CN116813127A - Industrial high-salt wastewater treatment method and system - Google Patents
Industrial high-salt wastewater treatment method and system Download PDFInfo
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- CN116813127A CN116813127A CN202310839276.8A CN202310839276A CN116813127A CN 116813127 A CN116813127 A CN 116813127A CN 202310839276 A CN202310839276 A CN 202310839276A CN 116813127 A CN116813127 A CN 116813127A
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- 239000002351 wastewater Substances 0.000 claims abstract description 112
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- 238000005496 tempering Methods 0.000 claims abstract description 35
- 230000003647 oxidation Effects 0.000 claims abstract description 33
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 33
- 238000005868 electrolysis reaction Methods 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 21
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- 239000007788 liquid Substances 0.000 claims description 55
- 238000001223 reverse osmosis Methods 0.000 claims description 51
- 239000007789 gas Substances 0.000 claims description 36
- 238000003860 storage Methods 0.000 claims description 26
- 239000000460 chlorine Substances 0.000 claims description 21
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 20
- 238000010521 absorption reaction Methods 0.000 claims description 20
- 229910052801 chlorine Inorganic materials 0.000 claims description 20
- WGKMWBIFNQLOKM-UHFFFAOYSA-N [O].[Cl] Chemical compound [O].[Cl] WGKMWBIFNQLOKM-UHFFFAOYSA-N 0.000 claims description 19
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 16
- 239000001257 hydrogen Substances 0.000 claims description 16
- 229910052739 hydrogen Inorganic materials 0.000 claims description 16
- 239000001301 oxygen Substances 0.000 claims description 16
- 229910052760 oxygen Inorganic materials 0.000 claims description 16
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 15
- 239000003795 chemical substances by application Substances 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 10
- 239000007800 oxidant agent Substances 0.000 claims description 10
- 238000001556 precipitation Methods 0.000 claims description 10
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 24
- 239000000498 cooling water Substances 0.000 description 16
- 239000012528 membrane Substances 0.000 description 12
- 230000009286 beneficial effect Effects 0.000 description 9
- 238000004064 recycling Methods 0.000 description 8
- 210000005056 cell body Anatomy 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 7
- 239000005708 Sodium hypochlorite Substances 0.000 description 5
- 239000012535 impurity Substances 0.000 description 5
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 5
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- 150000002431 hydrogen Chemical class 0.000 description 2
- 239000010842 industrial wastewater Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
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- 229910002651 NO3 Inorganic materials 0.000 description 1
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
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- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention relates to a method and a system for treating industrial high-salt wastewater, which relate to the field of wastewater treatment, wherein the high-salt wastewater is treated into desalted wastewater through pretreatment and electrolysis steps, and the wastewater can reach the standard and be discharged after further advanced treatment, so that the utilization of salt resources is realized; the mixed acid solution and the mixed alkali solution produced by the electrolysis of the high-salt wastewater are recycled for tempering and oxidation treatment of the high-salt wastewater, and no additional medicament is needed to be added, so that the method is self-sufficient; can also be used for industrial production, and the wastewater treatment cost is reduced by phase change. And the energy consumption of the electrolysis equipment is lower than that of the thermal concentration treatment equipment, so that the energy is saved. The processing system is equipment for realizing the processing method.
Description
Technical Field
The invention relates to the field of wastewater treatment, in particular to an industrial high-salt wastewater treatment method and system.
Background
Industrial activities produce wastewater when it contains more than one percent of inorganic salts, known as high salt industrial wastewater. Inorganic salts are those including sodium, potassium, calcium, chloride, sulfate, nitrate, etc., and are commonly found in chemical industries such as petrochemical, coalification, and electric power industries. When the high-salt-content wastewater is directly discharged to the outside without treatment, the self-regulation balance capacity of the ecological system is affected, the local ecological system is seriously damaged, but the wastewater can be discharged in the nearby sea area after effective treatment.
The conventional treatment methods for the industrial wastewater with high salt content mainly comprise three methods: biological oxidation, membrane and thermal concentration. However, when the salt content in the wastewater exceeds 2% or more, the conventional biological method is not effective any more. In recent years, the thermal concentration method includes a plurality of new technologies including a mechanical vapor recompression technology, an advanced oxidation technology, a forward osmosis technology, and incineration treatment of wastewater, and the treatment of wastewater often uses a plurality of treatment technologies. The heat concentration treatment of high-salt water generally has the defects of higher energy consumption and equipment scaling or corrosion caused by high operation temperature, and finished salt contains more impurities and is classified as dangerous waste according to different sources, so that the treatment cost is high. Compared with thermal concentration, the membrane separation technology has the characteristics of simple operation and low energy consumption, but the application of the membrane technology is restricted due to the price of the membrane and the problem that the membrane is easy to pollute and damage. It is therefore necessary to find an economical and stable method for treating high-salt wastewater.
Disclosure of Invention
The invention aims to solve the technical problem of how to provide an economical and stable high-salt wastewater treatment method.
The technical scheme for solving the technical problems is as follows: the industrial high-salt wastewater treatment method comprises the following steps:
pretreatment: firstly oxidizing industrial high-salt wastewater to remove COD in the high-salt wastewater, then performing tempering treatment, adjusting the pH of the high-salt wastewater to be neutral, and finally performing precipitation treatment to remove suspended solid matters in the high-salt wastewater;
and (3) electrolysis: electrolyzing the pretreated high-salt wastewater to obtain a mixed acid solution, a mixed alkali solution, desalted wastewater, oxygen, chlorine and hydrogen; wherein, the mixed acid solution is reused for the thermal refining of the high-salt wastewater, and the mixed alkali solution and the chlorine are reused for the oxidation treatment of the high-salt wastewater.
The beneficial effects of the invention are as follows: the high-salt wastewater is treated into desalted wastewater through pretreatment and electrolysis, and the effluent can reach the standard after further advanced treatment, so that the salt resource utilization is realized; the mixed acid solution and the mixed alkali solution produced by the electrolysis of the high-salt wastewater are reused for tempering and oxidation treatment of the high-salt wastewater, and no additional medicament is needed to be added, so that the method is self-sufficient; can also be used for industrial production, and the wastewater treatment cost is reduced by phase change. And the energy consumption of the electrolysis equipment is lower than that of the thermal concentration treatment equipment, so that the energy is saved.
On the basis of the technical scheme, the invention can be improved as follows.
Further, the method also comprises the following steps of: and (5) carrying out advanced treatment on the desalted wastewater, and discharging the desalted wastewater after reaching the standard.
The beneficial effects of adopting the further scheme are as follows: advanced treatment further filters the desalted wastewater to achieve discharge standards.
Optionally, the advanced treatment is reverse osmosis filtration, the desalted wastewater after the reverse osmosis filtration is divided into concentrated solution and clear solution, and the clear solution is discharged.
The beneficial effects of adopting the further scheme are as follows: and (3) further removing inorganic salts, organic matters, bacteria, viruses and other impurities in the water through reverse osmosis filtration, so that clear liquid is discharged up to the standard. The wastewater is desalted and then reverse osmosis filtered, so that the burden of the reverse osmosis membrane is reduced, the service life of the reverse osmosis membrane is prolonged, and the replacement frequency and the use cost of the reverse osmosis membrane are reduced.
Further, the concentrated solution is refluxed to the pretreated high-salt wastewater.
The beneficial effects of adopting the further scheme are as follows: the concentrated solution is mixed with the inlet water of the electrolysis process and then enters the electrolysis tank again, thereby realizing the purposes of recycling and recycling the desulfurization wastewater.
Further, after the oxidation treatment, COD in the high-salt wastewater is less than or equal to 200mg/L.
The invention also provides an industrial high-salt wastewater treatment system, which comprises pretreatment equipment and an electrolytic tank, wherein the pretreatment equipment comprises an oxidation tank, a tempering tank and a sedimentation tank which are sequentially communicated,
the electrolytic tank is provided with a liquid inlet, a mixed acid solution outlet, a mixed alkali solution outlet, a desalted wastewater outlet, a positive electrode gas outlet and a negative electrode gas outlet, wherein a supernatant outlet of the settling tank is communicated with the liquid inlet of the electrolytic tank, the mixed acid solution outlet is communicated with a tempering agent inlet of the tempering tank, and both the mixed alkali solution outlet and the positive electrode gas outlet are communicated with an oxidizing agent inlet of the oxidation tank.
The beneficial effects are that: the oxidation, tempering and precipitation pretreatment of the high-salt wastewater are realized through an oxidation tank, a tempering tank and a settling tank, supernatant fluid in the settling tank is introduced into an electrolytic tank for electrolysis after precipitation, and high-salt wastewater electrolysis products comprise desalted wastewater, mixed acid solution, mixed alkali solution, oxygen, chlorine and hydrogen, so that the desalted wastewater can reach the standard for discharging after further advanced treatment, and the utilization of salt resources is realized; the mixed acid solution and the mixed alkali solution can be used for a tempering tank and an oxidation tank and are used as agents for tempering and oxidation treatment of high-salt wastewater, and no additional agent is needed to be added, so that the method is self-sufficient; the mixed acid solution and the mixed alkali solution can also be used for industrial production, and the phase change reduces the wastewater treatment cost. And the energy consumption of the electrolytic tank is lower than that of the thermal concentration treatment equipment, so that the energy is saved.
Further, the desalination device comprises a reverse osmosis device, wherein the reverse osmosis device is provided with a reverse osmosis liquid inlet, a reverse osmosis concentrated liquid outlet and a reverse osmosis clear liquid outlet, the reverse osmosis liquid inlet is communicated with the desalination wastewater outlet, and the reverse osmosis concentrated liquid outlet is communicated with the liquid inlet.
The beneficial effects of adopting the further scheme are as follows: and filtering desalted wastewater by a reverse osmosis device to further remove inorganic salts, organic matters, bacteria, viruses and other impurities in the water, so that clear liquid is discharged up to the standard.
Further, the device also comprises an acid liquor storage tank, an alkali liquor storage tank and an alkali absorption tank, wherein the outlet of the mixed acid liquor is communicated with the inlet of the acid liquor storage tank, the outlet of the mixed alkali liquor storage tank is communicated with the inlet of the alkali liquor storage tank, the outlet of the acid liquor storage tank is communicated with the inlet of the tempering agent of the tempering tank, the outlet of the alkali liquor storage tank and the outlet of the positive electrode gas are communicated with the inlet of the alkali absorption tank, and the outlet of the alkali absorption tank is communicated with the inlet of the oxidizing agent of the oxidation tank.
The beneficial effects of adopting the further scheme are as follows: the acid liquor storage tank and the alkali liquor storage tank are respectively used for storing the mixed acid solution and the mixed alkali solution generated by electrolysis, and the stored mixed acid solution and mixed alkali solution can be used for treating high-salt wastewater or used for industrial production or selling. The mixed alkali solution is mixed with chlorine generated by the positive electrode of the electrolytic tank to generate sodium hypochlorite solution which can be used as an oxidizing agent in the oxidizing tank.
Further, the device also comprises a hydrogen collecting tank and an oxygen-chlorine collecting tank, wherein the negative electrode gas outlet is communicated with the hydrogen collecting tank, and the positive electrode gas outlet is respectively communicated with the oxygen-chlorine collecting tank and the inlet of the alkali absorption tank, or the positive electrode gas outlet, the oxygen-chlorine collecting tank and the inlet of the alkali absorption tank are sequentially communicated.
The beneficial effects of adopting the further scheme are as follows: the hydrogen collecting tank and the oxygen-chlorine collecting tank are respectively used for collecting gases generated by the cathode and the anode of the electrolytic cell. Wherein, the gas generated by the positive electrode of the electrolytic tank is oxygen and chlorine, one part of the oxygen and the chlorine can be stored by an oxygen-chlorine collecting tank, and the other part of the oxygen and the chlorine are reacted with the mixed alkali solution to generate sodium hypochlorite solution; or, all the oxygen and the chlorine generated by the positive electrode of the electrolytic tank are stored in an oxygen-chlorine collecting tank, and then the oxygen-chlorine collecting tank is introduced into the alkali absorption tank according to the requirement.
Further, the electrolysis trough includes cell body, positive plate and negative plate, the positive plate with the negative plate are parallel to each other and respectively vertical set up in the both ends of cell body, the middle part of cell body upper end has the aforesaid the inlet, the cell body corresponds to be located the position of positive plate below is equipped with the mixed acid solution export, the cell body corresponds to be located the position of negative plate below is equipped with the mixed alkali solution export, the middle part of cell body lower extreme is equipped with desalted waste water export, the cell body corresponds to be located the positive plate with the position of negative plate top has respectively the gaseous export of positive pole with the gaseous export of negative pole.
The beneficial effects of adopting the further scheme are as follows: the electrolytic tank is a vertical electrophoresis tank, the flowing direction of liquid is vertical to the direction of an electric field, inlet water enters from a liquid inlet in the center of the top plate, anions and cations respectively move to the positive plate and the negative plate, and water electrolysis occurs near the electrodes, so that desalted wastewater, mixed acid solution, mixed alkali solution, oxygen, chlorine and hydrogen are generated.
The industrial high-salt wastewater treatment method adopts oxidation, tempering, precipitation, vertical electrophoresis and reverse osmosis filtration to treat the high-salt wastewater. The oxidation, tempering and precipitation steps are pretreatment to remove COD (chemical oxygen demand) and SS (Suspended Substance, suspended substances in water) and other substances in the wastewater, and vertical electrophoresis can separate acid and alkali from the high-salt wastewater under the action of an electric field for oxidation tempering or industrial production, and the wastewater with reduced salt can be directly further treated by a reverse osmosis membrane, so that the wastewater can be discharged directly up to the standard. The whole process not only realizes the standard discharge of high-salt wastewater, but also produces finished acid and alkali for production in a recycling way, thereby saving the cost.
Drawings
FIG. 1 is a schematic diagram of an industrial high salt wastewater treatment system of the present invention.
In the drawings, the list of components represented by the various numbers is as follows:
1. an oxidation tank; 2. a tempering tank; 3. a settling tank; 4. an inlet pump; 5. an electrolytic cell; 6. an acid liquid storage tank; 7. an alkali liquor storage tank; 8. a reverse osmosis device; 9. a clean water tank; 10. an anode fan; 11. a negative electrode blower; 12. an electrolytic circulating cooling water inlet; 13. a hydrogen collection tank; 14. an oxygen chlorine gas collection tank; 15. an alkali absorption tank; 16. an outlet pump; 17. a reverse osmosis cooling water outlet; 18. and an overflow port.
Detailed Description
The principles and features of the present invention are described below with examples given for the purpose of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, the embodiment provides a method for treating industrial high-salt wastewater, which comprises the following steps:
pretreatment: firstly oxidizing industrial high-salt wastewater to remove COD in the high-salt wastewater, then performing tempering treatment, adjusting the pH of the high-salt wastewater to be neutral, and finally performing precipitation treatment to remove suspended solid matters in the high-salt wastewater;
and (3) electrolysis: electrolyzing the pretreated high-salt wastewater to obtain a mixed acid solution, a mixed alkali solution, desalted wastewater, oxygen, chlorine and hydrogen; wherein, the mixed acid solution is reused for the thermal refining of the high-salt wastewater, and the mixed alkali solution and the chlorine are reused for the oxidation treatment of the high-salt wastewater.
Thus, the high-salt wastewater is treated into desalted wastewater through pretreatment and electrolysis, and the effluent can reach the standard after further advanced treatment, and the salt resource utilization is realized; the mixed acid solution and the mixed alkali solution produced by the electrolysis of the high-salt wastewater are reused for tempering and oxidation treatment of the high-salt wastewater, and no additional medicament is needed to be added, so that the method is self-sufficient; can also be used for industrial production, and the wastewater treatment cost is reduced by phase change. And the energy consumption of the electrolysis equipment is lower than that of the thermal concentration treatment equipment, so that the energy is saved.
On the basis of the technical scheme, the method further comprises the following steps of: and (5) carrying out advanced treatment on the desalted wastewater, and discharging the desalted wastewater after reaching the standard.
Advanced treatment further filters the desalted wastewater to achieve discharge standards.
Optionally, the advanced treatment is reverse osmosis filtration, the desalted wastewater after the reverse osmosis filtration is divided into concentrated solution and clear solution, and the clear solution is discharged.
And (3) further removing inorganic salts, organic matters, bacteria, viruses and other impurities in the water through reverse osmosis filtration, so that clear liquid is discharged up to the standard. The wastewater is desalted and then reverse osmosis filtered, so that the burden of the reverse osmosis membrane is reduced, the service life of the reverse osmosis membrane is prolonged, and the replacement frequency and the use cost of the reverse osmosis membrane are reduced.
On the basis of the technical scheme, the concentrated solution flows back to the pretreated high-salt wastewater.
The concentrated solution is mixed with the inlet water of the electrolysis process and then enters the electrolysis tank again, thereby realizing the purposes of recycling and recycling the desulfurization wastewater.
On the basis of the technical scheme, after the oxidation treatment, COD in the high-salt wastewater is less than or equal to 200mg/L.
The invention also provides an industrial high-salt wastewater treatment system which comprises pretreatment equipment and an electrolytic tank 5, wherein the pretreatment equipment comprises an oxidation tank 1, a tempering tank 2 and a sedimentation tank 3 which are sequentially communicated,
the electrolytic tank 5 is provided with a liquid inlet, a mixed acid solution outlet, a mixed alkali solution outlet, a desalted wastewater outlet, a positive electrode gas outlet and a negative electrode gas outlet, the supernatant outlet of the settling tank 3 is communicated with the liquid inlet of the electrolytic tank 5, the mixed acid solution outlet is communicated with the tempering agent inlet of the tempering tank 2, and the mixed alkali solution outlet and the positive electrode gas outlet are both communicated with the oxidizing agent inlet of the oxidation tank 1.
The oxidation, tempering and precipitation pretreatment of the high-salt wastewater are realized through the oxidation tank 1, the tempering tank 2 and the sedimentation tank 3, the supernatant in the sedimentation tank 3 is introduced into the electrolysis tank 5 for electrolysis after precipitation, the high-salt wastewater electrolysis products comprise desalted wastewater, mixed acid solution, mixed alkali solution, oxygen, chlorine and hydrogen, and the desalted wastewater can realize the standard discharge of effluent after further advanced treatment and realize the recycling of salt; the mixed acid solution and the mixed alkali solution can be reused in the tempering tank 2 and the oxidation tank 1 and are used as agents for tempering and oxidizing treatment of the high-salt wastewater, and no additional agent is needed to be added, so that the method is self-sufficient; the mixed acid solution and the mixed alkali solution can also be used for industrial production, and the phase change reduces the wastewater treatment cost. And the energy consumption of the electrolytic tank 5 is lower than that of the thermal concentration treatment equipment, so that the energy is saved.
Optionally, at least one liquid inlet, mixed acid solution outlet, mixed alkali solution outlet and desalted waste water outlet are respectively arranged, and a plurality of liquid inlets or outlets are respectively arranged for increasing liquid inlet or liquid outlet speed.
Specifically, the bottom of the settling tank 3 is in an inverted cone shape and is provided with a sewage outlet, and a supernatant outlet is positioned on the side wall of the upper part of the settling tank 3.
Specifically, the supernatant outlet of the settling tank 3 is communicated with the liquid inlet of the electrolytic tank 5 through the inlet pump 4, so that the blockage of the inlet pump 4 can be avoided in tempering, oxidation and precipitation treatment, and pretreated water is pumped into the electrolytic tank 5 through the inlet pump 4 at a certain flow rate.
In particular, the inlet pump 4 is a centrifugal pump for controlling the flow rate of the water flow into the electrolytic cell 5.
Specifically, the electrolytic tank 5 is provided with a circulating cooling water pipe, and the temperature of the electrolytic tank 5 is reduced by the circulating cooling water. The circulating cooling water enters the circulating cooling water pipe from the electrolytic circulating cooling water inlet 12 and exchanges heat with the electrolytic tank 5, then is discharged, exchanges heat with the cooling medium, and then enters the circulating cooling water pipe from the electrolytic circulating cooling water inlet 12 to circulate. More specifically, the recirculating cooling water line ensures that the temperature of the electrolytic tank 5 is less than or equal to 40 ℃.
Specifically, the side wall of the upper part of the electrolytic tank 5 is also provided with an overflow port 18, and when the water level in the electrolytic tank 5 is too high, the water can overflow through the overflow port 18.
On the basis of the technical scheme, the industrial high-salt wastewater treatment system further comprises a reverse osmosis device 8, wherein the reverse osmosis device 8 is provided with a reverse osmosis liquid inlet, a reverse osmosis concentrated liquid outlet and a reverse osmosis clear liquid outlet, the reverse osmosis liquid inlet is communicated with the desalted wastewater outlet, and the reverse osmosis concentrated liquid outlet is communicated with the liquid inlet.
The desalted wastewater is filtered by a reverse osmosis device 8, and inorganic salts, organic matters, bacteria, viruses and other impurities in the water are further removed, so that clear liquid is discharged after reaching standards.
Specifically, the reverse osmosis device 8 is provided with a circulating cooling water pipe, and the temperature of the reverse osmosis device 8 is reduced by circulating cooling water. The circulating cooling water enters the circulating cooling water pipe and exchanges heat with the reverse osmosis device 8, then is discharged from the reverse osmosis cooling water outlet 17, exchanges heat with the cooling medium, and then enters the circulating cooling water pipe to circulate.
Specifically, the desalted wastewater outlet communicates with the reverse osmosis feed through an outlet pump 16.
Further, the clear water outlet of the reverse osmosis is also communicated with a clear water tank 9 for storing the treated clear water, and the clear water is discharged from the clear water tank 9.
On the basis of the technical scheme, the industrial high-salt wastewater treatment system further comprises an acid liquid storage tank 6, an alkali liquid storage tank 7 and an alkali absorption tank 15, wherein an outlet of the mixed acid liquid is communicated with an inlet of the acid liquid storage tank 6, an outlet of the mixed alkali liquid is communicated with an inlet of the alkali liquid storage tank 7, an outlet of the acid liquid storage tank 6 is communicated with a tempering agent inlet of the tempering tank 2, an outlet of the alkali liquid storage tank 7 and an outlet of the anode gas are communicated with an inlet of the alkali absorption tank 15, and an outlet of the alkali absorption tank 15 is communicated with an oxidizing agent inlet of the oxidation tank 1.
The acid liquid storage tank 6 and the alkali liquid storage tank 7 are respectively used for storing the mixed acid solution and the mixed alkali solution generated by electrolysis, and the stored mixed acid solution and mixed alkali solution can be used for treating high-salt wastewater or used for industrial production or selling. The mixed alkali solution is mixed with chlorine generated by the anode of the electrolytic tank 5 to generate sodium hypochlorite solution which can be used as an oxidizing agent in the oxidizing tank 1.
On the basis of the technical scheme, the industrial high-salt wastewater treatment system further comprises a hydrogen collection tank 13 and an oxygen-chlorine collection tank 14, wherein the negative electrode gas outlet is communicated with the hydrogen collection tank 13, and the positive electrode gas outlet is respectively communicated with the oxygen-chlorine collection tank 14 and the inlet of the alkali absorption tank 15, or the positive electrode gas outlet, the oxygen-chlorine collection tank 14 and the inlet of the alkali absorption tank 15 are sequentially communicated.
The hydrogen gas collection tank 13 and the oxygen-chlorine gas collection tank 14 are used for collecting the gas generated by the negative electrode and the positive electrode of the electrolytic cell 5, respectively. Wherein, the gas generated by the positive electrode of the electrolytic tank 5 is oxygen and chlorine, one part of the oxygen and the chlorine can be stored by the oxygen-chlorine collecting tank 14, and the other part of the oxygen and the chlorine are reacted with the mixed alkali solution to generate sodium hypochlorite solution in the alkali absorbing tank 15; alternatively, all of the oxygen and chlorine generated at the positive electrode of the electrolytic bath 5 are stored in the oxygen-chlorine gas collection tank 14, and then, if necessary, the oxygen-chlorine gas collection tank 14 is fed to the alkali absorption tank 15.
In one specific example, the anode gas outlet communicates with the hydrogen collection tank 13 through the anode blower 11. The outlet of the positive gas is communicated with the inlet of the positive blower 10, and the outlet of the positive blower 10 is respectively communicated with the inlets of the oxygen-chlorine gas collecting tank 14 and the alkali absorption tank 15.
On the basis of the technical scheme, the electrolytic tank 5 comprises a tank body, a positive plate and a negative plate, wherein the positive plate and the negative plate are mutually parallel and are respectively and vertically arranged at two ends of the tank body, the liquid inlet is formed in the middle of the upper end of the tank body, the mixed acid solution outlet is formed in the position, corresponding to the position, located below the positive plate, of the tank body, the mixed alkali solution outlet is formed in the position, corresponding to the position, located below the negative plate, of the tank body, the desalted wastewater outlet is formed in the middle of the lower end of the tank body, and the positive gas outlet and the negative gas outlet are formed in the positions, corresponding to the positions, located above the positive plate and the negative plate, of the tank body.
The electrolytic tank 5 is a vertical electrophoresis tank, the flowing direction of liquid is vertical to the direction of electric field, inlet water enters from the liquid inlet in the center of the top plate, anions and cations respectively move to the positive and negative plates, and water electrolysis occurs near the electrodes, so that desalted wastewater, mixed acid solution, mixed alkali solution, oxygen, chlorine and hydrogen are generated.
Specifically, the groove body is filled with filling particles. In one example, the tank body is filled with quartz sand particles, so that high-salt wastewater can be better dispersed, and the residence time is prolonged. Alternatively, the tank body can be filled with other filling particles.
Further, each of the devices in the present embodiment is provided with a flow meter, a liquid level meter, a pressure meter, a pH meter, an evacuation valve, and the like (pipe fittings and a detection meter are not shown).
The working process of the industrial high-salt wastewater treatment system is as follows: the high-salt wastewater enters an oxidation tank 1, an oxidant (the oxidant is sodium hypochlorite solution in an alkali absorption tank 15) is added to remove COD, then acid (mixed acid solution in an acid liquor storage tank 6) is added to a tempering tank 2 to temper, the pH of the wastewater is adjusted to be neutral, the effluent enters a sedimentation tank 3, the supernatant and the lower sediment are formed by sedimentation in the sedimentation tank 3, and the supernatant enters an electrolytic tank 5.
Under the action of electric field, anions and cations in the salt of the waste water migrate to the direction of the electrode, and anions such as Cl - 、SO 4 2- Enriching in the positive plate and forming a mixed acid solution; cations such as Na + Enriching the negative plate to form a mixed alkali solution; the intermediate desalted waste water outlet can obtain desalted waste water. The desalted wastewater is subjected to reverse osmosis treatment by a reverse osmosis device 8, the effluent is discharged after reaching the standard, the concentrated solution flows back to the water inlet of the electrolytic tank 5, and the mixed water enters the electrolytic tank 5 again after being mixed, so that the purposes of recycling and recycling the desulfurized wastewater are realized.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (10)
1. The industrial high-salt wastewater treatment method is characterized by comprising the following steps of:
pretreatment: firstly oxidizing industrial high-salt wastewater to remove COD in the high-salt wastewater, then performing tempering treatment, adjusting the pH of the high-salt wastewater to be neutral, and finally performing precipitation treatment to remove suspended solid matters in the high-salt wastewater;
and (3) electrolysis: electrolyzing the pretreated high-salt wastewater to obtain a mixed acid solution, a mixed alkali solution, desalted wastewater, oxygen, chlorine and hydrogen; wherein, the mixed acid solution is reused for the thermal refining of the high-salt wastewater, and the mixed alkali solution and the chlorine are reused for the oxidation treatment of the high-salt wastewater.
2. The method for treating industrial high-salt wastewater according to claim 1, further comprising the step of advanced treatment: and (5) carrying out advanced treatment on the desalted wastewater, and discharging the desalted wastewater after reaching the standard.
3. The method for treating industrial high-salt wastewater according to claim 2, wherein the advanced treatment is reverse osmosis filtration, the desalted wastewater after the reverse osmosis filtration is separated into a concentrate and a clear liquid, and the clear liquid is discharged.
4. A method of treating industrial high-salt wastewater as claimed in claim 3, wherein the concentrate is refluxed to the pretreated high-salt wastewater.
5. The method for treating industrial high-salt wastewater according to any one of claims 1 to 4, wherein COD in the high-salt wastewater after the oxidation treatment is 200mg/L or less.
6. The industrial high-salt wastewater treatment system is characterized by comprising pretreatment equipment and an electrolytic tank (5), wherein the pretreatment equipment comprises an oxidation tank (1), a tempering tank (2) and a sedimentation tank (3) which are sequentially communicated,
the electrolytic tank (5) is provided with a liquid inlet, a mixed acid solution outlet, a mixed alkali solution outlet, a desalted wastewater outlet, a positive electrode gas outlet and a negative electrode gas outlet, the supernatant outlet of the settling tank (3) is communicated with the liquid inlet of the electrolytic tank (5), the mixed acid solution outlet is communicated with a tempering agent inlet of the tempering tank (2), and the mixed alkali solution outlet and the positive electrode gas outlet are both communicated with an oxidizing agent inlet of the oxidation tank (1).
7. The industrial high salt wastewater treatment system of claim 6, further comprising a reverse osmosis device (8), the reverse osmosis device (8) having a reverse osmosis feed, a reverse osmosis concentrate outlet and a reverse osmosis supernatant outlet, the reverse osmosis feed being in communication with the desalinated wastewater outlet, the reverse osmosis concentrate outlet being in communication with the feed.
8. The industrial high-salt wastewater treatment system according to claim 6, further comprising an acid liquid storage tank (6), an alkali liquid storage tank (7) and an alkali absorption tank (15), wherein the outlet of the mixed acid liquid is communicated with the inlet of the acid liquid storage tank (6), the outlet of the mixed alkali liquid is communicated with the inlet of the alkali liquid storage tank (7), the outlet of the acid liquid storage tank (6) is communicated with the tempering agent inlet of the tempering tank (2), the outlet of the alkali liquid storage tank (7) and the outlet of the positive electrode gas are communicated with the inlet of the alkali absorption tank (15), and the outlet of the alkali absorption tank (15) is communicated with the oxidizing agent inlet of the oxidation tank (1).
9. The industrial high-salt wastewater treatment system according to claim 8, further comprising a hydrogen collection tank (13) and an oxygen-chlorine collection tank (14), wherein the negative electrode gas outlet is communicated with the hydrogen collection tank (13), and the positive electrode gas outlet is respectively communicated with the oxygen-chlorine collection tank (14) and the inlet of the alkali absorption tank (15), or the positive electrode gas outlet, the oxygen-chlorine collection tank (14) and the inlet of the alkali absorption tank (15) are sequentially communicated.
10. The industrial high-salt wastewater treatment system according to any one of claims 6 to 9, wherein the electrolytic tank (5) comprises a tank body, a positive plate and a negative plate, the positive plate and the negative plate are mutually parallel and are respectively and vertically arranged at two ends of the tank body, the liquid inlet is arranged in the middle of the upper end of the tank body, the mixed acid solution outlet is arranged at the position of the tank body, which is positioned below the positive plate, the mixed alkali solution outlet is arranged at the position of the tank body, which is positioned below the negative plate, the desalted wastewater outlet is arranged in the middle of the lower end of the tank body, and the positive gas outlet and the negative gas outlet are respectively arranged at the positions of the tank body, which are positioned above the positive plate and the negative plate.
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| CN202310839276.8A CN116813127A (en) | 2023-07-10 | 2023-07-10 | Industrial high-salt wastewater treatment method and system |
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