Sludge and sewage step-by-step treatment system and process based on lead zinc ore mining

Abstract

The invention provides a lead zinc ore mining-based sludge and sewage step-by-step treatment system, which comprises a pretreatment system, a chemical precipitation system, a biological treatment system and a post-treatment system, the pretreatment system comprises a grid and a grit chamber, the chemical precipitation system comprises an adjusting tank, a reaction tank and a segmented precipitation tank, the biological treatment system comprises a biological aeration filter tank and a biological oxidation tank. According to the sludge and sewage step-by-step treatment system based on lead-zinc ore mining provided by the invention, multi-layer sequential treatment operation is carried out through the sectional sedimentation tank in the lead-zinc ore sludge and sewage treatment process, and sludge containing heavy metals and impurities in sewage can be treated for multiple times; meanwhile, in the post-treatment system, sludge and sewage which are finally generated can be subjected to later classification treatment and utilization by utilizing sand filtering device sludge treatment equipment and activated carbon filtering and sludge treatment equipment, so that the utilization rate of residues can be increased.

Description

Technical Field

[0001] The invention relates to the field of lead-zinc mine sludge and sewage treatment, and in particular to a sludge and sewage step-by-step treatment system and process based on lead-zinc mine mining. Background Art

[0002] During the mining process of lead and zinc mines, a large amount of mine water is produced. The mine water is often contaminated by the minerals contained in the ore and contains high concentrations of heavy metal ions, such as lead, zinc, cadmium, mercury, etc. In addition, mining operations also produce a large amount of slag. Under the action of rainwater scouring and self-leaching, the slag will release heavy metals into the water body, forming sludge and sewage containing heavy metals.

[0003] At present, in the process of lead-zinc mine sludge and sewage treatment, precipitation operations of sludge and sewage containing heavy metals are carried out. However, in the precipitation operation, the metal impurities in the sludge and sewage containing heavy metals are preliminarily treated by chemical treatment in the reaction tank and then transported to the sedimentation tank for precipitation operation. However, the current precipitation process is mostly carried out in a single precipitation manner, and the single precipitation operation method cannot carry out detailed treatment of heavy metals in the sludge and sewage containing heavy metals. At the same time, the sludge and sewage generated in the later stage of treatment are difficult to be more carefully treated and utilized.

[0004] Therefore, it is necessary to provide a step-by-step treatment system for sludge and sewage based on lead-zinc mining to solve the above technical problems. Summary of the invention

[0005] The present invention provides a sludge and sewage step-by-step treatment system based on lead-zinc mining, which solves the problem that in the treatment of lead-zinc sludge and sewage, heavy metals in the sludge and sewage containing heavy metals cannot be carefully treated by a single sedimentation operation, and the sludge and sewage generated in the later stage of the treatment are difficult to be more carefully treated and utilized.

[0006] In order to solve the above technical problems, the present invention provides a step-by-step treatment system for sludge and sewage based on lead-zinc mining, comprising:

[0007] A pretreatment system, a chemical precipitation system, a biological treatment system and a post-treatment system, wherein the pretreatment system includes a grid and a sand settling tank, the chemical precipitation system includes a regulating tank, a reaction tank and a staged sedimentation tank, the biological treatment system includes a biological aeration filter and a biological oxidation tank, and the post-treatment system includes a sand filter sludge treatment device and an activated carbon filter and sludge treatment device;

[0008] The grid is connected to the input end of the grit tank through a pipeline, the output end of the grit tank is connected to the input end of the regulating tank through a pipeline, the output end of the regulating tank is connected to the input end of the reaction tank through a pipeline, the output end of the reaction tank is connected to the input end of the segmented sedimentation tank through a pipeline, the output end of the segmented sedimentation tank is connected to the input end of the biological aeration filter through a pipeline, the output end of the biological aeration filter is connected to the input end of the biological oxidation tank through a pipeline, the output end of the biological oxidation tank is respectively connected to the input end of the sand filter device sludge treatment equipment and the input end of the activated carbon filtration and sludge treatment equipment through pipelines, and a separation wastewater treatment tank is connected between the output end of the sand filter device sludge treatment equipment and the output end of the activated carbon filtration and sludge treatment equipment through a pipeline.

[0009] A step-by-step treatment process for sludge and sewage from lead-zinc mining comprises the following steps:

[0010] S1, sewage enters the pretreatment system;

[0011] S11, firstly, the sewage is transported into the interior of the screen through an external device to remove larger suspended solids and debris in the sewage;

[0012] S12, after the larger suspended solids and debris in the sewage are blocked by the grille in S11, the sewage treated by the grille is transported to the inside of the grit chamber through the pipeline. After the sewage treated in S11 is transported to the inside of the grit chamber, the sand and inorganic particles carried in the sewage in the grit chamber are gravity-precipitated to the bottom of the grit chamber by standing still;

[0013] S13, the sewage treated in S12 is then transported to the inside of the regulating tank through a pipeline. When the sewage flows into the regulating tank, the inlet and outlet flow rates are adjusted by a liquid level control device and an inlet and outlet valve, so that the sewage stays in the regulating tank for a specified time, thereby achieving the purpose of uniform water quality and water quantity;

[0014] S2, chemical precipitation system treatment;

[0015] S21, when the sewage treated in S13 is transported from the regulating tank to the reaction tank of the chemical precipitation system through a pipeline, after the sewage treated in S13 is transported to the inside of the reaction tank, sodium sulfide for removing heavy metal ions and lime or iron salt for removing phosphorus are sequentially added according to the type and concentration of pollutants in the sewage to react and form precipitation;

[0016] S22, the sewage treated in S21 is transported to the segmented sedimentation tanks through pipelines for sedimentation and separation;

[0017] S3, biological treatment system treatment;

[0018] S31, when the sewage after chemical precipitation treatment in S22 is transported from the segmented sedimentation tank to the biological aeration filter tank through a pipeline, the sewage passes through the filter materials of ceramsite and quartz sand filled in the biological aeration filter tank and a large number of microorganisms attached to the surface of the filter materials and aerated at the bottom of the filter tank by using the aeration device at the bottom of the biological aeration filter tank. When the sewage is in the biological aeration filter tank, the organic pollutants in the sewage are decomposed by the metabolism of microorganisms;

[0019] S32, when the sewage treated in S31 is transported to the interior of the biological oxidation tank through the pipeline at the output end of the biological aeration filter, it is further subjected to biological oxidation treatment to remove the remaining organic pollutants;

[0020] S4, post-processing system processing;

[0021] S41. After the sewage is treated by the biological treatment system in S3, the sewage enters the post-treatment system through the pipeline, and first passes through the sand filter device sludge treatment equipment to remove the residual sand and sediment;

[0022] S42, then pass through the activated carbon filtration sludge treatment equipment to remove the remaining pollutants by using the adsorption effect of activated carbon;

[0023] S5. The treated sewage finally enters the separated wastewater treatment tank for final water quality adjustment and discharge.

[0024] Preferably, a separation treatment device is used when performing the separation wastewater treatment operation in S5, and the separation treatment device includes a first treatment tank and a second treatment tank, and the first and second separation plates are respectively connected to the center positions of the bottoms of the inner walls of the first and second treatment tanks, and the first and second filter components are respectively arranged inside the first treatment tank and on the left and right sides of the first separation plate, a second fixed cover is arranged on the top of the second treatment tank, and a driving device is arranged on the top of the second fixed cover, and stirring elements are arranged inside the second treatment tank and on both sides of the second separation plate, and two sets of conveying devices are arranged between the first and second treatment tanks, and a first fixed cover is arranged on the top of the first treatment tank, and feed ports are opened on both sides of the surfaces of the second fixed cover and the first fixed cover.

[0025] Preferably, the first filter assembly comprises a filter box, and a filter element is installed inside the filter box.

[0026] Preferably, a filter cover is provided on the top of the filter box, and a support frame is installed inside the first treatment tank and at the bottom of the filter box.

[0027] Preferably, the second filter assembly includes a plurality of support blocks, filter plates are arranged between the plurality of support blocks, and the plurality of support blocks are respectively connected to the left and right sides of the inner wall of the first treatment tank.

[0028] Preferably, the delivery device comprises a delivery pump, the input end and the output end of the delivery pump are respectively connected to a first delivery pipe and a second delivery pipe, and one end of the second delivery pipe is connected to the second treatment tank.

[0029] Preferably, the driving device includes two rotating rods, the surfaces of the two rotating rods are respectively provided with pulleys, a belt is connected between the two pulleys, one end of one of the rotating rods is connected to a motor, a mounting frame is provided on the surface of the motor, the mounting frame is connected to the surface of the first fixed cover, and the bottom ends of the two rotating rods are connected to the top ends of the two stirring members.

[0030] Preferably, a connecting pipe is symmetrically connected to the bottom of one side of the second treatment tank.

[0031] Preferably, an operation pool is connected between the two connecting pipes.

[0032] Compared with the related art, the sludge and sewage step-by-step treatment system based on lead-zinc mining provided by the present invention has the following beneficial effects:

[0033] The present invention provides a sludge and sewage step-by-step treatment system based on lead-zinc mining. In the process of lead-zinc mining sludge and sewage treatment, multi-level sequential treatment operations are performed through segmented sedimentation tanks, and impurities in sludge and sewage containing heavy metals can be treated multiple times, so that internal impurities can be treated more carefully. At the same time, in the post-treatment system, sand filtering device sludge treatment equipment and activated carbon filtering and sludge treatment equipment can be used to classify and utilize the sludge and sewage finally generated, thereby improving the utilization rate of the residue. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic structural diagram of a first embodiment of a sludge and sewage step-by-step treatment system based on lead-zinc mining provided by the present invention;

[0035] Figure 2 A schematic structural diagram of a second embodiment of a system for step-by-step treatment of sludge and sewage based on lead-zinc mining provided by the present invention;

[0036] Figure 3 for Figure 2 The three-dimensional structure schematic diagram of the overall device from a first viewing angle is shown;

[0037] Figure 4 for Figure 2 A schematic diagram of the three-dimensional structure of the overall device from a second viewing angle is shown;

[0038] Figure 5 for Figure 2The three-dimensional structural schematic diagram of the overall device from a third viewing angle is shown.

[0039] Numbers in the figure: 1. Grid; 2. Grit chamber; 3. Regulating tank; 4. Reaction tank; 5. Segmented sedimentation tank; 6. Biological aeration filter; 7. Biological oxidation tank; 8. Sand filter sludge treatment equipment; 9. Activated carbon filtration and sludge treatment equipment; 10. Separated wastewater treatment tank;

[0040] 11. First treatment tank; 12. Second treatment tank; 13. First partition plate; 14. Second partition plate;

[0041] 15. first filter assembly; 151. filter box; 152. filter element;

[0042] 16. Support frame;

[0043] 17. second filter assembly; 171. support block; 172. filter plate;

[0044] 18. Delivery device; 181. Delivery pump; 182. First delivery pipe; 183. Second delivery pipe;

[0045] 19. First fixed cover; 20. Second fixed cover;

[0046] 21. driving device; 211. rotating rod; 212. pulley; 213. belt; 214. motor;

[0047] 22. Filter cover; 23. Stirring element; 24. Feed inlet; 25. Connecting pipe; 26. Operating pool. DETAILED DESCRIPTION

[0048] The present invention will be further described below in conjunction with the accompanying drawings and implementation modes.

[0049] First embodiment

[0050] Please refer to Figure 1 ,in, Figure 1 The present invention provides a schematic diagram of the structure of a first embodiment of a sludge and sewage step-by-step treatment system based on lead-zinc mining. A sludge and sewage step-by-step treatment system based on lead-zinc mining includes:

[0051] A pretreatment system, a chemical precipitation system, a biological treatment system and a post-treatment system, wherein the pretreatment system includes a grid 1 and a sand settling tank 2, the chemical precipitation system includes a regulating tank 3, a reaction tank 4 and a staged sedimentation tank 5, the biological treatment system includes a biological aeration filter 6 and a biological oxidation tank 7, and the post-treatment system includes a sand filter sludge treatment device 8 and an activated carbon filter and sludge treatment device 9;

[0052] The grid 1 is connected to the input end of the grit tank 2 through a pipeline, the output end of the grit tank 2 is connected to the input end of the regulating tank 3 through a pipeline, the output end of the regulating tank 3 is connected to the input end of the reaction tank 4 through a pipeline, the output end of the reaction tank 4 is connected to the input end of the segmented sedimentation tank 5 through a pipeline, the output end of the segmented sedimentation tank 5 is connected to the input end of the biological aeration filter 6 through a pipeline, the output end of the biological aeration filter 6 is connected to the input end of the biological oxidation tank 7 through a pipeline, the output end of the biological oxidation tank 7 is respectively connected to the input end of the sand filter device sludge treatment equipment 8 and the input end of the activated carbon filtration and sludge treatment equipment 9 through pipelines, and a separated wastewater treatment tank 10 is connected between the output end of the sand filter device sludge treatment equipment 8 and the output end of the activated carbon filtration and sludge treatment equipment 9 through a pipeline.

[0053] Segmented precipitation equipment 9: For the sewage after preliminary treatment, the segmented precipitation method is adopted to first adjust the pH value to a suitable range so that one heavy metal ion is precipitated first. For example, at a lower pH value (such as pH = 8-9), zinc hydroxide precipitation is relatively complete, while lead ions are still in the solution. Then the pH value is adjusted again (such as pH = 9-10) so that the lead ions form lead hydroxide precipitation, which can improve the separation efficiency of heavy metal ions.

[0054] Sand filter sludge treatment equipment 8:

[0055] Backwash system:

[0056] Backwash pump: When the sand filter device needs backwashing, the backwash pump provides sufficient pressure so that the backwash water can effectively flush the sand layer;

[0057] Backwash water tank: used to store backwash water, its volume must meet the water volume required for one backwash;

[0058] Backwash wastewater collection tank:

[0059] Mixing equipment: In the collection tank, if the sludge is easy to settle and needs to be better mixed for subsequent treatment, mixing equipment can be installed;

[0060] Sand sedimentation equipment:

[0061] Inclined plate sedimentator: To more efficiently precipitate sand, an inclined plate sedimentator can be set in the collection tank, which can increase the sedimentation area and speed up the sedimentation of sand;

[0062] Sludge sedimentation and concentration equipment:

[0063] Center-drive concentrator: used for sedimentation and concentration of sludge. Through slow rotation, the sludge is gathered in the center to separate the water.

[0064] Sludge conveying equipment:

[0065] Sludge pump: transports concentrated sludge from the collection tank to the sludge dewatering workshop. Its flow rate and head should be adapted to the nature of the sludge and the transportation distance.

[0066] Activated carbon filtration and sludge treatment equipment 9:

[0067] Activated carbon collection container:

[0068] Special sealed barrel: used to collect activated carbon that has been saturated with adsorption. The material should be corrosion-resistant and well sealed to prevent the leakage of pollutants in the activated carbon. Generally, it is made of plastic or stainless steel, and the capacity is determined according to the amount of activated carbon replacement;

[0069] Activated carbon regeneration equipment:

[0070] Thermal regeneration furnace: used to regenerate activated carbon by high temperature heating;

[0071] Chemical regeneration equipment: Chemical regeneration requires equipment equipped with reactors and reagent storage tanks;

[0072] Impurity cleaning and conveying equipment:

[0073] Filter cleaning equipment: used to regularly clean the filters installed at the front and rear ends, such as high-pressure water guns, which can effectively remove impurities on the filters;

[0074] Impurity collection bucket and conveying equipment: used to collect the cleaned impurities and convey them to the sludge thickening tank.

[0075] A step-by-step treatment process for sludge and sewage from lead-zinc mining comprises the following steps:

[0076] S1, sewage enters the pretreatment system;

[0077] S11, firstly, the sewage is transported into the interior of the grid 1 through an external device to remove larger suspended solids and debris in the sewage;

[0078] S12, after the larger suspended solids and debris in the sewage are blocked by the grid 1 in S11, the sewage treated by the grid 1 is then transported to the inside of the grit chamber 2 through a pipeline. After the sewage treated in S11 is transported to the inside of the grit chamber 2, the sand and inorganic particles carried in the sewage in the grit chamber 2 are gravity-precipitated to the bottom of the grit chamber 2 by standing still;

[0079] S13, the sewage treated in S12 is then transported to the inside of the regulating tank 3 through a pipeline. After the sewage flows into the regulating tank 3, the inlet and outlet flow rates are adjusted by a liquid level control device and an inlet and outlet valve, so that the sewage stays in the regulating tank 3 for a specified time, thereby achieving the purpose of uniform water quality and water quantity;

[0080] S2, chemical precipitation system treatment;

[0081] S21, when the sewage treated in S13 is transported from the regulating tank 3 to the reaction tank 4 of the chemical precipitation system through a pipeline, after the sewage treated in S13 is transported to the inside of the reaction tank 4, sodium sulfide for removing heavy metal ions and lime or iron salt for removing phosphorus are sequentially added according to the type and concentration of pollutants in the sewage to react and form precipitation;

[0082] S22, the sewage treated in S21 is transported to the segmented sedimentation tank 5 through pipelines for sedimentation and separation;

[0083] S3, biological treatment system treatment;

[0084] S31, when the sewage after chemical precipitation treatment in S22 is transported from the segmented sedimentation tank 5 to the biological aeration filter 6 through a pipeline, the sewage passes through the filter material of ceramsite and quartz sand filled in the biological aeration filter 6 and a large number of microorganisms attached to the surface of the filter material and aerated at the bottom of the filter tank by the aeration device at the bottom of the biological aeration filter 6. When the sewage is in the biological aeration filter, the organic pollutants in the sewage are decomposed by the metabolism of microorganisms;

[0085] S32, when the sewage treated in S31 is transported to the interior of the biological oxidation tank 7 through the pipeline at the output end of the biological aeration filter 6, it is further subjected to biological oxidation treatment to remove the remaining organic pollutants;

[0086] S4, post-processing system processing;

[0087] S41, after the sewage is treated by the biological treatment system in S3, the sewage enters the post-treatment system through the pipeline, and first passes through the sand filter device sludge treatment equipment 8 to remove the residual sand and sediment;

[0088] S42, then pass through the activated carbon filtration sludge treatment equipment 9, and use the adsorption effect of activated carbon to remove the remaining pollutants;

[0089] S5. The treated sewage finally enters the separated wastewater treatment tank 10 for final water quality adjustment and discharge.

[0090] Compared with the related art, the sludge and sewage step-by-step treatment system based on lead-zinc mining provided by the present invention has the following beneficial effects:

[0091] The present invention provides a sludge and sewage step-by-step treatment system based on lead-zinc mining. In the process of lead-zinc mining sludge and sewage treatment, multi-level sequential treatment operations are performed through a segmented sedimentation tank 5, and the impurities in the sludge and sewage containing heavy metals can be treated multiple times, so that the internal impurities can be treated more carefully. At the same time, in the post-treatment system, the sand filter device sludge treatment equipment 8 and the activated carbon filter and sludge treatment equipment 9 can be used to classify and utilize the sludge and sewage finally generated, thereby improving the utilization rate of the residue.

[0092] Second embodiment

[0093] Please refer to Figure 2 , Figure 3 , Figure 4 and Figure 5 Based on the first embodiment of the present application, a sludge and sewage step-by-step treatment process based on lead-zinc mining is provided. The second embodiment of the present application proposes another sludge and sewage step-by-step treatment process based on lead-zinc mining. The second embodiment is only a preferred method of the first embodiment, and the implementation of the second embodiment will not affect the independent implementation of the first embodiment.

[0094] Specifically, the difference of the step-by-step treatment process of sludge and sewage based on lead-zinc mining provided by the second embodiment of the present application is that, in the step-by-step treatment process of sludge and sewage based on lead-zinc mining, a separation treatment device will be used when performing the separation wastewater treatment operation in S5, and the separation treatment device includes a first treatment tank 11 and a second treatment tank 12, and the first treatment tank 11 and the second treatment tank 12 are respectively connected to the center position of the bottom of the inner wall of the first treatment tank 11 and the second treatment tank 12. The first separation plate 13 and the second separation plate 14 are respectively connected, and the first treatment tank 11 is provided with a first filter component 15 and a second filter component 17 on the left and right sides of the first separation plate 13, a second fixed cover 20 is provided on the top of the second treatment tank 12, and a driving device 21 is provided on the top of the second fixed cover 20, and a stirring member 23 is provided on both sides of the second treatment tank 12 and on the second separation plate 14, and two sets of conveying devices 18 are provided between the first treatment tank 11 and the second treatment tank 12, and a first fixed cover 19 is provided on the top of the first treatment tank 11, and feed ports 24 are opened on both sides of the surface of the second fixed cover 20 and the first fixed cover 19.

[0095] The feed port 24 is provided to facilitate the addition of wastewater and chemicals. A through hole is provided on the second fixed cover 20 to facilitate the installation of the rotating rod 211. The rotating rod 211 and the connection between the second fixed cover 20 and the rotating rod 211 are connected through a bearing.

[0096] The first filter assembly 15 includes a filter box 151 , and a filter element 152 is installed inside the filter box 151 .

[0097] A filter cover 22 is disposed on the top of the filter box 151 , and a support frame 16 is installed inside the first treatment tank 11 and at the bottom of the filter box 151 .

[0098] The use of the support frame 16 and the plurality of support blocks 171 facilitates the support of the filter box 151 and the filter plate 172 during installation. The filter element 152 is composed of a layer of quartz sand and filter cotton. The use of the filter plate 172 facilitates the treatment of impurities during the stratified water transportation after the wastewater generated by the sludge treatment equipment 8 of the sand filter device is precipitated on one side of the interior of the first treatment tank 11. When in use, the wastewater generated by the sludge treatment equipment 8 of the sand filter device is transported to one side of the interior of the first treatment tank 11 through the filter plate 172 for precipitation, while the wastewater generated by the sludge treatment equipment 9 for the activated carbon filtration is filtered through the filter cover 22, the filter element 152 and the filter box 151. After the wastewater is treated by the two methods, the two delivery pumps 181 are started respectively to transport the wastewater on both sides of the interior of the first treatment tank 11 through the two first delivery pipes 182 and the two second delivery pipes 183 to the interior of the second treatment tank 12 and located at the second partition plate 14. On the left and right sides, when the wastewater generated by the two methods is transported to the left and right sides of the inside of the second treatment tank 12, chemicals are added to the feed hopper through the feed port 24 on the surface of the second fixed cover 20. After different chemicals are added to the wastewater on both sides of the inside of the second treatment tank 12, the motor 241 is started to drive one of the rotating rods 211 to rotate, and when one of the rotating rods 211 rotates, it drives one of the pulleys 212 to rotate, and when one of the pulleys 212 rotates, it drives the other pulley 212 to rotate through the belt 213, and when the other pulley 212 rotates, it drives the other rotating rod 211 to rotate, and when the two rotating rods 211 rotate, they respectively drive the two wastewaters added with chemicals in the second treatment tank 12 to stir, and after the wastewater in the second treatment tank 12 is treated, it is transported to the operation tank 26 through the connecting pipes 25 on both sides of the bottom of one side of the second treatment tank 12 for final operation.

[0099] The second filter assembly 17 includes a plurality of support blocks 171 , filter plates 172 are disposed between the plurality of support blocks 171 , and the plurality of support blocks 171 are respectively connected to the left and right sides of the inner wall of the first treatment tank 11 .

[0100] The conveying device 18 includes a conveying pump 181 , the input end and the output end of the conveying pump 181 are respectively connected to a first conveying pipe 182 and a second conveying pipe 183 , and one end of the second conveying pipe 183 is connected to the second treatment tank 12 .

[0101] The driving device 21 includes two rotating rods 211, and the surfaces of the two rotating rods 211 are both provided with pulleys 212, and a belt 213 is connected between the two pulleys 212. One end of one of the rotating rods 211 is connected to a motor 214, and the surface of the motor 214 is provided with a mounting frame 22, and the mounting frame 22 is connected to the surface of the first fixed cover 20. The bottom ends of the two rotating rods 211 are connected to the top ends of the two stirring members 23.

[0102] A connecting pipe 25 is symmetrically connected to the bottom of one side of the second treatment tank 12 .

[0103] An operation pool 26 is connected between the two connecting pipes 25 .

[0104] Compared with the related art, the step-by-step treatment process of sludge and sewage based on lead-zinc mining provided by the present invention has the following beneficial effects:

[0105] The present invention provides a step-by-step treatment system for sludge and sewage based on lead-zinc mining, wherein a first filter component 15 and a second filter component 17 are respectively arranged inside a first treatment tank 11 with a first partition plate 13, and two stirring members 23 and a driving device 21 are arranged inside a second treatment tank 12 with a second partition plate 14. The wastewater generated by the two methods can be transported to the first treatment tank 11 and the second treatment tank 12 for treatment respectively, thereby improving the treatment function of the entire device.

[0106] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A sludge and sewage step-by-step treatment system based on lead-zinc mining, characterized in that: include: A pretreatment system, a chemical precipitation system, a biological treatment system and a post-treatment system, wherein the pretreatment system includes a grid and a sand settling tank, the chemical precipitation system includes a regulating tank, a reaction tank and a staged sedimentation tank, the biological treatment system includes a biological aeration filter and a biological oxidation tank, and the post-treatment system includes a sand filter sludge treatment device and an activated carbon filter and sludge treatment device; The grid is connected to the input end of the grit tank through a pipeline, the output end of the grit tank is connected to the input end of the regulating tank through a pipeline, the output end of the regulating tank is connected to the input end of the reaction tank through a pipeline, the output end of the reaction tank is connected to the input end of the segmented sedimentation tank through a pipeline, the output end of the segmented sedimentation tank is connected to the input end of the biological aeration filter through a pipeline, the output end of the biological aeration filter is connected to the input end of the biological oxidation tank through a pipeline, the output end of the biological oxidation tank is respectively connected to the input end of the sand filter device sludge treatment equipment and the input end of the activated carbon filtration and sludge treatment equipment through pipelines, and a separation wastewater treatment tank is connected between the output end of the sand filter device sludge treatment equipment and the output end of the activated carbon filtration and sludge treatment equipment through a pipeline.

2. A process for treating sludge and sewage in a step-by-step manner based on lead-zinc mining, using the system for treating sludge and sewage in a step-by-step manner based on lead-zinc mining as claimed in claim 1, characterized in that: The following steps are involved: S1, sewage enters the pretreatment system; S11, firstly, the sewage is transported into the interior of the screen through an external device to remove larger suspended solids and debris in the sewage; S12, after the larger suspended solids and debris in the sewage are blocked by the grille in S11, the sewage treated by the grille is transported to the inside of the grit chamber through the pipeline. After the sewage treated in S11 is transported to the inside of the grit chamber, the sand and inorganic particles carried in the sewage in the grit chamber are gravity-precipitated to the bottom of the grit chamber by standing still; S13, the sewage treated in S12 is then transported to the inside of the regulating tank through a pipeline. When the sewage flows into the regulating tank, the inlet and outlet flow rates are adjusted by a liquid level control device and an inlet and outlet valve, so that the sewage stays in the regulating tank for a specified time, thereby achieving the purpose of uniform water quality and water quantity; S2, chemical precipitation system treatment; S21, when the sewage treated in S13 is transported from the regulating tank to the reaction tank of the chemical precipitation system through a pipeline, after the sewage treated in S13 is transported to the inside of the reaction tank, sodium sulfide for removing heavy metal ions and lime or iron salt for removing phosphorus are sequentially added according to the type and concentration of pollutants in the sewage to react and form precipitation; S22, the sewage treated in S21 is transported to the segmented sedimentation tanks through pipelines for sedimentation and separation; S3, biological treatment system treatment; S31, when the sewage after chemical precipitation treatment in S22 is transported from the segmented sedimentation tank to the biological aeration filter tank through a pipeline, the sewage passes through the filter materials of ceramsite and quartz sand filled in the biological aeration filter tank and a large number of microorganisms attached to the surface of the filter materials and aerated at the bottom of the filter tank by using the aeration device at the bottom of the biological aeration filter tank. When the sewage is in the biological aeration filter tank, the organic pollutants in the sewage are decomposed by the metabolism of microorganisms; S32, when the sewage treated in S31 is transported to the interior of the biological oxidation tank through the pipeline at the output end of the biological aeration filter, it is further subjected to biological oxidation treatment to remove the remaining organic pollutants; S4, post-processing system processing; S41. After the sewage is treated by the biological treatment system in S3, the sewage enters the post-treatment system through the pipeline, and first passes through the sand filter device sludge treatment equipment to remove the residual sand and sediment; S42, then pass through the activated carbon filtration sludge treatment equipment to remove the remaining pollutants by using the adsorption effect of activated carbon; S5. The treated sewage finally enters the separated wastewater treatment tank for final water quality adjustment and discharge.

3. The process for treating sludge and sewage in a step-by-step manner based on lead-zinc mining according to claim 2 is characterized in that: When performing the separation wastewater treatment operation in S5, a separation treatment device is used, and the separation treatment device includes a first treatment tank and a second treatment tank, and the first treatment tank and the second treatment tank are respectively connected to the center position of the bottom of the inner wall of the first treatment tank and the second treatment tank. The first filter component and the second filter component are respectively arranged inside the first treatment tank and on the left and right sides of the first separation plate, a second fixed cover is arranged on the top of the second treatment tank, and a driving device is arranged on the top of the second fixed cover. Stirring elements are arranged inside the second treatment tank and on both sides of the second separation plate, two sets of conveying devices are arranged between the first treatment tank and the second treatment tank, and a first fixed cover is arranged on the top of the first treatment tank, and feed ports are opened on both sides of the surface of the second fixed cover and the first fixed cover.

4. The process for treating sludge and sewage in a step-by-step manner based on lead-zinc mining according to claim 3 is characterized in that: The first filter assembly comprises a filter box, and a filter element is installed inside the filter box.

5. The process for treating sludge and sewage in a step-by-step manner based on lead-zinc mining according to claim 4 is characterized in that: A filter cover is arranged on the top of the filter box, and a support frame is installed inside the first treatment tank and at the bottom of the filter box.

6. The process for treating sludge and sewage in a step-by-step manner based on lead-zinc mining according to claim 4, characterized in that: The second filter assembly includes a plurality of support blocks, filter plates are arranged between the plurality of support blocks, and the plurality of support blocks are respectively connected to the left and right sides of the inner wall of the first treatment tank.

7. The process for treating sludge and sewage in a step-by-step manner based on lead-zinc mining according to claim 4, characterized in that: The conveying device comprises a conveying pump, the input end and the output end of the conveying pump are respectively connected to a first conveying pipe and a second conveying pipe, and one end of the second conveying pipe is connected to the second treatment tank.

8. The process for treating sludge and sewage in a step-by-step manner based on lead-zinc mining according to claim 4, characterized in that: The driving device includes two rotating rods, the surfaces of the two rotating rods are respectively provided with pulleys, a belt is connected between the two pulleys, one end of one of the rotating rods is connected to a motor, a mounting frame is provided on the surface of the motor, the mounting frame is connected to the surface of the first fixed cover, and the bottom ends of the two rotating rods are connected to the top ends of the two stirring members.

9. The process for treating sludge and sewage in a step-by-step manner based on lead-zinc mining according to claim 4, characterized in that: The bottom of one side of the second treatment tank is symmetrically connected with a connecting pipe.

10. The process for treating sludge and sewage in a step-by-step manner based on lead-zinc mining according to claim 9, characterized in that: An operation pool is connected between the two connecting pipes.

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