Organic acid-containing production wastewater treatment device

Abstract

The utility model provides a device for treating production wastewater containing organic acid. The device mainly comprises a raw material wastewater tank, a wastewater feeding pump, a wastewater heat exchanger, a wastewater electric heater, a wastewater reactor, a wastewater cooler, an air compressor, a gas-liquid separation tank, a tail gas adsorber, a regulating valve and the like. The device disclosed by the utility model can be used for effectively treating production wastewater which is high in organic matter concentration content, strong in acidity, strong in toxicity, poor in biodegradability and difficult to biodegrade.

Description

Technical Field

[0001] The utility model relates to the technical fields of petrochemical industry and environmental protection, in particular to a wastewater treatment device containing organic acid. Background Art

[0002] At present, the production wastewater generated in the production process of catalyst or petrochemical enterprises has complex composition, contains a large amount of organic pollutants, high COD concentration, high organic acid content, and most of them contain organic matter that is toxic to microorganisms. It has many biodegradable substances, low B / C ratio, poor biodegradability, and is difficult to directly biochemically treat. It is a key difficulty in wastewater treatment, and it is difficult to meet the treatment requirements using general treatment methods. Utility Model Content

[0003] The purpose of the utility model is to propose a treatment device with simple process and low production cost to meet the emission indicators of sewage treatment plants, aiming at the problems that the production wastewater generated in the production process of catalysts or petrochemical enterprises is complex in composition, contains a large amount of organic pollutants, has high COD concentration, high organic acid content, and mostly contains organic matter that is toxic to microorganisms, many biodegradable substances, low B / C ratio, and poor biodegradability.

[0004] A production wastewater treatment device containing organic acid consists of a raw wastewater tank, a wastewater feed pump, a wastewater heat exchanger, a wastewater electric heater, a wastewater reactor, a wastewater cooler, an air compressor, a gas-liquid separation tank, a tail gas adsorber and a control system.

[0005] The raw wastewater tank, the wastewater feed pump, the wastewater heat exchanger, and the wastewater electric heater are connected in sequence through a first pipeline, and the wastewater electric heater is connected to the feed port of the wastewater reactor;

[0006] The air compressor is connected to the wastewater reactor through a second pipeline;

[0007] The outlet of the wastewater reactor is connected to the wastewater heat exchanger, and the outlet of the wastewater heat exchanger is connected to the wastewater cooler and the gas-liquid separator in sequence through a third pipeline.

[0008] A pressure control valve is installed on the wastewater cooler.

[0009] The control system consists of a regulating valve, a pressure transmitter and a liquid level transmitter.

[0010] The air compressor adopts a variable frequency motor.

[0011] The wastewater heat exchanger is a shell and tube heat exchanger.

[0012] The wastewater reactor is made of 16MnIV and the inner surface is butt-welded with NS3304.

[0013] An air distributor and a liquid distributor are arranged inside the wastewater reactor.

[0014] The tail gas adsorber is filled with activated carbon.

[0015] The wastewater reactor has a pressure of 8.0-9.0 MPaG and a temperature of 250-300°C.

[0016] The organic acid content of the raw material is 50000-80000 mg / L, and the gas-liquid volume ratio of the wastewater reaction is 2-4.

[0017] The organic acid content of qualified wastewater from the gas-liquid separation tank can be reduced to below 5000 mg / L.

[0018] The main advantages and beneficial effects of the utility model are:

[0019] 1. The process is simple, the device occupies a small area, and can be provided as a skid-mounted device.

[0020] 2. Utilize thermal coupling technology to fully utilize the heat of the production process, with low energy consumption and low operating costs. No additives are required and no secondary pollution is generated.

[0021] 3. It has a wide range of applications and strong adaptability, and is suitable for various organic wastewaters generated in the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of a device for treating production wastewater containing organic acids.

[0023] In the figure: 1—raw material wastewater tank, 2—wastewater feed pump, 3—wastewater heat exchanger, 4—wastewater electric heater, 5—wastewater reactor, 6—air compressor, 7—wastewater cooler, 8—regulating valve, 9—gas-liquid separation tank, 10—tail gas adsorber, 100—first pipeline, 200—second pipeline, 300—third pipeline. DETAILED DESCRIPTION

[0024] In order to clearly illustrate the technical features of the present device, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited thereto.

[0025] Example:

[0026] The production wastewater generated during the production process of a certain enterprise has a COD of 60,000 mg / L, a TOC of 25,000 mg / L, a pH value of 1-2, and an organic acid content of 55,000 mg / L. The wastewater is stored in barrels in a warehouse and cannot be directly treated biochemically.

[0027] The raw wastewater is pumped from the raw wastewater tank 1 through the wastewater feed pump 2 with a flow rate of 150L / h and a metering pump to increase the pressure to 9.0MPaG. It is connected to the wastewater heat exchanger 3 through the first pipeline 100, exchanges heat with the high-temperature product after the reaction, and is heated to 270°C by the wastewater electric heater 4, and finally enters the bottom of the wastewater reactor 5.

[0028] The air required for the reaction is compressed to 9.0 MPaG by the air compressor 6 and then enters the wastewater reactor 5, where it is fully mixed and reacted with the wastewater.

[0029] In the wastewater reactor 5, wastewater, air and catalyst are fully mixed, and organic matter in the water is oxidized and decomposed into water and carbon dioxide, while releasing heat. The oxidized liquid after the reaction is discharged from the upper discharge port of the reactor together with the remaining air, and heat is exchanged with the raw wastewater through the wastewater heat exchanger 3. After fully utilizing the residual heat, the temperature is reduced to 40°C through the wastewater cooler 7, and then enters the gas-liquid separation tank 9 for two-phase separation. The separated tail gas passes through the tail gas adsorber to adsorb the organic gas that may exist in the cracking process, and is discharged at a high point after adsorption; the COD concentration of the separated qualified wastewater can be reduced to below 5000 mg / L, and it is directly discharged to the sewage treatment plant.

Claims

1. A production wastewater treatment device containing organic acid, mainly comprising a raw wastewater tank, a wastewater feed pump, a wastewater heat exchanger, a wastewater electric heater, a wastewater reactor, a wastewater cooler, an air compressor, a gas-liquid separation tank, a tail gas adsorber and a control system, characterized in that: The raw wastewater tank, the wastewater feed pump, the wastewater heat exchanger, and the wastewater electric heater are connected in sequence through a first pipeline, and the wastewater electric heater is connected to the feed port of the wastewater reactor; The air compressor is connected to the wastewater reactor through a second pipeline; The outlet of the wastewater reactor is connected to the wastewater heat exchanger, and the outlet of the wastewater heat exchanger is connected to the wastewater cooler and the gas-liquid separator in sequence through a third pipeline.

2. The process wastewater treatment device containing organic acid according to claim 1, characterized in that The wastewater cooler is provided with a pressure control valve.

3. The process wastewater treatment device containing organic acid according to claim 1, characterized in that The wastewater feed pump adopts a plunger metering pump, and the number is 2.

4. The process wastewater treatment device containing organic acid according to claim 1, characterized in that The air compressor adopts a variable frequency motor.

5. The process wastewater treatment device containing organic acid according to claim 1, characterized in that The wastewater heat exchanger is a shell and tube heat exchanger.

6. The process wastewater treatment device containing organic acid according to claim 1, characterized in that The wastewater reactor is made of 16MnIV and the inner surface is butt-welded with NS3304.

7. The process wastewater treatment device containing organic acid according to claim 1, characterized in that An air distributor and a liquid distributor are arranged inside the wastewater reactor.

8. The process wastewater treatment device containing organic acid according to claim 1, characterized in that The control system consists of a regulating valve, a pressure transmitter and a liquid level transmitter.

9. The process wastewater treatment device containing organic acid according to claim 1, characterized in that The tail gas adsorber is filled with activated carbon.

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