CN216191569U - Epoxy resin high salt waste water multi-stage treatment system - Google Patents

Abstract

The utility model relates to an epoxy resin high-salinity wastewater multi-stage treatment system which comprises a pretreatment salt water tank (1), a pretreatment separation tower (2), a primary chlorinolysis kettle (3), a primary oxidation kettle (4), a secondary oxidation kettle (5) and a neutralization reaction kettle (6) which are arranged in sequence; a first filter (7) is arranged between the pretreatment brine tank (1) and the pretreatment separation tower (2); and a second filter (8) is arranged between the primary oxidation kettle (4) and the secondary oxidation kettle (5). Compared with the prior art, the method can treat the epoxy resin high-salt high-TOC wastewater until the TOC is less than 10ppm, and the treated brine can be recycled as a raw material of other industries, such as chlor-alkali or electrolysis industries, so that the method saves the environmental protection cost and brings economic benefits.

Description

Epoxy resin high salt waste water multi-stage treatment system

Technical Field

The utility model relates to the technical field of water treatment, in particular to an epoxy resin high-salinity wastewater multi-stage treatment system.

Background

Epoxy resin production devices often produce large amounts of wastewater containing high concentrations of salts and organic matter, which meet environmental discharge standards and require a series of physicochemical treatments. Generally, about 1.5 tons of high-salt and high-organic wastewater is attached to the production of each ton of epoxy resin products, and a basic epoxy resin device with the yield of 5 ten thousand tons per year generates 15000 tons of solid waste salt one year, which is extremely unfavorable for environmental protection. The wastewater not only contains intermediate products with large molecular weight and aged resin, but also dissolves a large amount of sodium chloride salt and organic matters. The treatment method of treating organic matter alone to achieve the effect of reducing total organic carbon TOC in wastewater is not suitable for treating a large amount of organic matter in an environment with high salt content.

At present, the conventional treatment method of epoxy resin high-salt wastewater mainly adopts an evaporative crystallization technology, wherein solid sodium chloride salt is obtained after the wastewater is evaporated by a plurality of stages, and mother liquor remained after evaporation is continuously circulated back to an evaporation system. The solid salt obtained by the treatment method is attached with organic matters, and the content of the organic matters depends on the level of the multi-effect evaporation process. However, with the increasing attention of the national environmental protection, the new environmental protection policy of the ministry of environmental protection for fine chemical industry, coal chemical industry and pesticide industry is that the salt generated by the multi-effect evaporation of epoxy resin is regarded as industrial waste residue, the recycling value is limited, the channel for processing the salt by enterprises is increasingly obstructed, and the environmental protection cost is high.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a multistage treatment system for epoxy resin high-salt wastewater, which is used for the treatment process of epoxy resin high-salt high-TOC wastewater.

The purpose of the utility model can be realized by the following technical scheme: a multi-stage treatment system for epoxy resin high-salinity wastewater comprises a pretreatment salt water tank, a pretreatment separation tower, a primary chlorinolysis kettle, a primary oxidation kettle, a secondary oxidation kettle and a neutralization reaction kettle which are sequentially arranged;

a first filter is arranged between the pretreatment brine tank and the pretreatment separation tower;

and a second filter is arranged between the primary oxidation kettle and the secondary oxidation kettle.

Preferably, the top of the pretreatment separation tower is connected with a solvent tank, and the bottom of the pretreatment separation tower is connected with a primary chlorinolysis kettle.

Preferably, a first oxidation feeding pump is arranged between the primary chlorinolysis kettle and the primary oxidation kettle.

Preferably, an oxidation material transferring pump is arranged between the first-stage oxidation kettle and the second-stage oxidation kettle.

Preferably, the primary oxidation kettle and the secondary oxidation kettle are respectively and independently provided with a heating system and a cooling system.

Preferably, the primary oxidation kettle comprises a plurality of oxidation kettles which are connected in series.

Preferably, the system is provided with a plurality of temperature sensors, pressure sensors and concentration sensors.

Further preferably, the temperature sensor, the pressure sensor and the concentration sensor are connected with an alarm.

Preferably, a second oxidation feeding pump is arranged between the secondary oxidation kettle and the neutralization reaction kettle.

Further preferably, a third filter is arranged between the second oxidation feed pump and the neutralization reaction kettle.

Preferably, the outlet of the neutralization reaction kettle is connected with a brine tank, and an inlet pipeline and a tank body of the brine tank are both provided with TOC online detection components.

Further preferably, a fourth filter is arranged between the neutralization reaction kettle and the brine tank.

Compared with the prior art, the utility model has the following advantages:

1. according to the utility model, through the sequentially arranged pretreatment brine tank, pretreatment separation tower, primary chlorinolysis kettle, primary oxidation kettle, secondary oxidation kettle and neutralization reaction kettle, high-salinity wastewater can be firstly subjected to removal of suspended impurities such as aged resin, then the TOC in brine is reduced to below 100ppm through primary chlorinolysis, then the TOC content of brine is further reduced through primary oxidation and secondary oxidation, and the catalyst is neutralized and removed, so that the TOC of brine is finally reduced to below 10 ppm;

2. the method can treat the epoxy resin high-salt high-TOC wastewater until the TOC is less than 10ppm, and the treated brine can be recycled as a raw material of other industries, such as chlor-alkali or electrolysis industries, so that the environmental protection cost is saved, and the economic benefit is brought;

3. the utility model solves the problem of high-salinity wastewater treatment in the aspect of cost optimization, has wide application range, and can effectively oxidize various high-concentration organic wastewater, particularly the wastewater which has high toxicity and is difficult to degrade by the conventional method;

4. the method has the advantages of mild reaction, high treatment efficiency, high purification efficiency and no secondary pollution, the recovered salt meets the technical index of epoxy resin byproduct industrial sodium chloride (T/CPCIF 0068-;

5. the utility model adopts automatic control technology and monitoring technology, has convenient operation and safe and reliable operation, the system is provided with safety values of temperature, pressure and key pollution indexes, and when the safety value exceeds a safety range, the system sends out an alarm.

Drawings

FIG. 1 is a schematic structural diagram of a multistage treatment system for epoxy resin high-salt wastewater according to the present invention;

in the figure: 1-pretreatment salt water tank, 2-pretreatment separation tower, 3-primary chlorinolysis kettle, 4-primary oxidation kettle, 5-secondary oxidation kettle, 6-neutralization reaction kettle, 7-first filter, 8-second filter, 9-solvent tank, 10-first oxidation feed pump, 11-oxidation transfer pump, 12-second oxidation feed pump, 13-third filter, 14-salt water tank, and 15-fourth filter.

Detailed Description

The utility model is described in detail below with reference to the figures and specific embodiments. The following examples are carried out on the premise of the technical scheme of the utility model, and detailed embodiments and specific operation processes are given, but the scope of the utility model is not limited to the following examples.

Example 1

A multi-stage treatment system for epoxy resin high-salt wastewater is used for treating the high-salt wastewater generated by an epoxy resin device. About 3000mg/L of wastewater TOC, 1.5-2% of NaOH, about 22% of NaCl, 0.1-0.5% of aged resin and other suspended matters, and about 150ppm of toluene.

The structure of the epoxy resin high-salt wastewater multi-stage treatment system is shown in figure 1, and comprises a pretreatment salt water tank 1, a pretreatment separation tower 2, a primary chlorinolysis kettle 3, a primary oxidation kettle 4, a secondary oxidation kettle 5, a neutralization reaction kettle 6 and a salt water tank 14 which are sequentially connected through a pipeline, wherein a first filter 7 is arranged between the pretreatment salt water tank 1 and the pretreatment separation tower 2, a first oxidation feeding pump 10 is arranged between the primary chlorinolysis kettle 3 and the primary oxidation kettle 4, an oxidation transferring pump 11 and a second filter 8 are arranged between the primary oxidation kettle 4 and the secondary oxidation kettle 5, a second oxidation feeding pump 12 and a third filter 13 are arranged between the secondary oxidation kettle 5 and the neutralization reaction kettle 6, and a fourth filter 15 is arranged between the neutralization reaction kettle 6 and the salt water tank 14. Wherein, the top of the pretreatment separation tower 2 is connected with a solvent tank 9, the bottom of the tower is connected with a primary chlorinolysis kettle 3, and a primary oxidation kettle 4 comprises a plurality of oxidation kettles which are connected in series.

When the system of the embodiment is used for treating wastewater, high-salt wastewater generated by an epoxy resin device is conveyed to a pretreatment salt water tank 1 through a pump, the wastewater is kept standing for layering and then flows into a pretreatment separation tower 2 through a first filter 7 for liquid-liquid separation, a solvent at the top of the tower returns to a solvent tank 9, high-salt water at the bottom of the tower automatically flows into a primary chlorinolysis kettle 3, the high-salt wastewater after chlorinolysis is conveyed to a primary oxidation kettle 4 through a first oxidation feed pump 10, the wastewater is subjected to oxidation treatment of oxidation kettles connected in series in sequence and then is conveyed to a secondary oxidation kettle 5 through a second filter 8 through an oxidation transfer pump 11, each kettle is matched with an independent heating and cooling system, the high-salt wastewater and a medicament are mixed and reacted at the bottom of the secondary oxidation kettle 5, the treated wastewater is automatically discharged from the upper part of the secondary oxidation kettle 5 and conveyed to a neutralization reaction kettle 6 through a third filter 13 through a second oxidation feed pump 12, the neutralized salt water flows into a salt water tank 14 after being filtered by a fourth filter 15, the inlet pipeline and the tank body of the brine tank 14 are both provided with TOC online detection components, a multi-channel type is selected for real-time monitoring, after the outlet water reaches the standard, a brine pump on the brine tank 14 is started to discharge the outlet water, and the outlet water which does not reach the standard returns to different treatment procedures for retreatment according to the water quality condition.

Specifically, the high-salinity wastewater is effectively pretreated in a pretreatment brine tank to remove suspended impurities such as aged resin, and glycerin in the brine is decomposed into micromolecular inorganic substances through primary chlorinolysis in a primary chlorinolysis kettle 3. Depending on the specific pH of the feed brine, it may be necessary to add an appropriate amount of NaOH after primary chlorinolysis for pH adjustment of the brine, which after primary chlorinolysis has a TOC below 100 ppm. In the first-stage oxidation kettle 4, the oxidizing agent oxidizes the carbon-containing organic matters in the brine, the formed volatile organic matters can be washed away by spraying, then the brine is filtered by the second filter 8, and then the catalyst is added to carry out secondary oxidation in the second-stage oxidation kettle 5, so that the TOC of the brine is further reduced. The brine after the secondary oxidation is injected into the neutralization reaction kettle 6, the PH is adjusted to enable the catalyst to form a precipitate, and after the precipitate is filtered by a fourth filter 15, the TOC of the final brine can reach below 10 ppm.

In the present invention, it should be noted that the terms "first", "second", "third", and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.

Claims (10)

1. The multistage treatment system for the epoxy resin high-salinity wastewater is characterized by comprising a pretreatment salt water tank (1), a pretreatment separation tower (2), a primary chlorinolysis kettle (3), a primary oxidation kettle (4), a secondary oxidation kettle (5) and a neutralization reaction kettle (6) which are sequentially arranged;

a first filter (7) is arranged between the pretreatment brine tank (1) and the pretreatment separation tower (2);

and a second filter (8) is arranged between the primary oxidation kettle (4) and the secondary oxidation kettle (5).

2. The multistage treatment system for the epoxy resin high-salt wastewater as claimed in claim 1, wherein the top of the pretreatment separation tower (2) is connected with a solvent tank (9), and the bottom of the pretreatment separation tower is connected with a primary chlorinolysis kettle (3).

3. The multistage treatment system for the epoxy resin high-salt wastewater as claimed in claim 1, wherein a first oxidation feed pump (10) is arranged between the primary chlorinolysis kettle (3) and the primary oxidation kettle (4).

4. The multi-stage treatment system for the epoxy resin high-salt wastewater as claimed in claim 1, wherein an oxidation material transfer pump (11) is arranged between the primary oxidation kettle (4) and the secondary oxidation kettle (5).

5. The multi-stage treatment system for epoxy resin high-salt wastewater as claimed in claim 1, wherein the primary oxidation kettle (4) and the secondary oxidation kettle (5) are respectively and independently provided with a heating system and a cooling system.

6. The multi-stage epoxy resin high-salt wastewater treatment system as claimed in claim 1, wherein the system is provided with a plurality of temperature sensors, pressure sensors and concentration sensors.

7. The multi-stage treatment system for the epoxy resin high-salt wastewater as claimed in claim 1, wherein a second oxidation feed pump (12) is arranged between the secondary oxidation kettle (5) and the neutralization reaction kettle (6).

8. The multistage epoxy resin high-salt wastewater treatment system as claimed in claim 7, wherein a third filter (13) is arranged between the second oxidation feed pump (12) and the neutralization reaction kettle (6).

9. The epoxy resin high-salt wastewater multi-stage treatment system according to claim 1, wherein an outlet of the neutralization reaction kettle (6) is connected with a brine tank (14), and an inlet pipeline and a tank body of the brine tank (14) are respectively provided with a TOC online detection component.

10. The multi-stage treatment system for epoxy resin high-salt wastewater as claimed in claim 9, wherein a fourth filter (15) is arranged between the neutralization reaction kettle (6) and the brine tank (14).

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