CN110668619A - Lead-zinc industrial mineral processing wastewater treatment device and treatment method - Google Patents
Lead-zinc industrial mineral processing wastewater treatment device and treatment method Download PDFInfo
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Abstract
The invention discloses a lead-zinc industrial mineral processing wastewater treatment device and a treatment method, mineral processing wastewater is treated by a pretreatment tank and then discharged into a sedimentation tank to settle large-particle-size solids, supernatant of the sedimentation tank flows through a catalytic oxidation denitrification device to remove most organic matters, the treated wastewater is discharged into an electrochemical device to remove most heavy metal pollutants and residual trace organic matters in the water; the floating sludge produced by the electrochemical device is scraped by the deslagging device and then discharged into the sand filtering device for deep filtration, and the filtrate can be discharged or recycled for the mineral separation process. Through the multistage advanced treatment who adopts catalytic oxidation denitrification device + electrochemical device + sand filtration device, can get rid of organic matter, heavy metal in the waste water completely, go out water quality of water stable and reach III class emission standard in "surface water environmental quality standard", pretreatment tank only need adjust pH can, need not to add extra medicament, reduced the running cost, the practicality is strong, carries the mark transformation to current ore dressing trade and has important meaning.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a lead-zinc industrial mineral processing wastewater treatment device and a treatment method.
Background
The main pollutants of the lead-zinc industrial mineral processing wastewater comprise: the mineral dressing agent contains copper, zinc, cadmium, arsenic, lead and other heavy metals, xanthate, black powder, No. two oil and other mineral dressing agents, and has the characteristics of complex components, high toxicity, difficult degradation, smelly water body, difficult biochemical treatment and the like. In recent years, due to the increasing awareness of environmental protection and the environmental protection emphasis of the state, the mineral processing wastewater discharge standard is improved from the lead-zinc industrial pollutant discharge standard (GB25466-2010) to the III-type effluent standard in the surface water environmental quality standard (GB3838-2002) in part of regions, so that various environmental protection people perform a great deal of research on the treatment of organic matters in the mineral processing wastewater, and in the research, the treatment of (ammonia) nitrides in the wastewater is rarely mentioned. Meanwhile, market research finds that in recent years, part of concentrating plants often generate overproof effluent ammonia nitrogen and total nitrogen, and the original process and part of upgrading and modifying processes cannot meet the emission requirement.
At present, the mainstream method for treating wastewater of various lead-zinc industrial concentrating mills is to use NaOH and Na2S and the like are precipitator, and the chemical precipitation treatment process has a good effect of removing heavy metal elements, but has no obvious effect of removing organic matters in the wastewater; the ozone and electrochemical combined process has good removal effect on COD and heavy metals in water, but has no obvious removal effect on ammonia nitrogen, nitrate nitrogen and the like; the NF/RO process water is stable and reaches the standard, but the membrane core has high cost, short service life and easy blockage, and the concentrated solution (accounting for more than 30 percent of the wastewater) of the membrane method needs an additional treatment process, thereby increasing the operation cost.
Disclosure of Invention
The invention aims to provide a lead-zinc industrial mineral processing wastewater treatment device and a treatment method, which can reduce the operation cost on the premise of ensuring that heavy metal, COD (chemical oxygen demand), ammonia nitrogen and total nitrogen in treated effluent all reach the standard.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a lead-zinc industrial mineral processing wastewater treatment device, which is characterized in that: comprises a pretreatment tank, a sedimentation tank, a catalytic oxidation denitrification device, an electrochemical device and a sand filtration device which are connected in sequence; the gas inlet of the catalytic oxidation denitrification device is connected with an ozone generating device, the gas outlet of the catalytic oxidation denitrification device is connected with an ozone destroying device, and the top end of the catalytic oxidation denitrification device is provided with a dosing port connected with a catalyst dosing device; the water outlet of the sand filtering device is connected with a water outlet discharge port; the electrochemical device is connected with a deslagging device communicated with the horizontal liquid level in the electrochemical device, and the deslagging device is connected with the sedimentation tank through a sludge return pipe.
Optionally, the bottom mud discharging port of the sedimentation tank is connected with a sludge dewatering machine, the mud outlet of the sludge dewatering machine is connected with a sludge hopper, and the sludge dewatering machine is connected with the pretreatment tank through a filtrate return pipe.
Optionally, the agent added by the catalyst adding device is sodium hypochlorite or chlorine dioxide.
Optionally, a dosing device is connected above the pretreatment tank, and the dosed medicament is one of sodium carbonate, sodium bicarbonate, calcium oxide or sodium hydroxide.
Optionally, the adding amount of ozone of the catalytic oxidation denitrification device is 20-80 g/h; the tail gas is purified by the ozone destruction device.
Optionally, a pure aluminum electrode group and a power supply connected with the pure aluminum electrode group are arranged in the electrochemical device; the inter-electrode distance between the cathode and the anode in the pure aluminum electrode group is 10-30 mm, and the current density is 20-50A/m2The electrochemical hydraulic retention time is 5-20 min, the power supply can fix the time and automatically change the phase, and the phase change time is 30-120 min.
Optionally, the filler in the sand filter device may be quartz sand, coke or anthracite.
Meanwhile, the invention provides a lead-zinc industrial beneficiation wastewater treatment method based on the lead-zinc industrial beneficiation wastewater treatment device, which is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: introducing wastewater into the pretreatment tank and adjusting the pH of raw water to 6.5-9;
step two: discharging the produced water obtained in the step one into the sedimentation tank for preliminary sedimentation;
step three: introducing the supernatant obtained in the step two into the catalytic oxidation denitrification device, firstly adding a corresponding amount of catalyst into the catalytic oxidation denitrification device through the catalyst adding device, then starting the ozone generator to introduce ozone into water, and removing most organic matters in the wastewater by the cooperation of the catalyst and the ozone; the ozone tail gas is discharged after being purified by the ozone destructor;
step four: and discharging the wastewater obtained in the third step into the electrochemical device, removing a small amount of organic matters, arsenic, cadmium and other heavy metals in the wastewater through electrochemical reaction, scraping the floating flocculated sludge by the deslagging device, then refluxing the floating flocculated sludge into the sedimentation tank to be co-precipitated with the raw water, and simultaneously realizing coagulation pretreatment on the raw water.
Optionally, in the first step, a dosing device is connected above the pretreatment tank, and the dosed medicament is one of sodium carbonate, sodium bicarbonate, calcium oxide or sodium hydroxide to adjust the pH of the raw water to 6.5-9, and simultaneously, part of heavy metals in the wastewater can be removed by precipitation.
Optionally, a sludge discharge port at the bottom of the sedimentation tank is connected with a sludge dewatering machine, a sludge outlet of the sludge dewatering machine is connected with a sludge hopper, and the sludge dewatering machine is connected with the pretreatment tank through a filtrate return pipe; and the bottom sludge is discharged into the sludge hopper after being dehydrated by the sludge dehydrator and is periodically transported and buried outside, and filtrate generated by the sludge dehydrator flows back to the pretreatment tank.
Compared with the prior art, the invention has the following technical effects:
in the device and the method for treating the lead-zinc industrial mineral processing wastewater, the mineral processing wastewater is treated by a pretreatment tank and then discharged into a sedimentation tank to settle large-particle-size solids, the supernatant of the sedimentation tank flows through a catalytic oxidation denitrification device to remove most organic matters, and the treated wastewater is discharged into an electrochemical device to remove most heavy metal pollutants and residual trace organic matters in the water; the floating sludge produced by the electrochemical device is scraped by the deslagging device and then discharged into the sand filtering device for deep filtration, and the filtrate can be discharged or recycled for the mineral separation process. According to the invention, through the multistage advanced treatment of the catalytic oxidation denitrification device, the electrochemical device and the sand filtration device, organic matters and heavy metals in the wastewater can be completely removed, the quality of effluent water is stable and reaches the III-type emission standard in the surface water environmental quality standard, the problems of low (ammonia) nitride removal rate, complex medicament adding type and large adding amount in the wastewater in the conventional beneficiation wastewater treatment process are solved, the pretreatment tank only needs to adjust the pH value, no additional medicament is required to be added, the operation cost is reduced, the practicability is high, and the method has important significance for the upgrading and reconstruction of the existing beneficiation industry.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic structural diagram of a lead-zinc industrial beneficiation wastewater treatment device of the present invention;
FIG. 2 is a process flow diagram of the lead-zinc industrial beneficiation wastewater treatment apparatus of the present invention;
wherein the reference numerals are: 1. a pretreatment tank; 2. a dosing device; 3. a sedimentation tank; 4. a sludge dewatering machine; 5. a sludge hopper; 6. a catalytic oxidation denitrification device; 7. an ozone generating device; 8. an ozone destruction device; 9. a catalyst feeding device; 10. an electrochemical device; 11. a deslagging device; 12. a sand filtering device.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a lead-zinc industrial mineral processing wastewater treatment device and a treatment method, which can reduce the operation cost on the premise of ensuring that heavy metal, COD (chemical oxygen demand), ammonia nitrogen and total nitrogen in treated effluent all reach the standard.
Based on the technical scheme, the invention provides a lead-zinc industrial mineral processing wastewater treatment device, which comprises a pretreatment tank, a sedimentation tank, a catalytic oxidation denitrification device, an electrochemical device and a sand filtration device which are connected in sequence; the gas inlet of the catalytic oxidation denitrification device is connected with an ozone generating device, the gas outlet of the catalytic oxidation denitrification device is connected with an ozone destroying device, and the top end of the catalytic oxidation denitrification device is provided with a dosing port connected with a catalyst dosing device; the water outlet of the sand filtering device is connected with a water outlet discharge port; the electrochemical device is connected with a deslagging device communicated with the horizontal liquid level in the electrochemical device, and the deslagging device is connected with the sedimentation tank through a sludge return pipe.
Meanwhile, the invention provides a lead-zinc industrial beneficiation wastewater treatment method based on the lead-zinc industrial beneficiation wastewater treatment device, which comprises the following steps:
the method comprises the following steps: introducing wastewater into the pretreatment tank and adjusting the pH of raw water to 6.5-9;
step two: discharging the produced water obtained in the step one into the sedimentation tank for preliminary sedimentation;
step three: introducing the supernatant obtained in the step two into the catalytic oxidation denitrification device, firstly adding a corresponding amount of catalyst into the catalytic oxidation denitrification device through the catalyst adding device, then starting the ozone generator to introduce ozone into water, and removing most organic matters in the wastewater by the cooperation of the catalyst and the ozone; the ozone tail gas is discharged after being purified by the ozone destructor;
step four: and discharging the wastewater obtained in the third step into the electrochemical device, removing a small amount of organic matters, arsenic, cadmium and other heavy metals in the wastewater through electrochemical reaction, scraping the floating flocculated sludge by the deslagging device, then refluxing the floating flocculated sludge into the sedimentation tank to be co-precipitated with the raw water, and simultaneously realizing coagulation pretreatment on the raw water.
In the device and the method for treating the lead-zinc industrial mineral processing wastewater, the mineral processing wastewater is treated by a pretreatment tank and then discharged into a sedimentation tank to settle large-particle-size solids, the supernatant of the sedimentation tank flows through a catalytic oxidation denitrification device to remove most organic matters, and the treated wastewater is discharged into an electrochemical device to remove most heavy metal pollutants and residual trace organic matters in the water; the floating sludge produced by the electrochemical device is scraped by the deslagging device and then discharged into the sand filtering device for deep filtration, and the filtrate can be discharged or recycled for the mineral separation process. According to the invention, through the multistage advanced treatment of the catalytic oxidation denitrification device, the electrochemical device and the sand filtration device, organic matters and heavy metals in the wastewater can be completely removed, the quality of effluent water is stable and reaches the III-type emission standard in the surface water environmental quality standard, the problems of low (ammonia) nitride removal rate, complex medicament adding type and large adding amount in the wastewater in the conventional beneficiation wastewater treatment process are solved, the pretreatment tank only needs to adjust the pH value, no additional medicament is required to be added, the operation cost is reduced, the practicability is high, and the method has important significance for the upgrading and reconstruction of the existing beneficiation industry.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The first embodiment is as follows:
as shown in fig. 1-2, the embodiment provides a lead-zinc industrial mineral processing wastewater treatment device, which includes a pretreatment tank 1, a sedimentation tank 3, a catalytic oxidation denitrification device 6, an electrochemical device 10, and a sand filtration device 12, which are connected in sequence; an air inlet of the catalytic oxidation denitrification device 6 is connected with an ozone generating device 7, an air outlet of the catalytic oxidation denitrification device 6 is connected with an ozone destroying device 8, and the top end of the catalytic oxidation denitrification device 6 is provided with a dosing port connected with a catalyst dosing device 9; the water outlet of the sand filtering device 12 is connected with a water outlet discharge port; the electrochemical device 10 is connected with a deslagging device 11 communicated with the horizontal liquid level in the electrochemical device 10, and the deslagging device 11 is connected with the sedimentation tank through a sludge return pipe.
In the embodiment, as shown in fig. 1-2, a sludge discharge port at the bottom of the sedimentation tank 3 is connected with a sludge dewatering machine 4, a sludge outlet of the sludge dewatering machine 4 is connected with a sludge hopper 5, and the sludge dewatering machine 4 is connected with the pretreatment tank 1 through a filtrate return pipe. Wherein the surface load of the sedimentation tank 3 is 0.5-3 m3/m2H, the hydraulic retention time is 40-360 min.
In this embodiment, as shown in fig. 1-2, the agent added by the catalyst adding device 9 is sodium hypochlorite or chlorine dioxide. In this embodiment, preferably, the agent added by the catalyst adding device 9 is sodium hypochlorite, and the mass ratio of the added agent to (ammonia) nitride in the wastewater is controlled to be 10-50: 1.
In this embodiment, as shown in fig. 1-2, a dosing device 2 is connected above the pretreatment tank 1, and the dosed agent is one of sodium carbonate, sodium bicarbonate, calcium oxide, or sodium hydroxide. In this embodiment, the preferable agent added by the medicine adding device 2 is sodium carbonate or sodium hydroxide to adjust the pH of the raw water to 6.5-9. Moreover, the pretreatment tank 1 only needs to adjust the pH value, and no additional medicament is needed, so that the medicament cost can be reduced by more than 50%.
In the embodiment, as shown in FIGS. 1 to 2, the ozone adding amount of the catalytic oxidation denitrification device 6 is preferably 20 to 80g/h, and the ozone oxidation reaction time is 10 to 30 min; the ozone off-gas is purified by an ozone destruction device 8. When the catalytic oxidation denitrification device 6 operates, the catalyst can catalyze ozone to generate hydroxyl radicals in water, so that the removal effect on COD is improved; the ozone can be cooperated with a catalyst to oxidize ammonia (nitrogen) compounds in water, so that the removal effect of ammonia nitrogen and total nitrogen is improved, and the complete removal of organic matters in the mineral processing wastewater is realized.
In this embodiment, as shown in fig. 1-2, the electrochemical device 10 is provided with a pure aluminum electrode group and a power supply connected to the pure aluminum electrode group; the electrode distance between the cathode and the anode in the pure aluminum electrode group is 10-30 mm, and the current density is 20-50A/m2The electrochemical hydraulic retention time is 5-20 min, and the power supply can fix the time and automatically change the phase, wherein the phase change time is 30-120 min. By adopting an automatic phase-changing power supply, the cathode and the anode are automatically reversed after reacting for a certain time, so that the uniform oxidation of the cathode and the anode plates is realized; the catalytic oxidation denitrification and electrochemical process can enable the ozone-containing wastewater to flow through the surface of the electrode plate and continuously oxidize the electrode plate; the two polar plate oxidation modes are combined, so that the phenomenon of polar plate passivation can be basically avoided, and the utilization rate of the polar plate is maximized.
In this embodiment, as shown in fig. 1-2, the filler in the sand filter 12 may be quartz sand, coke or anthracite. In the present embodiment, the sand filter 12 is preferably made of quartz sand.
In this embodiment, the deslagging device 11 is preferably made of stainless steel; and the deslagging device 11 is preferably positioned 10-30 mm below the horizontal liquid level of the electrochemical device 10. The floating flocculation sludge generated by electrochemistry is scraped by the deslagging device 11 and then flows back to the sedimentation tank 3, so that the coagulation pretreatment of the inlet water and the sedimentation discharge of most of the sludge in the electrochemical device 10 at the front end sedimentation tank 3 can be realized simultaneously.
The following is to the bookThe embodiment specifically describes a lead-zinc industrial beneficiation wastewater treatment method corresponding to the lead-zinc industrial beneficiation wastewater treatment device. Wherein the control parameters are as follows: the inlet water flow of the waste water of a certain lead-zinc concentrating mill is preferably 600m3D, in the dosing device 2, the dosage concentration of the sodium carbonate is 20 percent; the settling tank 3 is kept for 80min by water power; the adding amount of ozone of the catalytic oxidation denitrification device 6 is 40g/h, the concentration of sodium hypochlorite is 10 percent, and the mass ratio of the adding amount of the sodium hypochlorite to the (ammonia) nitride in the water is 23: 1; the distance between the anode and the cathode of the electrochemical device 10 is 10mm, and the current density is 20A/m2The hydraulic power flow stopping time is 8 min; the phase change time was 90 min.
The water quality of the inlet water is shown in the following table 1:
TABLE 1 wastewater quality (mg/L)
| Index of water quality | COD | NH3-N | TN | Cu | Zn | Cd | As | Pb |
| Content (wt.) | 363 | 15.4 | 24.8 | 2.56 | 11.5 | 0.04 | 1.44 | 16.1 |
The method for treating the lead-zinc industrial mineral processing wastewater mainly comprises the following steps:
the method comprises the following steps: introducing the wastewater into a pretreatment tank 1, adding sodium carbonate into a reaction tank through a dosing device 2, and adjusting the pH value to 6.5-9;
step two: the produced water obtained in the first step enters a sedimentation tank 3 for preliminary sedimentation, the bottom sludge is discharged into a sludge hopper 5 and is periodically transported and buried outside after being dewatered by a sludge dewatering machine 4, and the filtrate generated by the sludge dewatering machine 4 flows back to a pretreatment tank 1;
step three: introducing the supernatant obtained in the second step into a catalytic oxidation denitrification device 6, adding a certain amount of sodium hypochlorite into the reactor through a catalyst adding device 9, starting an ozone generating device 7 to introduce ozone into water, and introducing ozone tail gas into an ozone destructor 8 for purification;
step four: the wastewater obtained in the third step enters an electrochemical device 10, a small amount of organic matters, arsenic, cadmium and other small amount of heavy metals in the wastewater are removed through electrochemical reaction, and floating flocculation sludge is scraped by a deslagging device 11 and then flows back to a sedimentation tank 3 to be coprecipitated with raw water; the obtained effluent is introduced into a sand filter 12, and the produced water after deep filtration can be directly discharged or recycled for the mineral separation process.
The treatment effect is as follows:
the effluent of the pretreatment tank, the effluent of the catalytic oxidation denitrification device, the effluent of the electrochemical device and the effluent of the sand filtration device are monitored, and the measurement results are shown in the following table 2. As can be seen from Table 2, the effluent of the sand filtration device of the example is lower than the class III standard limit in the Standard for quality of Water on the surface (GB 3838-2002).
TABLE 2 treatment Effect (mg/L)
Therefore, in the embodiment, by adopting the multistage advanced treatment of the catalytic oxidation denitrification device, the electrochemical device and the sand filtration device, organic matters and heavy metals in wastewater can be completely removed, the quality of effluent water is stable and reaches the III-type emission standard in the surface water environmental quality standard, the problems of low removal rate of (ammonia) nitrides in wastewater, complex medicament adding type and large adding amount in the conventional beneficiation wastewater treatment process are solved, the pretreatment tank only needs to adjust pH, no additional medicament needs to be added, the operation cost is reduced, the practicability is high, the conventional beneficiation wastewater treatment process system can be conveniently accessed, and the important significance is realized on the upgrading and transformation of the conventional beneficiation industry.
Example two:
the embodiment provides another method for treating lead-zinc industrial beneficiation wastewater. Wherein the control parameters are as follows: the inlet water flow of the wastewater of a certain lead-zinc concentrating mill is preferably 1000m3D, in the dosing device 2, the dosage concentration of the sodium carbonate is 20 percent; the settling tank 3 is kept for 120min by water power; the adding amount of ozone of the catalytic oxidation denitrification device 6 is 25g/h, the concentration of sodium hypochlorite is 10 percent, and the mass ratio of the adding amount of the sodium hypochlorite to (ammonia) nitride in water is 12: 1; the distance between the anode and the cathode of the electrochemical device 10 is 10mm, and the current density is 20A/m2The hydraulic power flow stopping time is 8 min; the phase change time was 90 min. The inlet water quality is shown in the following table 3:
TABLE 3 wastewater quality (mg/L)
| Index of water quality | COD | NH3-N | TN | Cu | Zn | Cd | As | Pb |
| Content (wt.) | 124.5 | 7.6 | 10.88 | 5.64 | 83.3 | 0.02 | 2.90 | 48.7 |
The method for treating the lead-zinc industrial mineral processing wastewater mainly comprises the following steps:
the method comprises the following steps: introducing the wastewater into a pretreatment tank 1, adding sodium carbonate into a reaction tank through a dosing device 2, and adjusting the pH value to 6.5-9;
step two: the produced water obtained in the first step enters a sedimentation tank 3 for preliminary sedimentation, the bottom sludge is discharged into a sludge hopper 5 and is periodically transported and buried outside after being dewatered by a sludge dewatering machine 4, and the filtrate generated by the sludge dewatering machine 4 flows back to a pretreatment tank 1;
step three: introducing the supernatant obtained in the second step into a catalytic oxidation denitrification device 6, adding a certain amount of sodium hypochlorite into the reactor through a catalyst adding device 9, starting an ozone generating device 7 to introduce ozone into water, and introducing ozone tail gas into an ozone destructor 8 for purification;
step four: the wastewater obtained in the third step enters an electrochemical device 10, a small amount of organic matters, arsenic, cadmium and other small amount of heavy metals in the wastewater are removed through electrochemical reaction, and floating flocculation sludge is scraped by a deslagging device 11 and then flows back to a sedimentation tank 3 to be coprecipitated with raw water; the obtained effluent is introduced into a sand filter 12, and the produced water after deep filtration can be directly discharged or recycled for the mineral separation process.
The treatment effect is as follows:
the effluent of the pretreatment tank, the effluent of the catalytic oxidation denitrification device, the effluent of the electrochemical device and the effluent of the sand filtration device are monitored, and the measurement results are shown in the following table 4. As can be seen from Table 4, the effluent of the sand filtration device of the embodiment is lower than the class III standard limit in the Standard for quality of Water on the surface (GB 3838-2002).
TABLE 4 treatment Effect (mg/L)
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. The utility model provides a lead zinc industry ore dressing effluent treatment plant which characterized in that: comprises a pretreatment tank, a sedimentation tank, a catalytic oxidation denitrification device, an electrochemical device and a sand filtration device which are connected in sequence; the gas inlet of the catalytic oxidation denitrification device is connected with an ozone generating device, the gas outlet of the catalytic oxidation denitrification device is connected with an ozone destroying device, and the top end of the catalytic oxidation denitrification device is provided with a dosing port connected with a catalyst dosing device; the water outlet of the sand filtering device is connected with a water outlet discharge port; the electrochemical device is connected with a deslagging device communicated with the horizontal liquid level in the electrochemical device, and the deslagging device is connected with the sedimentation tank through a sludge return pipe.
2. The lead-zinc industrial mineral processing wastewater treatment device according to claim 1, characterized in that: the bottom mud discharging port of the sedimentation tank is connected with a sludge dewatering machine, the mud outlet of the sludge dewatering machine is connected with a sludge hopper, and the sludge dewatering machine is connected with the pretreatment tank through a filtrate return pipe.
3. The lead-zinc industrial mineral processing wastewater treatment device according to claim 1, characterized in that: the agent added by the catalyst adding device is sodium hypochlorite or chlorine dioxide.
4. The lead-zinc industrial mineral processing wastewater treatment device according to claim 1, characterized in that: the upper part of the pretreatment tank is connected with a dosing device, and the dosed medicament is one of sodium carbonate, sodium bicarbonate, calcium oxide or sodium hydroxide.
5. The lead-zinc industrial mineral processing wastewater treatment device according to claim 1, characterized in that: the ozone adding amount of the catalytic oxidation denitrification device is 20-80 g/h; the tail gas is purified by the ozone destruction device.
6. The lead zincifier of claim 1Industry ore dressing effluent treatment plant, its characterized in that: the electrochemical device is provided with a pure aluminum electrode group and a power supply connected with the pure aluminum electrode group; the inter-electrode distance between the cathode and the anode in the pure aluminum electrode group is 10-30 mm, and the current density is 20-50A/m2The electrochemical hydraulic retention time is 5-20 min, the power supply can fix the time and automatically change the phase, and the phase change time is 30-120 min.
7. The lead-zinc industrial mineral processing wastewater treatment device according to claim 1, characterized in that: the filler in the sand filter device can be quartz sand, coke or anthracite.
8. A lead-zinc industrial beneficiation wastewater treatment method based on the lead-zinc industrial beneficiation wastewater treatment apparatus according to any one of claims 1 to 7, characterized in that: the method comprises the following steps:
the method comprises the following steps: introducing wastewater into the pretreatment tank and adjusting the pH of raw water to 6.5-9;
step two: discharging the produced water obtained in the step one into the sedimentation tank for preliminary sedimentation;
step three: introducing the supernatant obtained in the step two into the catalytic oxidation denitrification device, firstly adding a corresponding amount of catalyst into the catalytic oxidation denitrification device through the catalyst adding device, then starting the ozone generator to introduce ozone into water, and removing most organic matters in the wastewater by the cooperation of the catalyst and the ozone; the ozone tail gas is discharged after being purified by the ozone destructor;
step four: and discharging the wastewater obtained in the third step into the electrochemical device, removing a small amount of organic matters, arsenic, cadmium and other heavy metals in the wastewater through electrochemical reaction, scraping the floating flocculated sludge by the deslagging device, then refluxing the floating flocculated sludge into the sedimentation tank to be co-precipitated with the raw water, and simultaneously realizing coagulation pretreatment on the raw water.
9. The lead-zinc industrial beneficiation wastewater treatment method according to claim 8, characterized in that: in the first step, a dosing device is connected above the pretreatment tank, and the dosed medicament is one of sodium carbonate, sodium bicarbonate, calcium oxide or sodium hydroxide so as to adjust the pH of raw water to 6.5-9 and simultaneously precipitate and remove part of heavy metals in the wastewater.
10. The lead-zinc industrial beneficiation wastewater treatment method according to claim 8, characterized in that: a sludge discharge port at the bottom of the sedimentation tank is connected with a sludge dewatering machine, a sludge outlet of the sludge dewatering machine is connected with a sludge hopper, and the sludge dewatering machine is connected with the pretreatment tank through a filtrate return pipe; and the bottom sludge is discharged into the sludge hopper after being dehydrated by the sludge dehydrator and is periodically transported and buried outside, and filtrate generated by the sludge dehydrator flows back to the pretreatment tank.
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