CN216236564U - Nitrate wastewater treatment system - Google Patents
Nitrate wastewater treatment system Download PDFInfo
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- CN216236564U CN216236564U CN202122854456.2U CN202122854456U CN216236564U CN 216236564 U CN216236564 U CN 216236564U CN 202122854456 U CN202122854456 U CN 202122854456U CN 216236564 U CN216236564 U CN 216236564U
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Abstract
The utility model discloses a nitrate wastewater treatment system, which mainly comprises a catalytic reduction device, an adsorption device, a facultative biological treatment device, a solid-liquid separation device, a sludge concentration device and a dehydration device. The catalytic reduction device is provided with a metal catalyst input end and a reducing agent input end, the adsorption device is communicated with the catalytic reduction device, the facultative biological treatment device is communicated with the adsorption device, the solid-liquid separation device is communicated with the facultative biological treatment device, the sludge concentration device is communicated with the solid-liquid separation device, and the dehydration device is communicated with the sludge concentration device. Therefore, the treatment efficiency of the nitrate wastewater can be improved, and the goal of water quality purification can be quickly achieved.
Description
Technical Field
The utility model relates to a wastewater treatment system, in particular to a nitrate wastewater treatment system capable of effectively improving the microbial treatment effect.
Background
Nitrate is a common pollutant in water, and the harm to the environment is paid global attention, so nitrate in effluent water of various industries is strictly controlled, and the industries which are regulated at present comprise photoelectric industry, wafer manufacturing and semiconductor industry, petrochemical industry and chemical industry.
The nitrate wastewater treatment method mainly comprises a biological method and a physical and chemical method. The biological method is to decompose nitrate in the wastewater and additionally add organic matters by microorganisms to remove the nitrate, and the microorganisms can obtain energy required by growth and continuously reproduce in the process. However, the biological method has a high demand for wastewater quality, and if the nitrate concentration is too high, it may cause negative toxicity to microorganisms. In addition, the biological method has the problems that the operation is not easy to control, the required treatment time is long, and other substances with the inhibiting effect on microorganisms still exist in the wastewater.
The physicochemical principle is that the waste water is firstly absorbed to concentrate nitrate, and then the nitrate is reduced into gaseous nitrogen through electrolytic reaction to be removed from the waste water. However, if the high concentration nitrate is completely removed from the wastewater only by the electrolysis reaction, a large amount of energy and a long time are consumed, and the required equipment cost is high, which is not favorable for practical application.
SUMMERY OF THE UTILITY MODEL
The utility model mainly aims to solve the problems existing in the nitrate wastewater purification only by using a microorganism treatment mode, and adopts the following technical means: the waste water is firstly treated by normal temperature catalytic reduction, metal catalyst and reducing agent are added in the process, the pH value of a reaction system is controlled to be 1.5-2.2, so that most of nitrate in the waste water is quickly reduced into nitrogen, and the treated water is adsorbed to remove metal ions and then is treated by facultative biological treatment, so that the residual nitrate pollutants are removed.
In order to solve the above technical problems, one of the technical solutions of the present invention is to provide a nitrate wastewater treatment system, which includes a catalytic reduction device, an adsorption device, a facultative biological treatment device, a solid-liquid separation device, a sludge concentration device, and a dewatering device. The catalytic reduction device is provided with a metal catalyst input end and a reducing agent input end, the adsorption device is communicated with the catalytic reduction device, the facultative biological treatment device is communicated with the adsorption device, the solid-liquid separation device is communicated with the facultative biological treatment device, the sludge concentration device is communicated with the solid-liquid separation device, and the dehydration device is communicated with the sludge concentration device.
In an embodiment of the present invention, a receiving end of the adsorption device is communicated with a first wastewater output end of the catalytic reduction device, a first receiving end of the facultative biological treatment device is communicated with a first discharge end of the adsorption device, a first receiving end of the solid-liquid separation device is communicated with a discharge end of the facultative biological treatment device, a receiving end of the sludge concentration device is communicated with a sludge discharge end of the solid-liquid separation device, and a receiving end of the dewatering device is communicated with a sludge discharge end of the sludge concentration device.
In an embodiment of the present invention, the nitrate wastewater treatment system further includes an electrolysis device, a receiving end of the electrolysis device is communicated with a second discharge end of the adsorption device, and a discharge end of the electrolysis device is communicated with a regeneration liquid supply source.
In an embodiment of the present invention, the adsorption device is a metal ion adsorption device and has a regeneration liquid input end.
In an embodiment of the present invention, the nitrate wastewater treatment system further comprises a temporary storage tank, a receiving end of the temporary storage tank is communicated with the first discharge end of the adsorption device, and a discharge end of the temporary storage tank is communicated with the first receiving end of the facultative biological treatment device.
In an embodiment of the present invention, a liquid discharge end of the dehydration device is communicated with a second receiving end of the facultative biological treatment device.
In an embodiment of the present invention, the liquid discharge end of the dehydration device is communicated with the second receiving end of the facultative biological treatment device through a return line.
In an embodiment of the present invention, the nitrate wastewater treatment system further includes a metal catalyst dosing device and a reducing agent dosing device, the metal catalyst dosing device is communicated with the metal catalyst input end of the catalytic reduction device, and the reducing agent dosing device is communicated with the reducing agent input end of the catalytic reduction device.
In an embodiment of the present invention, the catalytic reduction device further has an acid-base agent input end, and a pH monitor is disposed in the catalytic reduction device.
In an embodiment of the present invention, the solid-liquid separation device comprises a settling tank, a flotation tank or a membrane filter.
One of the benefits of the nitrate wastewater treatment system is that the nitrate wastewater treatment system can improve the treatment efficiency of nitrate wastewater, especially can improve the removal efficiency of the nitrate pollutants by the microorganism or the mixed microorganism system, and simultaneously meets the requirements of reducing cost, energy consumption and environmental protection through the technical characteristics that the catalytic reduction device is provided with a metal catalyst input end and a reducing agent input end, the adsorption device is communicated with the catalytic reduction device, and the facultative biological treatment device is communicated with the adsorption device.
Furthermore, the nitrate wastewater treatment system of the present invention may further comprise an electrolysis device for recovering the catalytic metal from the regeneration liquid used in the adsorption device for reuse.
Drawings
For a better understanding of the features and technical content of the present invention, reference should be made to the following detailed description of the utility model and accompanying drawings, which are provided for purposes of illustration and description only and are not intended to limit the utility model.
FIG. 1 is a schematic view of a nitrate-containing wastewater treatment system according to a first embodiment of the present invention.
FIG. 2 is a schematic view of a nitrate-containing wastewater treatment system according to a second embodiment of the present invention.
FIG. 3 is another schematic view of a nitrate-containing wastewater treatment system according to a second embodiment of the present invention.
FIG. 4 is a schematic view of a nitrate-containing wastewater treatment system according to a third embodiment of the present invention.
Detailed Description
The following is a description of the embodiments of the nitrate wastewater treatment system disclosed in the present invention by specific examples, and those skilled in the art can understand the advantages and effects of the present invention from the disclosure of the present specification. The utility model is capable of other and different embodiments and its several details are capable of modification and various other changes, which can be made in various details within the specification and without departing from the spirit and scope of the utility model. The drawings of the present invention are for illustrative purposes only and are not intended to be drawn to scale. The following embodiments will further explain the related art of the present invention in detail, but the disclosure is not intended to limit the scope of the present invention. In addition, the term "or" as used herein should be taken to include any one or combination of more of the associated listed items as the case may be.
Although the terms "first," "second," "third," etc. are used herein to describe the transfer lines of wastewater or sludge, these terms are primarily used to distinguish one transfer line from another, and are not intended to limit these transfer lines.
First embodiment
Referring to FIG. 1, a nitrate wastewater treatment system Z1 according to a first embodiment of the present invention is mainly configured. As shown in FIG. 1, the nitrate wastewater treatment system Z1 mainly comprises a catalytic reduction device 1, an adsorption device 2, a facultative biological treatment device 3, a solid-liquid separation device 4, a sludge concentration device 5 and a dehydration device 6. The adsorption device 2 is communicated with the catalytic reduction device 1, the facultative biological treatment device 3 is communicated with the adsorption device 2, the solid-liquid separation device 4 is communicated with the facultative biological treatment device 3, the sludge concentration device 5 is communicated with the solid-liquid separation device 4, and the dehydration device 6 is communicated with the sludge concentration device 5.
In the present embodiment, the catalytic reduction apparatus 1 may have a wastewater input 11, a metal catalyst input 12, a reducing agent input 13, and a first wastewater output 14. The wastewater input end 11 is configured to introduce nitrate wastewater to be treated into the apparatus for catalytic reduction reaction, and a metal catalyst and a reducing agent are added during the reaction process, and the pH of the wastewater is controlled to be 1.5-2.2, so that most of nitrate in the wastewater is rapidly reduced into nitrogen. The metal catalyst input 12 is configured to dose a fixed amount of metal catalyst into the wastewater to improve the reduction effect; the metal catalyst may be iron powder, aluminum powder or zinc powder, but is not limited thereto. The reductant input 13 is configured to dose a metered amount of reductant into the wastewater; the reducing agent can be sodium borohydride (NaBH)4) Sulfamic acid (H)3NSO3) Or sodium sulfide (Na)2S), but is not limited thereto. The first wastewater output 14 is configured to discharge the reacted wastewater out of the apparatus.
In practical application, the nitrate wastewater treatment system Z1 may further include a metal catalyst dosing device and a reducing agent dosing device, the metal catalyst dosing device is communicated with the metal catalyst input end 12 of the catalytic reduction device 1, and the reducing agent dosing device is communicated with the reducing agent input end 13 of the catalytic reduction device 1.
Preferably, the catalytic reduction device 1 may further have an acid-base agent input terminal 15 for adding an acid-base agent for pH adjustment to the wastewater; the acid-base agent can be sulfuric acid (H)2SO4) Or sodium hydroxide (NaOH), but is not limited thereto. In addition, a pH monitor may be installed in the catalytic reduction apparatus 1 to detect the pH of the wastewater at any time during the reaction.
The adsorption device 2 is a metal ion adsorption device (e.g., an adsorption tower) which can separate the metal ions in the wastewater after the reaction by using an adsorption material (e.g., metal adsorption resin) to achieve the purpose of thoroughly removing the metal ions in the wastewater. The adsorption device 2 may have a receiving end 21 and a first discharging end 22, the receiving end 21 is configured to introduce the reacted wastewater into the device for metal ion adsorption, and the first discharging end 22 is configured to discharge the wastewater from which the metal ions have been separated out.
Preferably, the adsorption device 2 may further have a regeneration liquid input end 23 and a second discharge end 24, the regeneration liquid input end 23 is configured to introduce the regeneration liquid into the device to perform desorption regeneration on the adsorption-saturated adsorption material, so as to substantially recover the adsorption capacity of the adsorption material on the metal ions in the wastewater, and the second discharge end 24 is configured to discharge the used regeneration liquid out of the device.
The facultative biological treatment apparatus 3 may have a first receiving end 31 and a discharging end 32, the first receiving end 31 is configured to introduce the wastewater from which the metal ions have been separated into the apparatus for biological treatment, i.e. decomposing and removing the nitrate pollutants remained in the wastewater by using the microorganism or mixed microorganism system with the additional addition of organic matters, and the discharging end 32 is configured to discharge the biologically treated wastewater out of the apparatus. It is worth mentioning that the nitrate wastewater passes through the catalytic reduction device 1 to convert most of the nitrate into nitrogen before entering the facultative biological treatment device 3, so that the decomposition effect of the microorganisms or mixed microorganism system on the nitrate pollutants can be improved.
The solid-liquid separation device 4 has a first receiving end 41, a sludge discharging end 42 and a liquid discharging end 43, the first receiving end 41 is configured to introduce the biologically treated wastewater into the device for solid-liquid separation, the sludge discharging end 42 is configured to discharge the separated sludge out of the device, and the liquid discharging end 43 is configured to discharge the separated liquid phase out of the device. Furthermore, the solid-liquid separation device 4 may comprise a settling tank, wherein the biologically treated wastewater may be retained for a period of time at a set surface overflow rate, and removed from the wastewater after the particles and sludge are moved downward to the bottom of the device by gravity; alternatively, the solid-liquid separation device 4 may comprise a flotation tank wherein the biologically treated wastewater may be retained for a period of time at a set surface overflow rate and removed from the wastewater after the particles and sludge have moved upwardly to the top of the device by buoyancy. The above description is only a possible embodiment and is not intended to limit the present invention.
The sludge thickening apparatus 5 may have a receiving end 51 and a sludge discharging end 52, wherein the receiving end 51 is configured to introduce the sludge separated from the solid-liquid separation apparatus 4 into the apparatus for thickening, such as gravity thickening, air flotation thickening or centrifugal thickening, to increase the sludge concentration fed into the rear-end dewatering apparatus 6 and reduce the sludge volume, and the sludge discharging end 52 is configured to discharge the thickened sludge out of the apparatus. The dewatering device 6 may have a receiving end 61 and a liquid discharging end 62, the receiving end 61 is configured to introduce the concentrated sludge into the device for dewatering, the solid waste obtained after dewatering can be moved to a designated place for final treatment, such as incineration or landfill, and the liquid discharging end 62 is configured to discharge the removed liquid phase out of the device.
In practice, the wastewater input 11 of the catalytic reduction unit 1 may be in communication with the first transfer line a1 for introducing nitrate wastewater through the first transfer line a 1; the nitrate containing wastewater may be subjected to one or more pretreatment processes to reduce the amount of materials in the wastewater that may kill or inhibit the growth of microorganisms, and then introduced into the first transfer line a 1. The receiving end 21 of the adsorption apparatus 2 may be communicated with the first wastewater output end 14 of the catalytic reduction apparatus 1 through a second transfer line a2, the first receiving end 31 of the facultative biological treatment apparatus 3 may be communicated with the first discharge end 22 of the adsorption apparatus 2 through a third transfer line A3, the first receiving end 41 of the solid-liquid separation apparatus 4 may be communicated with the discharge end 32 of the facultative biological treatment apparatus 3 through a fourth transfer line a4, the receiving end 51 of the sludge concentration apparatus 5 may be communicated with the sludge discharge end 42 of the solid-liquid separation apparatus 4 through a fifth transfer line a5, and the receiving end 61 of the dewatering apparatus 6 may be communicated with the sludge discharge end 52 of the sludge concentration apparatus 5 through a sixth transfer line a 6.
Referring back to FIG. 1, according to practical needs, such as to improve the circulation and practicability of the nitrate wastewater treatment system Z1, the facultative biological treatment apparatus 3 may further have a second receiving end 33, and the second receiving end 33 may be communicated with the liquid discharge end 62 of the dehydration apparatus 6 through a return line B1; accordingly, the liquid phase removed by the dehydration apparatus 6 can be returned to the facultative biological treatment apparatus 3 for further treatment.
In addition, each pipeline may be connected to a pump, a valve and a flow detector (not shown), and all the pumps and valves are controlled by one or more control units to realize the automatic control of the transportation, circulation and discharge of the water or slurry.
Second embodiment
Referring to FIG. 2, there is shown a main configuration of a nitrate wastewater treatment system Z2 according to a second embodiment of the present invention. As shown in fig. 2, in addition to the catalytic reduction apparatus 1, the adsorption apparatus 2, the facultative biological treatment apparatus 3, the solid-liquid separation apparatus 4, the sludge concentration apparatus 5 and the dehydration apparatus 6 described in the first embodiment, the nitrate wastewater treatment system Z2 further includes an electrolysis apparatus 7 which is disposed and connected to the adsorption apparatus 2 and then can recover catalytic metals from the regenerated liquid used by the adsorption apparatus 2 for reuse, thereby improving economic efficiency.
In the present embodiment, the electrolysis device 7 may have a receiving end 71 and a discharging end 72, the receiving end 71 is communicated with the second discharging end 24 of the adsorption device 2, and the discharging end 72 is communicated with the regeneration liquid supply source (not numbered). Wherein the receiving end 71 is configured to introduce the used regeneration liquid discharged from the adsorption device 2 into the device for electrolysis, so that the metal components in the regeneration liquid are directly reduced to solid metal; the discharge end 72 is configured to discharge the electrolyzed regeneration liquid out of the apparatus for recycling.
In practice, the catalytic reduction device 1 may be in communication with the first transfer line a1 for introducing nitrate containing wastewater through the first transfer line a 1. Also, the receiving end 21 of the adsorption apparatus 2 may communicate with the first wastewater output end 14 of the catalytic reduction apparatus 1 through the second transfer line a2, the first receiving end 31 of the facultative biological treatment apparatus 3 may communicate with the first discharge end 22 of the adsorption apparatus 2 through the third transfer line A3, the receiving end 71 of the electrolysis apparatus 7 may communicate with the second discharge end 24 of the adsorption apparatus 2 through the fourth transfer line a4, and the discharge end 72 of the electrolysis apparatus 7 may communicate with the regeneration liquid supply source through the fifth transfer line a 5. The first receiving terminal 41 of the solid-liquid separation device 4 can communicate with the discharge terminal 32 of the facultative biological treatment device 3 through a sixth transfer line A6, the receiving terminal 51 of the sludge concentration device 5 can communicate with the sludge discharge terminal 42 of the solid-liquid separation device 4 through a seventh transfer line A7, and the receiving terminal 61 of the dewatering device 6 can communicate with the sludge discharge terminal 52 of the sludge concentration device 5 through an eighth transfer line A8.
Referring back to FIG. 2, according to practical needs, such as to improve the circulation and practicability of the nitrate wastewater treatment system Z1, the facultative biological treatment apparatus 3 may further have a second receiving end 33, and the second receiving end 33 may be communicated with the liquid discharge end 62 of the dehydration apparatus 6 through a return line B1; accordingly, the liquid phase removed by the dehydration apparatus 6 can be returned to the facultative biological treatment apparatus 3 for further treatment.
Referring to FIG. 3, there is shown a possible configuration of a nitrate wastewater treatment system Z1 according to a second embodiment of the present invention. As shown in FIG. 3, the nitrate wastewater treatment system Z1 may further include a temporary storage tank 8, and the temporary storage tank 8 is disposed and connected between the adsorption device 2 and the facultative biological treatment device 3 for temporarily storing the water to be treated. Further, the temporary storage tank 8 may have a receiving end 81 and a discharging end 82, the receiving end 81 may communicate with the first discharging end 22 of the adsorption device 2, and the discharging end 82 may communicate with the first receiving end 31 of the facultative biological treatment device 3; accordingly, the wastewater from which the metal ions have been separated can be stored in the temporary storage tank 8, and then introduced into the facultative biological treatment apparatus 3 again for biological treatment when the amount of the wastewater is accumulated to a certain level.
In practice, the receiving end 81 of the temporary holding tank 8 may communicate with the first discharge end 22 of the adsorption apparatus 2 through the upstream portion A31 of the third transfer line A3, and the discharge end 82 may communicate with the first receiving end 31 of the facultative biological treatment apparatus 3 through the downstream portion A32 of the third transfer line A3.
The related technical details mentioned in the first embodiment are still valid in this embodiment, and are not described herein again in order to reduce repetition. Also, the related-art details mentioned in the present embodiment can be applied to the first embodiment.
Third embodiment
Referring to FIG. 4, there is shown a main configuration of a nitrate wastewater treatment system Z3 according to a third embodiment of the present invention. As shown in fig. 4, the main difference between the present embodiment and the second embodiment is that the number of the adsorption device 2 can be two, and the adsorption device is configured in parallel and communicated between the catalytic reduction device 1 and the electrolysis device 7; accordingly, the two adsorption devices 2 can be operated alternately to perform desorption regeneration on the adsorption material of one of the adsorption devices 2, thereby substantially restoring the adsorption capacity of the adsorption material on the metal ions in the wastewater.
Advantageous effects of the embodiments
One of the benefits of the nitrate wastewater treatment system is that the nitrate wastewater treatment system can improve the treatment efficiency of nitrate wastewater, especially can improve the removal efficiency of the nitrate pollutants by the microorganism or the mixed microorganism system, and simultaneously meets the requirements of reducing cost, energy consumption and environmental protection through the technical characteristics that the catalytic reduction device is provided with a metal catalyst input end and a reducing agent input end, the adsorption device is communicated with the catalytic reduction device, and the facultative biological treatment device is communicated with the adsorption device.
Furthermore, the nitrate wastewater treatment system of the present invention may further comprise an electrolysis device for recovering the catalytic metal from the regeneration liquid used in the adsorption device for reuse.
The disclosure is only a preferred embodiment of the utility model, and is not intended to limit the scope of the claims, so that all technical equivalents and modifications using the contents of the specification and drawings are included in the scope of the claims.
Claims (10)
1. A nitrate wastewater treatment system, comprising:
a catalytic reduction device having a metal catalyst input and a reductant input;
the adsorption device is communicated with the catalytic reduction device;
a facultative biological treatment device, said facultative biological treatment device is communicated with said adsorption device;
a solid-liquid separation device, which is communicated with the facultative biological treatment device;
the sludge concentration device is communicated with the solid-liquid separation device; and
and the dewatering device is communicated with the sludge concentration device.
2. The nitrate wastewater treatment system according to claim 1, wherein a receiving end of the adsorption device communicates with a first wastewater output end of the catalytic reduction device, a first receiving end of the facultative biological treatment device communicates with a first discharge end of the adsorption device, a first receiving end of the solid-liquid separation device communicates with a discharge end of the facultative biological treatment device, a receiving end of the sludge concentration device communicates with a sludge discharge end of the solid-liquid separation device, and a receiving end of the dewatering device communicates with a sludge discharge end of the sludge concentration device.
3. The nitrate wastewater treatment system of claim 2, further comprising an electrolysis device, wherein a receiving end of the electrolysis device is in communication with a second discharge end of the adsorption device, and a discharge end of the electrolysis device is in communication with a regeneration liquid supply.
4. The nitrate wastewater treatment system of claim 3 wherein the adsorption device is a metal ion adsorption device and has a regenerant input.
5. The nitrate wastewater treatment system according to claim 4, further comprising a temporary storage tank, wherein a receiving end of the temporary storage tank is communicated with the first discharge end of the adsorption device, and a discharge end of the temporary storage tank is communicated with the first receiving end of the facultative biological treatment device.
6. The nitrate wastewater treatment system according to any one of claims 2 to 5, wherein a liquid discharge end of the dehydration means communicates with a second receiving end of the facultative biological treatment means.
7. The nitrate wastewater treatment system of claim 6, wherein the liquid discharge end of the dehydration engine communicates with the second receiving end of the facultative biological treatment plant through a return line.
8. The nitrate wastewater treatment system according to claim 1, further comprising a metal catalyst dosing device and a reducing agent dosing device, wherein the metal catalyst dosing device is communicated with the metal catalyst input end of the catalytic reduction device, and the reducing agent dosing device is communicated with the reducing agent input end of the catalytic reduction device.
9. The nitrate-containing wastewater treatment system of claim 1 wherein the catalytic reduction unit further comprises an acid-base agent input and a pH monitor is disposed within the catalytic reduction unit.
10. The nitrate wastewater treatment system according to claim 1, wherein the solid-liquid separation device includes a settling tank, a flotation tank, or a membrane filter.
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| CN202122854456.2U CN216236564U (en) | 2021-11-19 | 2021-11-19 | Nitrate wastewater treatment system |
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| CN202122854456.2U CN216236564U (en) | 2021-11-19 | 2021-11-19 | Nitrate wastewater treatment system |
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| CN216236564U true CN216236564U (en) | 2022-04-08 |
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