CN111977877A - Zero-emission process for quickly removing EDTA in wastewater - Google Patents
Zero-emission process for quickly removing EDTA in wastewater Download PDFInfo
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- CN111977877A CN111977877A CN202010794382.5A CN202010794382A CN111977877A CN 111977877 A CN111977877 A CN 111977877A CN 202010794382 A CN202010794382 A CN 202010794382A CN 111977877 A CN111977877 A CN 111977877A
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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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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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
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
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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
- C02F2001/007—Processes including a sedimentation step
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
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- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Removal Of Specific Substances (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention discloses a process for quickly removing EDTA (ethylene diamine tetraacetic acid) in wastewater with zero emission, which comprises the following steps of: s1, carrying out evaporation heating treatment on the wastewater containing the EDTA by virtue of an evaporator, and S5, receiving the filtered wastewater by virtue of a collecting pool; according to the invention, heat supply treatment can be effectively carried out on EDTA contained in the initial wastewater by virtue of the evaporator, so that the fusion degree of the EDTA and the water body in the wastewater is maximized, further, the EDTA wastewater conveyed by the reaction tank can be more sufficiently removed by virtue of an oxidant, thus the removal effect of the EDTA is powerfully improved, meanwhile, the treated wastewater can be effectively precipitated and filtered by virtue of the sedimentation tank and is received by virtue of the collection tank, so that the orderliness of wastewater treatment is improved, the wastewater with residual EDTA is secondarily conveyed to the initial step by virtue of the water suction pump in the collection tank through the return pipe, so that the purpose of circularly removing the EDTA residue to be maximized is achieved, and further, the removal efficiency of the EDTA in the wastewater is powerfully improved.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a zero-emission process for quickly removing EDTA in wastewater.
Background
Waste water refers to the general term of discharged water and runoff rainwater in the process of resident activity, and it includes domestic sewage, industrial wastewater and other useless water such as the runoff inflow drainage canal of first rain, generally refers to the water that can not recycle after certain technology is handled or the system purification degree of difficulty can not reach certain standard after the first grade pollution: EDTA is an organic compound, has a chemical formula of C10H16N2O8, is white powder at normal temperature and pressure, is a chelating agent capable of being combined with divalent metal ions such as Mg2+, Ca2+, Mn2+, Fe2+ and the like, and is commonly used as an inhibitor of nuclease and protease because Mg2+ is required by the action of most of nuclease and some proteases; can also be used for removing the inhibition effect of heavy metal ions on enzyme, the prior EDTA biodegradation method is only suitable for a wastewater system without heavy metal ions, because of the stability of EDTA, the biochemical treatment period of the wastewater system without heavy metal ions usually exceeds 5 days, which causes outstanding equipment and site occupation problems and overhigh one-time investment cost, the EDTA is treated by adopting an iron-carbon bed electrolysis method, because of the defects of the iron-carbon bed, the method has the problems of high power consumption and hardening of the iron-carbon bed, the method is only suitable for directly treating and discharging the electroplating or chemical plating rinsing water, can not be used for reclaimed water reuse generally required by the existing electroplating and chemical plating industries, a certain amount of EDTA still remains when the traditional wastewater treatment process is used for treating wastewater containing EDTA, thereby greatly reducing the treatment effect of the wastewater, seriously influencing the process effect of the wastewater treatment and failing to meet the requirements of the prior art.
Disclosure of Invention
In order to achieve the purpose, the invention adopts a technical scheme that: the process for quickly removing EDTA in wastewater with zero emission comprises the following steps: s1, firstly, carrying out evaporation heating treatment on waste water containing EDTA by an evaporator to accelerate the fusion of the EDTA and a water body, liquefying the fused waste gas containing the EDTA by a condenser, carrying out centralized collection on the liquefied EDTA waste water, S2, then, collecting the waste water containing the EDTA by an extractor, conveying the waste water into a storage tank capable of hermetically storing the EDTA waste water, detecting the storage amount of the EDTA waste water in the storage tank by a pressure sensor in the storage tank, hermetically storing the EDTA waste water by the storage tank, S3, then, quantitatively conveying the waste water in the storage tank into a reaction tank by an infusion apparatus, throwing an oxidant into the reaction tank, breaking the collaterals to release heavy metal ions, S4, then, adding a PH regulating reagent into the reaction tank to regulate the PH in the reaction tank, conveying the waste water in the reaction tank into a sedimentation tank by a water conveying device after the PH in the reaction tank is stabilized, carrying out filtration treatment, and S5, finally, receiving the filtered wastewater through the collection tank, detecting the content of EDTA in the wastewater in the collection tank, and when EDTA is detected to be contained in the collection tank, conveying the wastewater in the collection tank into the evaporator again for secondary treatment until the EDTA is not detected in the collection tank after the secondary treatment, and discharging the wastewater outwards.
Wherein, the time of the evaporator in the step S1 for the EDTA wastewater heat treatment is 1h30min, the temperature of the evaporator for the EDTA wastewater heat treatment is between 100 ℃ and 120 ℃, the step-by-step temperature rise is regulated and controlled, and the step-by-step temperature rise rate is 1 ℃/S.
Wherein, the storage box in step S2 is provided with an air pressure sensor and a hydraulic pressure sensor, the air pressure sensor is located at the top of the inner wall of the storage box, and the hydraulic pressure sensor is located at the bottom end of the inner wall of the storage box.
The oxidizing agent in the reaction tank in step S3 is specifically sodium hypochlorite, calcium hypochlorite, and a chlorine-containing oxidizing agent.
Wherein, the reagent for adjusting pH in the reaction tank in the step S4 is specifically one of alkali and lime, the pH is adjusted to 7 to 8, and the precipitation time in the precipitation tank is 15min to 55 min.
Wherein, a return pipe is inserted in the collecting tank in the step S5, the periphery of the return pipe is fixedly connected with a valve through a flange, the return pipe is used as a conveying mechanism for returning waste water to the evaporator, and the middle part of the return pipe is fixedly connected with a water suction pump through a flange and a screw.
Wherein the content of nickel, the content of copper and the content of cadmium in the wastewater discharged from the collecting tank in the step S5 are respectively less than 0.1mg/L, 0.3mg/L and 0.01 mg/L.
Here, the transport temperature of the secondary processing in step S5 is normal temperature.
Above scheme, through implementing the heat supply treatment by the EDTA that can be effectual to initial waste water inclusion with the help of the evaporimeter, thereby make EDTA and water body fusion degree in the waste water reach the biggest, and then make the EDTA waste water of carrying through the retort implement with the help of the oxidant and remove the time can be more abundant, thereby the powerful removal effect that has promoted EDTA, thereby simultaneously can effectually implement sediment filtration and implement through the collecting pit and receive the orderliness that promotes waste water treatment with the waste water after handling through the sedimentation tank, and thereby the waste water that will remain EDTA in the collecting pit carries to initial step through the back flow secondary with the help of the suction pump and reaches the purpose that the circulation was got rid of in order to promote and eliminate the remaining maximize of EDTA, thereby the effectual not enough among the prior art of EDTA's the efficiency of getting rid of in the waste water that.
Detailed Description
In the following, reference will be made to various embodiments of the invention. However, embodiments may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will fully convey the scope of the invention to those skilled in the art. In other instances, well-known functions or constructions may not be described or shown in detail to avoid obscuring the subject matter of the present disclosure.
The first embodiment is as follows:
in this embodiment, the method includes the following steps: s1, firstly, performing evaporation heating treatment on waste water containing EDTA by means of an evaporator to accelerate the fusion of the EDTA and a water body, wherein the content of heavy metals (Ni 2+, Fe2+, Cu2+ and Cd2 +) is 0.7g/L, the content of the EDTA is one third of the heavy metals, so as to improve the sufficiency of the combination of the EDTA and the water body and avoid the occurrence of treatment residue caused by EDTA loss, liquefying the fused waste gas containing the EDTA by a condenser, effectively obtaining the waste water of the EDTA for convenient centralized treatment by liquefying the waste gas, performing centralized collection on the liquefied EDTA waste water to make the concentration of the obtained EDTA waste water reach the maximum state, performing heat treatment on the EDTA waste water by the evaporator in the step S1 for 1h30min, facilitating the user to control by heating time of 90 min, effectively accelerating the EDTA in the original waste water for fusion by controlling the heat treatment time, and controlling the temperature of the EDTA waste water heat treatment in the evaporator to be between 100 ℃ and 120 ℃, meanwhile, the gradual temperature rise is regulated and controlled step by step, the gradual temperature rise rate is 1 ℃/S, the integration degree of EDTA and wastewater fusion can be effectively improved through the gradual temperature rise regulation and control, further, the loss of partial EDTA is avoided, the removal effect is further avoided, the gradual temperature rise is started from the normal temperature, the temperature is finally raised to 100-120 ℃, S2, then, the extraction machine is used for collecting wastewater containing EDTA, the liquefied wastewater can be intensively treated by the extraction machine, the wastewater is treated more purposefully and is conveyed into a storage tank capable of hermetically storing the EDTA wastewater, the EDTA wastewater storage amount in the storage tank is detected through an air pressure sensor in the storage tank, the EDTA wastewater can be hermetically stored by the storage tank, the treatment effect can be effectively prevented from being influenced by outflow impurities through the sealed storage, the wastewater amount and the air pressure strength can be effectively detected through the air pressure sensor arranged in the sealed storage tank, therefore, after the wastewater is treated, the data detected by the air pressure sensor can be compared to effectively obtain whether the treatment capacity of the EDTA reaches the standard or not, wherein the air pressure and the hydraulic pressure detection belong to the whole detection range for conventional detection, the air pressure sensor and the hydraulic pressure sensor are arranged in the storage tank in the step S2, the hydraulic pressure detection can be effectively carried out on the wastewater in the storage tank by matching with the air pressure sensor through the hydraulic pressure sensor, so that the accuracy of the detected data is improved, the air pressure sensor is positioned at the top of the inner wall of the storage tank, the hydraulic pressure sensor is positioned at the bottom end of the inner wall of the storage tank, S3, then, the wastewater in the storage tank is quantitatively conveyed into the reaction tank through the infusion apparatus, so that the dosage of the wastewater is matched to achieve the best treatment effect when the EDTA is treated, an oxidant is put into the reaction, in step S3, the oxidizing agent in the reaction tank is specifically sodium hypochlorite, calcium hypochlorite and chlorine-containing oxidizing agent, the sodium hypochlorite, calcium hypochlorite and chlorine-containing oxidizing agent can effectively react with EDTA in the wastewater to break the complex and release heavy metals and ions, wherein the adding amount of the sodium hypochlorite, calcium hypochlorite and chlorine-containing oxidizing agent is calculated according to the detection content standard of the EDTA, S4, then, a pH adjusting reagent is added into the reaction tank to adjust the pH in the reaction tank, the reagent for adjusting the pH in the reaction tank in step S4 is specifically one of alkali and lime, the pH is adjusted to 7 to 8, meanwhile, after the pH in the reaction tank is stabilized, the wastewater in the reaction tank is conveyed to a sedimentation tank by a water conveyer to be filtered, and the sedimentation time in the sedimentation tank is 15 to 55min, so that the complete removal effect of the EDTA wastewater is realized, determination of the pH value: because the optimal pH value condition in the general process for removing COD by oxidizing the Fenton reagent is between 3 and 5, and the optimal pH value of EDTA (ethylene diamine tetraacetic acid) by an iron-carbon bed method is about 2 according to the prior document, the method adopts the pH value between 2 and 3, S5, finally, the filtered wastewater is received by a collecting tank, the content of the EDTA in the wastewater in the collecting tank is detected, the wastewater in the collecting tank is conveyed to an evaporator for secondary treatment again when the EDTA is detected to be contained in the collecting tank, the effect of circularly removing the residual EDTA wastewater is realized, the removal effect of the EDTA is maximized, the conveying temperature of the secondary treatment in the step S5 is normal temperature, the wastewater in the normal temperature state can be effectively heated by the evaporator in the S1 to realize the circular treatment effect, and the EDTA is discharged outwards until the EDTA is not detected in the collecting tank after the secondary treatment, thereby guarantee that the discharged waste water does not contain the treatment effect of EDTA, it has the back flow to peg graft in the collecting pit in step S5, and the back flow periphery has the valve through flange fixedly connected with, can implement transport control to the waste water in the back flow pipe through the valve, the back flow is used for flowing back to the transport mechanism in the evaporimeter as waste water, the back flow middle part has the suction pump through flange and screw fixedly connected with, can effectively provide power for the waste water backward flow through the suction pump, the content of nickel is less than 0.1mg/L, the content of copper is less than 0.3mg/L and the content of cadmium is less than 0.01mg/L in the waste water that discharges in the collecting pit in step S5.
Example two:
in this embodiment, the method includes the following steps: s2, the wastewater containing EDTA is collected through the extractor, the liquefied wastewater can be treated in a centralized way through the extractor, the wastewater is treated more purposefully and is conveyed into a storage box capable of storing the EDTA wastewater in a sealing way, the EDTA wastewater storage quantity in the storage box is detected through an air pressure sensor in the storage box, the EDTA wastewater can be stored in a sealing way through the storage box, the treatment effect can be effectively prevented from being influenced by outflow impurities through the sealing way, the wastewater quantity and the air pressure strength can be effectively detected through the air pressure sensor arranged in the sealed storage box, so that whether the treatment quantity of the EDTA reaches the standard or not can be effectively obtained through comparing the data detected by the air pressure sensor after the wastewater treatment, wherein the air pressure and the hydraulic pressure detection belong to the whole detection range, and the air pressure sensor and the hydraulic pressure sensor are arranged in the storage box in the step S2, can effectual cooperation baroceptor implement hydraulic pressure through hydraulic pressure sensor and detect to the waste water in the storage box, thereby promote the accuracy that detects the data, and baroceptor is located the inner wall top of storage box, hydraulic pressure sensor is located the inner wall bottom of storage box, S3, then, carry the waste water ration in the storage box to the retort through the transfusion system, make the waste water dose match when handling EDTA in order to reach best treatment effect, and put into the oxidant in the retort, the reaction breaks the net and releases heavy metal with the ion, thereby further promote the treatment effeciency of waste water, the oxidant in the retort in step S3 is specifically sodium hypochlorite, calcium hypochlorite and chlorine-containing oxidant, can effectually carry out the reaction to the EDTA in the waste water through sodium hypochlorite, calcium hypochlorite and chlorine-containing oxidant thereby break the net and release heavy metal with the ion, wherein sodium hypochlorite, sodium hypochlorite, The required adding amount of calcium hypochlorite and a chlorine-containing oxidant is calculated according to the detection content standard of EDTA actually detected, S4, a PH adjusting reagent is added into a reaction tank to adjust the PH in the reaction tank, the reagent used for adjusting the PH in the reaction tank in the step S4 is specifically one of alkali and lime, the PH is adjusted to 7-8, meanwhile, after the PH in the reaction tank is stabilized, waste water in the reaction tank is conveyed to a sedimentation tank by a water conveyer to be filtered, and the sedimentation time in the sedimentation tank is 15-55 min, so that the complete removal effect of EDTA waste water is realized, and the pH value is determined: because the optimal pH value condition in the general process for removing COD by oxidizing the Fenton reagent is between 3 and 5, and the optimal pH value of EDTA (ethylene diamine tetraacetic acid) by an iron-carbon bed method is about 2 according to the prior document, the method adopts the pH value between 2 and 3, S5, finally, the filtered wastewater is received by a collecting tank, the content of the EDTA in the wastewater in the collecting tank is detected, the wastewater in the collecting tank is conveyed to an evaporator for secondary treatment again when the EDTA is detected to be contained in the collecting tank, the effect of circularly removing the residual EDTA wastewater is realized, the removal effect of the EDTA is maximized, the conveying temperature of the secondary treatment in the step S5 is normal temperature, the wastewater in the normal temperature state can be effectively heated by the evaporator in the S1 to realize the circular treatment effect, and the EDTA is discharged outwards until the EDTA is not detected in the collecting tank after the secondary treatment, thereby guarantee that the discharged waste water does not contain the treatment effect of EDTA, it has the back flow to peg graft in the collecting pit in step S5, and the back flow periphery has the valve through flange fixedly connected with, can implement transport control to the waste water in the back flow pipe through the valve, the back flow is used for flowing back to the transport mechanism in the evaporimeter as waste water, the back flow middle part has the suction pump through flange and screw fixedly connected with, can effectively provide power for the waste water backward flow through the suction pump, the content of nickel is less than 0.1mg/L, the content of copper is less than 0.3mg/L and the content of cadmium is less than 0.01mg/L in the waste water that discharges in the collecting pit in step S5.
In the several embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules or units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
Claims (8)
1. The process for quickly removing EDTA in wastewater with zero emission is characterized by comprising the following steps of:
s1, firstly, evaporating and heating the waste water containing EDTA by means of an evaporator to accelerate the fusion of EDTA and a water body, liquefying the fused waste gas containing EDTA by a condenser, and carrying out centralized collection on the liquefied EDTA waste water;
s2, collecting the EDTA-containing wastewater through an extractor, conveying the EDTA-containing wastewater into a storage tank capable of hermetically storing the EDTA wastewater, detecting the storage amount of the EDTA wastewater in the storage tank through an air pressure sensor in the storage tank, and hermetically storing the EDTA wastewater through the storage tank;
s3, quantitatively conveying the wastewater in the storage tank to a reaction tank through an infusion apparatus, and adding an oxidant into the reaction tank to react and break the complex so as to release heavy metal ions;
s4, adding a PH regulating reagent into the reaction tank to regulate the PH in the reaction tank, and after the PH in the reaction tank is stable, conveying the wastewater in the reaction tank to a sedimentation tank by a water conveyer to carry out filtration treatment;
and S5, finally, receiving the filtered wastewater through the collection tank, detecting the content of EDTA in the wastewater in the collection tank, and when EDTA is detected to be contained in the collection tank, conveying the wastewater in the collection tank into the evaporator again for secondary treatment until the EDTA is not detected in the collection tank after the secondary treatment, and discharging the wastewater outwards.
2. The process of claim 1, wherein the time for the evaporator to perform the heat treatment on the EDTA wastewater in step S1 is 1h30min, the temperature for performing the heat treatment on the EDTA wastewater in the evaporator is between 100 ℃ and 120 ℃, and the gradual temperature rise is controlled at a rate of 1 ℃/S.
3. The process of claim 1, wherein a pneumatic sensor and a hydraulic sensor are disposed in the storage tank in step S2, the pneumatic sensor is located at the top of the inner wall of the storage tank, and the hydraulic sensor is located at the bottom end of the inner wall of the storage tank.
4. The process for rapidly removing zero emission of EDTA in wastewater according to claim 1, wherein the oxidants in the reaction tank of step S3 are sodium hypochlorite, calcium hypochlorite and chlorine-containing oxidants.
5. The process of claim 1, wherein the reagent for adjusting pH in the reaction tank of step S4 is one of alkali and lime, the pH is adjusted to 7 to 8, and the settling time in the settling tank is 15min to 55 min.
6. The process of claim 1, wherein a return pipe is inserted into the collection tank in step S5, a valve is fixedly connected to the periphery of the return pipe through a flange, the return pipe is used as a transfer mechanism for returning wastewater to the evaporator, and a water pump is fixedly connected to the middle of the return pipe through a flange and a screw.
7. The process of claim 1, wherein the content of nickel, the content of copper and the content of cadmium in the wastewater discharged from the collecting tank in the step S5 are respectively less than 0.1mg/L, 0.3mg/L and 0.01 mg/L.
8. The process for rapidly removing zero emission of EDTA in wastewater according to claim 1, wherein the transportation temperature of the secondary treatment in step S5 is normal temperature.
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| CN202010794382.5A CN111977877A (en) | 2020-08-10 | 2020-08-10 | Zero-emission process for quickly removing EDTA in wastewater |
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| JPH05115884A (en) * | 1991-05-10 | 1993-05-14 | Westinghouse Electric Corp <We> | Method for recovering ethylenediamine tetraacetate from evaporator cleaning liquid |
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| JPH05115884A (en) * | 1991-05-10 | 1993-05-14 | Westinghouse Electric Corp <We> | Method for recovering ethylenediamine tetraacetate from evaporator cleaning liquid |
| US5632900A (en) * | 1995-04-19 | 1997-05-27 | The Babcock & Wilcox Company | Wet oxidation method of treating chelate bearing waste solutions |
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| CN104359637A (en) * | 2014-12-09 | 2015-02-18 | 中国包装科研测试中心 | Airtight and hydraulic comprehensive detector of packaging container |
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Application publication date: 20201124 |