A method for deep treatment and resource utilization of lead-zinc beneficiation wastewater based on biological reduction

Abstract

The application discloses a kind of based on biological reduction's lead-zinc ore-dressing wastewater advanced treatment and resource method, belong to ore-dressing wastewater treatment technical field, this method includes the following steps: lead-zinc ore-dressing wastewater is in turn through flocculation and CO2 hardness reduction pretreatment, biological electrochemistry system removes heavy metal, COD and produces methanol, advanced oxidation removes COD in depth, iron and sulphate are removed by neutralization and precipitation to obtain treated water, and the water-containing iron mud is used for advanced oxidation after being treated by dissimilatory iron reduction.The application can realize the recycling of CO2 and iron resources, deeply remove COD, heavy metals in wastewater, and significantly reduce hardness and sulfate, and the treated water can be fully reused to the ore-dressing process or discharged up to standard.

Description

Technical Field

[0001] This invention belongs to the field of metallurgy and chemical engineering, specifically relating to a method for the deep treatment and resource utilization of lead-zinc ore beneficiation wastewater based on biological reduction. Background Technology

[0002] Lead-zinc ore beneficiation wastewater contains suspended solids, COD, and SO4. 2- The wastewater is characterized by high concentration, high hardness, and the presence of heavy metals (Pb, Zn, Tl, etc.). Currently, the main methods for COD treatment of mineral processing wastewater are advanced oxidation technologies such as Fenton oxidation and ozone oxidation. However, Fenton oxidation technology has drawbacks such as high iron sludge production, low oxidation efficiency, and potential waste of iron resources. Wastewater hardness reduction methods mainly include chemical precipitation and CO2 hardening. CO2 hardening is highly efficient but can increase carbon emissions. Heavy metal treatment methods mainly include coagulation sedimentation and chemical precipitation. After sedimentation treatment, the sludge production is large and the pollutant composition is complex. Conventional single sedimentation technologies have low removal rates for thallium in wastewater, making it difficult to meet discharge standards.

[0003] Bioreduction technology utilizes microbial metabolism; while degrading organic matter, specific functional bacteria can also reduce SO4. 2- Fe 3+ CO2, forming S 2- Fe 2+ and low-carbon organic compounds (methanol, methane, etc.), of which S 2- It can remove heavy metal ions from wastewater through sulfide precipitation, Fe 3+ CO2 reduction enables the recycling of iron and carbon resources, representing a green water treatment technology. Microbial electrolysis systems, under applied voltage, significantly enhance the biological reduction process with low energy consumption, demonstrating strong application potential. Lead-zinc ore beneficiation wastewater contains large amounts of organic matter and SO4. 2- Furthermore, the Fenton oxidation method for removing COD produces a large amount of Fe-containing compounds. 3+ Sludge provides natural reaction conditions for bioreduction. Therefore, developing a bioreduction-based method for the advanced treatment and resource recovery of lead-zinc ore beneficiation wastewater is of great significance for reducing iron resource waste and lowering carbon emissions. Summary of the Invention

[0004] The purpose of this invention is to provide a method for the deep treatment and resource utilization of ascites water in mineral processing based on bioreduction.

[0005] The objective of this invention is achieved as follows: the method for advanced treatment and resource recovery of lead-zinc ore beneficiation wastewater based on bioreduction includes pretreatment, heavy metal removal, advanced oxidation, neutralization precipitation, and Fe... 3+ / Fe 2+ The recycling process specifically includes: A. Pretreatment: The lead-zinc ore beneficiation wastewater to be treated is pretreated by flocculation sedimentation and CO2 hardening, and then the pH value is adjusted to 6.5~7.5 to obtain pretreated wastewater a; B. Removal of heavy metals: Pretreated wastewater a is introduced into a bioelectrochemical system to degrade organic matter and precipitate heavy metals, yielding methanol b and wastewater c; C. Advanced oxidation: Adjust the pH of the wastewater to 3.4-3.6, and then... (The sentence is incomplete and requires more context to translate accurately.) 2+ Add hydrogen peroxide to the solution with 30% H2O2 at a volume ratio of 40~60:1, and carry out the Fenton reaction for 50~70 min to obtain oxidized wastewater d; D. Neutralization and precipitation: Add a precipitant to the oxidizing wastewater d for neutralization and precipitation to obtain water-containing iron sludge e and treated water. The treated water can be completely reused in the mineral processing process or discharged in compliance with standards. E, Fe 3+ / Fe 2+ Recycling: Water-containing iron sludge e is added to the dissimilar iron reduction system. Dissimilar iron reducing bacteria use methanol b as a carbon source, and under the action of these bacteria, the insoluble Fe in the iron sludge is reduced. 3+ Converted to Fe 2+ , producing Fe 2+ Treating water and CO2, containing Fe 2+ The treated water is used for the Fenton reaction in step C, and the generated CO2 is collected and used in step A.

[0006] The specific steps are as follows: (1) The lead-zinc ore beneficiation wastewater is subjected to flocculation sedimentation and CO2 de-hardening pretreatment. After adjusting the pH of the wastewater to 7.0, pretreated wastewater is obtained. The overflowing CO2 is collected and used in step (2). The flocculation sedimentation agents are PAC and PAM. The dosage of PAC is 100~300 mg / L and the dosage of PAM is 5~20 mg / L. The CO2 de-hardening method is pressurized dissolved air aeration with a pressure range of 0.2~0.6 MPa and a CO2 dosage of 0.8 g / L~2 g / L.

[0007] (2) The wastewater generated in step (1) is introduced into a bioelectrochemical system for organic matter degradation and heavy metal precipitation. The resulting methanol is used in step (5). The cathode potential of the bioelectrochemical system is maintained at -0.6V to -1.6V, and the residence time is 8 to 16 hours. The bioelectrochemical system is a microbial electrolysis cell, with the structure as follows: Figure 2 As shown, the mixture consists of cathode chamber 1 and cathode chamber 2 separated by a proton exchange membrane, and a mixing chamber composed of anode and cathode 3. Cathode chamber 1 and cathode chamber 2 are fed with CO2 overflowing from step (1) and CO2 generated in step (5). Methanol is produced by reducing CO2 to methanol by methanol-producing bacteria. The pretreated wastewater from step (1) flows into the mixing chamber, where SO4 is reduced by heavy metal sulfate-resistant bacteria. 2-The generated S 2- Heavy metals (such as Pb) can be precipitated. 2+ Zn 2+ (etc.), while simultaneously mixing with indoor microorganisms to degrade organic matter in wastewater; both the cathode and anode materials are carbon-based materials; the methanol-producing bacteria and heavy metal sulfate-reducing bacteria are dominant strains screened by computer-aided bacterial screening technology.

[0008] (3) The wastewater generated in step (2) is subjected to advanced oxidation to remove COD, further degrading organic matter, and at the same time, the Tl in the wastewater is removed. + Oxidized to Tl 3+ Among them, the advanced oxidation method is the Fenton process. For the first run, FeSO4 needs to be added to start the iron cycle, and then the Fe-containing iron produced in step (5) is added... 2+ Adding 50 mg / L FeSO4 to the treated water forms a Fe-containing... 2+ The solution is used for the subsequent Fenton reaction; the reaction conditions are: adjusting the pH of the wastewater to be treated to 3.5 with sulfuric acid, containing Fe... 2+ The solution dosage is 50~200 ml / L of wastewater, based on the Fe content. 2+ The solution was mixed with 30% H2O2 at a volume ratio of 50:1 to start the reaction, which took 60 minutes.

[0009] (4) Neutralize and precipitate the wastewater generated in step (3) to remove iron, sulfate and thiocyanate. 3+ The process yields unfiltered, water-containing iron sludge and treated water, all of which is reused in the mineral processing stage or discharged in compliance with standards. The neutralizing and precipitating agent is Ba(OH)2, and the pH of the wastewater is adjusted to 8.0.

[0010] (5) Add the water-containing iron sludge produced in step (4) to the dissimilar iron reduction system. The dissimilar iron reducing bacteria use the methanol produced in step (2) as a carbon source. Under the action of the dissimilar iron reducing bacteria, the insoluble Fe in the iron sludge is reduced. 3+ Converted to Fe 2+ , producing Fe 2+ Treating water and CO2, containing Fe 2+ The treated water is used for the Fenton reaction in step (3), and the generated CO2 is collected and used for methanol production in step (2). The dissimilar iron reduction reactor is an upflow anaerobic sludge bed with a reactor temperature of 35°C and a pH of 7.0. In step (2), the methanol-containing solution is added at a rate of 100-500 ml / L of water-containing iron sludge, with a residence time of 12-18 h. CO2 is collected by a three-phase separator in the upflow anaerobic sludge bed. The dissimilar iron reducing bacteria are dominant strains selected using computer-aided bacterial screening technology.

[0011] The technical principle of this invention is as follows: (1) Bioreduction: Sulfate-reducing bacteria (SRB) under anaerobic conditions use sulfate (SO4) to reduce sulfate (SO4) to form sulfate (SO4) and ... and reduce sulfate (SO4) to form sulfate (SO4) and reduce sulfate (SO4) and reduce 2- (APS) acts as an electron acceptor, converting SO42- into electrons through enzyme-catalyzed reactions (such as APS reductase and ATP sulfatase). 2- Gradually reduced to sulfides (S 2- (or H2S), in this process, SRB uses organic matter as an electron donor to complete energy metabolism, generating S 2- With heavy metal ions in wastewater (such as Pb) 2+ Zn 2+ 、Tl + (etc.) combine to form insoluble metal sulfide precipitates, enabling the simultaneous removal of organic matter and heavy metals. Methanol-producing bacteria utilize CO2 and H2 produced at the anode to form insoluble metal sulfide precipitates, achieving simultaneous removal of organic matter and heavy metals. + With the assistance of electrons provided by an external circuit and biological enzymes, CO2 is reduced to methanol. Methanol can serve as a carbon source for microbial growth, thus achieving the recycling of carbon resources. Under anaerobic conditions, dissimilatory iron-reducing bacteria release electrons by oxidizing organic matter. Through dissimilatory reduction mechanisms (direct contact, electron shuttle, chelation solubilization, etc.), they reduce Fe2+ in sparingly soluble trivalent iron compounds (such as ferric hydroxide) to form Fe2+. 3+ As an electron acceptor, it is reduced to Fe. 2+ When used in conjunction with Fenton technology, it can achieve the recycling of iron.

[0012] (2) COD gradient removal: Organic matter in lead-zinc ore beneficiation wastewater mainly originates from the residues of beneficiation reagents, which are difficult to remove. For example, xanthates are easily soluble in water and have a stable molecular structure, making traditional coagulation methods almost ineffective against them. Black dyes contain benzene rings and thioether bonds, and have strong resistance to degradation. By partially decomposing recalcitrant organic matter through biological oxidation and improving the degradation efficiency of advanced oxidation steps, the gradient degradation of recalcitrant organic matter in wastewater can be achieved, resulting in a high removal rate.

[0013] (3) Two-step precipitation to remove thallium: Tl exists in lead-zinc beneficiation wastewater + and Tl 3+ But mainly Tl + Mainly, most of the Tl in the wastewater + First, Tl₂S is precipitated and removed in the bioelectrochemical system, then the residual Tl in the wastewater is removed. + Tl is generated through an advanced oxidation step. 3+ The precipitate is further removed by neutralization to form Tl(OH)3.

[0014] The technical advantages of this invention are: (1) CO2 resource recycling: The specific methanol-producing bacteria reduction system uses CO2 to produce methanol and serves as the carbon source for the heterogeneous iron reduction system, which can realize the recycling of CO2 resources and significantly reduce carbon emissions.

[0015] (2) Iron resource recycling: Through the synergistic effect of dissimilar iron reduction and Fenton oxidation, a "Fe 2+ →Fenton oxidation→Fe 3+ →Iron-reducing bacteria→Fe 2+ The closed-loop circulation path reduces the amount of ferrous sulfate purchased and the amount of iron sludge precipitate produced compared to the traditional Fenton process, thus significantly reducing operating costs.

[0016] (3) COD cascade degradation and synergistic removal of pollutants: Through the combined use of biological oxidation, advanced oxidation and chemical precipitation technologies, deep synergistic removal of COD and thallium in mineral processing wastewater can be achieved. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the process flow of the present invention; Figure 2 This is a schematic diagram of the microbial electrolysis cell structure described in this invention. Detailed Implementation

[0018] The present invention will be further described below with reference to embodiments, but this is not intended to limit the present invention in any way. Any modifications or substitutions made based on the teachings of the present invention shall fall within the protection scope of the present invention.

[0019] The method for advanced treatment and resource utilization of lead-zinc ore beneficiation wastewater based on bioreduction described in this invention includes pretreatment, heavy metal removal, advanced oxidation, neutralization precipitation, and posttreatment steps, specifically including: A. Pretreatment: The lead-zinc ore beneficiation wastewater to be treated is pretreated by flocculation sedimentation and CO2 hardening, and then the pH value is adjusted to 6.5~7.5 to obtain pretreated wastewater a; B. Removal of heavy metals: Pretreated wastewater a is introduced into a bioelectrochemical system for organic matter degradation and heavy metal precipitation to obtain methanol solution b and wastewater c; C. Advanced oxidation: Adjust the pH of the wastewater to 3.4-3.6, and then... (The sentence is incomplete and requires more context to translate accurately.) 2+ The solution was mixed with 30% H2O2 at a volume ratio of 40~60:1 and hydrogen peroxide was added. The Fenton reaction was carried out for 50~70 min to obtain oxidized wastewater d. D. Neutralization and precipitation: Add a precipitant to the oxidized wastewater d for neutralization and precipitation to obtain water-containing iron sludge e and treated water. The treated water can be completely reused in the mineral processing process or discharged in compliance with standards. E. Post-treatment: The hydrous iron sludge e is added to the dissimilar iron reduction system. The dissimilar iron reducing bacteria use methanol solution b as a carbon source, and under the action of the dissimilar reduction mechanism, the insoluble Fe in the iron sludge is reduced. 3+ Converted to Fe 2+ , producing Fe 2+ Treating water and CO2, containing Fe2+ The treated water is used for the Fenton reaction in step C, and the generated CO2 is collected and used in step A.

[0020] The flocculants used for flocculation and precipitation in step A are PAC and PAM.

[0021] The mass ratio of PAC to PAM is (5~60):1.

[0022] The CO2 hardening process described in step A involves pressurized dissolved gas aeration with a pressure range of 0.2~0.6MPa and a carbon dioxide dosage of 0.8~2g / L.

[0023] The bioelectrochemical system described in step B is a microbial electrolytic cell, which consists of a cathode chamber 1 and a cathode chamber 2 separated by a proton exchange membrane, and a mixed chamber composed of an anode and a cathode 3.

[0024] The cathode potential of the bioelectrochemical system is maintained at -0.6 to 1.6 V, and the residence time is 8 to 16 hours.

[0025] The reaction conditions in step C are as follows: the pH of wastewater c is adjusted to 3.5 with sulfuric acid, and it contains Fe. 2+ The solution dosage is 50~200 ml / L of wastewater, based on the Fe content. 2+ The solution was mixed with 30% H2O2 at a volume ratio of 50:1 to start the reaction, which took 60 minutes.

[0026] The precipitant mentioned in step D is Ba(OH)2.

[0027] In step E, the dissimilar iron reduction reactor is an upflow anaerobic sludge bed reactor with a reactor temperature of 34~36℃ and a pH of 6.5~7.5.

[0028] The invention will be further illustrated below with specific implementation examples:

[0029] The water quality parameters of the lead-zinc ore beneficiation wastewater used in the following examples are: COD=250 mg / L, sulfate=1824 mg / L, total hardness=1800 mg / L, lead=2.65 mg / L, zinc=8.74 mg / L, thallium=0.05 mg / L.

[0030] Example 1

[0031] ① Add 100 mg / L PAC and 5 mg / L PAM to lead-zinc ore beneficiation wastewater, stir and react, then precipitate and separate. Then, under dissolved gas pressure of 0.2 MPa and CO2 dosage of 0.8 g / L, perform carbon dioxide dehardening, and finally adjust the wastewater pH to 7; ② Introduce the wastewater and CO2 generated in steps ① and ⑤ into a bioelectrochemical system, maintaining a cathode potential of -0.6V, and react for 8 hours; ③ Introduce Fe-containing... 2+ Adding 50 mg / L FeSO4 to the treated water forms a Fe-containing... 2+ The solution was prepared by adjusting the pH of the wastewater to 3.5 with sulfuric acid, and then adding 50 ml / L of Fe... 2+ ④ The solution and 1 ml / L H2O2 were used for oxidation reaction for 60 min; ⑤ The pH of the wastewater was adjusted to 8 with Ba(OH)2, and after precipitation and separation, water-containing iron sludge and treated water were obtained; ⑥ The water-containing iron sludge was added to the dissimilar iron reduction system, and 100 ml / L methanol-containing wastewater generated in step ② was added as a carbon source. The reactor temperature was controlled at 35℃ and the pH at 7. The reaction was carried out for 12 h to obtain Fe-containing iron sludge. 2+ Water treatment. The water quality parameters of lead-zinc ore beneficiation wastewater after treatment by this process are: COD=18 mg / L, sulfate=1094 mg / L, total hardness=94 mg / L, lead<0.07mg / L, zinc=0.026 mg / L, thallium=0.00046 mg / L.

[0032] Example 2

[0033] ① Add 300 mg / L PAC and 20 mg / L PAM to lead-zinc ore beneficiation wastewater, stir and react, then precipitate and separate. Then, under dissolved gas pressure of 0.6 MPa and CO2 dosage of 2 g / L, perform carbon dioxide dehardening. Finally, adjust the pH of the wastewater to 7; ② Introduce the wastewater and CO2 generated in steps ① and ⑤ into a bioelectrochemical system, maintaining a cathode potential of -1.6 V, and react for 16 hours; ③ Introduce Fe-containing... 2+ Adding 50 mg / L FeSO4 to the treated water forms a Fe-containing... 2+ The solution was prepared by adjusting the pH of the wastewater to 3.5 with sulfuric acid, and then adding 200 ml / L of a solution containing Fe. 2+ The solution and 4 ml / L H2O2 were used for oxidation reaction for 60 min; ④ The pH of the wastewater was adjusted to 8 with Ba(OH)2, and after precipitation and separation, water-containing iron sludge and treated water were obtained; ⑤ The water-containing iron sludge was added to the dissimilar iron reduction system, and 500 ml / L methanol-containing wastewater generated in step ② was added as a carbon source. The reactor temperature was controlled at 35℃ and the pH at 7, and the reaction was carried out for 18 h to obtain Fe-containing iron sludge. 2+Water treatment. The water quality parameters of lead-zinc ore beneficiation wastewater after treatment by this process are: COD=16 mg / L, sulfate=910 mg / L, total hardness=76 mg / L, lead<0.07mg / L, zinc=0.021 mg / L, thallium=0.00042 mg / L.

[0034] Example 3

[0035] ① Add 200 mg / L PAC and 10 mg / L PAM to lead-zinc ore beneficiation wastewater, stir and react, then precipitate and separate the precipitate. Then, under dissolved gas pressure of 0.4 MPa and CO2 dosage of 1.5 g / L, perform carbon dioxide dehardening, and finally adjust the pH of the wastewater to 7; ② Introduce the wastewater and CO2 generated in steps ① and ⑤ into a bioelectrochemical system, maintaining a cathode potential of -1.1 V, and react for 12 hours; ③ Introduce Fe-containing... 2+ Adding 50 mg / L FeSO4 to the treated water forms a Fe-containing... 2+ The solution was prepared by adjusting the pH of the wastewater to 3.5 with sulfuric acid, and then adding 100 ml / L of a solution containing Fe. 2+ ④ The solution and 2 ml / L H2O2 were used for oxidation reaction for 60 min; ⑤ The pH of the wastewater was adjusted to 8 with Ba(OH)2, and after precipitation and separation, water-containing iron sludge and treated water were obtained; ⑥ The water-containing iron sludge was added to the dissimilar iron reduction system, and 250 ml / L methanol-containing wastewater generated in step ② was added as a carbon source. The reactor temperature was controlled at 35℃ and the pH at 7. The reaction was carried out for 15 h to obtain Fe-containing iron sludge. 2+ Water treatment. The water quality parameters of lead-zinc ore beneficiation wastewater after treatment by this process are: COD=16 mg / L, sulfate=978 mg / L, total hardness=86 mg / L, lead<0.07mg / L, zinc=0.023 mg / L, thallium=0.00051 mg / L.

[0036] Example 4

[0037] ① Add 300 mg / L PAC and 20 mg / L PAM to lead-zinc ore beneficiation wastewater, stir and react to separate the precipitate, then perform carbon dioxide dehardening under dissolved gas pressure of 0.6 MPa and CO2 dosage of 2 g / L, and finally adjust the pH of the wastewater to 7; ② Introduce the wastewater and CO2 generated in steps ① and ⑤ into a bioelectrochemical system, maintain the cathode potential at -0.9 V, and react for 16 h; ③ Add Fe-containing... 2+ Adding 50 mg / L FeSO4 to the treated water forms a Fe-containing... 2+ The solution was prepared by adjusting the pH of the wastewater to 3.5 with sulfuric acid, and then adding 200 ml / L of a solution containing Fe. 2+The solution and 4 ml / L H2O2 were used for oxidation reaction for 60 min; ④ The pH of the wastewater was adjusted to 8 with Ba(OH)2, and after precipitation and separation, water-containing iron sludge and treated water were obtained; ⑤ The water-containing iron sludge was added to the dissimilar iron reduction system, and 500 ml / L methanol-containing wastewater generated in step ② was added as a carbon source. The reactor temperature was controlled at 35℃ and the pH at 7, and the reaction was carried out for 18 h to obtain Fe-containing iron sludge. 2+ Water treatment. The water quality parameters of lead-zinc ore beneficiation wastewater after treatment by this process are: COD < 16 mg / L, sulfate = 829 mg / L, total hardness = 77 mg / L, lead < 0.07 mg / L, zinc < 0.02 mg / L, thallium = 0.00034 mg / L.

[0038] The water quality treated in the above embodiments all meet the special emission concentration limits (direct discharge) of water pollutants in the "Emission Standard of Pollutants for Lead and Zinc Industry GB 25466-2010" and its amendments, indicating that the method can achieve deep treatment of lead and zinc beneficiation wastewater, as shown in the table below.

[0039] Table 1. Water Quality of Treated Water .

Claims

1. A method for deep treatment and resource utilization of lead-zinc ore beneficiation wastewater based on bioreduction, characterized in that, Includes the following steps: A. Pretreatment: The lead-zinc ore beneficiation wastewater to be treated is pretreated by flocculation sedimentation and CO2 hardening, and then the pH value is adjusted to 6.5~7.5 to obtain pretreated wastewater a; B. Heavy Metal Removal: Pretreated wastewater a is introduced into a bioelectrochemical system for organic matter degradation and heavy metal precipitation, yielding methanol b and wastewater c. The cathode potential of the bioelectrochemical system is maintained at -0.6V to -1.6V, with a residence time of 8 to 16 hours. The bioelectrochemical system is a microbial electrolysis cell, consisting of cathode chambers 1 and 2 separated by a proton exchange membrane, and a mixing chamber composed of an anode and a cathode 3. Cathode chambers 1 and 2 are irrigated with CO2 overflowing from step A and CO2 generated in step E, which is then reduced to methanol by methanol-producing bacteria. Pretreated wastewater a from step A flows into the mixing chamber, where SO4 is reduced by heavy metal sulfate-resistant bacteria. 2- The generated S 2- It can precipitate heavy metals and simultaneously mix with indoor microorganisms to degrade organic matter in wastewater; both the cathode and anode materials are carbon-based materials; the methanol-producing bacteria and heavy metal sulfate-reducing bacteria are dominant strains screened by computer-aided bacterial screening technology; C. Advanced oxidation: Adjust the pH of the wastewater to 3.5, and then... (The sentence is incomplete and requires more context to translate accurately.) 2+ The solution containing Fe was added to hydrogen peroxide at a volume ratio of 50:1 to 30% H2O2. 2+ The solution added was 50-200 ml / L of wastewater, and the reaction time was 60 min to obtain oxidized wastewater d. D. Neutralization and precipitation: Add a precipitant to the oxidizing wastewater d for neutralization and precipitation to obtain water-containing iron sludge e and treated water. The treated water can be completely reused in the mineral processing process or discharged in compliance with standards. E, Fe 3+ / Fe 2+ Recycling: Water-containing iron sludge e is added to the dissimilar iron reduction system. Dissimilar iron reducing bacteria use methanol b as a carbon source, and under the action of these bacteria, the insoluble Fe in the iron sludge is reduced. 3+ Converted to Fe 2+ , producing Fe 2+ Treating water and CO2, containing Fe 2+ The treated water is used for the Fenton reaction in step C, and the generated CO2 is collected and used in step B; the heterogeneous iron reduction reactor is an upflow anaerobic sludge bed reactor with a reactor temperature of 34~36℃ and a pH of 6.5~7.

5.

2. The method for deep treatment and resource utilization of lead-zinc ore beneficiation wastewater based on bioreduction according to claim 1, characterized in that, The flocculants used for flocculation and precipitation in step A are PAC and PAM.

3. The method for deep treatment and resource utilization of lead-zinc ore beneficiation wastewater based on bioreduction according to claim 2, characterized in that, The mass ratio of PAC to PAM is (5~60):

1.

4. The method for deep treatment and resource utilization of lead-zinc ore beneficiation wastewater based on bioreduction according to claim 1, characterized in that, The CO2 hardening process described in step A involves pressurized dissolved gas aeration with a pressure range of 0.2~0.6MPa and a CO2 dosage of 0.8~2g / L.

5. The method for deep treatment and resource utilization of lead-zinc ore beneficiation wastewater based on bioreduction according to claim 1, characterized in that, The precipitant mentioned in step D is Ba(OH)2.

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