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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 treatment and affect the long-term stable operation of the reactor.
However, the method of controlling the operation technology requires high process operation control and is difficult to achieve.

Method used

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  • Method of sewage oxidation treatment using supercritical water

Examples

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Effect test

Embodiment 1

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

Embodiment 2

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

Embodiment 3

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

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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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