CN112456699A - COD detection waste liquid treatment equipment and process - Google Patents
COD detection waste liquid treatment equipment and process Download PDFInfo
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- CN112456699A CN112456699A CN202011491007.XA CN202011491007A CN112456699A CN 112456699 A CN112456699 A CN 112456699A CN 202011491007 A CN202011491007 A CN 202011491007A CN 112456699 A CN112456699 A CN 112456699A
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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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- 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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
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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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/285—Treatment of water, waste water, or sewage by sorption using synthetic organic sorbents
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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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46109—Electrodes
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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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
- C02F1/4676—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electroreduction
- C02F1/4678—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electroreduction of metals
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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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
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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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46109—Electrodes
- C02F2001/46133—Electrodes characterised by the material
- C02F2001/46138—Electrodes comprising a substrate and a coating
- C02F2001/46142—Catalytic coating
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/22—Chromium or chromium compounds, e.g. chromates
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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
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/46—Apparatus for electrochemical processes
- C02F2201/461—Electrolysis apparatus
- C02F2201/46105—Details relating to the electrolytic devices
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- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
A COD detection waste liquid treatment device and a process thereof are provided, wherein the COD detection waste liquid treatment device comprises a liquid storage tank, a silver removal reactor connected with the liquid storage tank, a first suction filtration device connected with the silver removal reactor, a neutralization reactor connected with the suction filtration device, a plate-and-frame filter press trained with the neutralization reactor, an electrodeposition unit connected with the plate-and-frame filter press, a second suction filtration device connected with the electrodeposition unit, and a resin adsorption device connected with the second suction filtration device; the silver removal reactor and the first suction filtration device form a silver removal unit, and the neutralization reactor and the plate-and-frame filter press form a neutralization unit; the invention adopts a process of combining various methods such as chemistry, electrochemical deposition, resin adsorption and the like to efficiently remove various pollutants in the COD detection waste liquid, so that the effluent reaches the standard of direct discharge.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of wastewater treatment, in particular to a COD detection waste liquid treatment device and a process.
[ background of the invention ]
The waste liquid acidity of COD determined by the potassium dichromate method is high, and the contents of heavy metals of mercury, chromium and silver are high. If the waste water is directly discharged without being treated, serious pollution is caused.
According to GB 11914-89 potassium dichromate determination by chemical oxygen demand method, the reagents used in COD experiments are as follows: potassium dichromate standard solution (K2C2O 7; 0.250mol/L), silver sulfate-sulfuric acid reagent (10g silver dissolved in 1L concentrated sulfuric acid), mercury sulfate (HgSO4), ammonium ferrous sulfate reagent (NH4)2Fe (SO4)2, H+、Cr6+、Ag+、Hg2+These indexes are all seriously out of standard, and the waste liquid can be discharged after being treated.
The COD experimental waste liquid has extremely low pH value and simultaneously contains various high-concentration high heavy metals Cr6+、Hg2+Ag +; the concentration of the three heavy metals, particularly mercury, reaches more than 1g/L, and the three heavy metal ions are the heavy metal elements with higher harmfulness determined at present; they exist stably in the environment, cannot be decomposed and removed, and can only be converted in space and valence states; the heavy metal compounds have high toxicity to organisms, can be enriched in the organisms and finally harm the health of human bodies through food chains, and when the content of heavy metals in the human bodies reaches a critical value, the heavy metal compounds have influence on the normal physiological health of the human bodies and finally cause various diseases; in addition, if the heavy metal silver in the waste liquid can be recovered, certain economic benefit can be brought.
However, in view of the present, only a few students pay attention to the treatment technology of the waste liquid, but all concentrate on a single heavy metal and adopt a single treatment process, and the treatment of the waste liquid with coexistence of a plurality of similar heavy metals and higher content is rarely involved.
Therefore, the development of a water treatment device and a water treatment process for treating waste COD detection liquid is urgent.
[ summary of the invention ]
In order to solve the problems, the invention provides COD detection waste liquid treatment equipment which is characterized by comprising a liquid storage tank, a silver removal reactor connected with the liquid storage tank, a first suction filtration device connected with the silver removal reactor, a neutralization reactor connected with the suction filtration device, a plate-and-frame filter press refined with the neutralization reactor, an electrodeposition unit connected with the plate-and-frame filter press, a second suction filtration device connected with the electrodeposition unit, and resin adsorption equipment connected with the second suction filtration device; the silver removing reactor and the first suction filtration device form a silver removing unit, and the neutralization reactor and the plate-and-frame filter press form a neutralization unit.
Further, install 54L/H concentrated acid pump on the liquid storage pot, the desilvering reactor includes inside mixer, 1L/H adds salt pump and titanium filter, first suction filter device includes 10L buchner flask, air pump and vacuum pump.
Further, the neutralization reactor comprises a 54L/H concentrated acid pump, a stirrer, a 54L/H plus-minus pump and a temperature probe, the electrodeposition unit comprises an electrodeposition reactor, a miniature magnetic pump and a power supply, and the second suction filtration device comprises a titanium filter, a 20L suction filtration bottle and an air pump.
A treatment process of waste liquid treatment equipment comprises the following steps:
the method comprises the following steps: removing Ag + in the waste liquid through a silver removing unit, and recycling the precipitate;
step two: removing Cr in waste liquid through a neutralization reaction unit6+And Hg2+；
Step three: the metal ions in the waste liquid are reduced by the reduction reaction of the electro-deposition unit, and pollutants are eliminated;
step four: residual heavy metal ions in the solution are absorbed and recovered through resin absorption equipment, so that the content of the heavy metal in the absorbed liquid reaches the national specified effluent standard.
Further, in the first step, sodium chloride solution is adopted to react with the waste liquid, and silver chloride is generated and precipitated at the bottom of the silver removal reactor.
Further, in the second step, a saturated sodium hydroxide solution is adopted to react with the waste liquid until the PH value is neutral.
Furthermore, the anodes of the electrodeposition units in the third step are DSA anodes, titanium plates are used as base materials, and a plurality of metal oxide composite catalysts are coated and sintered on the surfaces of the titanium plates.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention adopts a process of combining various methods such as chemistry, electrochemical deposition, resin adsorption and the like to efficiently remove various pollutants in the COD detection waste liquid, so that the effluent reaches the standard of direct discharge.
2. The method realizes the recycling of Ag, Cr and Hg elements, and overcomes the defect that a large amount of solid waste is generated to pollute the environment by a conventional single method.
3. The electrodeposition reactor adopts the DSA anode as the anode, takes the titanium plate as the base material, coats and sinters various metal oxide composite catalysts on the surface, does not bring any pollutant under electrochemical reaction compared with the rest anodes, and can adsorb the reduced heavy metal at the cathode.
[ description of the drawings ]
FIG. 1 is a process flow diagram of the present invention.
[ detailed description ] embodiments
The directional terms of the present invention, such as "up", "down", "front", "back", "left", "right", "inner", "outer", "side", etc., are only directions in the drawings, and are only used to explain and illustrate the present invention, but not to limit the scope of the present invention.
Referring to fig. 1, a process flow diagram of the COD detection waste liquid treatment apparatus and process of the present invention is given, wherein the treatment apparatus comprises a liquid storage tank 1, a silver removal reactor 2 connected to the liquid storage tank, a first suction filtration device 3 connected to the silver removal reactor, a neutralization reactor 4 connected to the suction filtration device, a plate-and-frame filter press 5 connected to the neutralization reactor, an electrodeposition unit 6 connected to the plate-and-frame filter press, a second suction filtration device 7 connected to the electrodeposition unit, and a resin adsorption apparatus 8 connected to the second suction filtration device; the silver removing reactor 2 and the first suction filtration device 3 form a silver removing unit, and the neutralization reactor 4 and the plate-and-frame filter press 5 form a neutralization unit.
Install 54L/H concentrated acid pump on the liquid storage pot 1, desilvering reactor 2 includes inside mixer, 1L/H adds salt pump and titanium filter, first suction filtration device 3 includes 10L buchner flask, air pump and vacuum pump, neutralization reactor 4 includes 54L/H concentrated acid pump, mixer, 54L/H add and subtract pump and temperature probe, electrodeposition unit 6 includes electrodeposition reactor, miniature magnetic drive pump and power, second suction filtration device 7 includes titanium filter, 20L buchner flask and air pump.
The technological process of the COD detection waste liquid treatment equipment and the technology of the invention is as follows:
a chemical feeding port is formed in the silver removing reactor 2, waste liquid in the liquid storage tank 1 is conveyed into the silver removing reactor through a 54L/H concentrated acid pump, a sodium chloride solution is added into the silver removing reactor through the chemical feeding port and is stirred to be fully reflected, generated silver chloride forms a precipitate at the bottom of the silver removing reactor, and the reacted liquid enters the neutralization reactor 4 through a first suction filtration device to be subjected to next neutralization reaction; because the solubility of the silver chloride is extremely low, most of Ag & lt + & gt in the waste liquid can be removed through the process, and the silver chloride precipitated at the bottom of the silver removal reactor can be taken out and dried after the water is drained, so that the silver chloride can be recycled.
The neutralization reactor 4 is provided with a dosing port, after the waste liquid enters the neutralization reactor from the silver removing unit, saturated sodium hydroxide solution is added through the dosing port, the mixture is stirred to fully react until the PH is neutral, and the generated mercury and chromium are precipitated at the bottom of the neutralization reactor because of the Cr6+And Hg2+So that only a part of Cr can be removed by this unit reaction6+And Hg2+And the waste liquid is subjected to filter pressing by a plate-and-frame filter press 5 and then enters the next step of electrodeposition reaction, and generated solid is collected and recycled.
The electro-deposition unit comprises an anode and a cathode, wherein electrochemical reduction mainly occurs at the cathode, pollutants are eliminated by reduction reaction, metal ions can be reduced, the cathode can be made of materials such as iron, aluminum and the like, and the cathode is not corroded in the reaction process and is used as a carrier attached to the reduced metal ions in liquid; electrochemical reduction can recover metals, reduce the toxicity of some substances, and the like, for example, hexavalent chromium is reduced into trivalent chromium, organic chloride is electrically reduced into low-toxicity substances, and the biodegradability of the product is improved.
Besides the direct occurrence of the electro-reduction reaction, the pollutants can be removed by some intermediate products produced by the electro-reduction reaction.
The anode is a DSA anode, a titanium plate is used as a base material, and a plurality of metal oxide composite catalysts (MOx) are coated and sintered on the surface of the titanium plate, so that the longer service life of the electrode can be obtained.
Meanwhile, the electrodeposition reactor adopts a water inlet and outlet mode of lower inlet and upper outlet, so that the waste liquid is fully subjected to reduction reaction in the reactor.
The resin adsorption device 8 contains cation adsorption resin and is used for adsorbing and recovering heavy metal ions remained in the solution, so that the content of the heavy metal in the adsorbed liquid reaches the national water outlet standard.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. The COD detection waste liquid treatment equipment is characterized by comprising a liquid storage tank (1), a silver removal reactor (2) connected with the liquid storage tank, a first suction filtration device (3) connected with the silver removal reactor, a neutralization reactor (4) connected with the suction filtration device, a plate-and-frame filter press (5) refined by the neutralization reactor, an electrodeposition unit (6) connected with the plate-and-frame filter press, a second suction filtration device (7) connected with the electrodeposition unit, and resin adsorption equipment (8) connected with the second suction filtration device; the silver removing reactor (2) and the first suction filtration device (3) form a silver removing unit, and the neutralization reactor (4) and the plate-and-frame filter press (5) form a neutralization unit.
2. The COD detection waste liquid treatment equipment according to claim 1, wherein a 54L/H concentrated acid pump is installed on the liquid storage tank (1), the silver removal reactor (2) comprises an internal stirrer, a 1L/H salt adding pump and a titanium filter, and the first suction filtration device (3) comprises a 10L suction filtration bottle, an air pump and a vacuum pump.
3. The COD detection waste liquid treatment equipment according to claim 1, wherein the neutralization reactor (4) comprises a 54L/H concentrated acid pump, a stirrer, a 54L/H plus-minus pump and a temperature probe, the electrodeposition unit (6) comprises an electrodeposition reactor, a micro magnetic pump and a power supply, and the second suction filtration device (7) comprises a titanium filter, a 20L suction filtration bottle and an air pump.
4. A treatment process based on the waste liquid treatment apparatus according to claim 1, characterized in that the treatment process comprises the steps of:
the method comprises the following steps: removing Ag + in the waste liquid through a silver removing unit, and recycling the precipitate;
step two: removing Cr in waste liquid through a neutralization reaction unit6+And Hg2+；
Step three: the metal ions in the waste liquid are reduced by the reduction reaction of the electro-deposition unit, and pollutants are eliminated;
step four: residual heavy metal ions in the solution are absorbed and recovered through resin absorption equipment, so that the content of the heavy metal in the absorbed liquid reaches the national specified effluent standard.
5. The waste liquid treatment process as claimed in claim 4, wherein in the first step, the sodium chloride solution is adopted to react with the waste liquid, and the generated silver chloride is precipitated at the bottom of the silver removal reactor.
6. The process of claim 4, wherein in the second step, a saturated sodium hydroxide solution is used to react with the waste liquid until the pH is neutral.
7. The waste liquid treatment process according to claim 4, wherein the anodes of the electrodeposition unit in the third step are DSA anodes, and a titanium plate is used as a base material, and a plurality of metal oxide composite catalysts are coated and sintered on the surface of the titanium plate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011491007.XA CN112456699A (en) | 2020-12-17 | 2020-12-17 | COD detection waste liquid treatment equipment and process |
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| CN202011491007.XA CN112456699A (en) | 2020-12-17 | 2020-12-17 | COD detection waste liquid treatment equipment and process |
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| CN112456699A true CN112456699A (en) | 2021-03-09 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103288231A (en) * | 2013-04-16 | 2013-09-11 | 山东益源环保科技有限公司 | Industrial treatment process for CODCr waste liquid |
| CN203487272U (en) * | 2013-09-29 | 2014-03-19 | 上海轻工业研究所有限公司 | Electrodeposition device and electrodeposition anode thereof |
| CN104211243A (en) * | 2014-09-30 | 2014-12-17 | 四川悦承环保节能科技有限公司 | Method for removing silver, mercury and chromium in CODCr (Chemical Oxygen Demand) online monitoring waste liquor |
| CN105906105A (en) * | 2016-06-13 | 2016-08-31 | 深圳市绿恩环保技术有限公司 | Processing method of COD measurement wastewater |
-
2020
- 2020-12-17 CN CN202011491007.XA patent/CN112456699A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103288231A (en) * | 2013-04-16 | 2013-09-11 | 山东益源环保科技有限公司 | Industrial treatment process for CODCr waste liquid |
| CN203487272U (en) * | 2013-09-29 | 2014-03-19 | 上海轻工业研究所有限公司 | Electrodeposition device and electrodeposition anode thereof |
| CN104211243A (en) * | 2014-09-30 | 2014-12-17 | 四川悦承环保节能科技有限公司 | Method for removing silver, mercury and chromium in CODCr (Chemical Oxygen Demand) online monitoring waste liquor |
| CN105906105A (en) * | 2016-06-13 | 2016-08-31 | 深圳市绿恩环保技术有限公司 | Processing method of COD measurement wastewater |
Non-Patent Citations (2)
| Title |
|---|
| 李富祥 等: "沉淀－中和－共沉淀处理CＯＤＣｒ测定废液", vol. 16, no. 16, pages 302 - 305 * |
| 郭忠诚 等: "湿法冶金电极新材料制备技术及应用", 郭忠诚 等, pages: 11 - 13 * |
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