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System and method for processing alkaline residue wastewater by utilizing supercritical water oxidation method

A technology for supercritical water oxidation and alkali slag wastewater, applied in the direction of oxidized water/sewage treatment, etc., can solve the problems of high cost and complex structure of wastewater treatment system, and achieve the effect of reducing cost and simple treatment system and process

Inactive Publication Date: 2011-03-30
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The structure of the wastewater treatment system is complex and the cost is high

Method used

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  • System and method for processing alkaline residue wastewater by utilizing supercritical water oxidation method
  • System and method for processing alkaline residue wastewater by utilizing supercritical water oxidation method
  • System and method for processing alkaline residue wastewater by utilizing supercritical water oxidation method

Examples

Experimental program
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Effect test

Embodiment 1

[0033] like figure 1 As shown, the system for treating alkali slag wastewater by supercritical water oxidation method includes a high-pressure wastewater plunger pump 1, an oxidant pump 2, a wastewater heat exchanger 3, an oxidant heat exchanger 4, a wastewater preheater 5, and an oxidant preheater 6 , a first condenser 7, gas-liquid separators 8A and 8B, a second condenser 9, a supercritical reactor 10, a high-pressure hydrocyclone 11, a waste water storage tank A, and an oxidant storage tank B.

[0034] A method for treating alkali slag wastewater by supercritical water partial oxidation, comprising the following steps:

[0035] (1) Use the high-pressure waste water plunger pump 1 to inject the alkali slag waste water into the supercritical reactor 10 through the waste water heat exchanger 3 and the waste water preheater 5;

[0036] (2) After part of the alkaline slag wastewater enters the supercritical reactor 10, close the high-pressure wastewater plunger pump 1 and the o...

Embodiment 2

[0045] Such as figure 1 As shown, the difference between this example and Example 1 is that the oxidant participating in the reaction is liquid oxygen, comprising the following steps:

[0046] (1) Use the high-pressure waste water plunger pump 1 to inject the alkali slag waste water into the supercritical reactor 10 through the waste water heat exchanger 3 and the waste water preheater 5;

[0047] (2) After part of the alkaline slag wastewater enters the supercritical reactor 10, close the high-pressure wastewater plunger pump 1 and the outlet valve of the supercritical reactor 10, start the heater 10 in the supercritical reactor, and inject the alkaline slag into it The waste water is statically heated to 400~600 ℃;

[0048] (3) Start the waste water preheater 5 and the oxidant preheater 6, and set the preheating temperature at 300~350°C;

[0049] (4) Start the high-pressure waste water plunger pump 1, and continue to inject alkali slag waste water into the supercritical re...

Embodiment 3

[0056] Such as figure 1 Shown, what this example differs from Example 1 is that the oxidizing agent participating in the reaction is a potassium permanganate solution, comprising the following steps:

[0057] (1) Use the high-pressure waste water plunger pump 1 to inject the alkali slag waste water into the supercritical reactor 10 through the waste water heat exchanger 3 and the waste water preheater 5;

[0058] (2) After part of the alkaline slag wastewater enters the supercritical reactor 10, close the high-pressure wastewater plunger pump 1 and the outlet valve of the supercritical reactor 10, start the heater 10 in the supercritical reactor, and inject the alkaline slag into it The waste water is statically heated to 400~600 ℃;

[0059] (3) Start the waste water preheater 5 and the oxidant preheater 6, and set the preheating temperature at 300~350°C;

[0060] (4) Start the high-pressure waste water plunger pump 1, and continue to inject alkali slag waste water into the ...

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Abstract

The invention relates to a system and method for processing alkaline residue wastewater by utilizing a supercritical water oxidation method. The system for processing the alkaline residue wastewater by utilizing the supercritical water oxidation method comprises a wastewater high-pressure plunger pump, a wastewater preheater, a supercritical reactor, an oxidizer high-pressure plunger pump, an oxidizer preheater and an oxidizer pressure pump, wherein the wastewater high-pressure plunger pump, the wastewater preheater and the supercritical reactor are sequentially connected through delivery pipelines; and the oxidizer pressure pump is connected with the supercritical reactor through the oxidizer preheater. The system is characterized in that the supercritical reactor is a high-pressure reactor, and a heater is arranged in the supercritical reactor.

Description

technical field [0001] The invention relates to a wastewater treatment method, more specifically to a system and method for treating alkali slag wastewater by using supercritical water oxidation technology. Background technique [0002] Alkali slag in refineries and chemical plants mainly comes from the initial constant top oil produced by atmospheric pressure and catalytic production, catalytic gasoline, catalytic diesel and other oil products, and the waste liquid after alkali washing with lye. The characteristics of refining soda slag are: high organic content, which contains a large amount of organic sulfides such as sulfide and thiophene, which are the source of the refinery's atmospheric odor; high COD content, and the COD of catalytic gasoline and diesel soda slag can reach hundreds of thousands; free NaOH High content, many sodium salts of organic acids; poor biochemical treatment. These characteristics have also become the key factors affecting the refinery's s...

Claims

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Application Information

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IPC IPC(8): C02F1/72
Inventor 廖传华朱跃钊王重庆朱廷风方向马雷武一鸣
Owner NANJING UNIV OF TECH
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