System and method for treating organic wastewater with high volatility by supercritical water oxidation

A supercritical water oxidation and high volatility technology, applied in the energy and environment fields, can solve problems such as corrosion and salt deposition, and achieve the effect of reducing energy consumption, ensuring stability, and reducing system operating costs

Active Publication Date: 2015-12-09
GUANGZHOU INST OF ADVANCED TECH CHINESE ACAD OF SCI +1
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Problems solved by technology

The invention solves the problems of corrosion and salt deposition in the process of treating salt-containing highly volatile organic wastewate

Method used

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  • System and method for treating organic wastewater with high volatility by supercritical water oxidation

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Embodiment Construction

[0043] The present invention will be further described below in conjunction with accompanying drawing:

[0044] Highly volatile organic wastewater, that is, waste water, enters the second heat exchanger 1 through the inlet channel 1-1 for preheating, and then enters the low-temperature multiple-effect distiller 2 through the inlet channel 2-1 for negative-pressure multi-effect evaporation. The outlet channel 2-6 is an air extraction port, which is connected to the ejector 27 to extract the non-condensable gas inside the low-temperature multiple-effect still 2 to realize the negative pressure condition of the low-temperature multiple-effect still 2 . The concentrated saline waste liquid produced by the low-temperature multi-effect evaporation of waste water is discharged from the outlet channel 2-4, and the high-concentration organic liquid flows out from the outlet channel 2-5; the cooling water is injected into the low-temperature multi-effect distiller 2 from the inlet channe...

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Abstract

The invention relates to the technical fields of energies and environments, and particularly discloses a system and a method for treating organic wastewater with high volatility by supercritical water oxidation. Concentrated saliferous wastewater and organic liquid with high concentration are produced by low temperature multi-effect distillation, scale formation of inorganic salt is avoided in a concentration process, the organic liquid with high concentration can be injected into a transpiring water reactor at low temperature, even at normal temperature, the stability of the supercritical water oxidation is guaranteed, and the blocking problem of wastewater in a preheating section can be avoided; the concentrated saliferous wastewater is subjected to ultrafiltration and reverse osmosis to produce fresh water, the fresh water is injected into the transpiring water reactor as evaporable water so as to protect the reactor, and the operation cost of the system is reduced. The reaction fluid is subjected to thermal energy recovery and is reduced to normal temperature, and then the pressure of high-pressure fluid can used as a power source of a pressure energy recovery device and an ejector, preparation of fresh water through desalting of concentrated solution and condition of negative pressure of a low temperature multi-effect distillation apparatus can be realized, and energy consumption in the step can be greatly lowered.

Description

technical field [0001] The invention relates to the technical field of energy and environment, in particular to a system and method for supercritical water oxidation treatment of highly volatile organic wastewater. Background technique [0002] The treatment of high-concentration (chemical oxygen demand COD>2000mg / L), toxic and refractory organic wastewater is a recognized problem at home and abroad. Traditional organic wastewater treatment technologies (such as physical and chemical treatment technology, biological treatment technology, wet oxidation, incineration, etc.) have problems such as high cost, low degradation rate, and easy secondary pollution. Supercritical Water Oxidation (SCWO), as a new technology for treating organic wastewater and recovering energy, is one of the effective methods to solve this problem. [0003] Supercritical water oxidation is a method of "combustion" oxidation of organic matter with air or other oxidants under high temperature and high...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F101/30
CPCY02A20/131
Inventor 张凤鸣岳鹏飞冯东东陈顺权
Owner GUANGZHOU INST OF ADVANCED TECH CHINESE ACAD OF SCI
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