CN210030257U - Stainless steel electrolytic polishing effluent treatment plant - Google Patents
Stainless steel electrolytic polishing effluent treatment plant Download PDFInfo
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- CN210030257U CN210030257U CN201920726176.3U CN201920726176U CN210030257U CN 210030257 U CN210030257 U CN 210030257U CN 201920726176 U CN201920726176 U CN 201920726176U CN 210030257 U CN210030257 U CN 210030257U
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Abstract
The utility model discloses a stainless steel electrolytic polishing wastewater treatment device, which comprises a coagulating sedimentation system, a coagulating sedimentation system and an RO reverse osmosis system; the coagulating sedimentation system comprises a primary coagulating sedimentation device and a secondary coagulating sedimentation device, wherein the primary coagulating sedimentation device is connected with the secondary coagulating sedimentation device; the primary coagulation sedimentation device is sequentially provided with a reduction tank, a pH adjusting tank, a coagulation tank, a flocculation tank and a sedimentation tank, the reduction tank is connected with a wastewater collecting tank, and the sedimentation tank is connected with the secondary coagulation sedimentation device. The utility model provides a stainless steel electrolytic polishing waste water treatment method and device design scientific and reasonable effectively administers stainless steel electrolytic polishing waste water, realizes the resourceization, to different waste water characteristics, emission limit value, resourceization requirement, rationally selects for use joint technology, coagulation agent, reaches a plurality of targets such as investment is reasonable, the management is simple and convenient, environmental benefit is high, with low costs.
Description
Technical Field
The utility model relates to an electrolytic wastewater treatment technical field particularly, is a stainless steel electrolytic polishing waste water treatment method and device that the combined process purifies stainless steel electrolytic wastewater, realizes effectively administering and resourceful pollution.
Background
With the continuous improvement of the product quality requirement of the market, the electrolytic polishing proportion of stainless steel products is increasing day by day, the main process flows of the electrolytic polishing process comprise oil removal, water washing, rust removal, water washing, electrolytic polishing passivation, acid washing, water washing, air drying and packaging, wastewater containing high-concentration phosphorus and heavy metals such as nickel, chromium, copper and the like can be generated, the direct discharge of the wastewater can cause water body pollution and soil pollution, damage the regional ecological system, even harm the body health of surrounding residents and the like, and therefore, the electrolytic polishing wastewater has great significance for effectively treating the electrolytic polishing wastewater.
The stainless steel electrolyte is mainly prepared from sulfuric acid, phosphoric acid and glycerol according to a certain proportion, and agents such as chromic anhydride, gelatin, sodium fluoride and the like are also added according to production requirements, so that waste water discharged by cleaning is rich in pollutants such as phosphorus, nickel, chromium, copper and the like, wherein the phosphorus concentration is highest, the purification difficulty is high, standard purification is difficult to realize in one step, and an efficient and reliable combined process needs to be developed to effectively treat the stainless steel electrolyte and reduce pollutant discharge.
At present, a plurality of treatment processes are reported as single-stage coagulation sedimentation and reverse osmosis, heavy metals in treated water can stably reach the standard, but the standard reaching rate of phosphorus is low, reverse osmosis membranes are frequently blocked, and the aim of effectively treating electrolytic polishing wastewater cannot be really achieved in practical industrial application.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a stainless steel electrolytic polishing waste water purifies, retrieval and utilization technology can satisfy the stainless steel electrolytic polishing waste water treatment of different scales, quality of water, emission standard, retrieval and utilization requirement, has the stainless steel electrolytic polishing waste water treatment method and the device of investment selection flexibility, easy operation, management convenience, effect advantage such as reliable.
In order to overcome the defects in the prior art, the utility model adopts the following technical scheme:
a stainless steel electrolytic polishing wastewater treatment method comprises the following steps,
1) detecting the pH value of the wastewater, classifying according to different pH values, and putting the wastewater into different coagulating sedimentation systems; the type of the coagulating sedimentation device is reasonably selected, so that the degradation efficiency of pollutants can be effectively improved, the stability of the system is improved, and the operating cost is saved.
2) The electrolytic wastewater with the acidity pH of the original wastewater being less than 0.8 selects an acidic precipitation device and an alkaline coagulating precipitation device;
3) selecting a secondary alkaline coagulating sedimentation device for the electrolytic wastewater with the acidity and pH value of the original wastewater being more than 1.2;
4) solid-liquid separation is carried out in the coagulating sedimentation system, and the treated wastewater is subjected to advanced treatment by an RO reverse osmosis system and is discharged or recycled for reuse.
The wastewater discharge is reduced while the effective treatment and purification are realized; the aim of removing phosphorus and heavy metal step by step is achieved by different medicament adding schemes; through RO advanced treatment system, reduce the waste of water resource, also can satisfy stricter emission requirement.
Further, PAM is used as a coagulant aid and CaCl is used as a coagulant aid in the coagulating sedimentation system2PAC and a polymeric phosphorus removing agent.
Further, when the total phosphorus concentration of the wastewater exceeds 500mg/L, a polymeric phosphorus removal agent is selected as a coagulant.
Further, when the wastewater is discharged to a municipal sewage treatment plant after reaching the standard after being treated, the coagulant is CaCl2。
Furthermore, the wastewater after treatment needs to enter an RO deep purification system for deep treatment and recycling, and the coagulant is PAC.
Further, the RO reverse osmosis system comprises a pretreatment mechanism, an ultrafiltration layer and a reverse osmosis membrane, wherein the pretreatment mechanism, the ultrafiltration layer and the reverse osmosis membrane are sequentially arranged.
A stainless steel electrolytic polishing wastewater treatment device comprises a coagulating sedimentation system, a coagulating sedimentation system and an RO reverse osmosis system; the coagulating sedimentation system comprises a primary coagulating sedimentation device and a secondary coagulating sedimentation device, wherein the primary coagulating sedimentation device is connected with the secondary coagulating sedimentation device; the primary coagulation sedimentation device is sequentially provided with a reduction tank, a pH adjusting tank, a coagulation tank, a flocculation tank and a sedimentation tank, the reduction tank is connected with a wastewater collecting tank, and the sedimentation tank is connected with the secondary coagulation sedimentation device.
Reducing hexavalent chromium ions in the wastewater into trivalent chromium ions by adding a reducing agent (ferrous sulfate, sodium pyrosulfite and the like) into a reduction tank, automatically controlling the adding amount of liquid caustic soda by using a pH meter in a pH adjusting tank to enable the pH of the wastewater to be 8.0-8.5, adding a proper amount of phosphorus removing agent into a coagulation tank according to the concentration of phosphorus in the wastewater and final drainage, adding PAM into a flocculation tank, then enabling the wastewater to enter a sedimentation tank for solid-liquid separation, and enabling the effluent heavy metal pollutants of a primary coagulation sedimentation device to reach the standard and the phosphorus concentration to be not more than 10 mg/L.
Further, second grade coagulating sedimentation device is including the second grade pH equalizing basin, second grade buffer pool, second grade coagulating basin, second grade flocculation basin and the second grade sedimentation tank that connect gradually, and second grade pH equalizing basin is connected with the sedimentation tank, and the second grade sedimentation tank is connected with RO reverse osmosis system. The secondary pH adjusting tank automatically controls the adding amount of liquid caustic soda by using a pH meter to ensure that the pH of the wastewater is 9.0-9.5, the secondary buffer tank is added with a phosphorus removal agent, the secondary coagulation tank is added with PAC, the secondary flocculation tank is added with PAM, then the wastewater enters a secondary sedimentation tank for solid-liquid separation, and the effluent quality meets the sewage discharge requirement.
Further, RO reverse osmosis system includes pretreatment mechanism, ultrafiltration layer and reverse osmosis membrane, and pretreatment mechanism, ultrafiltration layer and reverse osmosis membrane place in proper order, pretreatment mechanism comprises sand filtration layer, carbon filtration layer, safety filter. The water of the secondary coagulation sedimentation device can be pumped to an RO reverse osmosis system for advanced treatment, so that the quality of the discharged water meets the water requirement of a process production line/national surface water quality IV standard.
Furthermore, a stirrer or an aerator pipe is arranged on each of the primary coagulation sedimentation device and the secondary coagulation sedimentation device, the stirrer is positioned above the primary coagulation sedimentation device and the secondary coagulation sedimentation device, and the aerator pipe is positioned at the bottom above the primary coagulation sedimentation device and the secondary coagulation sedimentation device.
Further, the secondary sedimentation tank is connected with an RO reverse osmosis system through a high-pressure water pump; the reduction pool is connected with the wastewater collecting pool through a lift pump.
The utility model provides a stainless steel electrolytic polishing waste water treatment method and device design scientific and reasonable effectively administers stainless steel electrolytic polishing waste water, realizes the resourceization, to different waste water characteristics, emission limit value, resourceization requirement, rationally selects for use joint technology, coagulation agent, reaches a plurality of targets such as investment is reasonable, the management is simple and convenient, environmental benefit is high, with low costs.
Drawings
In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive exercise according to the drawings:
FIG. 1 is a schematic view of an embodiment of a method for treating wastewater from stainless steel electrolytic polishing according to the present invention;
FIG. 2 is a schematic view of a stainless steel electrolytic polishing wastewater treatment device of the present invention;
FIG. 3 is a schematic view of a pH adjusting tank of the wastewater treatment apparatus for electrolytic polishing of stainless steel of FIG. 2;
in the drawings: 1-a coagulating sedimentation system; 10-a wastewater collecting tank; 11-a first-stage coagulating sedimentation device; 111-reduction pool; 112-pH adjusting tank; 113-a coagulation tank; 114-a flocculation tank; 115-a sedimentation tank; 12-a secondary coagulating sedimentation device; 120-secondary pH adjusting tank; 121-secondary buffer pool; 122-a secondary coagulation tank; 123-a secondary flocculation tank; 124-a secondary sedimentation tank; 13-a stirrer; 14-an aerator pipe; 2-RO reverse osmosis system; 21-a pretreatment mechanism; 211-sand screen layer; 212-a carbon filter layer; 213-cartridge filter; 22-an ultrafiltration layer; 23-reverse osmosis membrane.
Detailed Description
The present invention will be described in detail with reference to the drawings and specific embodiments, and the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.
As shown in fig. 1, 2 and 3, a method for treating wastewater from stainless steel electrolytic polishing comprises the following steps,
the secondary coagulating sedimentation system can be selected according to 2 types, wherein the 1 st type selects an acid precipitating device and an alkaline coagulating sedimentation device, and the 2 nd type selects a secondary alkaline coagulating sedimentation device. The electrolytic wastewater with larger water quality acidity (pH less than 0.8) is preferably selected from a class 1 secondary coagulating sedimentation system; the electrolytic waste water with low water quality acidity (pH is more than 1.2) is preferably selected from a type 2 secondary coagulating sedimentation system. The type of the coagulating sedimentation system is reasonably selected, so that the degradation efficiency of pollutants can be effectively improved, the stability of the system is improved, and the operating cost is saved.
The coagulant of the coagulating sedimentation system takes PAM as coagulant aid, CaCl is selected as coagulant2One or more of PAC and polymeric phosphorus removing agent are combined, and the combination is mainly determined by the discharge and reuse requirements of waste water and the concentration of phosphorus in raw water. When the total phosphorus concentration exceeds 500mg/L, the coagulant is mainly a polymeric phosphorus removal agent; when the wastewater is discharged to a municipal sewage treatment plant after reaching the standard after being treated, CaCl is selected as the coagulant2Mainly comprises the following steps of; when the wastewater needs to enter an RO deep purification system for deep treatment and recycling after treatment, PAC is mainly used as a coagulant. Reasonably selects the coagulation type according to the characteristics of the treated wastewater, achieves the purpose of pertinently treating pollutants, leads the water quality of the effluent to reach the standard, and can also create favorable conditions for advanced treatment.
The RO reverse osmosis system mainly comprises pretreatment (sand filtration, carbon filtration and cartridge filter), ultrafiltration and reverse osmosis membranes. The RO reverse osmosis system has 2 main functions in the electrolytic polishing wastewater, the 1 st is the wastewater reclamation, the produced water is recycled to the electrolytic polishing production line, and the consumption of fresh water is reduced; and 2, in the basin where part of water bodies are slightly polluted, the quality of the discharged wastewater meets the IV standard of surface water quality, and the pollution of the production of enterprises to the regional environment is ensured to be very little.
A stainless steel electrolytic polishing wastewater treatment device comprises a coagulating sedimentation system 1, a coagulating sedimentation system 1 and an RO reverse osmosis system 2; the coagulating sedimentation system 1 comprises a primary coagulating sedimentation device 11 and a secondary coagulating sedimentation device 12, wherein the primary coagulating sedimentation device 11 is connected with the secondary coagulating sedimentation device 12; the primary coagulation sedimentation device 11 is sequentially provided with a reduction tank 111, a pH adjusting tank 112, a coagulation tank 113, a flocculation tank 114 and a sedimentation tank 115, the reduction tank 111 is connected with the wastewater collecting tank 10 through a lift pump, and the sedimentation tank 115 is connected with the secondary coagulation sedimentation device 12.
Reducing agents (ferrous sulfate, sodium pyrosulfite and the like) are added into a reduction tank 111 to reduce hexavalent chromium ions in the wastewater into trivalent chromium ions, a pH adjusting tank 112 automatically controls the adding amount of liquid caustic soda by using a pH meter to enable the pH of the wastewater to be 8.0-8.5, a coagulation tank 113 adds a proper amount of phosphorus removing agent according to the concentration of phosphorus in the wastewater and final drainage, a flocculation tank 114 adds PAM, then the wastewater enters a sedimentation tank 115 to be subjected to solid-liquid separation, heavy metal pollutants in the effluent of a primary coagulation sedimentation device 11 reach the standard, and the phosphorus concentration is not more than 10 mg/L.
The effluent quality meets the requirements of the discharge Standard of pollutants for electroplating (DB 44/1597-2015); for the areas with short water resources or poor water body environment, the outlet water of the secondary coagulating sedimentation device can be pumped to a 3-RO reverse osmosis system for advanced treatment, so that the quality of the outlet water meets the water requirement of a process production line/national surface water quality IV standard. The stainless steel electrolytic wastewater reaction tank can be stirred by adopting machinery and gas so as to ensure the full reaction of the medicament.
Specifically, the second-stage coagulating sedimentation device 12 comprises a second-stage pH adjusting tank 120, a second-stage buffer tank 121, a second-stage coagulating tank 122, a second-stage flocculation tank 123 and a second-stage sedimentation tank 124 which are connected in sequence, wherein the second-stage pH adjusting tank 120 is connected with the sedimentation tank 115, and the second-stage sedimentation tank 124 is connected with the RO reverse osmosis system 2 through a high-pressure water pump. The secondary pH adjusting tank 120 automatically controls the adding amount of liquid caustic soda by using a pH meter to enable the pH of the wastewater to be 9.0-9.5, the secondary buffer tank 121 is added with a phosphorus removal agent, the secondary coagulation tank 122 is added with PAC, the secondary flocculation tank 123 is added with PAM, then the wastewater enters the secondary sedimentation tank 124 for solid-liquid separation, and the effluent quality meets the sewage discharge requirement.
Specifically, the RO reverse osmosis system 2 comprises a pretreatment mechanism 21, an ultrafiltration layer 22 and a reverse osmosis membrane 23, wherein the pretreatment mechanism 21, the ultrafiltration layer 22 and the reverse osmosis membrane 23 are sequentially arranged, and the pretreatment mechanism 21 comprises a sand filter layer 211, a carbon filter layer 212 and a security filter 213. The water of the secondary coagulation sedimentation device 12 can be sent to the RO reverse osmosis system 2 by the outlet water pump for advanced treatment, so that the quality of the outlet water meets the water requirement of the process production line/national surface water quality IV standard.
Specifically, both the primary coagulation sedimentation device 11 and the secondary coagulation sedimentation device 12 are provided with a stirrer 13 and an aerator pipe 14, the stirrer 13 is positioned above the primary coagulation sedimentation device 11 and the secondary coagulation sedimentation device 12, and the aerator pipe 14 is positioned at the bottom above the primary coagulation sedimentation device 11 and the secondary coagulation sedimentation device 12. To be precise, in the present invention, the stirrer 13 or the aeration tube 14 is used in one of the places: when the pH adjusting tank 112 automatically controls the adding amount of the liquid caustic soda by using a pH meter to ensure that the pH value of the wastewater is 8.0-8.5, in order to ensure the normal pH value and accelerate the working efficiency, the liquid caustic soda is added at one side, and the wastewater in the tank is stirred by a stirrer 13 at the other side to rapidly mix the liquid caustic soda and the wastewater; the principle of use of the aeration pipe 14 is basically the same, and generally, one of the stirrer 13 and the aeration pipe 14 is selected as the acceleration mixing in practical use.
The utility model discloses a stainless steel electrolytic polishing waste water treatment and resource technology of "second grade coagulating sedimentation + RO system", has following advantage characteristics:
flexible process combination and combination of treatment and reuse: the process combination of the utility model can be flexibly selected according to different wastewater characteristics, emission limit values and resource requirements, and the whole-flow treatment process of the utility model can be selected if the water resource is insufficient or the water environment is poor; if there is the complete region of industrial park/municipal sewage treatment plant, optional the utility model provides a second grade coagulating sedimentation system technology makes phosphorus, heavy metal pollutant in the waste water get into the sewage factory after up to standard and further administers.
Equipment modularization, operation easy maintenance: the utility model discloses three module can be divided into to the technology: the system comprises a first-level coagulating sedimentation module, a second-level coagulating sedimentation module, an RO (reverse osmosis) advanced treatment module, modular equipment, a factory standard manufacture, on-site installation and debugging, rapidness and convenience, and simple later maintenance and management.
The phosphorus removal effect is determined by the combined use of multiple multistage coagulation agents: phosphorus removal is the important factor of stainless steel electrolytic polishing wastewater, the quality of a product is determined by the using amount of phosphate in process production, so that the phosphorus concentration in the wastewater is higher, and the standard discharge of phosphorus is difficult to achieve by only using a certain phosphorus removal agent and primary coagulation precipitation; the utility model discloses a second grade coagulating sedimentation, multiple dephosphorization agent jointly use, and the control of rethread input volume makes the effect of getting rid of phosphorus in the waste water more steady more effective, guarantees to satisfy emission standard's limit value requirement.
The treatment and the resource utilization are combined, so that the operating cost is reduced: the utility model discloses technology carries out appropriate resource recycle when realizing carrying out effective, reliable processing to waste water. The secondary coagulation sedimentation ensures that the wastewater reaches the standard and is discharged; the RO advanced treatment carries out advanced treatment on the wastewater reaching the standard, and the wastewater is used as the supplementary water for the production line, so that the fresh water consumption and the wastewater discharge amount are reduced, and the environmental protection benefit of enterprises is improved.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A stainless steel electrolytic polishing wastewater treatment device comprises a coagulating sedimentation system (1), a coagulating sedimentation system (1) and an RO reverse osmosis system (2); the method is characterized in that:
the coagulating sedimentation system (1) comprises a primary coagulating sedimentation device (11) and a secondary coagulating sedimentation device (12), wherein the primary coagulating sedimentation device (11) is connected with the secondary coagulating sedimentation device (12); the primary coagulation sedimentation device (11) is sequentially provided with a reduction tank (111), a pH adjusting tank (112), a coagulation tank (113), a flocculation tank (114) and a sedimentation tank (115), the reduction tank (111) is connected with a wastewater collecting tank (10), and the sedimentation tank (115) is connected with a secondary coagulation sedimentation device (12).
2. The stainless steel electrolytic polishing wastewater treatment apparatus according to claim 1; the method is characterized in that:
the secondary coagulating sedimentation device (12) comprises a secondary pH adjusting tank (120), a secondary buffer tank (121), a secondary coagulating tank (122), a secondary flocculation tank (123) and a secondary sedimentation tank (124) which are sequentially connected, wherein the secondary pH adjusting tank (120) is connected with the sedimentation tank (115), and the secondary sedimentation tank (124) is connected with the RO reverse osmosis system (2).
3. The stainless steel electrolytic polishing wastewater treatment apparatus according to claim 1; the method is characterized in that:
RO reverse osmosis system (2) are including preliminary treatment mechanism (21), ultrafiltration layer (22) and reverse osmosis membrane (23), and preliminary treatment mechanism (21), ultrafiltration layer (22) and reverse osmosis membrane (23) are placed in proper order, preliminary treatment mechanism (21) comprise sand filtering layer (211), carbon filtering layer (212), cartridge filter (213).
4. The stainless steel electrolytic polishing wastewater treatment apparatus according to claim 2 or 3; the method is characterized in that:
the primary coagulation sedimentation device (11) and the secondary coagulation sedimentation device (12) are both provided with a stirrer (13) or an aerator pipe (14), the stirrer (13) is positioned above the primary coagulation sedimentation device (11) and the secondary coagulation sedimentation device (12), and the aerator pipe (14) is positioned at the bottom above the primary coagulation sedimentation device (11) and the secondary coagulation sedimentation device (12).
5. The stainless steel electrolytic polishing wastewater treatment apparatus according to claim 4; the method is characterized in that:
the secondary sedimentation tank (124) is connected with the RO reverse osmosis system (2) through a high-pressure water pump.
6. The stainless steel electrolytic polishing wastewater treatment apparatus according to claim 4; the method is characterized in that:
the reduction pool (111) is connected with the wastewater collecting pool (10) through a lift pump.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109987752A (en) * | 2019-05-21 | 2019-07-09 | 广州长晟环保有限公司 | A kind of stainless steel electrolytic polishing wastewater treatment method and device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109987752A (en) * | 2019-05-21 | 2019-07-09 | 广州长晟环保有限公司 | A kind of stainless steel electrolytic polishing wastewater treatment method and device |
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