CN211198890U - Industrial wastewater treatment system - Google Patents
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- CN211198890U CN211198890U CN201921781308.9U CN201921781308U CN211198890U CN 211198890 U CN211198890 U CN 211198890U CN 201921781308 U CN201921781308 U CN 201921781308U CN 211198890 U CN211198890 U CN 211198890U
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Abstract
The utility model discloses a processing system of industrial waste water. The treatment system comprises an adsorption tank, an MCR tank, an electrolytic reaction tank and a precipitation tank; wherein the adsorption tank is provided with a water inlet, an activated carbon inlet and a water outlet; the MCR tank is provided with a water inlet, a water outlet, an immersed ultrafiltration membrane component and a return pipeline; the electrolytic reaction tank is provided with a water inlet and a water outlet; the sedimentation tank is provided with a water inlet, a supernatant outlet and an active carbon outlet; the water outlet of the adsorption tank is connected with the water inlet of the MCR tank; a return pipeline of the MCR tank is connected with a water inlet of the electrolytic reaction tank; the water outlet of the electrolytic reaction tank is connected with the water inlet of the precipitation tank; the active carbon outlet of the precipitation tank is connected with the active carbon inlet of the adsorption tank. The system is used for treating the degradation-resistant industrial wastewater, the comprehensive efficiency of the powdered activated carbon electrolysis regeneration is high, the pollutants in the degradation-resistant wastewater can be efficiently removed, the effluent of a sewage plant can be guaranteed to reach the standard, the running cost is more economic, and the system has a good application prospect.
Description
Technical Field
The utility model belongs to the technical field of industrial waste water treatment, concretely relates to industrial waste water's processing system.
Background
The sewage discharged from industrial parks generally has the characteristics of complex water quality, high salt content, high content of non-biodegradable COD (chemical oxygen demand), high chroma and the like, and the independent biochemical treatment of the industrial wastewater is difficult to reach increasingly strict discharge standards of COD, ammonia nitrogen, total nitrogen, chroma and the like, so that the sewage treatment plants of most industrial parks often adopt a pretreatment + biochemical + advanced oxidation treatment process. The advanced oxidation process is commonly used at the back end of biochemical effluent and is used for further oxidizing and removing pollutants which cannot be biochemically degraded in wastewater. Common advanced oxidation processes are fenton, ozone, electrochemical oxidation, and the like.
The advanced oxidation technology mainly removes pollutants by oxidizing and degrading pollutant molecules into micromolecular organic matters and mineralizing the micromolecular organic matters into carbon dioxide, water and the like to realize removal of indexes such as COD (chemical oxygen demand), chromaticity and the like, wherein the Fenton has strong oxidation capacity, but the Fenton removal effect is limited for a plurality of heterocyclic macromolecular organic pollutants and macromolecular organic pollutants, the Fenton removal effect is not increased along with the increase of a Fenton reagent, the biochemical property of the organic macromolecules after Fenton oxidation is still poor, and if the COD content in the wastewater is more than 100 mg/L, the application of the Fenton technology can cause that the effluent can not reach the standard stably and the application is limited.
Ozone advanced oxidation is commonly used for removing chroma in wastewater and removing a small amount of COD (chemical oxygen demand), for example, COD of biochemical effluent is slightly higher than a discharge standard, an ozone process can be selected, the chroma removal and the COD standard reaching are ensured at the same time, but when the COD of the biochemical effluent is higher than the discharge standard by more than 50 mg/L, the removal effect, investment and operation cost of the ozone process are all deteriorated.
The advanced treatment process of the industrial wastewater adopts an activated carbon adsorption process, the treatment effect of the powdered activated carbon adsorption process is influenced by the concentration of the added powdered activated carbon, and the added powdered activated carbon is also influenced by the COD concentration of the advanced treatment inlet water. When the COD concentration is high, the treatment cost of the powdered activated carbon is higher, and the powdered activated carbon with saturated adsorption is dangerous waste, so that the treatment cost per ton of water is higher. The regeneration cost of the granular activated carbon bed after saturated adsorption is also high, and the regeneration effect is difficult to ensure.
At present, further improvement and improvement are still needed for advanced treatment of industrial wastewater, especially for advanced treatment of refractory industrial wastewater.
SUMMERY OF THE UTILITY MODEL
In order to overcome the problem that prior art difficult degradation industrial waste water treatment exists, the utility model aims to provide an industrial waste water's processing system, this processing system can be used for difficult degradation industrial waste water's advanced treatment.
The utility model provides a system for treating industrial wastewater by combining MCR (Membrane chemical reactor) and electrochemical oxidation.
In order to achieve the purpose, the technical scheme adopted by the utility model is as follows:
a treatment system of industrial wastewater comprises an adsorption tank, an MCR tank, an electrolytic reaction tank and a precipitation tank; wherein the adsorption tank is provided with a water inlet, an activated carbon inlet and a water outlet; the MCR tank is provided with a water inlet, a water outlet, an immersed ultrafiltration membrane component and a return pipeline; the electrolytic reaction tank is provided with a water inlet and a water outlet; the sedimentation tank is provided with a water inlet, a supernatant outlet and an active carbon outlet; the water outlet of the adsorption tank is connected with the water inlet of the MCR tank; a return pipeline of the MCR tank is connected with a water inlet of the electrolytic reaction tank; the water outlet of the electrolytic reaction tank is connected with the water inlet of the precipitation tank; the active carbon outlet of the precipitation tank is connected with the active carbon inlet of the adsorption tank.
In the industrial wastewater treatment system, the adsorption tank is used for receiving industrial wastewater and performing powdered activated carbon adsorption treatment on the industrial wastewater; the MCR pool is used for receiving the effluent of the adsorption pool and performing adsorption and filtration treatment on the effluent of the adsorption pool; the electrolysis reaction tank is used for receiving the powdered activated carbon mixed solution (powdered activated carbon and wastewater mixed solution) of the MCR tank and carrying out electrolysis regeneration treatment on the powdered activated carbon mixed solution; the settling tank is used for receiving the effluent of the electrolytic reaction tank and settling the effluent of the electrolytic reaction tank.
In the industrial wastewater treatment system, the adsorption tank receives refractory industrial wastewater, the refractory industrial wastewater is effluent after biochemical treatment of the industrial wastewater, the biochemical treatment comprises an A2O process, an SBR process, a multi-section AO process, an A2O + MBR process and the like, COD of effluent after the biochemical treatment processes is basically non-biodegradable COD, SS (concentration of suspended solids) is less than 10 mg/L, and the non-biodegradable COD is 50 mg/L-250 mg/L.
Preferably, in the industrial wastewater treatment system, the refractory industrial wastewater received by the adsorption tank is secondary sedimentation tank effluent or MBR (membrane bioreactor) tank effluent of the industrial wastewater. That is, in the treatment system, the adsorption tank receives the effluent of the secondary sedimentation tank or the effluent of the MBR tank of the industrial wastewater, and the water inlet of the adsorption tank can be connected with the water outlet of the secondary sedimentation tank or the water outlet of the MBR tank.
Preferably, in the industrial wastewater treatment system, a mechanical stirring device is arranged in the adsorption tank; further preferably, a frame type stirring device is arranged in the adsorption tank.
In the industrial wastewater treatment system, the effluent of the adsorption tank automatically flows into the MCR tank.
Preferably, in the industrial wastewater treatment system, the immersed ultrafiltration membrane component of the MCR tank is also respectively connected with the aeration device, the water production pump and the backwashing system. And the wastewater treated by the adsorption tank is subjected to further adsorption reaction in the MCR tank, filtered by an ultrafiltration membrane component, and discharged after being inspected to reach the standard.
Preferably, in the industrial wastewater treatment system, the return pipeline of the MCR tank is connected with the water inlet of the electrolytic reaction tank through a water suction pump. And part of the powdered activated carbon mixed solution in the MCR tank flows back to the electrolytic reaction tank through a return pipeline for treatment, and the powdered activated carbon mixed solution flows back to the electrolytic reaction tank by pumping.
Preferably, in the industrial wastewater treatment system, the electrolytic reaction tank is provided with a cathode plate and an anode plate.
Preferably, in the industrial wastewater treatment system, the distance between the cathode plate and the anode plate in the electrolytic reaction tank is 2 cm-15 cm.
Preferably, in the electrolytic reaction cell, the cathode plate is selected from a titanium plate or a stainless steel plate, the stainless steel plate is selected from a 316L stainless steel plate, and the anode plate is selected from a coated titanium plate or a titanium plate.
Preferably, in the industrial wastewater treatment system, the cell voltage of the electrolytic reaction cell is 3V-15V.
Preferably, in the industrial wastewater treatment system, the current density of the electrolytic reaction cell is 50A/m2～300A/m2。
In the industrial wastewater treatment system, effluent treated by the electrolytic reaction tank automatically flows into the precipitation tank.
Preferably, in the industrial wastewater treatment system, the activated carbon outlet of the precipitation tank is arranged at the bottom of the precipitation tank.
Preferably, in the industrial wastewater treatment system, the adsorption tank, the MCR tank, the electrolytic reaction tank and the precipitation tank device units can be independently arranged and then connected through pipelines, and can also be combined through combined design on the premise of ensuring the process functions of all the units. For example, the adsorption tank can be designed by combining with an MCR tank, and the adsorption tank can be combined with the MCR tank by using an MCR water distribution channel design; the precipitation tank may also be combined with an electrolytic reaction cell.
The utility model has the advantages that:
use the utility model discloses a system treatment refractory industrial waste water, powder activated carbon electrolysis regeneration comprehensive efficiency is high, can high-efficiently get rid of the pollutant in the refractory waste water, can guarantee that the effluent of sewage factory is up to standard, and the running cost is more economical, has good application prospect.
Drawings
Figure 1 is a schematic diagram of a treatment system of the present invention.
Detailed Description
Figure 1 is a schematic diagram of the treatment system of the present invention. In FIG. 1, 1-adsorption cell; 2-MCR pool; 3-an electrolytic reaction cell; 4-a precipitation tank; 11-a water inlet of the adsorption tank; 12-a mechanical stirring device; 13-an active carbon inlet; 14-water outlet of the adsorption tank; 21-MCR pool water inlet; 22-an immersed ultrafiltration membrane module; 23-a return line; 24-MCR pool water outlet; 25-a water pump; 31-electrolytic cell water inlet; 32-a cathode plate; 33-an anode plate; 34-an electrolytic cell water outlet; 41-water inlet of the precipitation tank; 42-supernatant outlet; 43-active carbon outlet. The drawings are only for the purpose of illustrating the invention and are not to be construed as limiting the invention; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The treatment system of the present invention is further described below with reference to fig. 1.
A treatment system of industrial wastewater comprises an adsorption tank 1, an MCR tank 2, an electrolytic reaction tank 3 and a precipitation tank 4. The adsorption tank 1 is provided with a water inlet 11, an activated carbon inlet 13 and a water outlet 14; the MCR pool 2 is provided with a water inlet 21, a water outlet 24, an immersed ultrafiltration membrane assembly 22 and a return pipeline 23. The electrolytic reaction tank 3 is provided with a water inlet 31 and a water outlet 34. The precipitation tank 4 is provided with a water inlet 41, a supernatant outlet 42 and an activated carbon outlet 43.
The water outlet 14 of the adsorption tank is connected with the water inlet 21 of the MCR tank. A mechanical stirring device 12 is arranged in the adsorption tank 1.
The return pipeline 23 of the MCR pool is connected with the water inlet 31 of the electrolytic reaction pool, in particular, the return pipeline 23 of the MCR pool is connected with the water inlet 31 of the electrolytic reaction pool through a water suction pump 25. The water outlet 34 of the electrolytic reaction cell is connected with the water inlet 41 of the precipitation tank.
The electrolytic reaction cell 3 is provided with a cathode plate 32 and an anode plate 33. The distance between the cathode plate 32 and the anode plate 33 is 2 cm-15 cm.
The activated carbon outlet 43 of the precipitation tank is arranged at the bottom of the precipitation tank 4. The active carbon outlet 43 of the precipitation tank is connected with the active carbon inlet 13 of the adsorption tank.
The adsorption tank in the present treatment system is further described as follows:
the adsorption tank is used for receiving the industrial wastewater difficult to degrade and carrying out powdered activated carbon adsorption treatment on the industrial wastewater difficult to degrade.
The adsorption tank 1 is provided with a water inlet 11, a mechanical stirring device 12, an activated carbon inlet 13 and a water outlet 14.
The water inlet 11 of the adsorption tank is used for receiving the industrial wastewater difficult to degrade, the industrial wastewater difficult to degrade is the effluent of the industrial wastewater after biochemical treatment, and the COD of the effluent after the biochemical treatment is basically non-biodegradable COD. The refractory industrial wastewater can be from the effluent of a secondary sedimentation tank or an MBR tank which is industrial wastewater. The water inlet 11 can be connected with the water outlet of the secondary sedimentation tank or the water outlet of the MBR tank.
A mechanical stirring device 12 is arranged in the adsorption tank, and the mechanical stirring device can be a frame type stirring device.
The activated carbon inlet 13 of the adsorption tank is used for receiving powdered activated carbon and can receive regenerated powdered activated carbon refluxed by the precipitation tank.
The water outlet 14 of the adsorption tank is connected with the water inlet 21 of the MCR tank, and the effluent of the adsorption tank automatically flows into the MCR tank.
The MCR cell in the present treatment system is further described as follows:
and the MCR tank is used for receiving the effluent of the adsorption tank and performing adsorption and filtration treatment on the effluent of the adsorption tank.
The water inlet 21 of the MCR tank is used for receiving the effluent of the adsorption tank.
An immersed ultrafiltration membrane assembly 22 is arranged in the MCR tank. The immersed ultrafiltration membrane component is also matched with an aeration device, a water production pump and a backwashing system. And the wastewater treated by the adsorption tank is subjected to further adsorption reaction in the MCR tank, filtered by an ultrafiltration membrane component, and discharged after being inspected to reach the standard. The organic pollutants are adsorbed in the powdered activated carbon and are trapped in the MCR pool by the ultrafiltration membrane component.
And a return pipeline 23 is also arranged in the MCR tank, and the return pipeline 23 is connected with a water inlet 31 of the electrolytic reaction tank through a water suction pump 25. And part of the powdered activated carbon mixed solution in the MCR tank flows back to the electrolytic reaction tank through a return line for treatment, and the return mode is pumping.
The wastewater treated by the MCR tank is discharged through a water outlet 24 after reaching the standard through detection.
The electrolytic reaction cell in the present treatment system is further described as follows:
the electrolytic reaction tank is used for receiving the powdered activated carbon mixed solution in the MCR tank and carrying out electrolytic regeneration treatment on the powdered activated carbon mixed solution.
The water inlet 31 of the electrolytic reaction tank is used for receiving the powder activated carbon mixed liquid of the MCR tank. In an electrolytic reaction tank, the mixed liquid of the powdered activated carbon is regenerated under the action of an electric field, and pollutants adsorbed by the powdered activated carbon are resolved and subjected to electrochemical reaction to be degraded; the regeneration process of the electrolytic reaction tank is also a high-grade oxidation process, and the method is remarkably characterized in that organic pollutants are oxidized and degraded into micromolecular organic matters or carbon dioxide, the biodegradability of treated effluent is improved, and the pollutants can be further biochemically reduced.
The electrolytic reaction tank is provided with a cathode plate 32 and an anode plate 33, wherein the cathode plate and the anode plate are both anti-corrosion plates, the cathode plate can be a titanium plate or a 316L stainless steel plate, the anode plate can be a coating titanium plate or a titanium plate, and the distance between the cathode plate and the anode plate is 2 cm-15 cm.
The electrolytic reaction cell is set up as a side-stream process. The regeneration of the powdered activated carbon is carried out in a side stream, and the effluent quality of a main stream process (MCR water production) is not influenced. And the side flow process is configured by the powdered activated carbon mixed liquid with different concentrations, so that the electrochemical regeneration investment and the operation cost can be reduced.
The water outlet 34 of the electrolytic reaction tank is used for discharging the powdered activated carbon mixed solution after the electrolytic regeneration treatment. The water outlet 34 of the electrolytic reaction cell is connected with the water inlet 41 of the precipitation tank. The mixed liquid of the regenerated powdered activated carbon treated by the electrolytic reaction tank automatically flows into a precipitation tank.
The settling tank in the treatment system is further described as follows:
the settling tank is used for receiving the effluent of the electrolytic reaction tank and settling the effluent of the electrolytic reaction tank.
The water inlet 41 of the settling tank is used for receiving the outlet water of the powdered activated carbon mixed liquid of the electrolytic reaction tank. And settling the effluent of the powdered activated carbon mixed solution in the electrolytic reaction tank in a settling tank.
The supernatant from the settling tank, which contains a high level of contaminants, is discharged through the supernatant outlet 42 and may be returned to the water inlet side of a sewage treatment plant for treatment or may be separately subjected to a biochemical process.
The bottom of the precipitation tank is provided with an activated carbon outlet 43. The activated carbon outlet 43 is connected with the activated carbon inlet 13 of the adsorption tank. The high-concentration regenerated powdered activated carbon at the bottom of the settling tank is discharged through an activated carbon outlet 43 and flows back to the adsorption tank for recycling.
In practical application, the adsorption tank, the MCR tank, the electrolytic reaction tank and the precipitation tank device unit of the treatment system can be independently arranged and then connected through pipelines, and can also be combined through combined design on the premise of ensuring the process functions of all the units. For example, the adsorption tank can be designed by combining with an MCR tank, and the adsorption tank can be combined with the MCR tank by using an MCR water distribution channel design; the precipitation tank may also be combined with an electrolytic reaction cell.
The method for treating the refractory industrial wastewater by using the system comprises the following steps: feeding the industrial wastewater difficult to degrade into an adsorption tank to perform powdered activated carbon adsorption reaction; after the reaction, the wastewater enters an MCR pool for further adsorption reaction, and the wastewater is filtered by an MCR membrane module and then is discharged after reaching the standard; part of the powdered activated carbon mixed liquid in the MCR tank flows back to the electrolytic reaction tank for electrolytic regeneration, and degrades compounds difficult to degrade, the powdered activated carbon mixed liquid regenerated by the electrolytic reaction tank automatically flows into the precipitation tank, the supernatant of the precipitation tank is discharged to the water inlet end of a sewage treatment plant or is subjected to biochemical process treatment independently, and the activated carbon regenerated at high concentration at the bottom of the precipitation tank flows back to the adsorption tank for next adsorption cycle reaction.
In the adsorption tank, the concentration of the powdered activated carbon is 500 mg/L-2000 mg/L, and the hydraulic retention time of the refractory industrial wastewater in the adsorption tank is 10-20 min.
In the MCR pool, the concentration of the powdered activated carbon is 2000 mg/L-6000 mg/L, the powdered activated carbon mixed solution in the MCR pool flows back into the electrolytic reaction pool according to the proportion of 10-50% of the water inflow rate, and the reflux proportion of the mixed solution is calculated by the adsorption balance of the powdered activated carbon.
In the electrolytic reaction tank, the voltage of the tank is 3V-15V; the current density is 50A/m2～300A/m2(ii) a The retention time of the mixed liquid of the powdered activated carbon in the electrolytic reaction tank is 10 min-60 min.
In the precipitation tank, the reflux proportion of the regenerated powdered activated carbon is 20-40% of the inflow rate of the precipitation tank. Namely, the regenerated powdered activated carbon with the flow rate of 20-40 percent flows back to the adsorption tank, and the rest supernatant can be returned to the biochemical process section for treatment. The water inlet flow rates are calculated by volume.
The qualified standard of the wastewater effluent of the MCR pool can reach the first-class A discharge standard (GB18918-2002) according to different requirements of the storage water body, and the COD requirement of the MCR pool is less than or equal to 50 mg/L, or reach the four-class standard of the surface water environmental quality standard, and the COD requirement of the MCR pool is less than or equal to 30 mg/L.
The present invention will be described in further detail with reference to specific examples. The starting materials used in the examples are, unless otherwise specified, commercially available from conventional sources. The apparatus/equipment used in the examples are commercially available in a conventional manner unless otherwise specified. References to connected/connected in the examples refer to connected via pipe/line/pipe.
Examples
Referring to fig. 1, a treatment system for industrial wastewater includes an adsorption tank 1, an MCR tank 2, an electrolytic reaction tank 3, and a precipitation tank 4.
The adsorption tank is provided with a water inlet 11 for receiving the industrial wastewater difficult to degrade. The water outlet 14 of the adsorption tank is connected with the water inlet 21 of the MCR tank, and the effluent of the adsorption tank automatically flows into the MCR tank. The adsorption tank is also provided with an activated carbon inlet 13 for receiving regenerated powdered activated carbon. A mechanical stirring device 12 is arranged in the adsorption tank, frame type stirring is adopted, and the linear speed of the edge of the frame is 0.7-1 m/s. And (3) performing powdered activated carbon adsorption treatment on the industrial wastewater difficult to degrade in an adsorption tank.
The MCR tank is provided with a water inlet 21 for receiving the effluent of the adsorption tank. The MCR pool is also provided with a water outlet 24, and the wastewater reaching the detection standard is discharged through the water outlet 24. An immersed ultrafiltration membrane component 22 is arranged in the MCR tank, and the immersed ultrafiltration membrane component is also matched with an aeration device, a water production pump and a backwashing system. And the wastewater treated by the adsorption tank is subjected to further adsorption reaction in the MCR tank, filtered by an ultrafiltration membrane component, and discharged after being inspected to reach the standard. And a return pipeline 23 is also arranged in the MCR tank, the return pipeline 23 is connected with a water inlet 31 of the electrolytic reaction tank, and a part of the powdered activated carbon mixed solution in the MCR tank is pumped into the electrolytic reaction tank for treatment through a water pump 25 through the return pipeline.
The mixed liquid of the powdered activated carbon is subjected to electrolytic regeneration in an electrolytic reaction tank to degrade organic pollutants adsorbed by the activated carbon. The electrolytic reaction tank is provided with a water inlet 31 for receiving the powder activated carbon mixed liquid of the MCR tank. The electrolytic reaction tank is provided with a water outlet 34 for discharging the powdered activated carbon mixed solution after electrolytic regeneration treatment. The water outlet 34 of the electrolytic reaction cell is connected with the water inlet 41 of the precipitation tank. The mixed liquid of the regenerated powdered activated carbon treated by the electrolytic reaction tank automatically flows into a precipitation tank. A cathode plate 32 and an anode plate 33 are arranged in the electrolytic reaction tank; the cathode plate and the anode plate are both anti-corrosion plates, wherein the cathode plate is a titanium plate, and the anode plate is a titanium plate. The distance between the cathode plate and the anode plate is 4 cm. The cell voltage of the electrolytic reaction cell is 10V. The current density is 150A/m2. The electrolytic reaction tank is set as a side-stream process, the regeneration of the powdered activated carbon is carried out in the side stream, and the effluent quality of a main stream process (MCR water production) is not influenced.
The settling tank is provided with a water inlet 41 for receiving the effluent of the regenerated powdered activated carbon mixed liquid of the electrolytic reaction tank. And (3) settling the effluent of the regenerated powdered activated carbon mixed solution in the electrolytic reaction tank in a settling tank. The settling tank is provided with a supernatant outlet 42. The supernatant of the precipitation tank contains high-content pollutants, is discharged through a supernatant outlet, and can be returned to the water inlet end of a sewage treatment plant for treatment or be independently treated by a biochemical process. The bottom of the precipitation tank is provided with an activated carbon outlet 43. The active carbon outlet 43 of the precipitation tank is connected with the active carbon inlet 13 of the adsorption tank. The high-concentration regenerated powdered activated carbon at the bottom of the settling tank is discharged through a bottom outlet and flows back to the adsorption tank for recycling.
The following description is given to specific examples of the application of the treatment system described above to the treatment of refractory industrial wastewater:
taking MBR effluent of a sewage treatment plant in a certain industrial park to carry out continuous treatment experiments, wherein the inflow rate is 1L/h, and the COD is 200 mg/L.
And (3) enabling the wastewater to enter an adsorption tank, wherein the concentration of powdered activated carbon in the adsorption tank is 1500 mg/L, the reaction time of the wastewater in the adsorption tank is 15min, and detecting the COD of the effluent of the adsorption tank to be 40 mg/L.
And (3) enabling the effluent of the adsorption tank to automatically flow into an MCR tank, filtering the effluent by a built-in immersed hollow membrane component, then discharging the effluent, and detecting that the COD of the effluent of the MCR tank is further reduced, wherein the COD is 36 mg/L, the retention time of the wastewater in the MCR tank is 30min, the concentration of the powdered activated carbon is 5000 mg/L, and the COD of the wastewater treated by the MCR tank reaches the discharge standard.
The MCR tank is filled with a mixed liquid of powdered activated carbon with 30% of water inlet flow, the mixed liquid is pumped back to an electrolytic reaction tank, the retention time of the mixed liquid in the electrolytic reaction tank is 30min, a cathode plate and an anode plate are arranged in the electrolytic reaction tank, the cathode plate and the anode plate are both made of titanium, the distance between the plates is 4cm, and the electrolytic current density is 150A/m2The voltage of the tank is 4V, the COD of the mixed liquid effluent of the electrolytic reaction tank is 145.3 mg/L, and the chloride ions of the high-salt-content wastewater in the experimental process are reduced by 150 mg/L in the electrolytic reaction tank, so that the organic matters adsorbed in the activated carbon are desorbed under the action of an electric field of the electrolytic reaction tank, the electrolytic reaction tank is subjected to oxidation reduction reaction to generate chlorine, the oxidation removal of the COD is facilitated, the total COD of the influent water and the total amount of the COD adsorbed in the activated carbon are verified, and 30% of the COD is directly oxidized and removed in the electrolytic process.
The effluent of the mixed liquid of the electrolytic reaction tank automatically flows into a precipitation tank, the powdered activated carbon is further concentrated and settled in the precipitation tank, the concentrated electrolytic regeneration powdered activated carbon is returned to the adsorption tank for recycling, the reflux proportion of the precipitation tank is 30 percent of the water inlet flow, and the rest 70 percent of the supernatant effluent is returned to a biochemical process section for treatment.
The total retention time of the powdered activated carbon from the adsorption reaction in the adsorption tank to the regeneration reflux is about 3h, the experiment of the embodiment is continuously operated for one week, and the COD of the detected water is stabilized at about 40 mg/L, which can meet the first-class A emission standard of GB 18918-2002.
The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and all are included in the scope of the present invention.
Claims (6)
1. A treatment system for industrial wastewater is characterized in that: comprises an adsorption tank, an MCR tank, an electrolytic reaction tank and a precipitation tank;
the adsorption tank is provided with a water inlet, an activated carbon inlet and a water outlet;
the MCR tank is provided with a water inlet, a water outlet, an immersed ultrafiltration membrane component and a return pipeline;
the electrolytic reaction tank is provided with a water inlet and a water outlet;
the sedimentation tank is provided with a water inlet, a supernatant outlet and an activated carbon outlet;
the water outlet of the adsorption tank is connected with the water inlet of the MCR tank;
the return pipeline of the MCR tank is connected with the water inlet of the electrolytic reaction tank;
the water outlet of the electrolytic reaction tank is connected with the water inlet of the sedimentation tank;
an active carbon outlet of the precipitation tank is connected with an active carbon inlet of the adsorption tank;
the adsorption tank is used for receiving industrial wastewater and performing powdered activated carbon adsorption treatment on the industrial wastewater;
the MCR pool is used for receiving the effluent of the adsorption pool, and performing adsorption and filtration treatment on the effluent of the adsorption pool;
the electrolytic reaction tank is used for receiving the powdered activated carbon mixed solution of the MCR tank and carrying out electrolytic regeneration treatment on the powdered activated carbon mixed solution;
the settling tank is used for receiving the effluent of the electrolytic reaction tank and settling the effluent of the electrolytic reaction tank.
2. The system for treating industrial wastewater according to claim 1, wherein: and a mechanical stirring device is arranged in the adsorption tank.
3. The system for treating industrial wastewater according to claim 1, wherein: and the return pipeline of the MCR tank is connected with the water inlet of the electrolytic reaction tank through a water suction pump.
4. The system for treating industrial wastewater according to claim 1, wherein: and a cathode plate and an anode plate are arranged in the electrolytic reaction tank.
5. The system for treating industrial wastewater according to claim 4, wherein: the distance between the cathode plate and the anode plate in the electrolytic reaction tank is 2 cm-15 cm.
6. The system for treating industrial wastewater according to claim 1, wherein: and an activated carbon outlet of the settling tank is arranged at the bottom of the settling tank.
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| CN201921781308.9U CN211198890U (en) | 2019-10-22 | 2019-10-22 | Industrial wastewater treatment system |
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| CN112573750A (en) * | 2020-12-08 | 2021-03-30 | 广州中国科学院先进技术研究所 | Method for controlling whiteness and organic matter content of byproduct salt in crystallization process of high-salinity wastewater |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112573750A (en) * | 2020-12-08 | 2021-03-30 | 广州中国科学院先进技术研究所 | Method for controlling whiteness and organic matter content of byproduct salt in crystallization process of high-salinity wastewater |
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