CN209974534U - Water based paint effluent disposal system - Google Patents
Water based paint effluent disposal system Download PDFInfo
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- CN209974534U CN209974534U CN201920455502.1U CN201920455502U CN209974534U CN 209974534 U CN209974534 U CN 209974534U CN 201920455502 U CN201920455502 U CN 201920455502U CN 209974534 U CN209974534 U CN 209974534U
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Abstract
The utility model discloses a water-based paint wastewater treatment system, which comprises a physicochemical treatment system, a membrane separation system and a biological treatment system which are connected in sequence, wherein the physicochemical treatment system is used for removing resin and pigment in the wastewater and preliminarily reducing the chemical oxygen demand of the wastewater; the membrane separation system is used for further reducing the chemical oxygen demand of the wastewater from the physicochemical treatment system so as to meet the biochemical treatment load requirement of the biological treatment system; biological treatment systems are used to further reduce the chemical oxygen demand of the wastewater from the membrane separation system. The utility model discloses a set up membrane separation system before biological treatment system, reduce the COD of water based paint waste liquid in advance to make pending waste liquid satisfy biological treatment system's processing load requirement, make biological treatment system can effective processing waste liquid, reduce COD, reach nano-tube emission standard, obtain stable treatment, and the running cost is low.
Description
Technical Field
The utility model belongs to the technical field of waste water treatment, in particular to water based paint effluent disposal system.
Background
In recent years, as water-based paint products enter the market, corresponding waste water problems begin to be exposed at the same time, the paint industry mainly generates waste water in the processes of washing reactors or painting and the like, the water-based paint waste liquid is characterized by small water quantity and high Chemical Oxygen Demand (hereinafter referred to as COD), the treatment process is still in a discussion stage, and the treatment process of waste water generated by traditional paint enterprises is as follows: the method comprises the steps of waste water separation, coagulation, neutralization and precipitation, air floatation, biological method, sand filtration, activated carbon adsorption, discharge and recovery, however, part of water-based coating waste water cannot meet the process due to high COD, and even dilution treatment is required to meet the requirements or is directly used as hazardous waste for outsourcing treatment.
The general water paint waste water mainly contains organic matters such as resin, solvent, auxiliary agent, pigment and the like, and COD exceeds 100000 mg/L. The existing water-based paint wastewater treatment methods are only suitable for paint wastewater with low-concentration COD, and paint wastewater exceeding 100000mg/L is difficult to treat by using a traditional method. Patent documents CN207361992U, CN102583877A and CN108264194A all provide a set of solution for physicochemical treatment and biochemical treatment, and the purpose of coagulation is designed according to experience, resin and pigment are mainly removed, advanced oxidation technology or anaerobic organism is designed to mainly treat the solvent in the wastewater to reduce COD load and improve biodegradability, and aerobic, contact oxidation or membrane bioreactor is designed to mainly utilize microorganisms to metabolize or adsorb and oxidize the organic matters in the wastewater, thereby meeting the discharge requirement. However, in the water-based coating wastewater with high concentration of COD, the COD still exceeds 100000mg/L after coagulation, anaerobic microorganisms cannot adapt to such high water inflow load, and the economic cost of operation by adopting the advanced oxidation technology is very high, so that the treatment of the water-based coating wastewater cannot be realized.
In view of the above, there is a need for a treatment system for reducing the COD of coagulated wastewater by a pretreatment process to a value acceptable for biochemical treatment or operation cost of advanced oxidation, so as to overcome the above-mentioned problems of the prior art.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problems that the treatment difficulty is higher and the treatment load requirement cannot be met when the high-COD water-based paint wastewater is directly subjected to biochemical treatment in the prior art,
the utility model discloses a water-based paint wastewater treatment system, which comprises a physicochemical treatment system, a membrane separation system and a biological treatment system;
the physicochemical treatment system is used for removing resin and pigment in the wastewater and primarily reducing the COD of the wastewater;
the membrane separation system is used for further reducing the COD of the wastewater from the physicochemical treatment system so as to meet the biochemical treatment load requirement of the biological treatment system;
the biological treatment system is used for further reducing COD of the wastewater from the membrane separation system;
the physicochemical treatment system, the membrane separation system and the biological treatment system are communicated in sequence through pipelines.
Further, the materialization treatment system comprises a water collecting tank, a pH adjusting tank, a coagulation reaction tank and a solid-liquid separator which are sequentially connected through pipelines.
Further, the solid-liquid separator is a sedimentation tank or a plate-and-frame filter press. When a sedimentation tank is selected, a supernatant outlet of the sedimentation tank is connected with a liquid inlet of the membrane separation system, sludge precipitated by the substrate is pumped out by a sludge pump and enters the subsequent sludge dehydration treatment, and the removed water can be circularly treated; when a plate-and-frame filter press is selected, the filtered liquid enters a membrane separation system, and the generated solid residue does not need to be dehydrated due to good dehydration effect.
Further, the physicochemical treatment system also comprises a dosing system, and the dosing system is used for adding a pH regulator into the pH regulating tank and adding a coagulant and a flocculating agent into the coagulation reaction tank.
Further, the membrane separation system comprises a water tank with a heating device, a membrane component, a vacuum pump, a condensing device and an intermediate water tank,
a water tank waste water inlet of the heating device is connected with a separation liquid outlet of the solid-liquid separator, and a water tank waste water outlet of the heating device is connected with a membrane component waste water inlet;
the membrane module is provided with a hydrophilic selective permeable membrane, and a steam outlet of the membrane module is connected with a steam inlet of the condensing device;
the vacuum pump is used for vacuumizing the membrane permeation side of the membrane component to form a negative pressure environment;
the condensed water outlet of the condensing device is connected with the water inlet of the middle water tank.
Waste water in the water tank is lifted to the membrane component to be in contact with one side of the membrane through the lifting pump, and the membrane in the membrane component can preferentially separate steam to the membrane permeation side under the continuous negative pressure action of the membrane permeation side, so that organic matters of the waste water are left, and COD in the waste water is rapidly reduced.
Further, the hydrophilic permselective membrane is a polyvinyl alcohol (PVA) film.
Further, the heat source of the heating device is the waste heat of a factory boiler.
Further, the biological treatment system comprises an upflow anaerobic Sludge Blanket (Up-flow anaerobic Sludge Bed/Blanket, hereinafter referred to as UASB) Reactor and a Membrane bioreactor (Membrane Bio-Reactor, hereinafter referred to as MBR) which are connected in sequence through pipelines.
Waste water in the middle water tank is lifted to a UASB reactor by a pump, sludge in the reactor is special particles or flocculent sludge and has better COD removal capacity, effluent directly enters the MBR reactor, aeration is arranged in the reactor to further degrade COD in the waste water, and the effluent is sucked out by an inner membrane component of the MBR reactor.
Further, the device also comprises a sludge pump and a plate-and-frame filter press, wherein solid phase discharge ports of the materialization treatment system and the biological treatment system are connected with a pipeline of the plate-and-frame filter press through the sludge pump, and a filtrate outlet of the plate-and-frame filter press is connected with a wastewater inlet of the materialization treatment system. This allows spent liquor that has not been effectively treated in the process to be recycled to the sump for re-treatment. The solid waste produced after dehydration can be further processed or disposed of ex-tro.
The application method of the water-based paint wastewater treatment system comprises the following steps:
s1: in the physical and chemical treatment stage, the resin and the pigment in the wastewater are removed in a physical and chemical treatment and precipitation forming mode;
s2: a membrane separation stage, wherein the wastewater discharged from the physicochemical treatment stage is subjected to membrane separation so as to meet the biochemical treatment load requirement of a biological treatment system;
s3: a biological treatment stage for treating the wastewater from the membrane separation stage by biological treatment.
Further, the materialization processing stage S1 specifically includes the following steps:
s11: introducing the water-based paint wastewater in the water collecting tank into a pH adjusting tank, and adding a pH value regulator to adjust the pH value;
s12: and introducing the wastewater with the pH value adjusted into a coagulation reaction tank, adding a coagulant into the coagulation reaction tank, and carrying out coagulation reaction under stirring. At this stage, the stirring speed is relatively high, and turbulence is formed in the coagulation reaction tank to promote mixing and reaction. Adding a flocculating agent after the full reaction, stirring at a relatively slow speed, and performing the full flocculation reaction to form alum floc;
s13: and (3) carrying out solid-liquid separation on the wastewater mixed with the alum floc, and carrying out subsequent treatment on the separated liquid.
Further, S13 specifically includes: the wastewater mixed with the alum floc is freely settled in a sedimentation tank, and the supernatant enters the subsequent treatment step;
or introducing the wastewater mixed with the alum floc into a plate-and-frame filter press for solid-liquid separation, and introducing the separated liquid into the subsequent treatment step.
Further, in step S11, the pH adjusting agent includes sodium hydroxide and/or sulfuric acid and/or hydrochloric acid, and the target value of pH adjustment is 8-9;
further, in step S12, the coagulant is polyaluminum chloride (hereinafter abbreviated as PAC) and the flocculant is polyacrylamide (hereinafter abbreviated as PAM).
Further, the membrane separation stage specifically comprises the steps of:
s21: introducing the wastewater from the physicochemical treatment stage into a water tank with a heating device for heating;
s22: carrying out membrane separation on the heated wastewater through a membrane component provided with a hydrophilic selective permeable membrane to separate steam;
s23: the separated steam is condensed in a condensing device and introduced into an intermediate water tank.
Further, in S21, the heat source of the heating device is the waste heat of a factory boiler, the heating temperature is 30-70 ℃, and the energy consumption is reduced as much as possible while the evaporation effect is ensured; in S23, the condensation temperature is 0-5 ℃, and the excessive temperature can reduce the condensation effect and influence the water yield.
Further, the biological treatment stage comprises the steps of: wastewater from the membrane separation system is subjected to biological treatment in a UASB reactor and an MBR in sequence. As the COD requirement of the MBR on the feed liquor is strict, especially when the COD of the feed liquor is higher than 5000mg/L, the feed liquor is not suitable to directly enter the MBR for aerobic biological treatment. Therefore, the wastewater (COD is more than 10000mg/L generally) from the membrane separation system is reasonably designed to enter the UASB reactor for anaerobic biological treatment.
Further, the sludge in the UASB reactor is special particle or flocculent sludge, and the sludge concentration in the MBR is maintained to be more than 6000 mg/L. In this concentration range, the problem of low treatment efficiency due to too low a sludge concentration can be prevented.
Further, solid phases generated in the physical and chemical treatment stage and the biological treatment stage are conveyed to a plate-and-frame filter press through a sludge pump for solid-liquid separation, and separated liquid is conveyed to a water collecting tank. This allows spent liquor that has not been effectively treated in the process to be recycled to the sump for re-treatment.
Compared with the prior art, the utility model provides a technical scheme has following advantage:
firstly, aiming at the water-based paint wastewater with high-concentration COD, the utility model arranges a membrane separation system in front of a biological treatment system to reduce the COD of the water-based paint wastewater in advance, thereby leading the wastewater to be treated to meet the treatment load requirement of the biological treatment system, leading the biological treatment system to effectively treat the wastewater, reducing the COD, reaching the nano-tube discharge standard, obtaining stable treatment effect and having low operation cost;
secondly, the utility model adopts the PVA film material with better water permeability to realize the reduced pressure distillation of the wastewater and quickly reduce COD, so that the wastewater reaches the water inlet index which can be treated by a biochemical method;
third, the utility model discloses utilize the waste heat to carry out the membrane distillation, distillation temperature is lower, when reducing the potential safety hazard the energy consumption quantity that has significantly reduced, realizes energy saving and emission reduction, green circulation.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the apparatus and method in accordance with the invention and, together with the detailed description, serve to explain the advantages and principles of the invention. In the drawings:
FIG. 1 is a schematic diagram of an aqueous coating wastewater treatment system.
Description of the reference numerals
1-a water collecting tank, 2-a pH adjusting tank, 3-a coagulation reaction tank, 4-a sedimentation tank, 5-a dosing system, 6-a water tank with a heating device, 7-a membrane component, 8-a vacuum pump, 9-a condensing device, 10-an intermediate water tank, 11-a UASB reactor, 12-an MBR reactor, 13-a sludge pump, 14-a plate and frame filter press
Detailed Description
The following detailed description of the embodiments of the present invention refers to the accompanying drawings. However, the present invention is not limited to the embodiments described below. In addition, the technical features related to the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other, and the technical idea of the present invention may be combined with other known techniques or other techniques similar to those known techniques.
Example 1
The embodiment 1 of the utility model provides a water based paint effluent disposal system, including materialization processing system, membrane separation system, biological treatment system, materialization processing system, membrane separation system, biological treatment system communicate through the pipeline in proper order.
The materialization treatment system is used for removing resin and pigment in the wastewater and primarily reducing the COD of the wastewater.
The physicochemical treatment system specifically comprises a water collecting tank 1, a pH adjusting tank 2, a coagulation reaction tank 3 and a solid-liquid separator which are sequentially connected by pipelines.
In this embodiment, the solid-liquid separator is a sedimentation tank 4.
The physicochemical treatment system also comprises a medicine adding system 5, wherein the medicine adding system 5 is used for adding a pH regulator into the pH regulating tank 2 and adding a coagulant PAC and a flocculant PAM into the coagulation reaction tank 3.
The membrane separation system is used for further reducing the COD of the wastewater from the physicochemical treatment system so as to meet the biochemical treatment load requirement of the biological treatment system.
The membrane separation system comprises a water tank 6 with a heating device, a membrane module 7, a vacuum pump 8, a condensing device 9 and an intermediate water tank 10.
A water tank waste water inlet of the heating device is connected with a separation liquid outlet of the solid-liquid separator, and a water tank waste water outlet of the heating device is connected with a waste water inlet of the membrane component 7.
The steam outlet of the membrane component 7 is connected with the steam inlet of the condensing device 9.
The vacuum pump 8 is used to draw a vacuum on the membrane permeation side of the membrane module 7 to form a negative pressure environment.
The condensed water outlet of the condensing device 9 is connected with the water inlet of the middle water tank 10.
In this embodiment, the membrane module 7 is equipped with a hydrophilic permselective membrane which is a PVA membrane.
In this embodiment, the heat source of the heating device is the waste heat of a factory boiler.
Biological treatment systems are used to further reduce the COD of the wastewater from the membrane separation system.
The biological treatment system comprises a UASB reactor 11 and an MBR reactor 12 which are connected in sequence through pipelines. The wastewater in the intermediate water tank 10 is lifted into a UASB reactor 11 by a pump, the sludge in the reactor is special particle or flocculent sludge and has better COD removal capability, the effluent directly enters an MBR reactor 12, aeration is arranged in the reactor to further degrade COD in the wastewater, and the effluent is pumped out by a membrane component 7 in the MBR reactor 12.
Therefore, through the treatment of the treatment system, the COD of the water-based paint wastewater can be effectively reduced, and the nano-tube discharge standard is reached. Meanwhile, certain economical efficiency and system stability can be ensured.
Example 2
The embodiment 2 of the utility model provides a water based paint effluent disposal system, compare in above-mentioned embodiment 1, embodiment 2 is still including sludge pump 13 and the filter press 14 that is used for sludge treatment, and 4 sedimentary bottoms of sedimentation tank mud and UASB reactor 11, MBR reactor 12's solid phase discharge port all pass through sludge pump 13 and 14 tube coupling of filter press, and the filtrating export of filter press 14 links to each other with the waste water import of catch basin 1. This allows spent liquor that has not been effectively treated during the process to be recycled to the sump 1 for re-treatment.
Example 3
The embodiment 3 of the utility model provides a water based paint effluent disposal system, compare in above-mentioned embodiment 1, 2, the solid-liquid separator who adopts in embodiment 3 is filter press 14. Namely, the sedimentation tank 4 is omitted, and the filtrate outlet of the plate-and-frame filter press 14 is connected with the water tank 6 with a heating device in the membrane separation system. And the solid discharge port does not need to be further dehydrated. The plate-and-frame filter press 14 as the solid-liquid separator is different from the plate-and-frame filter press 14 that receives and processes the sludge in the UASB reactor 11 and the MBR reactor 12.
Example 1 method for using the water-based paint wastewater treatment system, aiming at the water-based paint wastewater generated in a paint shop of an automobile factory, the COD is about 500000mg/L, and after the water-based paint wastewater treatment system of the example 1, the COD is lower than 500 mg/L. The method comprises the following steps:
s1: in the physical and chemical treatment stage, the resin and the pigment in the wastewater are removed in a physical and chemical treatment and precipitation forming mode;
the S1 concrete steps are:
s11: introducing the water-based coating wastewater in the water collecting tank 1 into a pH adjusting tank 2, adding a pH value regulator to adjust the pH value, and adjusting the pH value to 8-9; the pH regulator may be one or more of sodium hydroxide, sulfuric acid and hydrochloric acid.
S12: and introducing the wastewater with the adjusted pH value into a coagulation reaction tank 3, adding a coagulant PAC into the coagulation reaction tank 3, and carrying out coagulation reaction under stirring. At this stage, the stirring speed is relatively high (e.g. 100r/min), and turbulence is formed in the coagulation reaction tank 3 to promote mixing and reaction. Adding PAM flocculant after full reaction, stirring at a relatively slow speed (such as 30r/min), and performing full flocculation reaction under stirring to form floc;
s13: and (3) performing free settling in the wastewater sedimentation tank 4 mixed with the alum floc, performing solid-liquid separation, and allowing the separation liquid to enter a subsequent membrane separation stage. At this time, the COD of the separated liquid was about 200000 mg/L.
S2: a membrane separation stage, wherein the membrane separation is carried out on the wastewater discharged from the sedimentation tank 4 in the physicochemical treatment stage so as to meet the biochemical treatment load requirement of a biological treatment system;
the S2 concrete steps are:
s21: introducing the wastewater from the physicochemical treatment stage, namely the separation liquid of the sedimentation tank 4, into a water tank 6 with a heating device through a pump to heat the wastewater to 30-70 ℃, preferably 50 ℃;
preferably, the heat source of the heating device is the waste heat of a factory boiler;
s22: the heated wastewater is subjected to membrane separation through a membrane module 7 equipped with a hydrophilic selective permeable membrane, and a negative pressure environment is formed by vacuumizing on a permeable side, so that steam in the wastewater preferentially permeates through the membrane, and thus the steam is separated;
preferably, the hydrophilic permselective membrane is a PVA membrane;
s23: the separated steam is condensed in a condensation device and introduced into an intermediate water basin 10, the condensation temperature being between 0 ℃ and 5 ℃, preferably 5 ℃. The COD of the condensed water is about 20000mg/L, and the water yield is about 90%;
s2: a biological treatment stage for treating the wastewater from the membrane separation stage by biological treatment.
The materialization treatment stage specifically comprises the following steps:
the wastewater from the membrane separation system is subjected to biological treatment in the UASB reactor 11 and the MBR in sequence. Namely, the wastewater in the intermediate water tank 10 is lifted into a UASB reactor 11 by a pump, the sludge in the reactor is special particle or flocculent sludge, the COD of the effluent is about 3000mg/L, the effluent directly enters an MBR 12, aeration is arranged in the reactor, the sludge concentration in the reactor is maintained above 6000mg/L, the effluent is pumped out by a membrane component 7 in the MBR 12 after 24 hours of reaction, the COD of the effluent is about 400mg/L, and the discharge requirement of a nano tube is met.
The water-based paint wastewater treatment system for the embodiment 2 is used, and the using method further comprises the following sludge treatment steps:
sludge of the substrate in the sedimentation tank 4 in the physical and chemical treatment stage and solid phases generated in the UASB reactor 11 and the MBR reactor 12 in the biological treatment stage are sent to a plate-and-frame filter press 14 through a sludge pump 13 for solid-liquid separation, and separated liquid is sent to the water collecting tank 1 in the physical and chemical treatment stage through a pump for circular treatment. This allows spent liquor that has not been effectively treated during the process to be recycled to the sump 1 for re-treatment.
For example 3, the water-based paint wastewater treatment system was used in a method wherein S13 is: introducing the wastewater mixed with the alum floc into a plate-and-frame filter press 14 for solid-liquid separation, and introducing the separated liquid into a subsequent membrane separation stage.
The terms "first" and "second" as used herein do not denote any order, quantity, or importance, but rather are used to distinguish one element from another, unless otherwise specified. Similarly, modifiers similar to "about", "approximately" or "approximately" that occur before a numerical term herein typically include the same number, and their specific meaning should be read in conjunction with the context. Similarly, unless a specific number of a claim recitation is intended to cover both the singular and the plural, and also that claim may include both the singular and the plural.
In the description of the specific embodiments above, the use of the directional terms "upper", "lower", "left", "right", "top", "bottom", "vertical", "transverse", and "lateral", etc., are for convenience of description only and should not be considered limiting. Such as ….
Although particular embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these are examples only and that the scope of the present invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are all within the scope of the invention.
Claims (9)
1. A water-based paint wastewater treatment system is characterized by comprising a physicochemical treatment system, a membrane separation system and a biological treatment system;
the physicochemical treatment system is used for removing resin and pigment in the wastewater and preliminarily reducing the chemical oxygen demand of the wastewater;
the membrane separation system is used for further reducing the chemical oxygen demand of the wastewater from the physicochemical treatment system so as to meet the biochemical treatment load requirement of the biological treatment system;
the biological treatment system is used for further reducing the chemical oxygen demand of the wastewater from the membrane separation system;
the physicochemical treatment system, the membrane separation system and the biological treatment system are communicated in sequence through pipelines.
2. The water-based paint wastewater treatment system of claim 1, wherein the physicochemical treatment system comprises a water collecting tank, a pH adjusting tank, a coagulation reaction tank and a solid-liquid separator which are sequentially connected by pipelines.
3. The aqueous coating wastewater treatment system of claim 2, wherein the solid-liquid separator is a settling tank or a plate and frame filter press.
4. The water-based paint wastewater treatment system of claim 2, wherein the physicochemical treatment system further comprises a dosing system for adding a pH adjusting agent to the pH adjusting tank and adding a coagulant and a flocculant to the coagulation reaction tank.
5. The aqueous coating wastewater treatment system of claim 2, wherein the membrane separation system comprises a water tank with a heating device, a membrane module, a vacuum pump, a condensing device, an intermediate water tank,
a water tank wastewater inlet of the heating device is connected with a separation liquid outlet of the solid-liquid separator, and a water tank wastewater outlet of the heating device is connected with a membrane module wastewater inlet;
the membrane module is provided with a hydrophilic selective permeable membrane, and a vapor outlet of the membrane module is connected with a vapor inlet of the condensing device;
the vacuum pump is used for vacuumizing the membrane permeation side of the membrane component to form a negative pressure environment;
and a condensed water outlet of the condensing device is connected with a water inlet of the middle water tank.
6. The aqueous coating wastewater treatment system of claim 5, wherein the hydrophilic permselective membrane is a polyvinyl alcohol membrane.
7. The aqueous coating wastewater treatment system of claim 5, wherein the heat source of the heating device is plant boiler waste heat.
8. The aqueous coating wastewater treatment system of claim 1, wherein the biological treatment system comprises an upflow anaerobic sludge bed reactor, a membrane bioreactor connected in sequence by a pipeline.
9. The aqueous coating wastewater treatment system of any one of claims 1 to 8, further comprising a sludge pump and a plate and frame filter press, wherein the solid phase discharge ports of the physicochemical treatment system and the biological treatment system are connected with the plate and frame filter press through pipelines of the sludge pump, and the filtrate outlet of the plate and frame filter press is connected with the wastewater inlet of the physicochemical treatment system.
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| CN109824221A (en) * | 2019-04-04 | 2019-05-31 | 上海电气集团股份有限公司 | A kind of water paint waste water treatment system and application method |
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| CN109824221A (en) * | 2019-04-04 | 2019-05-31 | 上海电气集团股份有限公司 | A kind of water paint waste water treatment system and application method |
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