Method of sewage oxidation treatment using supercritical water

A technology for supercritical water oxidation and waste water treatment, which is applied in the direction of oxidized water/sewage treatment, water/sewage treatment, chemical instruments and methods, etc. It can solve the problems of high process operation control requirements, affecting the stable operation of the reactor, and reactor structure design. Complexity and other issues, to achieve the effect of simple process

Active Publication Date: 2006-02-08
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

Although the above technical design is novel and has its unique advantages, the complexity of the structural design of the reactor will inevitably increase the cost of wastewater treatmen

Method used

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  • Method of sewage oxidation treatment using supercritical water

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Example Embodiment

[0032] Example 1

[0033] The untreated coking wastewater was subjected to supercritical water oxidation treatment. The properties of the wastewater used are shown in Table 1. The raw water of coking wastewater is pressurized to 25 MPa by the high-pressure metering pump 1, passes through the heat exchanger 3, the temperature is 350°C after preheating, and then enters the salt separator 4 at a temperature of 600°C. The ozone is pressurized to 25 MPa by the high-pressure metering pump 2 at an oxidizing dose of about 6 times the theoretical oxygen demand, and then heat exchanged by the heat exchanger 3, and then further heated to 580°C by the heater 6. Then, it is mixed with the wastewater at the inlet of the reactor 7 at a mixing temperature of 594°C, and then flows through the reactor 7. The fluid residence time in the reactor 7 is 13.4 seconds, and the outlet temperature of the reactor 7 is 610°C. The reactor 7 supplements the heat lost when the fluid flows through the reactor 7 t...

Example Embodiment

[0034] Example 2

[0035] The untreated coking wastewater was subjected to supercritical water oxidation treatment, and the quality of the wastewater used was the same as in Example 1. The raw coking wastewater is pressurized to 23 MPa by the reciprocating pump 1, and passes through the heat exchanger 3 at a certain flow rate. After preheating, the temperature is 360°C, and then enters the salt separator 4 at a temperature of 580°C. After the hydrogen peroxide is diluted, it is pressurized to 23 MPa by the high-pressure metering pump 2 at an oxidizing dose of about 4 times the theoretical oxygen demand, then heat exchange by the heat exchanger 3, and then further heated to 590°C by the heater 6. Then, it is mixed with the wastewater at the inlet of the reactor 7 at a mixing temperature of 584°C, and then flows through the reactor 7. The fluid residence time in the reactor 7 is 13.6s, and the outlet temperature of the reactor 7 is 590°C. The rest is the same as in Example 1. The ef...

Example Embodiment

[0036] Example 3

[0037]The untreated coking wastewater was subjected to supercritical water oxidation treatment, and the quality of the wastewater used was the same as in Example 1. The raw coking wastewater is pressurized to 26 MPa by the reciprocating pump 1, and passes through the heat exchanger 3 at a certain flow rate. After preheating, the temperature is 370°C, and then enters the salt separator 4 at a temperature of 590°C. After the hydrogen peroxide is diluted, it is pressurized to 26 MPa by the high-pressure metering pump 2 with an oxidizing dose of about 4 times the theoretical oxygen demand, then heat exchange by the heat exchanger 3, and then further heated to 610°C by the heater 6. Then, it is mixed with the wastewater at the inlet of the reactor 7 at a mixing temperature of 604°C, and then flows through the reactor 7. The fluid residence time in the reactor 7 is 18.3 s, and the outlet temperature of the reactor 7 is 600°C. The rest is the same as in Example 1. The ...

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Abstract

The invention discloses a process for oxidation treatment of waste-water through hypercritical water which comprises, pressurizing the waste water to 22.1-30 MPa, preheating to 300-370 deg. C, loading the waste-water to a demineralizing equipment, elevating temperature to 450-650 deg C for desalinization, pressurizing the fluid containing oxidizing agent to 22.1-30 MPa, elevating the temperature to 550-650 deg. C, mixing the oxygen-containing fluid with desalinized waste-water and loading into hypercritical reactor, controlling the temperature between 550-650 deg. C, pressure between 22.1-30.0MPa, holding for 10-40 seconds, and carrying out hypercritical oxidation reaction.

Description

technical field [0001] The invention belongs to a method for treating waste water, in particular to a method for treating waste water containing chemical oxygen demand (COD), ammoniacal nitrogen (NH 3 -N), thiocyanide, volatile phenol and one or more components in aromatic hydrocarbons and industrial wastewater containing inorganic salts. Background technique [0002] At present, the highly polluting wastewater produced by industries such as iron and steel, oil refining, chemical fertilizer, papermaking, and printing and dyeing generally adopts multi-stage treatment technology dominated by biological methods. Indicators are processed step by step. The process is complicated, and the treatment effect on ammoniacal nitrogen, COD, chroma and other indicators is poor. The treatment of wastewater containing inorganic salts also requires advanced treatment steps such as membrane filtration or electrodialysis to achieve the purpose of reuse. Supercritical water oxidation technolo...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/72C02F1/58
Inventor 毕继诚陈瑞勇张荣林芸
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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