CN111153564A - System and method for treating emulsion wastewater - Google Patents
System and method for treating emulsion wastewater Download PDFInfo
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Abstract
The invention discloses a treatment system and a treatment method for emulsion wastewater. The treatment system comprises a wastewater adjusting tank, an oil separator, an air floatation machine, a first pH adjusting tank, a micro-electrolysis tower, a sequencing batch Fenton oxidation tower, a second pH adjusting tank, a first coagulation tank, a first flocculation tank, a first sedimentation tank, a middle water tank, an up-flow anaerobic sludge bed reaction tower, an anoxic tank, a biological contact oxidation tank, a pre-sedimentation tank, a membrane biological reaction tank, a third pH adjusting tank, a Fenton oxidation tank, a fourth pH adjusting tank, a second coagulation tank, a second flocculation tank, a second sedimentation tank, a floating water oxidation tank and a clear water discharge tank which are sequentially connected. The treatment system for treating the emulsion wastewater has the advantages of high treatment efficiency and good effect, the effluent has no secondary pollution, the effluent can completely meet the requirement of discharge standard, and the application prospect is wide.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a treatment system and a treatment method for emulsion wastewater.
Background
The waste emulsion is mainly from oil/water mixture, hydrocarbon/water mixture or emulsion generated in the process of mechanical processing by using cutting oil and cutting fluid which are replaced by a hydraulic press regularly, and other process, mainly contains pollution factors of grease and emulsion, and has the harmful characteristic of toxicity (T). Besides the harm of common oily wastewater, the waste emulsion has the advantages that the mechanical oil is highly dispersed in water due to the action of the surfactant, the animal, plant and aquatic organisms can absorb the waste emulsion more easily, the surfactant is harmful to the organisms, and the CODcr (chemical oxygen consumption measured by using potassium dichromate as an oxidant) and the oil content concentration in the wastewater are high. The organic matter of the waste emulsion is quite complex, the COD is high, the organic matter mainly exists in the form of floating oil, and a small amount of the organic matter exists in the forms of emulsified oil and dissolved oil.
The emulsion wastewater has complex components, deep chroma, COD and BOD5The biochemical oxygen demand in five days and the salt content are high, the inhibition effect on organisms cannot be realized only by physicochemical or biochemical process treatment, and the research shows that the mass fraction of the salt (NaCl)>When the concentration is l%, the separation of the walls or the inactivation of cells can be caused, the treatment effect of the emulsion wastewater and the effluent quality are seriously influenced, and the performance of a biochemical system can be interfered when the salt mass fraction is changed by 0.5-2%. The water quality of the wastewater has great influence on microorganisms when being changed greatly, and CODcrThe removal rate of (a) is remarkably reduced.
At present, the traditional methods for treating emulsion wastewater mainly comprise physical methods (adsorption, extraction, membrane separation and the like), chemical oxidation methods (photocatalytic oxidation, supercritical water oxidation, chlorine dioxide oxidation, ultrasonic degradation, electrochemical oxidation and the like), biological methods (conventional anaerobic and aerobic treatment, pressurized biochemical treatment, high-efficiency degradation bacteria screening and separation) and the like. The waste water is easy to form slag or other impurities through simple treatment, and is easy to block, so that the subsequent waste water treatment difficulty is increased.
Disclosure of Invention
In order to overcome the problems of the emulsion wastewater treatment in the prior art, the invention aims to provide a system for treating the emulsion wastewater, and the invention aims to provide a method for treating the emulsion wastewater. The treatment system provided by the invention can be applied to the emulsion wastewater treatment of the water produced in the process of using the emulsion as the cooling liquid in the machining production process of mechanical equipment and hardware materials.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention provides a treatment system for emulsion wastewater, which comprises a wastewater adjusting tank, an oil separator, an air flotation machine, a first pH adjusting tank, a micro-electrolysis tower, a sequencing batch Fenton oxidation tower, a second pH adjusting tank, a first coagulation tank, a first flocculation tank, a first sedimentation tank, a middle water tank, an upflow anaerobic sludge bed reaction tower, an anoxic tank, a biological contact oxidation tank, a pre-sedimentation tank, a membrane biological reaction tank, a third pH adjusting tank, a Fenton oxidation tank, a fourth pH adjusting tank, a second coagulation tank, a second flocculation tank, a second sedimentation tank, a floating water oxidation tank and a clear water discharge tank which are sequentially connected.
The emulsion wastewater treatment system comprises a pretreatment unit, a biochemical treatment unit and a post-treatment unit which are connected in sequence; the pretreatment unit comprises a wastewater adjusting tank, an oil separator, an air flotation machine, a first pH adjusting tank, a micro-electrolysis tower, a sequencing batch Fenton oxidation tower, a second pH adjusting tank, a first coagulation tank, a first flocculation tank and a first sedimentation tank; the biochemical treatment unit comprises a middle water tank, an up-flow anaerobic sludge bed reaction tower, an anoxic tank, a biological contact oxidation tank, a pre-sedimentation tank and a membrane biological reaction tank; the post-treatment unit comprises a third pH adjusting tank, a Fenton oxidation tank, a fourth pH adjusting tank, a second coagulation tank, a second flocculation tank, a second sedimentation tank, a floating water oxidation tank and a clear water discharge tank.
In the emulsified liquid wastewater treatment system, an upflow anaerobic Sludge Blanket reaction tower is also called as UASB (Up-flowAnaerobic Sludge Bed/Blanket) reaction tower; the Membrane bioreactor is also called MBR (Membrane Bio-Reactor) Membrane tank.
The emulsion wastewater treated by the method is the emulsion wastewater produced in the process of machining and producing mechanical equipment and hardware materials by using the emulsion as cooling liquid. The general emulsion wastewater of machining contains the types of wastewater such as emulsion wastewater, antirust oil, grinding wastewater, machining wastewater and the like.
Preferably, in the emulsion wastewater treatment system, the first pH adjusting tank, the intermediate water tank and the third pH adjusting tank are respectively connected with the acid liquor adding device. The acid solution is common raw materials in the field, such as hydrochloric acid or sulfuric acid, and the concentration and the dosage of the acid solution can be adjusted according to actual needs, and the acid solution belongs to the conventional technology in the field.
Preferably, in the emulsion wastewater treatment system, the sequencing batch type Fenton oxidation tower and the Fenton oxidation tank are respectively connected with a hydrogen peroxide feeding device. The concentration and the dosage of the hydrogen peroxide can be adjusted according to actual needs, and the method belongs to the conventional technology in the field. The sequencing batch Fenton oxidation tower comprises at least two Fenton oxidation towers.
Preferably, in the emulsion wastewater treatment system, the second pH adjusting tank, the intermediate water tank and the fourth pH adjusting tank are respectively connected with an alkali liquor feeding device. The alkali liquor is common raw material in the field, such as sodium hydroxide solution, and the concentration and the dosage of the alkali liquor can be adjusted according to actual needs, and the alkali liquor belongs to the conventional technology in the field.
Preferably, in the system for treating the emulsion wastewater, the first pH adjusting tank, the second pH adjusting tank, the third pH adjusting tank, the fourth pH adjusting tank and the intermediate water tank are all provided with pH meters.
Preferably, in the system for treating the emulsion wastewater, the first coagulation tank and the second coagulation tank are respectively connected with a coagulant adding device. The coagulant is common raw materials in the field, such as aluminum sulfate, alum, polyaluminium chloride or ferric chloride, the dosage and the adding mode of the coagulant can be adjusted according to actual needs, and the coagulant belongs to the conventional technology in the field.
Preferably, in the system for treating the emulsion wastewater, the first flocculation tank and the second flocculation tank are respectively connected with a coagulant aid adding device. The coagulant aid is a common raw material in the field, such as polyacrylamide, and the dosage and the adding mode of the coagulant aid can be adjusted according to actual needs, and the coagulant aid belongs to the conventional technology in the field.
Preferably, in the emulsion wastewater treatment system, the floating water oxidation tank is connected with a floating water adding device. The bleaching water is a solution containing sodium hypochlorite, and belongs to common raw materials in the field.
Preferably, in the system for treating the emulsion wastewater, the sequencing batch fenton oxidation tower, the fenton oxidation pond and the floating water oxidation pond are all provided with ORP (oxidation-reduction potential) meters.
Preferably, in the system for treating the emulsion wastewater, the oil collected by the oil separator is connected with the oil collecting device through a pipeline.
Preferably, in the system for treating the emulsion wastewater, the sludge generated by the first sedimentation tank, the pre-sedimentation tank and the second sedimentation tank is respectively connected with the sludge tank through pipelines.
In the system for treating the emulsion wastewater, iron-carbon micro-electrolysis filler is filled in the micro-electrolysis tower. The micro-electrolysis tower is adopted to treat the wastewater by utilizing the electrochemical reaction of the principle of the primary battery, and the process conditions can be adjusted according to actual requirements.
The first part of the emulsion wastewater treatment system is a pretreatment unit, and the main purpose of the first part is to adopt a dual oil removal system, and oil droplets and part of emulsified oil in the emulsion are removed to the greatest extent by using an oil separator and an air floatation machine to remove oil in two stages, so that the subsequent treatment pressure is reduced; meanwhile, a micro-electrolysis primary battery reaction principle is utilized to generate high-energy oxygen free radicals and hydroxyl free radicals to play a role in strong oxidation, an improved Fenton oxidation technology is combined, the micro-electrolysis generated new ferrous ions are used as a catalyst, a proper amount of hydrogen peroxide is added to be used as an oxidant to further break macromolecular organic matters in the wastewater, part of organic matters are degraded, the biodegradability is improved, and the biodegradability can be improved to about 0.35 from 0.15.
The second part of the emulsion wastewater treatment system is a biochemical treatment unit, which is the key and core of the treatment system, and the UASB tower is used as an efficient wastewater anaerobic treatment technology, and the sludge load is up to 8-12 kg/m3D, further degrading organic matters in the water by subsequent aerobic treatment. The MBR membrane technology mainly plays two roles, namely, the concentration of aerobic sludge is improved, and water is filtered, and the microorganism in water is intercepted, so that the biochemical performance is improved.
The third part of this emulsion wastewater treatment system is a post-treatment unit. Considering that the concentration of the emulsion wastewater is particularly high and can reach 40000-50000 mg/L, after the treatment, the subsequent treatment is taken as a guarantee measure under the condition that the effluent cannot be stably discharged, so that the effluent is ensured to stably reach the standard. The treatment method mainly considers the adoption of a Fenton oxidation technology, the Fenton oxidation is an advanced oxidation technology, and because organic matters in effluent water are micromolecular organic matters and easily oxidized organic matters after the effluent water of the front section is subjected to a series of treatments, the Fenton oxidation cost-efficiency ratio is better, meanwhile, a bleaching water oxidation pool is reserved subsequently, the bleaching water oxidation is mainly adopted, the two oxidation mechanisms are different, and molecules which cannot be solved by the Fenton oxidation can be oxidized by the bleaching water oxidation.
The invention also provides a treatment method of the emulsion wastewater.
The method for treating the emulsion wastewater adopts the emulsion wastewater treatment system to treat the emulsion wastewater, and comprises the following steps:
firstly, pretreatment
Removing oil from the emulsion wastewater through an oil separator and an air flotation machine, performing micro-electrolysis treatment and Fenton oxidation, and performing coagulating sedimentation;
second, biochemical treatment
Carrying out up-flow anaerobic sludge bed reaction on the pretreated effluent, and then carrying out aerobic biological treatment and membrane bioreaction;
third, post-treatment
And performing Fenton oxidation on the effluent after biochemical treatment, performing coagulating sedimentation, and then performing bleaching oxidation, wherein the effluent is discharged after reaching the standard.
Preferably, when the treatment system is used for treating the emulsion wastewater, the Hydraulic Retention Time (HRT) of the wastewater adjusting tank is 6-24 h; HRT of the oil separator is 30-120 min; HRT of the air floatation machine is 60-180 min; HRT of the first pH adjusting tank is 20-60 min; HRT of the micro-electrolysis tower is 60 min-240 min; HRT of the sequencing batch Fenton oxidation tower is 60-240 min; HRT of the second pH adjusting tank is 20-60 min; HRT of the first coagulation tank is 20-60 min; first waddingHRT of the coagulation tank is 20-60 min; the surface load of the first sedimentation tank is 0.5m3/m2·h～1.5m3/m2H; HRT of the middle water tank is 2-6 h; HRT of the upflow anaerobic sludge blanket reaction tower is 24-72 h; HRT of the anoxic pond is 12-36 h; HRT of the biological contact oxidation pond is 12-36 h; HRT of the membrane biological reaction tank is 4-8 h; HRT of the third pH adjusting tank is 20-60 min; HRT of the Fenton oxidation pond is 60-120 min; HRT of the fourth pH adjusting tank is 20-60 min; HRT of the second coagulation tank is 20-60 min; HRT of the second flocculation tank is 20-60 min; the surface load of the second sedimentation tank is 0.5m3/m2·h～1.5m3/m2H; HRT of the bleaching water oxidation tank is 0.5-3 h; the HRT of the clear water discharge pool is 2-6 h.
Preferably, when the treatment system is used for treating the emulsion wastewater, the pH values of the wastewater are respectively adjusted to 3-4 by the first pH adjusting tank and the third pH adjusting tank.
Preferably, when the treatment system is used for treating the emulsion wastewater, the pH value of the wastewater is adjusted to 8-9 by the second pH adjusting tank and the fourth pH adjusting tank respectively.
Preferably, when the treatment system is used for emulsion wastewater treatment, acid liquor or alkali liquor is added into the intermediate water tank to adjust the pH value of the wastewater to 8-9, and then the wastewater is introduced into the upflow anaerobic sludge blanket reaction tower for anaerobic biochemical treatment.
Further, the Fenton oxidation in the pretreatment step to the modified Fenton oxidation reaction means a Fenton oxidation reaction of wastewater performed with ferrous ions generated by microelectrolysis as a catalyst and hydrogen peroxide as an oxidant. The Fenton oxidation is carried out in a sequential Fenton oxidation mode.
In the pretreatment step of the emulsion wastewater treatment method, the oil separation tank and air flotation machine dual oil removal technology is adopted as the pretreatment oil removal part of the wastewater, and the method plays a key role in removing oil drops and part of emulsified oil in the emulsion wastewater. By adopting micro-electrolysis and batch improvement Fenton oxidation technology as a pretreatment core part of the wastewater, the method plays a key role in cracking, chain scission and ring scission of macromolecular organic matters in the emulsion wastewater; meanwhile, the invention designs a sequential batch reaction mode, mainly aiming at the small amount of the wastewater of the emulsion, a batch reaction mode and a continuous mode can be adopted, the batch mode can adjust the reaction time according to the reaction result, and the method has the advantages of long and short reaction time and strong controllability.
In the biochemical treatment step of the emulsion wastewater treatment method, the UASB tower technology plays a key role in cracking, chain scission and ring scission of macromolecular organic matters in the emulsion wastewater; the aerobic and MBR membrane technology also plays a main role in decomposing and thoroughly removing organic matters in the emulsion wastewater.
In the post-treatment step of the emulsion wastewater treatment method, the subsequent Fenton oxidation and rinsing water reserved oxidation technologies are used as the subsequent dual-guarantee treatment technologies of the wastewater, so that the method plays an essential role in treating whether the emulsion wastewater can stably reach the standard.
The invention has the beneficial effects that:
the treatment system for treating the emulsion wastewater has the advantages of high treatment efficiency and good effect, the effluent has no secondary pollution, the effluent can completely meet the requirement of discharge standard, and the application prospect is wide.
Compared with the prior art, the invention has the advantages of perfect process, simple core, convenient design and quick treatment. The concentration range of the degraded emulsion wastewater is wide, and the treatment time can be flexibly adjusted according to different wastewater concentrations.
Drawings
FIG. 1 is a schematic diagram of an emulsion wastewater treatment system.
Reference numerals: 1-a wastewater adjusting tank; 2-oil separator; 3-an air floatation machine; 4-a first pH adjusting tank; 5-a micro-electrolysis tower; 6-sequencing batch Fenton oxidation tower; 7-a second pH adjusting tank; 8-a first coagulation tank; 9-a first flocculation tank; 10-a first sedimentation tank; 11-intermediate water pool; 12-upflow anaerobic sludge blanket reaction tower; 13-anoxic tank; 14-biological contact oxidation pond; 15-a pre-sedimentation tank; 16-a membrane biological reaction tank; 17-a third pH adjusting tank; 18-a Fenton oxidation pond; 19-a fourth pH adjusting tank; 20-a second coagulation tank; 21-a second flocculation tank; 22-a second sedimentation tank; 23-a floating water oxidation pond; 24-a clear water discharge tank; 25-acid liquor feeding device; 26-a hydrogen peroxide adding device; 27-an alkali liquor feeding device; 28-a coagulant adding device; 29-coagulant aid adding device; 30-a floating water adding device; 31-an oil collector; 32-sludge pool.
Detailed Description
FIG. 1 is a schematic diagram of an emulsion wastewater treatment system of the present invention. The present invention will be described in further detail with reference to fig. 1 by way of specific examples. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The starting materials, reagents or apparatus used in the examples are all conventionally commercially available unless otherwise specified; the detection method of the wastewater quality is a conventional or well-known method in the field.
Example of emulsion wastewater treatment System
Referring to fig. 1, an embodiment of an emulsion wastewater treatment system includes a wastewater adjusting tank 1, an oil separator 2, an air flotation machine 3, a first pH adjusting tank 4, a micro-electrolysis tower 5, a sequencing batch fenton oxidation tower 6, a second pH adjusting tank 7, a first coagulation tank 8, a first flocculation tank 9, a first sedimentation tank 10, a middle water tank 11, an upflow anaerobic sludge bed reaction tower 12, an anoxic tank 13, a biological contact oxidation tank 14, a pre-sedimentation tank 15, a membrane biological reaction tank 16, a third pH adjusting tank 17, a fenton oxidation tank 18, a fourth pH adjusting tank 19, a second coagulation tank 20, a second flocculation tank 21, a second sedimentation tank 22, a floating water oxidation tank 23, and a clear water discharge tank 24, which are connected in sequence.
The emulsion treatment system comprises a pretreatment unit, a biochemical treatment unit and a post-treatment unit which are connected in sequence; the pretreatment unit comprises a wastewater adjusting tank 1, an oil separator 2, an air flotation machine 3, a first pH adjusting tank 4, a micro-electrolysis tower 5, a sequencing batch Fenton oxidation tower 6, a second pH adjusting tank 7, a first coagulation tank 8, a first flocculation tank 9 and a first sedimentation tank 10; the biochemical treatment unit comprises a middle water tank 11, an up-flow anaerobic sludge bed reaction tower 12, an anoxic tank 13, a biological contact oxidation tank 14, a pre-sedimentation tank 15 and a membrane biological reaction tank 16; the post-treatment unit comprises a third pH adjusting tank 17, a Fenton oxidation tank 18, a fourth pH adjusting tank 19, a second coagulation tank 20, a second flocculation tank 21, a second sedimentation tank 22, a floating water oxidation tank 23 and a clear water discharge tank 24.
In the system for treating emulsion wastewater of this embodiment, the first pH adjusting tank 4, the intermediate water tank 11 and the third pH adjusting tank 17 are respectively connected to an acid solution adding device 25. The acid liquid adding device can be a hydrochloric acid/sulfuric acid adding device.
In the system for treating emulsion wastewater of this embodiment, the second pH adjusting tank 7, the intermediate water tank 11 and the fourth pH adjusting tank 19 are respectively connected to an alkali liquor feeding device 27. The alkali liquor adding device can be a sodium hydroxide solution adding device.
In the system for treating emulsion wastewater of this embodiment, the first pH adjusting tank 4, the second pH adjusting tank 7, the third pH adjusting tank 17, the fourth pH adjusting tank 19 and the intermediate water tank 11 are all provided with pH meters, which can be used for monitoring the pH value of wastewater in the tanks in real time.
In this example, in the system for treating emulsion wastewater, the sequencing batch fenton oxidation tower 6 and the fenton oxidation pond 18 are respectively connected to a hydrogen peroxide feeding device 26. The sequencing batch type fenton oxidation tower 6 includes two fenton oxidation towers, such as a fenton oxidation tower a and a fenton oxidation tower B. The Fenton oxidation tower A and the Fenton oxidation tower B are arranged in parallel, the effluent of the micro-electrolysis tower 5 is respectively introduced into the Fenton oxidation tower A and the Fenton oxidation tower B for Fenton oxidation treatment, and the effluent of the Fenton oxidation tower A and the Fenton oxidation tower B is respectively introduced into the second pH adjusting tank 7.
In this example, the floating water oxidation tank 23 is connected to a floating water adding device 30. The bleaching water is common industrial bleaching water.
In the system for treating emulsion wastewater of this embodiment, the sequencing batch type fenton oxidation tower 6, the fenton oxidation pond 18 and the floating water oxidation pond 30 are all provided with OPR meters, which can be used for monitoring the oxidation-reduction potential of wastewater in the ponds in real time.
In the system for treating emulsion wastewater of this embodiment, the first coagulation tank 8 and the second coagulation tank 20 are respectively connected to a coagulant adding device 28. The coagulant adding device can be a polyaluminium chloride (PAC) adding device.
In this example, in the system for treating emulsion wastewater, the first flocculation tank 9 and the second flocculation tank 21 are respectively connected to a coagulant aid adding device 29. The coagulant aid adding device can be a Polyacrylamide (PAM) adding device.
In this example, the oil collected by the oil separator 2 is connected to the oil collector 31 through a pipe.
In this example of the emulsion wastewater treatment system, the sludge generated in the first sedimentation tank 10, the pre-sedimentation tank 15, and the second sedimentation tank 22 is connected to the sludge tank 32 through pipes, respectively. And conveying the sludge to a sludge tank for treatment, such as concentration, stabilization, dehydration, drying and the like.
Application example 1 of emulsion wastewater treatment system
The emulsion wastewater treatment system of the above embodiment is used to treat a water sample including emulsion wastewater from a certain company, and the raw water quality parameters are shown in table 1.
Table 1 application example 1 raw water quality parameters
| Water inflow index | pH | Conductivity (μ s/cm) | SS(mg/L) | CODcr(mg/L) | Ammonia nitrogen (mg/L) | Total phosphorus (mg/L) |
| Emulsion waste water | ～9 | 4090 | ≤500 | ≤130000 | ≤1000 | ≤200 |
| Rust preventive oil A | ～8 | 1373 | ≤500 | ≤20000 | ≤1000 | ≤70 |
| Rust preventive oil B | ～8 | 3190 | ≤500 | ≤20000 | ≤1000 | ≤40 |
| Grinding waste water | ～8 | 2860 | ≤500 | ≤20000 | ≤20 | ≤20 |
| Waste water of mechanical processing | ～7 | 912 | ≤500 | ≤10000 | ≤600 | ≤100 |
| Mixing waste water samples | ～7 | 4.6 | ≤500 | ≤20000 | ≤1000 | ≤200 |
The mixed wastewater sample in table 1 is a water sample obtained by mixing emulsion wastewater, anti-rust oil A, anti-rust oil B, grinding wastewater and machining wastewater, and the mixed wastewater is used as an influent water sample for treatment, wherein the treatment method comprises the following steps:
firstly, pretreatment
Introducing the emulsion wastewater into a wastewater adjusting tank and staying for 8-24 h; introducing the effluent of the wastewater adjusting tank into an oil separator for treatment, wherein the HRT is 40-120 min; the effluent of the oil separator is introduced into an air flotation machine for oil removal, and the HRT is 60-120 min; introducing the effluent of the air flotation machine into a first pH adjusting tank, adding acid to adjust the pH value of the wastewater to 3-4, and adjusting the HRT for 20-40 min; introducing the effluent of the first pH regulating tank into a micro-electrolysis tower for micro-electrolysis treatment, wherein the HRT is 90-120 min; introducing the effluent of the micro-electrolysis tower into a sequencing batch Fenton oxidation tower for treatment, and respectively carrying out improved Fenton oxidation reaction by two Fenton oxidation towers with HRT of 120-240 min; introducing the effluent of the sequencing batch Fenton oxidation tower into a second pH adjusting tank, and adding hydrogenAdjusting the pH value of the wastewater to 8-9 by using a sodium oxide solution, wherein the HRT is 20-40 min; introducing the effluent of the second pH adjusting tank into the first coagulation tank, adding polyaluminium chloride, mixing with the wastewater, and performing coagulation treatment with HRT of 20-40 min; introducing the effluent of the first coagulation tank into a first flocculation tank, adding polyacrylamide to mix with the wastewater, and performing coagulation treatment with HRT of 20-40 min; the effluent of the first flocculation tank is introduced into a first sedimentation tank for sedimentation treatment, and the surface load is 0.5-1.25m3/m2·h。
Second, biochemical treatment
Introducing the effluent of the first sedimentation tank into an intermediate water tank, adding acid liquor or alkali liquor to adjust the pH value of the wastewater to 8-9, wherein the HRT is 2-6 h; introducing the effluent of the intermediate pool into a UASB tower to perform upflow anaerobic sludge blanket reaction, wherein HRT is 18-48 h; introducing effluent of the UASB tower into an anoxic tank for treatment, wherein HRT is 8-18 h; introducing the effluent of the anoxic tank into a biological contact oxidation tank for treatment, wherein the HRT is 12-36 h; the effluent of the biological contact oxidation tank is introduced into a pre-sedimentation tank for sedimentation treatment, and the surface load is 0.5-1.25m3/m2H; and (4) introducing the effluent of the pre-sedimentation tank into a membrane biological reaction tank for MBR membrane treatment, wherein the HRT is 4-8 h.
Third, post-treatment
Introducing the effluent of the membrane biological reaction tank into a third pH adjusting tank, adding acid to adjust the pH value of the wastewater to 3-4, and adjusting the HRT to 40 min; introducing the effluent of the third pH adjusting tank into a Fenton oxidation tank, adding hydrogen peroxide to carry out Fenton oxidation reaction with the wastewater, wherein the HRT is 80 min; introducing the effluent of the Fenton oxidation tank into a fourth pH adjusting tank, adding a sodium hydroxide solution to adjust the pH value of the wastewater to 8-9, and adjusting the HRT for 40 min; introducing the effluent of the fourth pH adjusting tank into a second coagulation tank, adding polyaluminium chloride, mixing with the wastewater, and performing coagulation treatment with HRT of 40 min; introducing the effluent of the second coagulation tank into a second flocculation tank, adding polyacrylamide to mix with the wastewater, and performing coagulation treatment with HRT of 40 min; the effluent of the second flocculation tank is introduced into a second sedimentation tank for sedimentation treatment, and the surface load is 1m3/m2H; introducing the effluent of the second sedimentation tank into a reserved bleaching water oxidation tank, adding bleaching water and wastewater for oxidation treatment, wherein the HRT is 1 h; the effluent of the bleaching water oxidation tank is introduced into a clear water discharge tank, the HRT is 3h, and the effluent can reach the standard after detectionDirectly discharged outside or discharged to a municipal sewage plant for treatment.
The oil collected by the oil separator is conveyed to an oil collecting device for storage treatment. And sludge generated by the first sedimentation tank, the pre-sedimentation tank and the second sedimentation tank is discharged to a sludge tank for treatment.
The detection shows that the quality of the effluent water of the wastewater treated by the method can reach the first-level standard of 'local standard of Guangdong province-water pollutant discharge limit' (DB 44/26-2001), and the parameters of the discharge water quality can be shown in Table 2.
TABLE 2 parameters of the discharge Water quality
| Index of water discharge | pH | SS(mg/L) | CODcr(mg/L) | BOD5(mg/L) | Ammonia nitrogen (mg/L) | Total phosphorus (mg/L) |
| |
6～9 | ≤60 | ≤90 | ≤20 | ≤15 | ≤0.5 |
Application example 2 of emulsion wastewater treatment system
Using the treatment system of the above example, a company using cutting oil and cutting fluid for machining processes produces oil/water, hydrocarbon/water mixture, or emulsified emulsion wastewater. The results of measuring the raw material components of the emulsion waste water of this example are shown in Table 3.
Table 3 application example 2 emulsion wastewater composition test results
The method for treating the emulsion wastewater in this example was the same as in application example 1. The detection shows that the quality of the effluent of the wastewater treated by the method can reach the first-grade standard of local standard 'water pollutant discharge limit' of Guangdong province (DB 44/26-2001).
Application example 3 of emulsion wastewater treatment system
Using the treatment system of the above example, a company's waste oil/water, hydrocarbon/water mixture, or emulsified emulsion wastewater was treated. The results of measuring the raw material components of the emulsion waste water of this example are shown in Table 4.
Table 4 application example 3 emulsion wastewater component detection results
The method for treating the emulsion wastewater in this example was the same as in application example 1. The detection shows that the quality of the effluent of the wastewater treated by the method can reach the first-level standard of 'local standard of Guangdong province-water pollutant emission limit' (DB 44/26-2001).
Comparative application example
The existing method for treating the emulsion wastewater comprises the following main treatment processes:
(1) waste emulsion raw water → regulating reservoir 1 → UF ultrafiltration → intermediate reservoir 1.
(2) The middle water tank 1 → the fenton device → the middle water tank 2 → the ceramic membrane filter device → the comprehensive regulation tank → the IC tower → the contact oxidation tank → the MBR tank → the RO device → the clean water tank.
The prior art adopts membrane filtration before, and other processing techniques are after, and the risk that this technique exists is very easily blockked up the membrane filtration of anterior segment, leads to the system collapse. In actual operation, the UF ultrafiltration system is blocked when the UF ultrafiltration system is operated for less than 3 months, cannot be used for a long time, is easy to cause waste, and increases the treatment cost.
Compared with the prior art, the treatment system for treating the emulsion wastewater has the advantages of perfect process, simple core, convenient design, rapid treatment and degradation efficiency of more than 98 percent. The concentration of the degraded emulsion wastewater can be from low concentration to high concentration; the treatment time can be flexibly adjusted according to different concentrations of the wastewater. The emulsion wastewater treatment system has wide market prospect, and can be applied to the emulsion wastewater treatment of the water produced in the process of using the emulsion as the cooling liquid in the machining production process of mechanical equipment and hardware materials.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. A processing system of emulsion waste water which characterized in that: the treatment system comprises a wastewater adjusting tank, an oil separator, an air floatation machine, a first pH adjusting tank, a micro-electrolysis tower, a sequencing batch Fenton oxidation tower, a second pH adjusting tank, a first coagulation tank, a first flocculation tank, a first sedimentation tank, a middle water tank, an up-flow anaerobic sludge bed reaction tower, an anoxic tank, a biological contact oxidation tank, a pre-sedimentation tank, a membrane biological reaction tank, a third pH adjusting tank, a Fenton oxidation tank, a fourth pH adjusting tank, a second coagulation tank, a second flocculation tank, a second sedimentation tank, a floating water oxidation tank and a clear water discharge tank which are sequentially connected.
2. The processing system of claim 1, wherein: the first pH adjusting tank, the middle water tank and the third pH adjusting tank are respectively connected with an acid liquor feeding device.
3. The processing system of claim 1, wherein: and the sequencing batch Fenton oxidation tower and the Fenton oxidation pond are respectively connected with a hydrogen peroxide feeding device.
4. The processing system of claim 1, wherein: and the second pH adjusting tank, the middle water tank and the fourth pH adjusting tank are respectively connected with an alkali liquor feeding device.
5. The processing system of claim 1, wherein: the first coagulation tank and the second coagulation tank are respectively connected with a coagulant adding device.
6. The processing system of claim 1, wherein: and the first flocculation tank and the second flocculation tank are respectively connected with a coagulant aid adding device.
7. The processing system of claim 1, wherein: the floating water oxidation tank is connected with a floating water feeding device.
8. The processing system of claim 1, wherein: the oil collected by the oil separator is connected with an oil collecting device through a pipeline.
9. The processing system of claim 1, wherein: and the sludge generated by the first sedimentation tank, the pre-sedimentation tank and the second sedimentation tank is respectively connected with the sludge tank through pipelines.
10. A method for treating emulsion wastewater is characterized by comprising the following steps: use of the treatment system of any one of claims 1 to 9 for emulsion wastewater treatment, comprising the steps of:
firstly, pretreatment
Removing oil from the emulsion wastewater through an oil separator and an air flotation machine, performing micro-electrolysis treatment and Fenton oxidation, and performing coagulating sedimentation;
second, biochemical treatment
Carrying out up-flow anaerobic sludge bed reaction on the pretreated effluent, and then carrying out aerobic biological treatment and membrane bioreaction;
third, post-treatment
And performing Fenton oxidation on the effluent after biochemical treatment, performing coagulating sedimentation, and then performing bleaching oxidation, wherein the effluent is discharged after reaching the standard.
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