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Wastewater treatment process and system

A wastewater treatment system and wastewater treatment technology, applied in the direction of water/sewage multi-stage treatment, oxidized water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of low energy utilization rate, achieve high energy efficiency, cost reduction effect

Active Publication Date: 2012-06-27
ENN ENVIROTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] In view of the problems existing in the related art, the object of the present invention is to provide a wastewater treatment process and a wastewater treatment system to solve the technical problem of low energy utilization in the prior art

Method used

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  • Wastewater treatment process and system
  • Wastewater treatment process and system
  • Wastewater treatment process and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] see image 3 , Dehydration treatment is carried out to waste water in membrane distillation unit 2, the temperature in membrane distillation unit 2 is controlled at 65-80 ℃, vacuum degree (the vacuum degree of the negative pressure chamber 21 of membrane distillation unit) 25-47.5Kpa, wherein. The waste water is concentrated 7 times after dehydration treatment, and the 7 times concentrated waste water is sent to the desalination device 5 by a high-pressure pump for desalination treatment. In the process of desalination treatment, the pressure of the wastewater is 22-25MPa, and the wastewater is heated to 360-380°C. At this time, more than 95% of the salt is precipitated from the water, and the salt is removed by the gravity sedimentation removal system. The desalted waste water enters the supercritical water reactor 1. In the supercritical water reactor 1, oxygen reacts with the organic matter in the waste water to form a post-reaction fluid (oxidation reactant gas) and...

Embodiment 2

[0045] The difference from Example 1 is that the oxidation product ejected from the jet vacuum pump 4 is directly introduced into the first heat exchanger 6 to heat the waste water to be supplied to the membrane distillation unit, and the oxidation product ejected from the jet vacuum pump 4 is not introduced into the membrane The negative pressure chamber 21 in the distillation device releases heat; the rest of the steps are the same as those in Example 1.

Embodiment 3

[0047] see Figure 4 , the waste water is pumped into the dehydration device for dehydration treatment. The dehydration device is a membrane distillation device 2, and the temperature in the membrane distillation device 2 is controlled at 80-95 ° C, and the vacuum degree is 47.5-84.5KPa (the vacuum degree of the negative pressure chamber of the membrane distillation device ). After dehydration treatment, the wastewater is concentrated 7 times, and the 7 times concentrated wastewater is pumped into the desalination device 5 for desalination treatment. During the desalination treatment, the pressure of the wastewater is maintained at 22-25MPa, and the wastewater is heated to 360-380°C. When most of the salt is precipitated from the water, the gravity sedimentation removes the system, and the rest of the material enters the supercritical water reactor 1. In the supercritical water reactor 1, oxygen reacts with the organic matter in the wastewater to form an oxidation reactant (re...

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Abstract

The invention provides a wastewater treatment process. The wastewater treatment process comprises the following steps of: a, allowing wastewater to enter a concentration treatment device and concentrating, and separating part of water from the wastewater in a steam form to obtain concentrated wastewater; b, performing supercritical water oxidation on the concentrated wastewater to form a reacted fluid; c, pressurizing part of or all the reacted fluid by using a pressure production device to obtain a decompressed fluid, and providing a pressure condition for concentration treatment by using pressure produced by the pressure production device. The invention also provides a wastewater treatment system for the wastewater treatment process. The system comprises a wastewater concentrating device, a supercritical water reactor, and the pressure production device; the concentrating device is also provided with a chamber which realizes dehydration and has relatively high pressure, and a chamber with relatively low pressure, and the chamber with relatively low pressure is communicated with a pressure cavity. The wastewater treatment process and the wastewater treatment are high energy utilization rate.

Description

technical field [0001] The invention relates to a wastewater treatment process and a wastewater treatment system. Background technique [0002] Most of the high-concentration refractory wastewater such as pharmaceutical factory wastewater and military industrial wastewater is toxic, and it is usually difficult to treat it with biological aerobic technology or anaerobic technology. Toxic substances will kill microorganisms. Therefore, traditionally, the method of dilution and concentration reduction is still used to dilute the COD of wastewater to the national discharge standard, which will essentially fail to treat the organic matter in wastewater. This will not only cause secondary pollution of the environment, but also waste a lot of water resources. Individual wastewater is treated by incineration oxidation or mixed combustion oxidation. Due to the high water content of wastewater, the energy consumption in the treatment process is greatly increased, and the heat is not ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/72
Inventor 程乐明宋庆峰张玉宝王青谷俊杰李成学杜娟田文堂宋成才高志远
Owner ENN ENVIROTECH CO LTD
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