CN111115977A - Method and system for treating quinacridone production wastewater - Google Patents

Method and system for treating quinacridone production wastewater Download PDF

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Publication number
CN111115977A
CN111115977A CN202010053584.4A CN202010053584A CN111115977A CN 111115977 A CN111115977 A CN 111115977A CN 202010053584 A CN202010053584 A CN 202010053584A CN 111115977 A CN111115977 A CN 111115977A
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treatment
stripping
sewage
wastewater
tower
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徐辉
杜倩
罗含
张永泽
张伟华
陈金心
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Yueyang Paper Co ltd
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Yueyang Paper Co ltd
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00Multistage treatment of water, waste water, or sewage
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/02Treatment of water, waste water, or sewage by heating
    • C02F1/04Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/28Treatment of water, waste water, or sewage by sorption
    • C02F1/283Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/38Treatment of water, waste water, or sewage by centrifugal separation
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/52Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/72Treatment of water, waste water, or sewage by oxidation
    • C02F1/722Oxidation by peroxides
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/72Treatment of water, waste water, or sewage by oxidation
    • C02F1/78Treatment of water, waste water, or sewage by oxidation with ozone
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/30Organic compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/30Aerobic and anaerobic processes

Abstract

The invention belongs to the technical field of wastewater treatment and discloses a method and a system for treating wastewater generated in quinacridone production, wherein the wastewater generated in the quinacridone production is treated by adopting the steps of physicochemical treatment, solvent recovery in wastewater, oxidation stripping of wastewater, biochemical treatment, advanced treatment and the like, a physicochemical device, a recovery device, an oxidation stripping device, a biochemical treatment device and an advanced treatment device are adopted to treat the wastewater, a filter screen is arranged on a water outlet of the physicochemical device, the invention aims to provide a method and a system for treating quinacridone production wastewater, which are internally provided with a scraper to ensure the continuous operation of the whole device, combine physicochemical separation, chemical separation, biochemical treatment, advanced oxidation and advanced treatment, fully exert the respective advantages, the method saves the wastewater treatment cost to the maximum extent on the basis of ensuring the recovery of the solvent and further removing the organic matters, and ensures that the wastewater reaches the standard and is discharged.

Description

Method and system for treating quinacridone production wastewater
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a method and a system for treating quinacridone production wastewater.
Background
The synthesis method of quinacridone is the same as that of quinacridone red, and the process is different in the oxidation step due to different crystal forms, the oxidation method of β type quinacridone is as follows, adding industrial ethanol, water and industrial solid caustic soda, stirring, then adding refined filter cake of 6, 13-dihydro quinacridone, stirring for 30min, adding sodium m-nitrobenzenesulfonate, heating and refluxing for 4h, cooling to room temperature, then adding cold water, naturally releasing, stirring for half an hour, press filtering, recovering solvent, and drying the filter cake at 70 ℃ to obtain the quinacridone.
The quinacridone production wastewater has the characteristics of small wastewater quantity, high organic pollutant content, high chromaticity, large water quality change and the like; at present, the quinacridone wastewater treatment is generally carried out by incineration treatment, but as part of areas have no incineration conditions, other treatment measures are required to reach the standard of the wastewater treatment; for example, the application No. CN201010100762.0 describes a method for treating quinacridone pigment intermediate wastewater and a modified macroporous adsorbent resin used therein, which is a method for treating quinacridone pigment intermediate wastewater, wherein sewage is treated by the method of acidifying and precipitating sewage and then adsorbing the sewage by the modified macroporous adsorbent resin, and the sewage treated by the method contains a large amount of ethanol, so that a large amount of ethanol solution is wasted and the production cost of quinacridone is increased.
Patent document CN201810743382.5 discloses a method for treating aniline wastewater by using a tubular reactor, which comprises adding a certain amount of acid into aniline wastewater, acidifying, pumping the acidified aniline wastewater and sodium nitrite solution into the tubular reactor from different pipelines respectively, diazotizing the obtained diazonium salt, discharging the diazonium salt from another outlet, coupling with azo pigment wastewater (containing a small amount of organic matter capable of coupling with the diazonium salt), transferring the coupling solution to a settling tank, separating, discharging the filtrate to a sewage treatment plant for further treatment, drying the filter residue, and burning the filter residue.
Disclosure of Invention
The invention aims to solve the problems, and provides a method and a system for treating quinacridone production wastewater, which combine physicochemical separation, chemical separation, biochemical treatment, advanced oxidation and advanced treatment, give full play to respective advantages, save wastewater treatment cost to the greatest extent on the basis of ensuring solvent recovery and further removing organic matters, and ensure that the wastewater reaches the standard and is discharged.
In order to realize the purpose, the invention adopts the technical scheme that: a quinacridone production wastewater treatment method comprises the following steps:
(A) and materialization treatment: firstly, introducing sewage into a physicochemical treatment device, then adding a flocculating agent for flocculation reaction for 2-3h, and continuously stirring the sewage in the device after adding the flocculating agent;
(B) and recovering the solvent in the sewage: introducing the sewage treated in the step (A) into an evaporation tower through a water pump for distillation, wherein the distillation temperature is 70-80 ℃, introducing the evaporated gas into a condensation recovery device for condensation recovery, and stopping evaporation when the concentration of the condensed gas is lower than 90%; simultaneously, flocculate in the physicochemical treatment device is led into a horizontal centrifuge for centrifugal operation, and the centrifugal time is 30-50 min.
(C) Oxidizing and stripping sewage: introducing the sewage treated in the step (B) into a stripping tower for stripping operation, introducing ozone into the stripping tower through a gas inlet pipe of the stripping tower to perform oxidation stripping on organic matters in the sewage, stopping the oxidation stripping operation when the COD (chemical oxygen demand) content of the sewage at the bottom of the stripping tower is lower than 5000mg/L, and finally enabling the residual gas carrying the organic matters to overflow from the top of the stripping tower and enter a tail gas absorption device;
(D) and biochemical treatment: carrying out three different biochemical treatments of anaerobic treatment, anoxic treatment and aerobic treatment on the sewage treated in the step (C);
(E) and deep treatment: performing advanced treatment on the sewage in the step (E), wherein the advanced treatment is one or more of an activated carbon technology, a Fenton oxidation technology and an ozone technology; the deep treatment time is 1-2 h.
Further, the flocculating agent in the step (A) is one or more of polyaluminium chloride, polyferric chloride and polyferric sulfate.
Further, the addition amount of the flocculating agent in the step (A) is controlled to be 2.0-8.0% of the volume of the wastewater; the flocculant is a solution with the medium solid accounting for 0.1-0.5% of the solvent.
A quinacridone production wastewater treatment system comprises a materialization device, a recovery device, an oxidation stripping device, a biochemical treatment device and an advanced treatment device, wherein one end of the materialization device is connected with production wastewater drainage, the other end of the materialization device is connected with the recovery device, a water outlet of the recovery device is connected with the oxidation stripping device, one end of the biochemical treatment device is connected with a water outlet of the oxidation stripping device, and the other end of the biochemical treatment device is connected with a water inlet of the advanced treatment device; the device comprises a materialization device, a driving device, a stirring shaft, a scraper blade, a water inlet, a water outlet, a filter screen, a stirring tooth, a bearing and a driving device, wherein one end of the materialization device is provided with the water inlet, the other end of the materialization device is provided with the water outlet, the filter screen is arranged on the water outlet, the stirring shaft is arranged in the materialization device, the stirring shaft is provided with the stirring tooth, the stirring blade is arranged on the; a flocculant dissolving device is arranged on the materialization device; the recovery device comprises an evaporation tower and a condensing device; the bottom of the materialization device is provided with a flocculate discharge port.
Furthermore, an air outlet at the top of the evaporation tower is connected with a condensing device, the condensing device is a shell-and-tube heat exchanger, and a condensed water outlet of the condensing device is connected with a recovery device.
Furthermore, a stirring rod is arranged in the middle of the flocculant dissolving device, a material hopper and a water inlet are arranged on the side wall of the flocculant dissolving device, the end part of the stirring rod is connected with a driving motor, the top of the stirring rod is connected with the flocculant dissolving device through a bearing, and a heat exchange coil is arranged on the inner wall of the flocculant dissolving device.
Furthermore, a steam heating pipe is arranged in the middle of the evaporation tower, and the heat exchange coil is connected with the steam heating pipe through a pipeline.
Further, the oxidation stripping device comprises a stripping tower, and an air inlet of the stripping tower is connected with an air pump through an ozone generator; and a gas outlet at the top of the stripping tower is connected with a tail gas adsorption device.
Furthermore, the biochemical treatment device comprises an anaerobic treatment tank, an anoxic treatment tank and an aerobic treatment tank, wherein the anaerobic treatment tank, the anoxic treatment tank and the aerobic treatment tank are connected through pipelines.
Further, the advanced treatment device is a Fenton oxidation device.
The invention has the beneficial effects that:
1. the invention adopts the solvent recovery unit to recover and reuse most of the solvent, thereby reducing the production cost and ensuring the maximum utilization of resources; the two technologies of oxidation and steam stripping are coupled, and the organic matter which is difficult to degrade can be directionally decomposed into micromolecular organic matter through the generated ozone, so that the biodegradability of the wastewater is improved; meanwhile, the organic matters in the wastewater are further reduced by air stripping, so that the subsequent biochemical unit and advanced treatment are facilitated.
2. The invention combines physicochemical separation, chemical separation, biochemical treatment, advanced oxidation and advanced treatment, fully exerts respective advantages, saves the wastewater treatment cost to the maximum extent on the basis of ensuring the solvent recovery and further removing organic matters, and ensures that the wastewater reaches the standard and is discharged.
Drawings
Fig. 1 is a schematic front view of the present invention.
FIG. 2 is a schematic front view of the materialization apparatus of the present invention.
FIG. 3 is a schematic view of the flocculant dissolving apparatus according to the present invention.
The text labels in the figures are represented as: 1. a materialization device; 11. a water inlet; 12. a water outlet; 121. filtering with a screen; 13. a stirring shaft; 131. a squeegee; 14. stirring teeth; 15. a drive device; 16. a floc discharge port; 2. a recovery device; 21. an evaporation tower; 211. a steam heating pipe; 22. a condensing unit; 23. a recovery device; 3. an oxidation stripping unit; 31. a stripping column; 32. an ozone generator; 33. an air pump; 34. a tail gas adsorption device; 4. a biochemical treatment device; 41. an anaerobic treatment tank; 42. an anoxic treatment tank; 43. an aerobic treatment tank; 5. a depth processing device; 6. a flocculant dissolving device; 61. a stirring rod; 62. a material hopper; 63. a water inlet; 65. a drive motor; 66. a heat exchange coil.
Detailed Description
The following detailed description of the present invention is given for the purpose of better understanding technical solutions of the present invention by those skilled in the art, and the present description is only exemplary and explanatory and should not be construed as limiting the scope of the present invention in any way.
The embodiment is to treat the industrial wastewater of a certain enterprise, wherein the wastewater mainly contains quinacridone, high-concentration ethanol, and refractory organic matter sodium m-nitrobenzenesulfonate and the like.
Example 1, a quinacridone production wastewater treatment method, includes the following steps:
(A) and materialization treatment: firstly, introducing sewage into a physicochemical treatment device, then adding PAC and PAM into the sewage for flocculation operation, and continuously stirring the sewage in the device for flocculation after adding a flocculating agent, wherein the flocculation time is 2 h;
(B) and recovering the solvent in the sewage: introducing the sewage treated in the step (A) into an evaporation tower through a water pump for distillation, wherein the distillation temperature is 70 ℃, introducing the evaporated gas into a condensation recovery device for condensation recovery, and stopping evaporation when the concentration of a condensation recovery liquid is lower than 90% for next operation; simultaneously, flocculate in the physicochemical treatment device is led into a horizontal centrifuge for centrifugal operation, and the centrifugal time is 30 min;
(C) oxidizing and stripping sewage: introducing the sewage treated in the step (B) into a stripping tower for stripping operation, introducing ozone into the stripping tower through a gas inlet pipe of the stripping tower to perform oxidation stripping on organic matters in the sewage, stopping the oxidation stripping operation when the COD (chemical oxygen demand) content of the sewage at the bottom of the stripping tower is lower than 5000mg/L, and finally enabling the residual gas to carry the organic matters to overflow from the top of the stripping tower and enter a tail gas absorption device which is an activated carbon adsorption tower;
(D) and biochemical treatment: carrying out three different biochemical treatments of anaerobic treatment, anoxic treatment and aerobic treatment on the sewage treated in the step (C);
(E) and deep treatment: and (E) carrying out advanced treatment on the sewage in the step (E), wherein the advanced treatment is a Fenton oxidation technology, and the treatment time is 1 h.
Preferably, the flocculating agent in the step (A) is one or more of polyaluminium chloride, polyferric chloride and polyferric sulfate.
Preferably, the adding amount of the flocculating agent in the step (A) is controlled to be 2.0 percent of the volume of the wastewater; the flocculant is a solution with the solid accounting for 0.1 percent of the solvent.
Example 2, a quinacridone production wastewater treatment method, includes the following steps:
(A) and materialization treatment: firstly, introducing sewage into a physicochemical treatment device, then adding a flocculating agent for flocculation reaction for 2.5h, and continuously stirring the sewage in the device after adding the flocculating agent;
(B) and recovering the solvent in the sewage: introducing the sewage treated in the step (A) into an evaporation tower through a water pump for distillation, wherein the distillation temperature is 75 ℃, introducing evaporated gas into a condensation recovery device for condensation recovery, and stopping evaporation when the concentration of the condensed recovery is lower than 93%; simultaneously, flocculate in the physicochemical treatment device is led into a horizontal centrifuge for centrifugal operation, and the centrifugal time is 40 min;
(C) oxidizing and stripping sewage: introducing the sewage treated in the step (B) into a stripping tower for stripping operation, introducing ozone into the stripping tower through a gas inlet pipe of the stripping tower to perform oxidation stripping on organic matters in the sewage, stopping the oxidation stripping operation when the COD (chemical oxygen demand) content of the sewage at the bottom of the tower is lower than 4500mg/L, and finally enabling the residual gas carrying the organic matters to overflow from the top of the tower to enter a tail gas absorption device;
(D) and biochemical treatment: carrying out three different biochemical treatments of anaerobic treatment, anoxic treatment and aerobic treatment on the sewage treated in the step (C);
(E) and deep treatment: performing advanced treatment on the sewage in the step (E), wherein the advanced treatment is one or more of an activated carbon technology, a Fenton oxidation technology and an ozone technology; the time for the advanced treatment is 1.5 h.
Preferably, the flocculating agent in the step (A) is one or more of polyaluminium chloride, polyferric chloride and polyferric sulfate.
Preferably, the adding amount of the flocculating agent in the step (A) is controlled to be 4.0 percent of the volume of the wastewater; the flocculant is a solution with the solid accounting for 0.3 percent of the solvent.
Example 3, a quinacridone production wastewater treatment method, includes the following steps:
(A) and materialization treatment: firstly, introducing sewage into a physicochemical treatment device, then adding a flocculating agent for flocculation, wherein the flocculation reaction time is 3 hours, and continuously stirring the sewage in the device after adding the flocculating agent;
(B) and recovering the solvent in the sewage: introducing the sewage treated in the step (A) into an evaporation tower through a water pump for distillation, wherein the distillation temperature is 80 ℃, introducing evaporated gas into a condensation recovery device for condensation recovery, and stopping evaporation when the concentration of the condensed recovery is lower than 95%; simultaneously, flocculate in the physicochemical treatment device is led into a horizontal centrifuge for centrifugal operation, and the centrifugal time is 50 min;
(C) oxidizing and stripping sewage: introducing the sewage treated in the step (B) into a stripping tower for stripping operation, introducing ozone into the stripping tower through a gas inlet pipe of the stripping tower to perform oxidation stripping on organic matters in the sewage, stopping the oxidation stripping operation when the COD (chemical oxygen demand) content of the sewage at the bottom of the tower is lower than 4800mg/L, and finally enabling the residual gas carrying the organic matters to overflow from the top of the tower and enter a tail gas absorption device;
(D) and biochemical treatment: carrying out three different biochemical treatments of anaerobic treatment, anoxic treatment and aerobic treatment on the sewage treated in the step (C);
(E) and deep treatment: performing advanced treatment on the sewage in the step (E), wherein the advanced treatment is one or more of an activated carbon technology, a Fenton oxidation technology and an ozone technology; the time for the deep treatment was 2 h.
Preferably, the flocculating agent in the step (A) is one or more of polyaluminium chloride, polyferric chloride and polyferric sulfate.
Preferably, the adding amount of the flocculating agent in the step (A) is controlled to be 8.0 percent of the volume of the wastewater; the flocculant is a solution with the solid accounting for 0.5 percent of the solvent.
As shown in the above table, the method for treating quinacridone production wastewater according to the embodiment can effectively reduce the COD of wastewater, greatly reduce the content of refractory organics such as sodium m-nitrobenzenesulfonate, and the recovery rate of ethanol in wastewater is higher than 95%, so that the quinacridone production wastewater reaches the standard of direct discharge.
As shown in fig. 1-3, the wastewater treatment system adopted in the quinacridone production wastewater treatment method in the above embodiment comprises a materialization device 1, a recovery device 2, an oxidation stripping device 3, a biochemical treatment device 4 and a deep treatment device 5, wherein the materialization device 1 has a front end connected with the production wastewater drainage water and a rear end connected with the recovery device 2, a water outlet of the recovery device 2 is connected with the oxidation stripping device 3, a front end of the biochemical treatment device 4 is connected with a water outlet of the oxidation stripping device 3, and a rear end is connected with an inlet of the deep treatment device 5; the left end of the materialization device 1 is provided with a water inlet 11, the right end of the materialization device 1 is provided with a water outlet 12, the water outlet 12 is provided with a filter screen 121, the filter screen can intercept flocculate and prevent the flocculate from entering the evaporation tower to influence the effective proceeding of evaporation, a stirring shaft 13 is arranged in the materialization device 1, stirring teeth 14 are arranged on the stirring shaft 13, a scraper 131 matched with the filter screen 121 is arranged on the stirring shaft 13, the scraper 131 can scrape the filter screen 121 when the scraper 131 grabs the filter screen 121 in the rotating process when the scraper 131 rotates along with the stirring shaft 13, the permeability of the filter screen is ensured, the stirring shaft 13 is connected with the top wall of the materialization device 1 through a bearing, the end part of the stirring shaft 13 is connected with a driving device 15, the driving device is a belt pulley group, the end part of the stirring, the motor is connected with a power supply through a switch; a flocculating agent dissolving device 6 is arranged on the materialization device 1, the flocculating agent dissolving device 6 is connected with the materialization device 1 through a pipeline, and a valve is arranged on the pipeline; the recovery device 2 comprises an evaporation tower 21 and a condensing device 22; a flocculate discharge port 16 is arranged at the bottom of the materialization device 1; adopt stirring tooth and (mixing) shaft can promote the flocculating agent of input in the materialization device and quick and water misce bene to because need follow the delivery port in with the sewage suction after flocculating to the evaporating tower, consequently adopt stirring tooth and (mixing) shaft can avoid letting the material after the flocculation to settle and stop up the delivery port, be provided with filter screen matched with scraper blade with filter screen matched with department simultaneously, can strike off the flocculation material that glues on the filter screen in the filtering process, guarantee the permeability of filter screen.
Preferably, an air outlet at the top of the evaporation tower 21 is connected with a condensing device 22, the condensing device 22 is a shell-and-tube heat exchanger, circulating water is used as a cooling medium, and a condensed water outlet of the condensing device 22 is connected with a recovery device 23; the ethanol vapor evaporated can be rapidly condensed by the circulating shell-and-tube heat exchanger.
Preferably, 6 middle parts of flocculating agent dissolving device are provided with puddler 61, be provided with branch on the puddler 61, be provided with water inlet 63 on the lateral wall of hopper 62 the right on the lateral wall of flocculating agent dissolving device 6 the left side, puddler 61 tip is connected with driving motor 65, driving motor 65 passes through switch and power electric connection, puddler 61 top is connected with flocculating agent dissolving device 6's inner wall through the bearing, be provided with heat exchange coil 66 on 6 inner walls of flocculating agent dissolving device, the stirring effect that can utilize the puddler when configuration flocculating agent solution at inside being provided with of flocculating agent dissolving device promotes the dissolving of flocculating agent to it can heat the internal solution of jar to be provided with heating coil, promotes dissolving of flocculating agent.
Preferably, a steam heating pipe 211 is arranged in the middle of the evaporation tower 21, and the heat exchange coil 66 is connected with the steam heating pipe 211 through a pipeline; the inside of the flocculant dissolving device is heated by utilizing the steam heated by the steam heating pipe in the evaporation tower, so that the temperature in the flocculant dissolving device can not be too high, and the temperature in the flocculant dissolving device is ensured to be within a reasonable range.
Preferably, the oxidation stripping device 3 comprises a stripping tower 31, and an air inlet of the stripping tower 31 is connected with an air pump 33 through an ozone generator 32; a gas outlet at the top of the stripping tower 31 is connected with a tail gas adsorption device 34; an ozone generator is arranged between an air inlet of the stripping tower and an air pump, and can simultaneously carry out two operations of stripping and oxidizing on the solution in the stripping tower.
Preferably, the biochemical treatment device 4 comprises an anaerobic treatment tank 41, an anoxic treatment tank 42 and an aerobic treatment tank 43, and the anaerobic treatment tank 41, the anoxic treatment tank 42 and the aerobic treatment tank 43 are connected through pipelines.
Preferably, the advanced treatment device 5 is a fenton oxidation device.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts of the present invention. The foregoing is only a preferred embodiment of the present invention, and it should be noted that there are objectively infinite specific structures due to the limited character expressions, and it will be apparent to those skilled in the art that a plurality of modifications, decorations or changes may be made without departing from the principle of the present invention, and the technical features described above may be combined in a suitable manner; such modifications, variations, combinations, or adaptations of the invention using its spirit and scope, as defined by the claims, may be directed to other uses and embodiments.

Claims (10)

1. A quinacridone production wastewater treatment method is characterized by comprising the following steps:
(A) and materialization treatment: firstly, introducing sewage into a physicochemical treatment device, then adding a flocculating agent for flocculation reaction for 2-3h, and continuously stirring the sewage in the device after adding the flocculating agent;
(B) and recovering the solvent in the sewage: introducing the sewage treated in the step (A) into an evaporation tower through a water pump for distillation, wherein the distillation temperature is 70-80 ℃, introducing the evaporated gas into a condensation recovery device for condensation recovery, and stopping evaporation when the concentration of the condensed gas is lower than 90%; simultaneously, flocculate in the physicochemical treatment device is led into a horizontal centrifuge for centrifugal operation, and the centrifugal time is 30-50 min.
(C) Oxidizing and stripping sewage: introducing the sewage treated in the step (B) into a stripping tower for stripping operation, specifically introducing ozone into the stripping tower through a gas inlet pipe of the stripping tower to perform oxidation stripping on organic matters in the sewage, stopping the oxidation stripping operation when the COD (chemical oxygen demand) content of the sewage at the bottom of the tower is lower than 5000mg/L, and finally enabling the residual gas carrying the organic matters to overflow from the top of the tower and enter a tail gas absorption device;
(D) and biochemical treatment: carrying out three different biochemical treatments of anaerobic treatment, anoxic treatment and aerobic treatment on the sewage treated in the step (C);
(E) and deep treatment: performing advanced treatment on the sewage in the step (E), wherein the advanced treatment is one or more of an activated carbon technology, a Fenton oxidation technology and an ozone technology; the deep treatment time is 1-2 h.
2. The quinacridone production wastewater treatment method according to claim 1, characterized in that, in step (A), the flocculating agent is one or more of polyaluminium chloride, polyferric chloride and polyferric sulfate.
3. The quinacridone production wastewater treatment method according to claim 1, characterized in that, in step (D), anaerobic, anoxic and aerobic treatment is performed.
4. A quinacridone production wastewater treatment system comprises a materialization device (1), a recovery device (2), an oxidation stripping device (3), a biochemical treatment device (4) and a deep treatment device (5), and is characterized in that one end of the materialization device (1) is connected with production wastewater drainage and the other end is connected with the recovery device (2), a drainage outlet of the recovery device (2) is connected with the oxidation stripping device (3), one end of the biochemical treatment device (4) is connected with a drainage outlet of the oxidation stripping device (3), and the other end is connected with a water inlet of the deep treatment device (5); a water inlet (11) is formed in one end of the materialization device (1), a water outlet (12) is formed in the other end of the materialization device (1), a filter screen (121) is arranged on the water outlet (12), a stirring shaft (13) is arranged inside the materialization device (1), stirring teeth (14) are arranged on the stirring shaft (13), a scraper (131) matched with the filter screen (121) in position is arranged on the stirring shaft (13), the stirring shaft (13) is connected with the materialization device (1) through a bearing, and the end part of the stirring shaft (13) is connected with a driving device (15); a flocculant dissolving device (6) is arranged on the materialization device (1); the recovery device (2) comprises an evaporation tower (21) and a condensation device (22); the bottom of the materialization device (1) is provided with a flocculate discharge port (16).
5. Quinacridone production wastewater treatment system according to claim 4, characterized in that, the outlet at the top of the evaporation tower (21) is connected to a condensing unit (22), the condensing unit (22) is a shell-and-tube heat exchanger, and the condensed water outlet of the condensing unit (22) is connected to a recycling unit (23).
6. Quinacridone production wastewater treatment system according to claim 4, characterized in that a stirring rod (61) is disposed in the middle of the flocculant dissolving device (6), a material hopper (62) and a water inlet (63) are disposed on the sidewall of the flocculant dissolving device (6), the end of the stirring rod (61) is connected to a driving motor (65), the top of the stirring rod (61) is connected to the flocculant dissolving device (6) through a bearing, and a heat exchange coil (66) is disposed on the inner wall of the flocculant dissolving device (6).
7. Quinacridone production wastewater treatment system according to claim 6, characterized in that, steam heating pipe (211) is installed in the middle of said evaporation tower (21), and said heat exchange coil (66) is connected to steam heating pipe (211) through a pipe.
8. Quinacridone production wastewater treatment system according to claim 4, characterized in that, the oxidation stripping apparatus (3) comprises a stripping column (31), the inlet of the stripping column (31) is connected to an air pump (33) through an ozone generator (32); and a gas outlet at the top of the stripping tower (31) is connected with a tail gas adsorption device (34).
9. Quinacridone production wastewater treatment system according to claim 4, characterized in that, the biochemical treatment device (4) comprises an anaerobic treatment tank (41), an anoxic treatment tank (42) and an aerobic treatment tank (43), the anaerobic treatment tank (41), the anoxic treatment tank (42) and the aerobic treatment tank (43) are connected by pipes.
10. Quinacridone production wastewater treatment system according to claim 4, characterized in that, the advanced treatment unit (5) is a Fenton oxidation plant.
CN202010053584.4A 2020-01-17 2020-01-17 Method and system for treating quinacridone production wastewater Pending CN111115977A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112062412A (en) * 2020-09-14 2020-12-11 怀化恒一颜料化学有限公司 Treatment method of quinacridone production wastewater

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112062412A (en) * 2020-09-14 2020-12-11 怀化恒一颜料化学有限公司 Treatment method of quinacridone production wastewater

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