CN209338334U - High-concentration organic wastewater treatment system with high salt based on photoelectricity Fenton-MBR - Google Patents
High-concentration organic wastewater treatment system with high salt based on photoelectricity Fenton-MBR Download PDFInfo
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Abstract
The disclosure discloses a kind of high-concentration organic wastewater treatment system with high salt based on photoelectricity Fenton-MBR, comprising: coagulative precipitation tank, the first pH conditioning tank, photoelectricity Fenton reactor, the 2nd pH conditioning tank, sedimentation basin, hydrolysis acidification pool and MBR reaction tank；Wherein, the output end of the coagulative precipitation tank is connected with the input terminal of the first pH conditioning tank；The output end of the first pH conditioning tank is connected with the input terminal of the photoelectricity Fenton reactor；The output end of the photoelectricity Fenton reactor is connected with the input terminal of the 2nd pH conditioning tank；The output end of the 2nd pH conditioning tank is connected with the input terminal of the sedimentation basin；The output end of the sedimentation basin is connected with the input terminal of the hydrolysis acidification pool；The output end of the hydrolysis acidification pool is connected with the input terminal of the MBR reaction tank.Content of organics and COD in high concentrated organic wastewater with high salt can be effectively reduced in the disclosureCrValue.
Description
Technical Field
The utility model belongs to the technical field of industrial wastewater treatment, concretely relates to high salt high concentration organic wastewater treatment system based on photoelectricity Fenton-MBR.
Background
In recent years, with the rapid development of industries such as petroleum, pesticide and dye, the types and the amount of refractory organic pollutants in wastewater are increased, and the harm caused by the refractory organic pollutants is more serious, so that the refractory organic pollutants become a focus of increasing attention of countries and experts. At present, the treatment of pharmaceutical wastewater with high salt and high organic content under the condition of 25000mg/L mainly adopts a biological method, but after the high-salt and high-concentration organic pharmaceutical wastewater is treated by the biological method, the Chemical Oxygen Demand (COD) of effluent water is difficult to reach the standard, and the high-salt and high-concentration organic pharmaceutical wastewater contains water-soluble humus which is difficult to biodegrade, and needs a physicochemical method for advanced treatment. The electrochemical advanced oxidation technology is used as a novel environmental pollutant reduction technology, and has a good treatment effect on refractory pharmaceutical wastewater.
The photoelectric Fenton oxidation method is characterized in that an ultraviolet lamp is introduced into an electric Fenton reactor, and under the action of ultraviolet light, the electric Fenton reaction leads organic matters to be efficiently degraded due to the synergistic effect of the photo-reduction of iron ions and the light radiation decomposition of hydrogen peroxide. Compared with electro-Fenton, the electro-Fenton has the outstanding advantages that the introduction of ultraviolet light can induce the generation of a large amount of OH, the current utilization efficiency is improved, and therefore, the treatment effect is better than that of an electro-Fenton oxidation method.
As a novel efficient sewage treatment and recycling process, a Membrane Bioreactor (MBR) combines the advantages of modern membrane separation technology and biological treatment technology, utilizes the selective permeability of a biological membrane, and replaces a secondary clarification tank of the traditional activated sludge method.
How to combine the photoelectric Fenton and the MBR to exert the respective advantages becomes the research direction of the present disclosure.
SUMMERY OF THE UTILITY MODEL
To solve the problems, the present disclosure provides a high-salt high-concentration organic wastewater treatment system based on a photoelectric fenton-MBR, which can degrade most organic substances through a photoelectric fenton reactor, and can realize solid-liquid separation of wastewater through an MBR membrane reaction assembly.
To achieve the above object, the technical solution of the present disclosure is described as follows:
a high-salinity high-concentration organic wastewater treatment system based on photoelectric Fenton-MBR comprises: the device comprises a coagulating sedimentation tank, a first pH adjusting tank, a photoelectric Fenton reactor, a second pH adjusting tank, a sedimentation tank, a hydrolysis acidification tank and an MBR (membrane bioreactor) reaction tank; wherein,
the output end of the coagulating sedimentation tank is connected with the input end of the first pH adjusting tank;
the output end of the first pH adjusting tank is connected with the input end of the photoelectric Fenton reactor;
the output end of the photoelectric Fenton reactor is connected with the input end of the second pH adjusting tank;
the output end of the second pH adjusting tank is connected with the input end of the sedimentation tank;
the output end of the sedimentation tank is connected with the input end of the hydrolysis acidification tank;
and the output end of the hydrolysis acidification tank is connected with the input end of the MBR reaction tank.
Preferably, the coagulating sedimentation tank is used for coagulating sedimentation of the high-salt high-concentration organic wastewater by adding polyaluminium chloride and polyacrylamide, wherein the content of the polyaluminium chloride is 30-120mg/L, and the content of the polyacrylamide is 0.2-5 mg/L.
Preferably, the pH value of the high-salt high-concentration organic wastewater is adjusted to 2-6 in the first pH adjusting tank by adding strong acid.
Preferably, the strong acid comprises any one of: sulfuric acid, nitric acid, hydrochloric acid, perchloric acid, permanganic acid, hydroiodic acid, hydrobromic acid.
Preferably, the cathode of the main electrode of the photoelectric Fenton reactor is a porous tube carbonaceous electrode, and the anode is a titanium-based DSA electrode.
Preferably, the titanium-based DSA electrode comprises any one of:
Ti/TiO2-IrO2-RuO2、Ti/TiO2-IrO2-RuO2-SnO2、Ti/TiO2-Ta2O5-IrO2、Ti/TiO2-Ta2O5-IrO2-SnO2。
preferably, the pH value of the high-salt high-concentration organic wastewater is adjusted to 7-8 in the second pH adjusting tank by adding strong alkali.
Preferably, the strong base comprises any one of: sodium hydroxide, potassium hydroxide, calcium hydroxide, barium hydroxide.
Preferably, an immersed membrane bioreactor is arranged in the MBR reaction tank and is used for intercepting activated sludge and macromolecular organic matters in wastewater.
Preferably, the submerged membrane bioreactor is filled with a hollow fiber membrane module or a plate-type membrane.
Compared with the prior art, the beneficial effect of this disclosure is:
1. after the high-salt high-concentration organic wastewater is subjected to the action of the photoelectric Fenton reactor, organic matters in the high-salt high-concentration organic wastewater are oxidized into inorganic matters, so that the effect of effectively degrading the organic matters can be achieved, and the defects of low efficiency of the traditional optical Fenton quantum and the regeneration problem of an electro-Fenton catalyst can be overcome;
2. by utilizing the interception function of the membrane component, microorganisms with longer generation period like nitrobacteria can be enriched, so that the positive promotion effect on the removal of ammonia nitrogen is exerted, the effluent quality is good, and the output of residual sludge is low;
3. the high-salt high-concentration organic wastewater treated by the method can effectively reduce CODCrThe treatment can meet the requirement of first-level A emission, and the method has the advantages of low treatment cost, simple operation, easy control and the like.
Drawings
Fig. 1 is a schematic structural diagram of a high-salt high-concentration organic wastewater treatment system based on photoelectric fenton-MBR according to the present disclosure.
Detailed Description
In order to make the technical solutions and advantages of the present disclosure clearer and clearer, the present disclosure is further described below with reference to the accompanying drawings and examples.
Referring to fig. 1, a high-salt and high-concentration organic wastewater treatment system based on a photoelectric fenton-MBR comprises a coagulation sedimentation tank, a first pH adjusting tank, a photoelectric fenton reactor, a second pH adjusting tank, a sedimentation tank, a hydrolysis acidification tank and an MBR reaction tank; wherein,
the output end of the coagulating sedimentation tank is connected with the input end of the first pH adjusting tank;
the output end of the first pH adjusting tank is connected with the input end of the photoelectric Fenton reactor;
the output end of the photoelectric Fenton reactor is connected with the input end of the second pH adjusting tank;
the output end of the second pH adjusting tank is connected with the input end of the sedimentation tank;
the output end of the sedimentation tank is connected with the input end of the hydrolysis acidification tank;
and the output end of the hydrolysis acidification tank is connected with the input end of the MBR reaction tank.
The embodiment completely reflects the technical scheme of the disclosure, and the embodiment has the advantages of degrading most organic matters through the photoelectric Fenton reactor, and can overcome the problems of low efficiency of the traditional optical Fenton quantum and regeneration of the electro-Fenton catalyst; by the interception function of the MBR membrane component, the ammonia nitrogen in the wastewater can be effectively removed, and the device has the advantages of good effluent quality and small sludge yield.
Specifically, the implementation process of this embodiment is as follows: after high-salt high-concentration organic wastewater enters a coagulating sedimentation tank, adding polyaluminium chloride and polyacrylamide to generate floc, fully precipitating, and after staying for 1.5-2 hours, discharging supernatant in the wastewater into a first pH adjusting tank; strong acid is added into the first pH adjusting tank, the pH value of the wastewater can be adjusted to 2-6, and the wastewater adjusted by the first pH adjusting tank enters a photoelectric Fenton reactor; the photoelectric Fenton reactor can oxidize organic matters in the wastewater into inorganic matters, so that the purpose of degradation is achieved; strong base is added into the second pH adjusting tank, so that the pH value of the acidic wastewater can be adjusted to 7-8; the wastewater adjusted by the second pH adjusting tank stays in the hydrolysis acidification tank for 3-5 hours, and the difficultly degraded macromolecules in the wastewater are converted into micromolecules, so that the biodegradability is improved; the wastewater after hydrolytic acidification enters an MBR reaction tank, a membrane biological component in the MBR reaction tank has a high-efficiency interception effect, all bacteria and suspended matters can be intercepted in an aeration tank in a reactor, the microbial concentration is improved, the retention time of organic solids is prolonged, and therefore the purpose of continuously biologically reducing pollutants in the wastewater can be achieved.
In another embodiment, the coagulating sedimentation tank is used for coagulating sedimentation of the high-salt high-concentration organic wastewater by adding polyaluminium chloride and polyacrylamide, wherein the content of the polyaluminium chloride is 30-120mg/L, and the content of the polyacrylamide is 0.2-5 mg/L.
In the embodiment, the polyaluminium chloride has the performances of adsorption, condensation, precipitation and the like, can improve the polymerization degree and the alkalinity by acting with alkali in the wastewater, can finally form aluminum hydroxide precipitate or aluminate, and is easy to generate precipitate when being mixed with aluminum sulfate or other multivalent acid salts. The polyacrylamide is a high-molecular water treatment flocculant product, can adsorb suspended particles in water, plays a role in bridging among the particles, enables fine particles to form larger floccules, and has the effect of accelerating the speed of precipitation.
In another embodiment, the pH value of the high-salt high-concentration organic wastewater is adjusted to 2-6 in the first pH adjusting tank by adding strong acid.
In another embodiment, the strong acid comprises any one of: sulfuric acid, nitric acid, hydrochloric acid, perchloric acid, permanganic acid, hydroiodic acid, hydrobromic acid.
In another embodiment, the cathode of the main electrode of the photoelectric Fenton reactor is a porous tube carbonaceous electrode, and the anode is a titanium-based DSA electrode.
In this embodiment, the titanium-based DSA electrode is also referred to as a metal oxide electrode/dimensionally stable electrode, and is formed by coating a titanium metal as a substrate with rare metals such as tin, antimony, ruthenium, manganese, cobalt, iridium, and the like on the surface. The metal oxide is doped in the titanium-based DSA electrode, so that the oxygen evolution potential and the catalytic performance can be improved.
In another embodiment, the titanium-based DSA electrode comprises any one of: Ti/TiO 22-IrO2-RuO2、Ti/TiO2-IrO2-RuO2-SnO2、Ti/TiO2-Ta2O5-IrO2、Ti/TiO2-Ta2O5-IrO2-SnO2。
In another embodiment, the pH value of the high-salt high-concentration organic wastewater is adjusted to 7-8 in the second pH adjusting tank by adding strong alkali.
In another embodiment, the strong base comprises any one of: sodium hydroxide, potassium hydroxide, calcium hydroxide, barium hydroxide.
In the embodiment, strong alkali is added into the wastewater, so that the wastewater can be adjusted from acidity to neutrality, and the advantages of avoiding corrosion of a drainage pipeline and environmental damage are achieved.
In another embodiment, the MBR reaction tank is provided with an immersed membrane bioreactor for intercepting activated sludge and macromolecular organic matters in wastewater.
In this embodiment, MBR membrane bioreactor subassembly can hold back activated sludge and the macromolecule organic matter of inslot, keeps high activated sludge concentration, improves biological treatment organic load, can realize the deep purification to waste water, reduces waste water treatment facility area to reduce the excess sludge volume through keeping low mud load.
In another embodiment, the submerged membrane bioreactor is filled with hollow fiber membrane modules or plate membrane modules.
In the embodiment, the hollow fiber membrane component is an asymmetric self-supporting filter membrane, can be backwashed, and can ensure that the cross-flow filtration mode obtains the maximum benefit. The plate-type membrane component can adjust the treatment capacity within a certain allowable range by increasing or decreasing the membrane plates and the membranes, has simple structure, high reliability on pressure change and field operation, easy operation, detachable membrane plate and membrane cleaning after blockage and easy membrane replacement and maintenance.
In the following, the technical effects of the present disclosure were verified by comparing the data of the high-salt high-concentration organic wastewater before and after treatment.
Before treatment, the water quality indexes of the high-salt high-concentration organic wastewater are as follows:
CODCr: 1289 mg/L; ammonia nitrogen: 231mg/L, color 1300 times.
After being treated by the coagulating sedimentation tank, the effluent water quality indexes are as follows:
CODCr: 835 mg/L; ammonia nitrogen: 138mg/L and 210 times of chroma.
After the treatment of the photoelectric Fenton reactor, the water quality indexes are as follows:
CODCr: 167 mg/L; ammonia nitrogen: 35mg/L and 34 times of chroma.
After passing through the hydrolytic acidification treatment tank, the water quality indexes are as follows:
CODCr: 108 mg/L; ammonia nitrogen: 24mg/L, 16 times chroma.
After being treated by the MBR reaction tank, the water quality indexes are as follows:
CODCr: 34 mg/L; ammonia nitrogen: 5mg/L, colorDegree 4 times.
From the above data, it can be seen that the COD of the effluent after the high-salt high-concentration organic wastewater is treated by the method disclosed by the inventionCrThe chroma and ammonia nitrogen are all obviously reduced.
The above embodiments are merely preferred embodiments of the present disclosure, which is not intended to limit the present disclosure, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.
Claims (10)
1. A high-salinity high-concentration organic wastewater treatment system based on photoelectric Fenton-MBR comprises: the device comprises a coagulating sedimentation tank, a first pH adjusting tank, a photoelectric Fenton reactor, a second pH adjusting tank, a sedimentation tank, a hydrolysis acidification tank and an MBR (membrane bioreactor) reaction tank; wherein,
the output end of the coagulating sedimentation tank is connected with the input end of the first pH adjusting tank;
the output end of the first pH adjusting tank is connected with the input end of the photoelectric Fenton reactor;
the output end of the photoelectric Fenton reactor is connected with the input end of the second pH adjusting tank;
the output end of the second pH adjusting tank is connected with the input end of the sedimentation tank;
the output end of the sedimentation tank is connected with the input end of the hydrolysis acidification tank;
and the output end of the hydrolysis acidification tank is connected with the input end of the MBR reaction tank.
2. The system of claim 1, wherein the coagulating sedimentation tank is used for coagulating sedimentation of the high-salinity high-concentration organic wastewater by adding polyaluminium chloride and polyacrylamide, wherein the content of the polyaluminium chloride is 30-120mg/L, and the content of the polyacrylamide is 0.2-5 mg/L.
3. The system of claim 1, wherein the first pH adjustment tank adjusts the pH of the high-salt high-concentration organic wastewater to 2-6 by adding a strong acid.
4. The system of claim 3, wherein the strong acid comprises any one of: sulfuric acid, nitric acid, hydrochloric acid, perchloric acid, permanganic acid, hydroiodic acid, hydrobromic acid.
5. The system of claim 1, wherein the cathode of the main electrode of the photo-Fenton reactor is a porous tube carbonaceous electrode and the anode is a titanium-based DSA electrode.
6. The system of claim 5, wherein the titanium-based DSA electrode comprises any of: Ti/TiO 22-IrO2-RuO2、Ti/TiO2-IrO2-RuO2-SnO2、Ti/TiO2-Ta2O5-IrO2、Ti/TiO2-Ta2O5-IrO2-SnO2。
7. The system of claim 1, wherein the pH of the high-salt high-concentration organic wastewater is adjusted to 7-8 in the second pH adjustment tank by adding a strong base.
8. The system of claim 7, wherein the strong base comprises any one of: sodium hydroxide, potassium hydroxide, calcium hydroxide, barium hydroxide.
9. The system of claim 1, wherein the MBR reaction tank is provided with a submerged membrane bioreactor for intercepting activated sludge and macromolecular organic matters in the wastewater.
10. The system of claim 9, wherein the submerged membrane bioreactor is filled with a hollow fiber membrane module or a plate membrane.
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| CN111646634A (en) * | 2020-05-11 | 2020-09-11 | 南京岱蒙特科技有限公司 | Ultrasonic coupling photoelectric Fenton activated persulfate water treatment system and water treatment method |
| CN115159791A (en) * | 2022-08-10 | 2022-10-11 | 中电环保股份有限公司 | Landfill leachate treatment system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111646634A (en) * | 2020-05-11 | 2020-09-11 | 南京岱蒙特科技有限公司 | Ultrasonic coupling photoelectric Fenton activated persulfate water treatment system and water treatment method |
| CN115159791A (en) * | 2022-08-10 | 2022-10-11 | 中电环保股份有限公司 | Landfill leachate treatment system |
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