefore, if a person skilled in the art receives the teachings of the present invention, without inventive design, a similar structure and an embodiment to the above technical solution should be covered by the protection scope of the present patent.
Claims (2)
1. A synchronous nitrogen and phosphorus removal method is characterized by comprising the following specific steps:
A. injecting the wastewater containing nitrogen and phosphorus into a reactor (9);
B. the reference electrode (4), the electrochemical instrument (1) and the cathode (8) are connected well, so that the reference electrode and the electrochemical instrument are in a working state;
C. the change-over switch (3) is switched to the anode B (6), and the electrochemical instrument (1) regulates and controls current and voltage;
D. starting magnetic stirring to enable the scrap iron (7) to be in a fluidized suspension state;
E. adjusting the pH value to be alkalescent;
F. turning on a power supply, and removing phosphate and partial ammonia nitrogen in the wastewater through an electrolytic reaction to obtain a product, namely magnesium ammonium phosphate crystals;
G. the change-over switch (3) is switched to the anode A (5), and other circuits and the electrochemical instrument (1) are kept in an opening state;
H. the surplus ammonia nitrogen and nitrate nitrogen are converted into nitrogen under the action of electrooxidation;
I. after the reaction is finished, the power is cut off, and the precipitate is recovered after the supernatant is discharged;
the anode A material is DSA (Ti/RuO)2-TiO2-IrO2-SnO2) Or SnO2、IrO2、Ti/RuO2An electrode;
the anode B is made of a magnesium alloy electrode.
2. The synchronous denitrification and dephosphorization method according to claim 1, wherein: adjusting the pH value to 7.5-8.5 in the step E; the temperature was at 25 ℃.
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| CN107055889A (en) * | 2017-07-03 | 2017-08-18 | 辽宁科技学院 | A kind of marine culture wastewater efficient electrolysis denitrification dephosphorization apparatus and method |
| CN107265610A (en) * | 2017-08-10 | 2017-10-20 | 滨州学院 | A kind of synchronous sewage disposal and the Bioelectrochemical device of recovery of nitrogen and phosphorus |
| CN108706693B (en) * | 2018-05-24 | 2021-11-26 | 天津大学 | Switchable three-electrode reactor for treating suspended matters and refractory organic pollutants |
| CN109022491B (en) * | 2018-08-20 | 2021-08-24 | 山东大学 | Hydrogen alkane fermentation coupling recycling process for poultry and livestock manure |
| CN108977823B (en) * | 2018-08-30 | 2020-05-19 | 湖北美辰环保科技有限公司 | Nitrogen, phosphorus and fluorine recovery method based on electrochemical reactor |
| CN109264834B (en) * | 2018-11-05 | 2020-12-25 | 中国地质大学（北京） | Treatment method and reactor for nitrogen-containing chlorine-containing degradation-resistant organic wastewater |
| CN109609970B (en) * | 2018-12-21 | 2021-02-26 | 北京林业大学 | System and method for promoting recovery of potassium in urine wastewater through magnesium anode electro-corrosion |
| CN109796068A (en) * | 2019-03-19 | 2019-05-24 | 中国地质大学（北京） | A kind of integrated reformer handling nitrogenous organic wastewater and method |
| CN114853235A (en) * | 2022-04-22 | 2022-08-05 | 长江水利委员会长江科学院 | Electric nitrogen and phosphorus double-anode cooperative recovery device and method for drainage pore water |
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| JP2003236563A (en) * | 2002-02-20 | 2003-08-26 | Yamato:Kk | Method and device for treating phosphorus containing waste water |
| JP2004097949A (en) * | 2002-09-10 | 2004-04-02 | Sanyo Electric Co Ltd | Wastewater treatment system |
| KR100453479B1 (en) * | 2004-01-16 | 2004-10-15 | (주)워러모드 | A-SBR plant for removing nitrogen and phosphorus from wastewater |
| CN101549896A (en) * | 2009-05-07 | 2009-10-07 | 上海交通大学 | Integrated electrolysis nitrogen and phosphorus removal wastewater treatment method |
| CN103754993B (en) * | 2014-01-28 | 2015-12-02 | 哈尔滨工业大学 | A kind of water treatment system synchronously removes the method for ammonia nitrogen and nitrate nitrogen in water |
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| CN205527897U (en) * | 2016-04-12 | 2016-08-31 | 景德镇陶瓷学院 | Magnesium ammonium phosphate - electroxidation integration device |
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