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
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[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...
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[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...
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[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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