CN111253003A - Three-dimensional electrochemical coupling three-dimensional electric biological coking wastewater treatment system - Google Patents
Three-dimensional electrochemical coupling three-dimensional electric biological coking wastewater treatment system Download PDFInfo
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- CN111253003A CN111253003A CN202010063422.9A CN202010063422A CN111253003A CN 111253003 A CN111253003 A CN 111253003A CN 202010063422 A CN202010063422 A CN 202010063422A CN 111253003 A CN111253003 A CN 111253003A
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/005—Combined electrochemical biological processes
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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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F2101/30—Organic 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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/16—Total nitrogen (tkN-N)
Abstract
The invention discloses a three-dimensional electrochemical coupling three-dimensional electric biological coking wastewater treatment system, which is characterized in that the wastewater treatment system consists of electrochemical and electric biological treatment, wherein the electrochemical treatment comprises two reactors which are formed by composite activated carbon particle electrodes filled between an anode and a cathode; the electric biological treatment comprises two reactors composed of biomembrane particle electrodes filled between an anode and a cathode; the upper parts of the cathode chamber and the anode chamber of the reactor are provided with a water inlet and a water outlet, and the lower parts of the cathode chamber and the anode chamber are provided with aeration ports. Compared with the prior art, the device has the advantages of simple structure, convenient operation, low system energy consumption, high wastewater degradation efficiency and easy realization of industrial application, provides a new solution for coking wastewater treatment, and is beneficial to promoting the application of the three-dimensional electrochemical technology in the field of sewage treatment.
Description
Technical Field
The invention relates to the technical field of coking wastewater treatment devices, in particular to a three-dimensional electrochemical coupling three-dimensional electric biological coking wastewater treatment system.
Background
The coking wastewater mainly comes from the processes of coking, gas purification, refining of chemical products and the like, has complex components and poor biodegradability, and is typical non-degradable toxic and harmful industrial wastewater. The coking wastewater contains complex organic and inorganic pollutants such as phenols, benzenes, nitrogen-containing heterocyclic organic matters, polycyclic aromatic hydrocarbons, ammonia nitrogen, cyanides, sulfides, thiocyanides and the like, the complex pollutants are various in types, high in concentration and high in toxicity, and the conventional biochemical process treatment is difficult to discharge after reaching the standard due to the special properties of the wastewater.
At present, most of treatment processes for coking wastewater are biochemical methods, including anaerobic-aerobic (A/O), anaerobic-anoxic-aerobic (A/A/O) and other processes. However, the pollutants in the coking wastewater have complex structures and strong biological toxicity, so that the effluent of a biochemical system is not ideal and cannot reach the national emission standard. Physical and chemical methods such as coagulation, precipitation, adsorption, ion exchange and the like are commonly used for pretreatment of coking wastewater, but the methods have the defects of large dosage, high price, large amount of generated sludge, difficult regeneration of an adsorbent, easy secondary pollution and the like, so that the methods are difficult to apply on a large scale.
The electrochemical method has the advantages of high treatment efficiency, simple equipment, simple operation, no secondary pollution and the like. The three-dimensional electrode reactor is characterized in that conductive particles are filled between a cathode plate and an anode plate of a traditional electrolytic tank, and the two ends of the particles are respectively charged with positive charges and negative charges under the action of an electric field of a main electrode to form a third-dimensional particle electrode, so that the electrolytic efficiency is improved, and the treatment performance of the reactor is enhanced. The three-dimensional electrode reactor can generate a large amount of active oxidation substances such as hydroxyl free radicals and the like in the electrolytic process, has strong oxidizability, and can oxidize organic matters in wastewater into carbon dioxide, thereby achieving the purpose of removing pollutants. In recent years, three-dimensional electrochemical treatment technology has been applied to the treatment of high-concentration refractory organic wastewater, and although some progress is made in small-scale and reactor design, the problems of high running energy consumption and the like still exist. At present, no report and published technology for degrading wastewater by coupling a three-dimensional electrochemical reactor and a three-dimensional electric bioreactor is available.
Disclosure of Invention
The invention aims at the defects of the prior art to design a three-dimensional electrochemical coupling three-dimensional electric biological coking wastewater treatment system, which adopts a biomembrane technology to be coupled with a three-dimensional electrochemical reactor, and carries out enhanced degradation on high-concentration refractory organic wastewater under the synergistic action of electricity and microorganisms by an electroactive biomembrane cultured on a particle electrode interface, generates a large amount of active oxidation substances in the electrolytic process, has strong oxidizability, can oxidize organic matters in the wastewater into carbon dioxide so as to achieve the aim of removing pollutants, and the coking wastewater is treated by two-stage electrochemistry and two-stage electric biological units, thereby not only improving the removal efficiency of the pollutants, but also avoiding the hydraulic short-flow phenomenon under the continuous operation condition, having low system energy consumption, high wastewater degradation efficiency, simple structure and convenient operation, being easy to realize industrial application, and providing a new solution for coking wastewater treatment, the method can efficiently degrade coking wastewater, can save energy consumption, and is beneficial to promoting the application of the three-dimensional electrochemical technology in the field of sewage treatment.
The purpose of the invention is realized as follows: a three-dimensional electrochemical coupling three-dimensional electric biological coking wastewater treatment system is characterized in that the coking wastewater treatment system consists of a three-dimensional electric biological treatment unit, a pulse power supply and a direct current power supply, wherein the three-dimensional electric biological treatment unit is connected with the three-dimensional electric biological treatment unit through an intermediate water collecting tank; peristaltic pumps are arranged on serial pipelines of the two three-dimensional electrode reactors; the three-dimensional electric biological treatment unit consists of another two three-dimensional electrode reactors connected in series and a biological film particle electrode filled between the anode plate and the cathode plate; another peristaltic pump is arranged on a serial pipeline of the other two three-dimensional electrode reactors; a peristaltic pump is arranged on a pipeline connecting the middle water collecting tank and the three-dimensional electric biological unit; the upper parts of the cathode chamber and the anode chamber of the three-dimensional electrode reactor are provided with a water inlet and a water outlet, and the lower parts of the cathode chamber and the anode chamber are provided with aeration ports.
The coking wastewater is input into the three-dimensional electrochemical treatment unit by the peristaltic pump for primary wastewater treatment, and then is input into the three-dimensional electrobiological treatment unit for secondary wastewater treatment. The reactor filling composite active carbon particle electrode of the three-dimensional electrochemical treatment unit is characterized in that metal oxides (copper oxide, manganese dioxide and ferric oxide) in a certain proportion are loaded on the surface of granular active carbon by a dipping and calcining method; the reactor filling biomembrane particle electrode of the three-dimensional electric biological treatment unit is granular activated carbon hanging with a biomembrane, and the surface of the reactor filling biomembrane particle electrode is enriched with an electric active biomembrane for degrading coking wastewater; filling the granular activated carbon with the biofilm hanging function in a reactor of a three-dimensional electric biological unit to serve as a biofilm carrier, inoculating activated sludge, taking coking wastewater treated by the three-dimensional electrochemical treatment unit as a substrate, and acclimating for 25-35 days by using 10-20 mA current provided by a direct current power supply until a brown biofilm is observed on the surface of the granular activated carbon; the volume ratio of filling particle electrodes of the three-dimensional electrode reactor is 50-70%; the three-dimensional electrochemical processing unit is powered by a pulse power supply, the voltage of the three-dimensional electrochemical processing unit is 8-20V, the duty ratio of the three-dimensional electrochemical processing unit is 50-80%, and the frequency of the three-dimensional electrochemical processing unit is 1000 Hz; the three-dimensional electric biological treatment unit is powered by a direct-current power supply in operation, and the voltage of the three-dimensional electric biological treatment unit is 3-10V; the composite activated carbon particle electrode needs to be regenerated after running for 24-96 hours; and the regeneration is to add tap water into a reactor for two-stage treatment, maintain the conventional operation condition, perform electrolysis treatment for 15-60 minutes, discharge sewage after the regeneration is finished, and input coking wastewater into the reactor for electrochemical treatment.
Compared with the prior coking wastewater treatment technology, the method has the following advantages:
1) the reactor takes a supported activated carbon catalyst as a particle electrode, which can effectively promote the generation of active oxidation substances such as hydroxyl radicals and improve the removal effect of organic matters in coking wastewater.
2) The three-dimensional electrochemical processing unit effectively relieves the electrode passivation in a pulse power supply mode, and the system operation stability is enhanced.
3) The three-dimensional electric biological treatment unit applies weak current, promotes microbial activity, and greatly reduces system energy consumption.
4) The three-dimensional electrochemical treatment unit and the three-dimensional electric biological treatment unit both adopt two-stage treatment processes, so that the condition of hydraulic short flow in a continuous flow operation mode is avoided, and the treatment effect is improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a diagram showing the effect of COD treatment on wastewater;
FIG. 3 is a diagram showing the effect of TN treatment on wastewater.
Detailed Description
Referring to the attached figure 1, the system consists of a three-dimensional electrochemical treatment unit I and a three-dimensional electric biological treatment unit II, and comprises a three-dimensional electrode reactor 5, a peristaltic pump 8, a pulse power supply 9, an intermediate water collecting tank 10 and a direct current power supply 12. The three-dimensional electrochemical processing unit I consists of two three-dimensional electrode reactors 5 connected in series and a composite activated carbon particle electrode 4 filled between the anode plate 1 and the cathode plate 2; peristaltic pumps 8 are arranged on the two pipelines connected in series; the three-dimensional electric biological treatment unit II consists of another two three-dimensional electrode reactors 5 connected in series and a biological film particle electrode 11 filled between the anode plate 1 and the cathode plate 2; the other two pipelines connected in series are provided with another peristaltic pump 8; a peristaltic pump 8 is arranged on a pipeline connecting the middle water collecting tank 10 and the three-dimensional electric biological treatment unit II; the composite active carbon particle electrode 4 is a catalyst loaded on the surface of the granular active carbon by adopting a dipping or calcining method according to the mass ratio of copper oxide, manganese dioxide and ferric oxide of 1:1: 1; the biomembrane particle electrode 11 is granular activated carbon inoculated with activated sludge, and the surface of the electrode is enriched with an electroactive biomembrane for degrading coking wastewater.
Each compartment of the three-dimensional electrode reactor 5 in the three-dimensional electrochemical treatment unit I comprises: the cathode plate 2, the anode plate 1, the composite activated carbon particle electrode 4 filled between the cathode plate and the anode plate, and the pulse power supply 9 for supplying power to the electrodes; the upper parts of the cathode chamber and the anode chamber of the three-dimensional electrode reactor 5 are provided with a water inlet 3 and a water outlet 7, and the lower parts of the cathode chamber and the anode chamber are provided with an aeration port 6.
Each compartment of the three-dimensional electrode reactor 5 in the three-dimensional electrobiological treatment unit II comprises: a cathode plate 2, an anode plate 1, a biomembrane particle electrode 11 filled between the cathode plate and the anode plate, and a direct current power supply 12 for supplying power to the electrodes; the upper parts of the cathode chamber and the anode chamber of the three-dimensional electrode reactor 5 are provided with a water inlet 3 and a water outlet 7, and the lower parts of the cathode chamber and the anode chamber are provided with an aeration port 6.
The present invention will be described in further detail below with respect to the treatment of coking wastewater.
Example 1
The invention adopts a continuous flow mode to operate a three-dimensional electrochemical coupling three-dimensional electric biological coking wastewater treatment system, coking wastewater taken from a regulating reservoir is filtered to remove suspended particulate matters, the coking wastewater is input into a first three-dimensional electrode reactor 5 of a three-dimensional electrochemical treatment unit I through a peristaltic pump 8, effluent enters a second three-dimensional electrode reactor 5, and composite activated carbon particle electrodes 4 filled in the two three-dimensional electrode reactors 5 can effectively promote the generation of active oxidation substances such as hydroxyl radicals and improve the degradation effect on organic matters. The wastewater treated by the three-dimensional electrochemical treatment unit I is discharged into an intermediate water collecting tank 10 through a water outlet 7, the wastewater in the intermediate water collecting tank 10 is input into a first three-dimensional electrode reactor 5 of a three-dimensional electric biological treatment unit II through a peristaltic pump 8, the effluent enters a second three-dimensional electrode reactor 5, a biofilm particle electrode 11 filled in the two three-dimensional electrode reactors 5 adopts granular activated carbon as a biofilm carrier to carry out biofilm formation, microorganisms are inoculated in activated sludge of a municipal sewage treatment plant, the coking wastewater passing through the three-dimensional electrochemical treatment unit I is used as a substrate, the three-dimensional electrode reactor 5 is acclimated for about 30 days, 120mA current provided by a direct current power supply 12 is used during the acclimation period to carry out metabolic activity of the microorganisms under the stimulation of weak current until a brown biofilm is observed on the surface of the granular activated carbon, so that pollutants are enhanced and degraded under the synergistic action of the microorganisms and electricity, the waste water is discharged out of the waste water treatment system through a water outlet 7.
The effective volume of the three-dimensional electrode reactor 5 in the embodiment is 1.5L, the filling amount of the particle electrode is 1000g, and the anode plate 1 and the cathode plate 2 which are used are both titanium-based ruthenium iridium oxide electrodes. The pulse voltage applied by the three-dimensional electrochemical treatment unit I is 8V, the direct current voltage applied by the three-dimensional electric biological treatment unit II is 3V, the hydraulic retention time of the system is 10h, and the aeration rate is 100L/h.
Referring to attached figures 2-3, the coking wastewater entering the first three-dimensional electrode reactor 5 in the three-dimensional electrochemical treatment unit I has a COD concentration of 642-856 mg/L and a total nitrogen concentration of 196-246 mg/L, most of refractory pollutants in the coking wastewater are removed by the three-dimensional electrochemical treatment unit I, then the coking wastewater is input into the three-dimensional electrobiological treatment unit II to further remove residual pollutants in the coking wastewater, and the average removal rates of the COD and the total nitrogen of the coking wastewater after the electrochemical and electrobiological secondary treatment are respectively 79.6% and 76.3%.
It is intended that all such modifications and variations be included herein within the scope of the present invention and protected by the following claims.
Claims (8)
1. A three-dimensional electrochemical coupling three-dimensional electric biological coking wastewater treatment system is characterized in that the coking wastewater treatment system consists of three-dimensional electric biological treatment units connected through an intermediate water collecting tank, wherein each three-dimensional electric biological treatment unit consists of two three-dimensional electrode reactors connected in series and a composite activated carbon particle electrode filled between an anode plate and a cathode plate; peristaltic pumps are arranged on the two pipelines connected in series; the three-dimensional electric biological treatment unit consists of another two three-dimensional electrode reactors connected in series and a biological film particle electrode filled between the anode plate and the cathode plate; the other two pipelines connected in series are provided with another peristaltic pump; a peristaltic pump is arranged on a pipeline connecting the middle water collecting tank and the three-dimensional electric biological treatment unit.
2. The three-dimensional electrochemical coupling three-dimensional electric biological coking wastewater treatment system according to claim 1, characterized in that the composite activated carbon particle electrode (4) is a catalyst which is loaded on the surface of granular activated carbon by a dipping or calcining method according to a mass ratio of copper oxide, manganese dioxide and ferric oxide of 1:1: 1.
3. The three-dimensional electrochemical coupling three-dimensional electric biological coking wastewater treatment system according to claim 1, characterized in that the biomembrane particle electrode is granular activated carbon inoculated with activated sludge, and the surface of the biomembrane particle electrode is enriched with an electric active biomembrane for degrading coking wastewater.
4. The three-dimensional electrochemical coupling three-dimensional electric biological coking wastewater treatment system according to claim 1, characterized in that the volume ratio of the filling of the activated carbon particle electrode and the biofilm particle electrode is 50-70%.
5. The three-dimensional electrochemical coupling three-dimensional electric biological coking wastewater treatment system of claim 1, which is characterized in that the upper parts of the cathode chamber and the anode chamber of the three-dimensional electrode reactor are provided with a water inlet and a water outlet, and the lower parts of the cathode chamber and the anode chamber are provided with an aeration port.
6. The three-dimensional electrochemical coupling three-dimensional electric biological coking wastewater treatment system according to claim 1, characterized in that the activated carbon particle electrode is regenerated once every 24-96 hours of operation, wherein the regeneration is to switch the wastewater entering the three-dimensional electrode reactor into tap water, perform electrolytic treatment for 15-60 minutes according to conventional operation conditions, discharge the wastewater after the regeneration is completed, and switch the water inlet of the three-dimensional electrode reactor into wastewater for electrochemical reaction.
7. The three-dimensional electrochemical coupling three-dimensional electric biological coking wastewater treatment system according to claim 1, characterized in that the three-dimensional electrochemical treatment unit and the three-dimensional electric biological treatment unit are respectively powered by a pulse power supply and a direct current power supply.
8. The three-dimensional electrochemical coupling three-dimensional electric biological coking wastewater treatment system according to claim 7, characterized in that the voltage of the pulse power supply is 8-20V, the duty ratio is 50-80%, and the frequency is 1000 Hz; the voltage of the direct current power supply is 3-10V.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111517428A (en) * | 2020-06-19 | 2020-08-11 | 中国石油化工股份有限公司 | Treatment process and system for removing heavy metal ions in PTA wastewater |
| CN112340816A (en) * | 2020-10-22 | 2021-02-09 | 中国石油化工股份有限公司 | Pretreatment method of polyether wastewater |
| CN114835243A (en) * | 2022-05-06 | 2022-08-02 | 济南大学 | Method for improving electron transfer efficiency of flora in situ |
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| CN115583718A (en) * | 2022-09-07 | 2023-01-10 | 齐鲁工业大学 | Bioelectrochemical reactor and method for treating wastewater by same |
| CN116903125A (en) * | 2023-06-06 | 2023-10-20 | 兰州交通大学 | Fusion type catalytic biomembrane filler and preparation method thereof |
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2020
- 2020-01-20 CN CN202010063422.9A patent/CN111253003A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111517428A (en) * | 2020-06-19 | 2020-08-11 | 中国石油化工股份有限公司 | Treatment process and system for removing heavy metal ions in PTA wastewater |
| CN112340816A (en) * | 2020-10-22 | 2021-02-09 | 中国石油化工股份有限公司 | Pretreatment method of polyether wastewater |
| WO2022199096A1 (en) * | 2021-03-26 | 2022-09-29 | 北京城市排水集团有限责任公司 | Electrochemical nitrogen and phosphorus removal device and method |
| CN114835243A (en) * | 2022-05-06 | 2022-08-02 | 济南大学 | Method for improving electron transfer efficiency of flora in situ |
| CN115583718A (en) * | 2022-09-07 | 2023-01-10 | 齐鲁工业大学 | Bioelectrochemical reactor and method for treating wastewater by same |
| CN115583718B (en) * | 2022-09-07 | 2023-12-29 | 齐鲁工业大学 | Bioelectrochemical reactor and method for treating wastewater by same |
| CN116903125A (en) * | 2023-06-06 | 2023-10-20 | 兰州交通大学 | Fusion type catalytic biomembrane filler and preparation method thereof |
| CN116903125B (en) * | 2023-06-06 | 2023-12-19 | 兰州交通大学 | Fusion type catalytic biomembrane filler and preparation method thereof |
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