A treatment system for recycling low-turbidity fluorite mine production wastewater

Abstract

The present invention relates to a treatment system for recycling low-turbidity fluorite mine production wastewater, and relates to the technical field of wastewater treatment. It includes a control system, an incoming water collection system, a purification and turbidity removal system, and an oxidation oil removal system, wherein the incoming water collection system, the purification and turbidity removal system, and the oxidation oil removal system are connected in sequence, and the water outlets of the incoming water collection system, the purification and turbidity removal system, and the oxidation oil removal system are all provided with online monitoring devices, and the online monitoring devices intermittently detect the water quality of the outlet water and feed back to the control system. The present invention has strong resistance to water quality shocks, and has the advantages of good treatment effect, simple control, high degree of automation, and low investment cost.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, in particular to a treatment system for recycling low-turbidity fluorite mine production wastewater. Background Art

[0002] Fluorite is an important industrial raw material. Fluorite flotation uses a large amount of water, and wastewater is generated during the production process. The wastewater mainly contains SS, CODcr, and heavy metals such as arsenic and chromium. Suspended solids are mainly composed of rock powder, flotation agents, etc., and are milky white and turbid. The colloid is relatively stable and difficult to remove by conventional precipitation. Suspended solids are the main factor affecting the utilization of circulating water and have a great impact on the subsequent flotation process. The main manifestation is that the increase in the amount of flotation agent leads to further deterioration of water quality, forming a vicious cycle.

[0003] Mining flotation wastewater contains flotation agents such as silicate, oleic acid, and sodium bicarbonate, which cause serious environmental pollution. With the increasing requirements of the country for ecological environmental protection and the scarcity of water resources, it is required to increase the water reuse rate in mining areas, and some mining areas even require zero discharge. The flotation production wastewater is treated and recycled, and the mud cake produced is used to make cement and other underground fillings, achieving zero discharge of resource wastewater and pollutants.

[0004] The existing treatment technology mainly adopts the coagulation and sedimentation method, with PAC as the coagulant, and PAM as an auxiliary, or PAM as the direct addition method. Since the wastewater contains substances such as silicates and oleic acid, the colloid formed is relatively stable. After being treated with the existing coagulants and coagulation forms, the turbidity in the wastewater is still above 70NTU. During the flotation process, part of the flotation agent will be carried away by the residual suspended matter, resulting in a large amount of flotation agent and high treatment cost. In addition, part of the oleic acid added during the flotation process will remain in the water, causing the CODcr in the water to continue to increase, affecting the quality of the flotation product.

[0005] How to provide a treatment system for recycling low-turbidity fluorite mine production wastewater has become a technical problem that technicians in this field need to solve urgently. Summary of the invention

[0006] The main purpose of the present invention is to provide a treatment system for recycling low-turbidity fluorite mine production wastewater, which has strong resistance to water quality shock, good treatment effect, simple control, high degree of automation, low investment cost and the like.

[0007] To achieve the above-mentioned purpose, the present invention provides a treatment system for recycling low-turbidity fluorite mine production wastewater, including: a control system, a water collection system, a purification and turbidity removal system and an oxidation and oil removal system, wherein:

[0008] The incoming water collection system, the purification and turbidity removal system, and the oxidation and oil removal system are connected in sequence. The outlets of the incoming water collection system, the purification and turbidity removal system, and the oxidation and oil removal system are all equipped with online monitoring devices, which intermittently detect the outlet water quality and feed back to the control system.

[0009] Furthermore, the incoming water collection system includes a water collection pool, and the incoming water of the water collection pool mainly comes from the production water of the fluorite mine.

[0010] Furthermore, the purification and turbidity removal system includes an adsorption oil removal tank, a coagulation tank, a coagulation-aiding tank, a sedimentation tank and a filter tank, and the adsorption oil removal tank, the coagulation tank, the coagulation-aiding tank, the sedimentation tank and the filter tank are connected in sequence.

[0011] Furthermore, the adsorption oil removal tank, coagulation tank and coagulant aid tank are all provided with a stirring device and a dosing device, the sedimentation tank is provided with an inclined plate and a mud discharge pipe, and the filter material of the filter tank is one or more of quartz sand, manganese sand and anthracite.

[0012] Furthermore, an adsorbent is added to the adsorption oil removal tank, and the adsorbent is one or more of powdered carbon, fiber, and diatomaceous earth. A compound coagulant is added to the coagulation tank, and a coagulant aid is added to the coagulant aid tank, and the coagulant aid is one of anions and cations.

[0013] Furthermore, the raw material composition of the composite coagulant is measured in weight percentage as follows: 24% Al2O3, 22% SiO2, 16% CaO, 12% Fe2O3, 15% MgO2, and the rest is crystal water.

[0014] Furthermore, the oxidation and oil removal system includes a No. 1 lifting pump, a No. 1 oleic acid oxidation tower, a No. 2 lifting pump, a No. 2 oleic acid oxidation tower, an exhaust gas destruction device, an ozone booster pump and an ozone generating device. The No. 1 oleic acid oxidation tower is connected to the filter tank through the No. 1 lifting pump; the No. 2 oleic acid oxidation tower is connected to the No. 1 oleic acid oxidation tower through the No. 2 lifting pump; the exhaust gas destruction device is respectively connected to the exhaust gas outlets of the No. 1 oleic acid oxidation tower and the No. 2 oleic acid oxidation tower; the ozone generating device is respectively connected to the No. 1 oleic acid oxidation tower and the No. 2 oleic acid oxidation tower through the ozone booster pump; the ozone booster pump and the ozone generating device are electrically connected to the control system, and the air intake volume is linked to the inlet water quality.

[0015] Furthermore, the No. 1 oleic acid oxidation tower has the same structure as the No. 2 oleic acid oxidation tower, and is provided with a water distributor, a photocatalytic filler area, an ozone inlet pipe and an ozone aeration head; the ozone booster pump is connected to the ozone aeration head through the ozone inlet pipe; the water distributor is connected to the water inlet of the oleic acid oxidation tower; the photocatalytic filler area is located below the water distributor.

[0016] Furthermore, the photocatalytic filler area is provided with a photocatalyst, and the outer side of the area is made of transparent material, and natural light is directly used. The photocatalyst is a visible light photocatalyst, and the main components are TiO2 and SnS2.

[0017] Furthermore, the effluent quality includes parameters of flow rate, turbidity, pH, and COD.

[0018] The beneficial effects of the present invention are:

[0019] The present invention provides a treatment system for recycling low-turbidity fluorite mine production wastewater, which uses ozone + activated carbon adsorption to remove CODcr in the water, and a compound coagulant and PAM to remove suspended matter in the water. The multi-stage reaction + high-efficiency coagulation and sedimentation method is adopted, and the sedimentation area is provided with sludge return, which improves the effective utilization rate of the agent and reduces the treatment cost. The present invention has strong resistance to water quality shock, and has the advantages of good treatment effect, simple control, high degree of automation, low investment cost, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is the overall structure diagram of the present invention.

[0021] Figure 2 It is a structural schematic diagram of the No. 1 oleic acid oxidation tower of the present invention.

[0022] Among them, 1. control system; 2. water collection system; 3. purification and turbidity removal system; 4. oxidation oil removal system; 11. online monitoring device, 21. water collection tank, 31. adsorption oil removal tank, 32. coagulation tank, 33. coagulation aid tank, 34a. oil removal tank mixer, 34b. coagulation mixer, 34c. coagulation aid mixer, 35. sedimentation tank, 36. inclined plate, 37. filter tank, 38a. adsorbent dosing device, 38b. coagulant dosing device, 38c. coagulant dosing device , 39, mud discharge pipe, 41a, No. 1 lifting pump, 41b, No. 2 lifting pump, 42a, No. 1 oleic acid oxidation tower, 42b, No. 2 oleic acid oxidation tower, 43, tail gas destruction device, 44, ozone booster pump, 45, ozone generating device, 421, oleic acid oxidation tower water inlet, 422, tail gas outlet, 423, water distributor, 424, photocatalytic filler area, 425, ozone inlet pipe, 426, photocatalyst, 427, oleic acid oxidation tower water outlet, 428, ozone aeration head. DETAILED DESCRIPTION

[0023] In order to achieve the above-mentioned purpose and effect, the technical means and structures adopted by the present invention are described in detail with reference to the accompanying drawings for the features and functions of the preferred embodiments of the present invention.

[0024] like Figure 1-2 As shown, the purpose of the present invention is to provide Figure 1-2As shown, the purpose of the present invention is to provide a treatment system for recycling low-turbidity fluorite mine production wastewater, including: a control system 1, a water collection system 2, a purification and turbidity removal system 3 and an oxidation and oil removal system 4; wherein,

[0025] The incoming water collection system 2, the purification and turbidity removal system 3, and the oxidation and oil removal system 4 are connected in sequence. The outlets of the incoming water collection system 2, the purification and turbidity removal system 3, and the oxidation and oil removal system 4 are all provided with online monitoring devices 11, which intermittently detect the quality of the outlet water and feed it back to the control system 1. The outlet water quality includes parameters such as flow rate, turbidity, pH, and COD.

[0026] The incoming water collection system 2 includes a water collection tank 21, and the incoming water of the water collection tank 21 mainly comes from the production water of the fluorite mine.

[0027] The purification and turbidity removal system 3 comprises an adsorption oil removal tank 31, a coagulation tank 32, a coagulation aid tank 33, a sedimentation tank 35 and a filter tank 37, and the adsorption oil removal tank 31, the coagulation tank 32, the coagulation aid tank 33, the sedimentation tank 35 and the filter tank 37 are connected in sequence. The adsorption oil removal tank 31, the coagulation tank 32, the coagulation aid tank 33 and the sedimentation tank 35 are connected by partition walls or pipe grooves.

[0028] The adsorption oil removal tank 31, the coagulation tank 32, and the coagulation aid tank 33 are all equipped with a stirring device and a dosing device. The sedimentation tank 35 is provided with an inclined plate 36 and a mud discharge pipe 39. The filter material of the filter tank 37 is one or more of quartz sand, manganese sand, and anthracite. The dosing device is connected to the control system 1, and the dosing amount is linked to the influent water quality.

[0029] The adsorption oil removal tank 31 is doped with adsorbent through the adsorbent dosing device 38a. The adsorbent is one or more of powdered carbon, fiber, and diatomaceous earth. Preferably, powdered carbon and diatomaceous earth are mixed, and the mixing ratio of powdered carbon and diatomaceous earth is 7:3; the coagulation tank 32 is doped with a compound coagulant through the coagulant dosing device 38b, and the coagulant aid is added to the coagulation aid tank 33 through the coagulant dosing device 38c. The coagulant aid is one of anions and cations, wherein anions are anionic polyacrylamide and cations are cationic polyacrylamide. In the embodiment, 200Da anionic polyacrylamide is used. The coagulant aid can be added in liquid or solid dissolved according to demand, and the dosage of the coagulant aid can be automatically added according to the SS value of the influent.

[0030] In this embodiment, the raw material composition of the compound coagulant is measured in weight percentage as follows: 24% Al2O3, 22% SiO2, 16% CaO, 12% Fe2O3, 15% MgO2, and the rest is crystal water. The compound coagulant is used to destroy the electrolyte balance of the original colloidal substances in the fluorite production wastewater, which makes the suspended matter easier to settle. The integrated high-efficiency water purification device is suitable for small fluorite mines, and the process is convenient and efficient. The compound coagulant can be added in liquid or solid dissolution according to demand, and the dosage of the compound coagulant can be automatically added according to the SS value of the influent.

[0031] The oxidation oil removal system 4 includes a No. 1 lifting pump 41a, a No. 1 oleic acid oxidation tower 42a, a No. 2 lifting pump 41b, a No. 2 oleic acid oxidation tower 42b, a tail gas destruction device 43, an ozone booster pump 44 and an ozone generating device. The No. 1 oleic acid oxidation tower 42a is connected to the filter tank 37 through the No. 1 lifting pump 41a; the No. 2 oleic acid oxidation tower 42b is connected to the oleic acid oxidation tower water outlet 427 of the No. 1 oleic acid oxidation tower 42a through the No. 2 lifting pump 41b; the tail gas destruction device 43 is respectively connected to the tail gas outlets 422 of the No. 1 oleic acid oxidation tower 42a and the No. 2 oleic acid oxidation tower 42b; the ozone generating device 45 is respectively connected to the No. 1 oleic acid oxidation tower 42a and the No. 2 oleic acid oxidation tower 42b through the ozone booster pump 44; the ozone booster pump 44 and the ozone generating device are electrically connected to the control system 1, and the air intake volume is linked to the inlet water quality. Wherein, the gas source of the ozone generating device adopts air source or oxygen source.

[0032] The No. 1 oleic acid oxidation tower 42a has the same structure as the No. 2 oleic acid oxidation tower 42b, and is provided with a water distributor 423, a photocatalytic filler area 424, an ozone air inlet pipe 425 and an ozone aeration head 428; the ozone booster pump 44 is connected to the ozone aeration head 428 through the ozone air inlet pipe 425; the water distributor 423 is connected to the water inlet 421 of the oleic acid oxidation tower; the photocatalytic filler area 424 is located below the water distributor 423. The photocatalytic filler area 424 is provided with a photocatalyst 426, and the outer side of the area is a transparent material, and natural light is directly used. The photocatalyst 426 is a visible light photocatalyst 426, and the main components are TiO2 and SnS2; the visible light photocatalyst 426 is formed by loading flake SnS2 on spherical TiO2 to form three-dimensional spheres of different sizes dispersed or agglomerated. In addition, the ozone production rate of the ozone generator can be adjusted according to the CODcr value of the influent to achieve the best CODcr removal effect.

[0033] The present invention provides a treatment system for recycling low-turbidity fluorite mine production wastewater, which adopts the method of physical and chemical removal of CODcr + high-efficiency coagulation and sedimentation + advanced oxidation tower, and removes CODcr by physical and chemical method, then adds compound coagulant and PAM to the reaction zone, adopts high-efficiency coagulation and sedimentation, and the sedimentation zone is provided with sludge reflux, and finally adopts ozone combined with photocatalyst advanced oxidation to remove residual COD, thereby improving the effective utilization rate of the reagent and reducing the treatment cost. The present invention has strong resistance to water quality shock, and has the advantages of good treatment effect, simple control, high degree of automation, low investment cost, etc.

[0034] Application Examples

[0035] 80m of a fluorite mine 3 / h flotation wastewater was operated for 15 days using the system and process of the present invention. The ozone dosage and reagent dosage during the operation of the system of the present invention are shown in Table 1. (The original process used conventional coagulation and sedimentation method, and the added PAC had no obvious effect. After treatment, the SS in the wastewater was still above 70 mg / L, and the CODcr was still above 50 mg / L).

[0036] After the system is stabilized, the dosage of compound coagulant can be reduced by 10-14%. The corresponding water quality monitoring data are shown in Table 2.

[0037] The composition of the compound coagulant is 24% Al2O3, 22% SiO2, 16% CaO, 12% Fe2O3, 15% MgO2, and the rest is crystal water.

[0038]

[0039] Table 1

[0040] Serial number Inspection items unit Measured water inflow Measured water output Assessment indicators 1 SS mg / L 235-value 1171 16 value -27 ≤50 for mine 2 CODcr mg / L 107-346 31-44 ≤50 3 pH —— 6.4-6.7 6.1-6.5 6-8

[0041] Table 2

[0042] According to Table 2, after the system is put into operation, the effluent SS is stably less than 50 mg / L, the CODcr is stably less than 50 mg / L, and the pH is between 6 and 8, meeting the fluorite mine production water reuse standards.

[0043] Compared with the traditional coagulation and sedimentation method, the fluorite mine wastewater treatment system provided by the present invention has a strong ability to resist water quality shocks and has the characteristics of good treatment effect, simple control, high degree of automation, low investment cost, etc.

[0044] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A treatment system for recycling low-turbidity fluorite mine production wastewater, characterized in that: include: Control system, water collection system, purification and turbidity removal system and oxidation oil removal system; among which, The incoming water collection system, the purification and turbidity removal system, and the oxidation and oil removal system are connected in sequence. The outlets of the incoming water collection system, the purification and turbidity removal system, and the oxidation and oil removal system are all equipped with online monitoring devices, which intermittently detect the quality of the outlet water and feed back to the control system; The purification and turbidity removal system comprises an adsorption oil removal tank, a coagulation tank, a coagulation aid tank, a sedimentation tank and a filter tank, and the adsorption oil removal tank, the coagulation tank, the coagulation aid tank, the sedimentation tank and the filter tank are connected in sequence; The adsorption oil removal tank, coagulation tank and coagulation aid tank are all equipped with a stirring device and a dosing device. The sedimentation tank is provided with an inclined plate and a mud discharge pipe. The filter material of the filter tank is one or more of quartz sand, manganese sand and anthracite. An adsorbent is added to the adsorption oil removal tank, and the adsorbent is one or more of powdered carbon, fiber, and diatomaceous earth; a compound coagulant is added to the coagulation tank; a coagulant aid is added to the coagulant aid tank, and the coagulant aid is one of anions and cations; The raw material composition of the composite coagulant is measured in weight percentage as follows: 24% Al2O3, 22% SiO2, 16% CaO, 12% Fe2O3, 15% MgO2, and the rest is crystal water; The oxidation oil removal system includes a No. 1 lifting pump, a No. 1 oleic acid oxidation tower, a No. 2 lifting pump, a No. 2 oleic acid oxidation tower, a tail gas destruction device, an ozone booster pump and an ozone generator. The No. 1 oleic acid oxidation tower is connected to the filter tank through the No. 1 lifting pump; the No. 2 oleic acid oxidation tower is connected to the No. 1 oleic acid oxidation tower through the No. 2 lifting pump; the tail gas destruction device is respectively connected to the tail gas outlets of the No. 1 oleic acid oxidation tower and the No. 2 oleic acid oxidation tower; the ozone generator is respectively connected to the No. 1 oleic acid oxidation tower and the No. 2 oleic acid oxidation tower through the ozone booster pump; the ozone booster pump and the ozone generator are electrically connected to the control system, and the air intake is linked to the water quality of the inlet water; The No. 1 oleic acid oxidation tower has the same structure as the No. 2 oleic acid oxidation tower, and is provided with a water distributor, a photocatalytic filler area, an ozone air inlet pipe and an ozone aeration head; the ozone booster pump is connected to the ozone aeration head through the ozone air inlet pipe; the water distributor is connected to the water inlet of the oleic acid oxidation tower; the photocatalytic filler area is located below the water distributor; The photocatalytic filler area is provided with a photocatalyst, and the outer side of the area is made of transparent material, and natural light is directly used. The photocatalyst is a visible light photocatalyst, and the main components are TiO2 and SnS2.

2. A treatment system for recycling low-turbidity fluorite mine production wastewater as claimed in claim 1, characterized in that: The incoming water collection system comprises a water collection pool, and the incoming water of the water collection pool mainly comes from the production water of the fluorite mine.

3. A treatment system for recycling low-turbidity fluorite mine production wastewater as claimed in claim 1, characterized in that: The effluent quality includes parameters such as flow rate, turbidity, pH, and COD.

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