CN112707590A - Acrylic acid wastewater treatment device and acrylic acid wastewater treatment method - Google Patents
Acrylic acid wastewater treatment device and acrylic acid wastewater treatment method Download PDFInfo
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- CN112707590A CN112707590A CN202011524238.6A CN202011524238A CN112707590A CN 112707590 A CN112707590 A CN 112707590A CN 202011524238 A CN202011524238 A CN 202011524238A CN 112707590 A CN112707590 A CN 112707590A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
- C02F2103/36—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
Abstract
The invention provides an acrylic acid wastewater treatment device and a treatment method, wherein the acrylic acid wastewater treatment device comprises a water quality adjusting tank, a composite non-gradient reactor, a coupling device and a phosphorus removal tank, wherein the water quality adjusting tank is used for acrylic acid wastewater to sequentially pass through, the composite non-gradient reactor is provided with a first biochemical area and a sludge precipitation backflow area, the coupling device is provided with an ozone oxidation area and a second biochemical area, and the phosphorus removal tank is provided with a water outlet backflow pipe communicated with the composite non-gradient reactor; the floor area is small, the energy consumption is low, the operation is stable, and the stability is good.
Description
Technical Field
The invention relates to the field of wastewater treatment, in particular to an acrylic acid wastewater treatment device and an acrylic acid wastewater treatment method.
Background
Since the industrial production of acrylic acid in the 30's of the 20 th century, the technological development has gone through the cyanoethanol process, the oxo process, the ketene process, the acrylonitrile hydrolysis process and the propylene two-step oxidation process. At present, the two-step oxidation method of propylene is the main production method of acrylic acid, and in the process of producing acrylic acid by adopting the two-step oxidation method of propylene, water is needed to absorb oxidation products, and acrylic acid products are obtained through separation and refining procedures. Therefore, a large amount of waste water is generated in the production process of acrylic acid and esters. The wastewater in the industrial production of acrylic acid and ester is characterized by large wastewater quantity, high organic matter content, complex pollutant components and large water quality fluctuation.
Chinese patent No. CN201220405424.2 proposes an anaerobic treatment device for acrylic acid and ester mixed production wastewater. Introducing the wastewater into an adjusting tank to adjust the water quality, water quantity and pH, carrying out air floatation treatment and neutralization, simultaneously carrying out metal ion precipitation reaction, and adding PAC and PAM for flocculation when water is discharged. Mixing the supernatant with other production wastewater, pre-acidifying in a hydrolysis acidification tank, adjusting pH and temperature, and allowing the mixture to flow into a biological oxidation tank for aerobic treatment. But the method occupies a large area.
Chinese patent No. CN201610609657.7 proposes a waste water treatment technology for recycling acrylic acid and ester residual liquid. The combined process of ultrasonic pretreatment, anaerobic treatment, two-stage aerobic treatment and ultrasonic advanced treatment is adopted to treat the high-concentration acrylic acid and ester wastewater with the COD value of more than 4 ten thousand mg/L, wherein the ultrasonic pretreatment is carried out in two stages, namely, the high-frequency treatment is firstly adopted, and then the low-frequency treatment is adopted. The COD of the treated effluent is less than 60mg/L, which reaches the first-level discharge standard of the national Integrated wastewater discharge Standard (GB 8978 + 1996). However, the ultrasonic method requires energy supply, and in addition, the radiation range of the ultrasonic is not wide, the action volume is not very large, and the engineering utilization is somewhat difficult.
Chinese patent No. CN201610320102.0 discloses a combined treatment method of high concentration acrylic acid and ester wastewater, which utilizes an oxidant to oxidize and remove formaldehyde, acetaldehyde and acrolein in the acidic wastewater, and an alkali to neutralize acetic acid and acrylic acid in the oxidized liquid, wherein the neutralized liquid adopts a coupling technology of membrane separation to remove water, reduced pressure concentration, crystallization and drying to prepare acetate to treat the acidic wastewater. The formaldehyde removal rate of the oxidation liquid in the method reaches more than 99.5 percent, and the permeate liquid of the neutralization liquid after being separated by an RO membrane reaches the national environmental protection secondary emission standard. However, the film is a consumable and is costly.
CN 201210454811.X proposes a method for treating acidic wastewater of an acrylic acid plant. According to the relative content of two types of aldehydes containing alpha-H and not containing alpha-H in the acrylic acid wastewater, alkali metal or alkaline earth metal hydroxide, such as one or more of sodium hydroxide, calcium hydroxide and potassium hydroxide, is adopted to carry out dealdehyding reaction under high temperature. The biotoxicity of the treated acrylic acid wastewater is greatly reduced, and the acrylic acid wastewater is continuously treated by adopting an anaerobic-aerobic combined biological method, so that the effluent can reach the three-level discharge standard of the national Integrated wastewater discharge Standard (GB 8978-. But the dealdehyding reaction has high requirement and large energy consumption.
In view of the above, it is necessary to improve the conventional acrylic acid wastewater treatment apparatus and method for treating acrylic acid wastewater to solve the above problems.
Disclosure of Invention
The invention aims to provide an acrylic acid wastewater treatment device and an acrylic acid wastewater treatment method.
In order to achieve the aim, the invention provides an acrylic acid wastewater treatment device which comprises a water quality adjusting tank, a composite non-gradient reactor, a coupling device and a phosphorus removal tank, wherein the water quality adjusting tank is used for allowing acrylic acid wastewater to sequentially pass through the composite non-gradient reactor, the composite non-gradient reactor is provided with a first biochemical area and a sludge sedimentation backflow area, the coupling device is provided with an ozone oxidation area and a second biochemical area, and the phosphorus removal tank is provided with a water outlet backflow pipe communicated with the composite non-gradient reactor.
As a further improvement of the invention, the water quality adjusting tank comprises a tank body communicated with an acrylic acid wastewater source and an external water source, a first medicine adding assembly used for adding a nutrition adjusting agent and/or a pH adjusting agent into the tank body, and a pH detecting piece used for detecting the pH value of liquid in the tank body.
As a further improvement of the invention, the composite gradient-free reactor comprises a shell with an opening at the upper end, a lifting cylinder which is arranged in the shell and is communicated up and down, a first aeration head which is arranged in the lifting cylinder and is connected with an external air pump, a three-phase separator which is sleeved outside the upper end of the lifting cylinder, and an annular baffle which is arranged on the inner circumference of the shell, wherein a backflow seam is formed between the annular baffle and the three-phase separator, a water outlet is arranged at the position of the shell corresponding to the upper part of the backflow seam, a water inlet and a sludge discharge port are arranged at the position corresponding to the lower part of the backflow seam, the first biochemical area is formed in the lifting cylinder, and the three-phase separator and the annular baffle form the sludge sedimentation backflow area.
As a further improvement of the invention, the coupling device comprises a barrel body, a partition board which is arranged in the barrel body and is used for horizontally dividing the space in the barrel body into an ozone oxidation area and a second biochemical area, an ozone aeration head which is arranged in the ozone oxidation area and is connected with an external ozone source, a biological filler layer which is arranged in the second biochemical area, a water inlet pipe and a water outlet pipe which are arranged on the barrel body at the position corresponding to the second biochemical area and are respectively arranged at the bottom and the top of the biological filler layer, a lower backflow port and an upper backflow port which are used for communicating the ozone oxidation area and the second biochemical area are respectively arranged at the bottom and the top of the partition board, and the ozone aeration head and the biological filler layer are both arranged between the upper backflow port and the lower backflow port.
As a further improvement of the invention, the coupling device further comprises a second aeration head which is arranged in the ozone oxidation zone and is connected with an external air pump, and the second aeration head is positioned at the lower side of the ozone aeration head.
As a further improvement of the invention, the coupling device also comprises a backwashing component for backwashing the biological filler layer, and the backwashing component comprises a backwashing aeration pipe, a backwashing water inlet pipe and a backwashing water outlet pipe, wherein the backwashing aeration pipe is arranged at the lower side of the biological filler layer and is used for introducing air, and the backwashing water outlet pipe is arranged at the upper side of the biological filler layer.
In order to achieve the above object, the present invention further provides a method for treating acrylic acid wastewater, comprising the steps of:
feeding the acrylic acid wastewater into a water quality adjusting tank, and adding water, a nutrition regulator and a pH regulator into the water quality adjusting tank;
sending the produced water in the water quality regulating tank into a composite non-gradient reactor, and sequentially passing through a first biochemical area and a sludge sedimentation backflow area in the composite non-gradient reactor;
sending the produced water of the composite non-gradient reactor into a coupling device, and sequentially passing through an ozone oxidation area and a second biochemical area in the coupling device, wherein the adding amount of ozone in the ozone oxidation area is 300 mg/L;
sending the produced water of the coupling device into a dephosphorization tank with a dephosphorization agent and stirring;
at least part of the produced water in the dephosphorization tank flows back to the composite non-gradient reactor.
As a further improvement of the invention, the pH value of the produced water in the water quality adjusting tank is 3.5-4.5.
As a further improvement of the invention, after the produced water in the dephosphorization tank flows back to the composite non-gradient reactor, the volume ratio of the acrylic acid wastewater to the water is changed from 1:4, gradually decreasing to 1: 1.
as a further improvement of the invention, the first biochemical region and the second biochemical region are aerobic biochemical regions.
The invention has the beneficial effects that: in the acrylic acid wastewater treatment device, on one hand, the first biochemical region and the sludge sedimentation reflux region are integrated to form the composite gradient-free reactor, and the ozone oxidation region and the second biochemical region are integrated to form the integrated coupling device, so that the occupied area is small, and the energy consumption is low; on the other hand, the acrylic acid wastewater with large water quality fluctuation in a production workshop sequentially passes through the composite non-gradient reactor, the coupling device and the dephosphorization tank to produce water, so that the effluent discharge requirements of COD (chemical oxygen demand) less than 500mg/L and TP (total phosphorus) less than 8mg/L can be met, and the acrylic acid wastewater treatment system has a good sewage treatment effect, is stable in operation and has good stability.
Drawings
FIG. 1 is a schematic block diagram of an acrylic acid waste water treatment apparatus according to the present invention.
FIG. 2 is a flow chart of a method for treating acrylic acid waste water according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in detail below with reference to specific embodiments.
The invention provides an acrylic acid wastewater treatment device 100, which comprises a water quality regulating tank 1, a composite non-gradient reactor 2, a coupling device 3 and a phosphorus removal tank 4, wherein the water quality regulating tank 1 is used for acrylic acid wastewater to sequentially pass through, the composite non-gradient reactor 2 is provided with a first biochemical area and a sludge precipitation backflow area, the coupling device 3 is provided with an ozone oxidation area and a second biochemical area, and the phosphorus removal tank 4. experiments prove that the acrylic acid wastewater treatment device 100 is stable in operation and has good stability, and after the acrylic acid wastewater with larger water quality fluctuation in a production workshop passes through the acrylic acid wastewater treatment device 100, the produced water of the phosphorus removal tank 4 can meet the effluent discharge requirements of COD <500mg/L and TP <8mg/L, meanwhile, the first biochemical area and the sludge precipitation backflow area are integrated in the acrylic acid wastewater treatment device 100 to form a composite non-gradient reactor 2, the ozone oxidation area and the second biochemical area are integrated to form, the occupied area is small, and the energy consumption is low.
The dephosphorization tank 4 is provided with a water outlet return pipe 41 communicated with the composite non-gradient reactor 2, and the water produced by the dephosphorization tank 4 can be used for replacing or partially replacing the water originally used for diluting the acrylic acid wastewater in the water quality regulating tank 1, so that the water discharge and the total COD discharge amount of an enterprise can be greatly reduced, and the cost is reduced.
Further, the water quality adjusting tank 1 comprises a tank body 13 communicated with an acrylic acid wastewater source 11 and an external water source 12, a first medicine adding assembly 14 for adding a nutrition adjusting agent and/or a pH adjusting agent into the tank body 13, and a pH detecting member (not shown) for detecting the pH value of liquid in the tank body 13, so as to homogenize the quality of acrylic acid wastewater and improve the system operation stability of the whole acrylic acid wastewater treatment device 100.
Specifically, water is added into the tank body 13 through an external water source 12 to dilute the acrylic acid wastewater, reduce the concentration of pollutants in the acrylic acid wastewater, and control the COD concentration of the inlet water, so as to reduce the impact on microorganisms in the subsequent biochemical process and provide a stable environment for the growth of the microorganisms. Adding a corresponding nutrient regulator for microorganism growth into the tank body 13 through the first medicine adding assembly 14 so as to balance the nutrients in the acrylic acid wastewater, and is beneficial to the growth of rear-end microorganisms, adding a pH regulator into the tank body 13 through the first medicine adding assembly 14 so as to regulate the pH value to be between 3.5 and 4.5, monitoring the pH value of the wastewater through a pH monitoring device of the wastewater homogenization regulating tank 2, and adding an acid-base agent through a medicine adding device so as to regulate the pH value of the wastewater, controlling the COD concentration of inlet water, and fully mixing nutrient elements required by the rear-end microorganisms.
In one embodiment, the pH adjuster is ammonium sulfate and the pH adjuster is sodium hydroxide.
It is known that the acrylic acid waste water contains organic acid contaminants such as strong inorganic acids and acrylic acid, and the strong inorganic acids can be neutralized to remove the strong inorganic acids after adding sodium hydroxide to the acrylic acid waste water.
Further, the composite gradient-free reactor 2 includes a housing 21 with an open upper end, a lifting cylinder 22 disposed in the housing 21 and penetrating vertically, a first aeration head 23 disposed in the lifting cylinder 22 and connected to an external air pump 5, a three-phase separator 24 sleeved outside an upper end of the lifting cylinder 22, and an annular baffle 25 disposed on an inner circumference of the housing 21, wherein a backflow seam 26 is formed between the annular baffle 25 and the three-phase separator 24, a water outlet 211 is disposed at a position of the housing 21 corresponding to an upper side of the backflow seam 26, a water inlet 212 and a sludge discharge port 213 are disposed at a position corresponding to a lower side of the backflow seam 26, the first biochemical region is formed in the lifting cylinder 22, and the sludge sedimentation backflow region is formed by the three-phase separator 24 and the annular baffle 25. The biochemical reaction and the precipitation are arranged in the same reactor, so that the process flow is simplified, the occupied area is reduced, the cost can be saved, and the sludge yield is reduced.
Specifically, in this embodiment, the first aeration head 23 is disposed near the bottom of the lifting cylinder 22, and the first biochemical region is an aerobic biochemical region, but not limited thereto, and in other embodiments, an anaerobic biochemical region may be formed at the bottom of the lifting cylinder 22 by increasing the height of the first aeration head 23 and/or flexibly controlling the dissolved oxygen amount, so as to optimally control the growth conditions of different microorganisms, thereby achieving efficient removal of pollutants such as organic matters and total nitrogen.
After the acrylic acid wastewater treatment device 100 is started, the produced water in the water quality adjusting tank 1 is continuously introduced into the composite non-gradient reactor 2 from the water inlet 212, the air pump 5 is started to aerate and oxygenate the interior of the lifting cylinder 22 through the first aeration head 23, due to the difference of gas-liquid densities inside and outside the lifting cylinder 22, the density of the fluid inside the lifting cylinder 22 is smaller than that of the fluid outside the lifting cylinder 22, so that the acrylic acid wastewater, the gas and the activated sludge inside the lifting cylinder 22 move upwards simultaneously, when reaching the top of the lifting cylinder 22, a large amount of gas is separated from the acrylic acid wastewater, the separation of gas, liquid and solid phases is realized, the residual activated sludge and the acrylic acid wastewater flow back downwards in the form of a sludge-water mixture, a part of the sludge-water mixture enters a clarification area through the backflow seam 26, in the clarification area, the activated sludge and the wastewater are separated due to the density difference, and the separated supernatant is discharged from the water, the activated sludge flows back through the return slit 26 and reenters the first biochemical region, so that the microbial density in the first biochemical region is improved, and the sewage treatment load is improved. After a certain period of operation, the excess sludge in the housing 21 is discharged from the sludge discharge port 213.
The oxygen generated by the first aeration head 23 is used as the water flow driving force in the lifting cylinder 22, so that the energy consumption can be reduced, the full contact between the activated sludge and the acrylic acid wastewater is facilitated, the reaction between the acrylic acid wastewater and microorganisms is enhanced, and the treatment efficiency is improved.
Further, the return slit 26 is shaped like an inverted horn and is annular.
Specifically, the three-phase separator 24 includes the straight section of thick bamboo portion of upside, connect in the first horn section of thick bamboo of straight section of thick bamboo lower extreme, connect in the second horn section of thick bamboo of first horn section of thick bamboo lower extreme, first horn section of thick bamboo is the decurrent loudspeaker form of opening, the second horn section of thick bamboo is the ascending loudspeaker form of opening. The lower surface of the second trumpet is parallel to the upper surface of the annular baffle 25 and forms the return slit 26.
Further, the coupling device 3 includes a barrel 31, a partition plate 32 disposed in the barrel 31 to horizontally divide the space in the barrel 31 into an ozone oxidation area and a second biochemical area, an ozone aeration head 33 disposed in the ozone oxidation area and connected to an external ozone source 6, a bio-filler layer 34 disposed in the second biochemical area, a water inlet pipe 35 and a water outlet pipe 36 disposed at a position on the barrel 31 corresponding to the second biochemical area and respectively disposed at the bottom and the top of the bio-filler layer 34, a lower return port 321 and an upper return port 322 disposed at the bottom and the top of the partition plate 32 and communicating the ozone oxidation area and the second biochemical area, and the ozone aeration head 33 and the bio-filler layer 34 are both disposed between the upper return port 322 and the lower return port 321. The ozone oxidation area and the second biochemical area are combined, and the ozone oxidation and the microbial degradation can be carried out on the organic wastewater through the combined action of the ozone oxidation treatment and the microbial treatment, so that the treatment effect of organic pollutants in the acrylic acid wastewater is improved.
In one embodiment, the second biochemical region is an aerobic biochemical region, but not limited thereto.
Further, the coupling device 3 further comprises a second aeration head 37 disposed in the ozone oxidation zone and connected to the air pump 5, the second aeration head 37 is disposed at the lower side of the ozone aeration head 33, after the water produced by the composite gradient-free reactor 2 enters the coupling device 3 from the water inlet pipe 35 and enters the ozone oxidation zone from the lower return port 321, the air produced by the second aeration head 37 is fully mixed with the acrylic acid wastewater to form an air-acrylic acid wastewater mixed solution, and then the ozone is mixed with the air-acrylic acid wastewater mixed solution, so that the contact area between the ozone and the acrylic acid wastewater is increased, the acrylic acid wastewater is oxidized and degraded by the ozone, and the treatment efficiency is improved.
After the acrylic acid wastewater enters the ozone oxidation zone through the lower return port 321, under the action of the air charged by the second aeration head 37 and the ozone charged by the ozone aeration head 33, the density of the acrylic acid wastewater in the ozone oxidation zone is much lower than that of the acrylic acid wastewater outside the ozone oxidation zone, so that the acrylic acid wastewater entering the coupling device 3 can enter the ozone oxidation zone from the lower return port 321 first to oxidize or chemically modify part of organic matters into organic matters which can be decomposed by microorganisms, and then enter the second biochemical zone from the upper return port 322.
Further, the coupling device 3 is further provided with a support layer 38 located on the lower side of the bio-filler layer 34 to support the bio-filler layer 34.
Further, the coupling device 3 further comprises a backwashing component 39 for backwashing the bio-filler layer 34 to flush away excessive impurities in the bio-filler layer 34 and restore the activity of microorganisms in the bio-filler layer 34.
Specifically, the backwashing component 39 comprises a backwashing aeration pipe 391 and a backwashing water inlet pipe 392 which are arranged on the lower side of the biological filler layer 34 and used for introducing air, and a backwashing water outlet pipe 393 arranged on the upper side of the biological filler layer 34, wherein the backwashing aeration pipe 391 is connected with the air pump 5, the backwashing aeration pipe 391 is higher than the backwashing water inlet pipe 392, when the biological filler layer 34 needs to be backwashed, the backwashing water inlet pipe 392 is opened, the backwashing aeration pipe 391 fills air into water, air-water mixed liquid is formed to fully wash the biological filler layer 34, and the liquid after washing flows out from the backwashing water outlet pipe 393.
Specifically, the backwash water outlet pipe 393 is positioned at the lower side of the water outlet pipe 36 to prevent the flushed liquid from flowing out of the water outlet pipe 36 and polluting the water outlet pipe 36 and the liquid in the phosphorus removal tank 4.
Specifically, the backwash aeration tube 391 and backwash inlet tube 392 are both disposed within the support layer 38.
Further, the phosphorus removal tank 4 comprises a tank 42, a second dosing assembly 43 for adding a phosphorus removal agent into the tank 42, and a stirring assembly for stirring the liquid in the tank 42, wherein the phosphorus removal tank 4 is used for removing phosphorus and copper ions in the water produced by the coupling device 3, so that the water discharged from the phosphorus removal tank 4 meets the water discharge requirement.
Further, the present invention also provides a method for treating acrylic acid wastewater, which is based on the above acrylic acid wastewater treatment apparatus 100, specifically, the method for treating acrylic acid wastewater comprises the following steps:
s1: sending the acrylic acid wastewater into a water quality adjusting tank 1, and adding water, a nutrition regulator and a pH regulator into the water quality adjusting tank 1;
s2: sending the produced water in the water quality adjusting tank 1 into a composite non-gradient reactor 2, and sequentially passing through a first biochemical area and a sludge sedimentation backflow area in the composite non-gradient reactor 2;
s3: the water produced by the composite non-gradient reactor 2 is sent into a coupling device 3 and sequentially passes through an ozone oxidation area and a second biochemical area in the coupling device 3, wherein the adding amount of ozone in the ozone oxidation area is 300 mg/L;
s4: and (3) delivering the produced water of the coupling device 3 into a dephosphorization tank 4 with a dephosphorization agent, stirring, and refluxing at least a part of the produced water in the dephosphorization tank 4 into the composite non-gradient reactor 2.
Further, in step S1, the pH of the produced water in the water quality adjusting tank 1 is 3.5 to 4.5. Namely, the pH value of the produced water in the water quality adjusting tank 1 is adjusted to 3.5 to 4.5 by adding the pH adjusting agent.
Specifically, in step S2, the produced water in the water quality adjusting tank 1 is fed into the composite non-gradient reactor 2 and then stays for about 120 hours; in step S3, the water produced by the composite non-gradient reactor 2 is fed into the coupling device 3 and then stays for about 10 hours, so that the acrylic acid wastewater and the microorganism/ozone are fully reacted.
Further, after the produced water in the phosphorus removal tank 4 flows back to the composite non-gradient reactor 2, the volume ratio of the acrylic acid wastewater to the water is changed from 1:4, gradually decreasing to 1:1, the produced water in the dephosphorization tank 4 replaces part of the dilution water, so that the water discharge and the total COD discharge amount of the enterprise can be greatly reduced, and the cost is reduced.
The treatment results of treating acrylic acid waste water by using the apparatus and method for treating acrylic acid waste water of the present invention will be described below with specific examples; of course, it is to be understood that the embodiments of the present invention are not limited to these embodiments.
In a specific embodiment, the acrylic acid wastewater treatment device and the treatment method are adopted to treat acrylic acid production wastewater from Jiangsu Lingtian science and technology, wherein COD in the acrylic acid production wastewater from Jiangsu Lingtian science and technology is large in floating amount, the content of copper ions is 80-90mg/L, and the pH is 3-4.
In the first embodiment of the invention, the COD content of the acrylic acid production wastewater from Jiangsu Ritian technology is 66000-68000mg/L, the copper ion content is 80-90mg/L, the total phosphorus content is 100-120mg/L, and the pH value is 3.5-4.
When the acrylic acid wastewater treatment device is in a domestication stage, acrylic acid wastewater and dilution water are diluted in a water quality regulating tank according to the ratio of 1:4 and then enter a composite non-gradient reactor, and after the acrylic acid wastewater treatment device is in a stable operation stage, acrylic acid wastewater and dilution water are diluted in a water quality regulating tank according to the ratio of 1:1 and then enter the composite non-gradient reactor, so that the actual water inlet COD of the composite non-gradient reactor is 33000 and 34000mg/L, the total phosphorus content is 50-60mg/L, the copper ion content is 40-50mg/L, the water production COD is 2200 and 2300mg/L, and the removal rate of COD is 93%.
After the produced water of the composite non-gradient reactor enters the coupling device, the ozone dosage is adjusted to 300mg/L, the COD of the produced water of the coupling device is 360-470mg/L, the COD removal rate is 79.6-83.6%, the comprehensive COD removal rate is calculated to be 97.7-98%, and the total phosphorus degradation rate is 45-49%. It can be understood that when the acrylic acid wastewater is treated by the composite non-gradient reactor and the coupling device, the pH value of the acrylic acid wastewater is increased, and part of copper ions are precipitated and removed.
After the water produced by the coupling device enters the dephosphorization tank, adding a dephosphorization agent and stirring, wherein the total phosphorus content of the water produced by the dephosphorization tank is below 5mg/l, the removal rate reaches more than 90%, and meanwhile, the copper ion content is lower than the detection limit, thereby meeting the drainage requirement.
In the second embodiment of the invention, the COD content of the acrylic acid production wastewater from Jiangsu Ritian technology is 53000-54000mg/L, the copper ion content is 70-80mg/L, the total phosphorus content is 80-90mg/L, and the pH value is 3.5-4.
When the acrylic acid wastewater treatment device is in the domestication stage, acrylic acid wastewater and dilution water are diluted in the water quality regulating pool according to the ratio of 1:4 and then enter the composite non-gradient reactor, and after the acrylic acid wastewater treatment device is in the stable operation stage, acrylic acid wastewater and dilution water are diluted in the water quality regulating pool according to the ratio of 1:1 and then enter the composite non-gradient reactor, so that the actual water inlet COD of the composite non-gradient reactor is 26000 plus materials 27000mg/L, the total phosphorus content is 40-45mg/L, the copper ion content is 30-40mg/L, the water production COD is 1600 plus materials 1800mg/L, and the actual COD removal rate is 94%.
After the produced water of the composite non-gradient reactor enters the coupling device, the ozone dosage is adjusted to 300mg/L, the COD of the produced water of the coupling device is 360-440mg/L, the COD removal rate is 75.5-77.5%, the comprehensive COD removal rate is calculated to be about 98.6%, and the total phosphorus degradation rate is 45-49%. It can be understood that when the acrylic acid wastewater is treated by the composite non-gradient reactor and the coupling device, the pH value of the acrylic acid wastewater is increased, and part of copper ions are precipitated and removed.
After the water produced by the coupling device enters the dephosphorization tank, adding a dephosphorization agent and stirring, wherein the total phosphorus content of the water produced by the dephosphorization tank is below 5mg/l, the removal rate reaches more than 90%, and meanwhile, the copper ion content is lower than the detection limit, thereby meeting the drainage requirement.
In conclusion, the acrylic acid wastewater treatment device 100 provided by the invention is stable in operation and good in stability, and after acrylic acid wastewater with large water quality fluctuation in a production workshop passes through the acrylic acid wastewater treatment device 100, the effluent discharge requirements of COD <500mg/L and TP <8mg/L can be met by the produced water of the dephosphorization tank 4, meanwhile, the first biochemical region and the sludge precipitation reflux region are integrated in the acrylic acid wastewater treatment device 100 to form the composite non-gradient reactor 2, and the ozone oxidation region and the second biochemical region are integrated to form the integrated coupling device 3, so that the occupied area is small, the energy consumption is low, and the resource waste is avoided.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the present invention.
Claims (10)
1. The utility model provides an acrylic acid effluent treatment plant which characterized in that: acrylic acid effluent treatment plant is including supplying the acrylic acid waste water quality control tank that the acrylic acid waste water passes through in proper order, the compound no gradient reactor that has first biochemical district and sludge sedimentation backward flow district, coupling device, the dephosphorization jar that has ozone oxidation district and second biochemical district, the dephosphorization jar be provided with compound no water reflux pipe that no gradient reactor is linked together.
2. The acrylic acid wastewater treatment apparatus according to claim 1, characterized in that: the water quality adjusting tank comprises a tank body communicated with an acrylic acid wastewater source and an external water source, a first medicine adding assembly used for adding a nutrition adjusting agent and/or a pH adjusting agent into the tank body, and a pH detecting piece used for detecting the pH value of liquid in the tank body.
3. The acrylic acid wastewater treatment apparatus according to claim 1, characterized in that: the composite gradient-free reactor comprises a shell with an opening at the upper end, a lifting cylinder, a first aeration head, a three-phase separator and an annular baffle, wherein the lifting cylinder is arranged in the shell and is vertically communicated, the first aeration head is arranged in the lifting cylinder and is connected with an external air pump, the three-phase separator is sleeved on the outer side of the upper end of the lifting cylinder, the annular baffle is arranged on the inner periphery of the shell, a backflow seam is formed between the annular baffle and the three-phase separator, a water outlet is formed in the position, corresponding to the upper part of the backflow seam, of the shell, a water inlet and a sludge discharge port are formed in the position, corresponding to the lower part of the backflow seam, of the shell, the first biochemical region is formed in the lifting cylinder, and the three.
4. The acrylic acid wastewater treatment apparatus according to claim 1, characterized in that: the coupling device comprises a barrel body, a partition board which is arranged in the barrel body and is used for dividing the space in the barrel body into an ozone oxidation area and a second biochemical area along the horizontal direction, an ozone aeration head which is arranged in the ozone oxidation area and is connected with an external ozone source, a biological packing layer which is arranged in the second biochemical area, a water inlet pipe and a water outlet pipe which are arranged at the position corresponding to the second biochemical area on the barrel body and are respectively arranged at the bottom and the top of the biological packing layer, the bottom and the top of the partition board are respectively provided with a lower backflow port and an upper backflow port which are communicated with the ozone oxidation area and the second biochemical area, and the ozone aeration head and the biological packing layer are both arranged between the upper backflow port and the lower backflow port.
5. The acrylic acid wastewater treatment apparatus according to claim 4, characterized in that: the coupling device also comprises a second aeration head which is arranged in the ozone oxidation area and connected with an external air pump, and the second aeration head is positioned at the lower side of the ozone aeration head.
6. The acrylic acid wastewater treatment apparatus according to claim 4, characterized in that: the coupling device further comprises a backwashing component for backwashing the biological filler layer, and the backwashing component comprises a backwashing aeration pipe, a backwashing water inlet pipe and a backwashing water outlet pipe, wherein the backwashing aeration pipe and the backwashing water inlet pipe are arranged on the lower side of the biological filler layer and are used for introducing air, and the backwashing water outlet pipe is arranged on the upper side of the biological filler layer.
7. A method for treating acrylic acid wastewater is characterized by comprising the following steps: the method comprises the following steps:
feeding the acrylic acid wastewater into a water quality adjusting tank, and adding water, a nutrition regulator and a pH regulator into the water quality adjusting tank;
sending the produced water in the water quality regulating tank into a composite non-gradient reactor, and sequentially passing through a first biochemical area and a sludge sedimentation backflow area in the composite non-gradient reactor;
sending the produced water of the composite non-gradient reactor into a coupling device, and sequentially passing through an ozone oxidation area and a second biochemical area in the coupling device, wherein the adding amount of ozone in the ozone oxidation area is 300 mg/L;
sending the produced water of the coupling device into a dephosphorization tank with a dephosphorization agent and stirring;
at least part of the produced water in the dephosphorization tank flows back to the composite non-gradient reactor.
8. The method for treating acrylic acid waste water according to claim 7, characterized in that: the pH value of the produced water in the water quality adjusting tank is 3.5-4.5.
9. The method for treating acrylic acid waste water according to claim 7, characterized in that: after the produced water in the dephosphorization tank flows back to the composite non-gradient reactor, the volume ratio of the acrylic acid wastewater to the water is from 1:4, gradually decreasing to 1: 1.
10. the method for treating acrylic acid waste water according to claim 7, characterized in that: the first biochemical area and the second biochemical area are aerobic biochemical areas.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113354197A (en) * | 2021-06-08 | 2021-09-07 | 江苏利田科技股份有限公司 | Biochemical treatment method and system for acrylic ester production wastewater |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113354197A (en) * | 2021-06-08 | 2021-09-07 | 江苏利田科技股份有限公司 | Biochemical treatment method and system for acrylic ester production wastewater |
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