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Micro-nano bubble generating device and method and application thereof in dye wastewater treatment

A technology for micro-nano bubbles and wastewater treatment, applied in the direction of oxidized water/sewage treatment, special compound water treatment, water/sludge/sewage treatment, etc. Oxidation costs are high, achieving good application value, less foam, and less noise

Active Publication Date: 2019-02-05
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the iron sludge produced by Fenton oxidation may cause secondary pollution, and the Fenton reaction has a high pH requirement, and the mineralization effect is limited; TiO 2 The representative photocatalytic oxidation has limited ability to utilize visible light; electrochemical oxidation is difficult to be widely used in industry due to its high cost.
The biological oxidation method also has certain limitations due to the long reaction cycle and large floor area, and it is difficult to control the normal metabolic process of microorganisms in the sludge for dyes, which have a special chemical structure and toxicity.

Method used

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  • Micro-nano bubble generating device and method and application thereof in dye wastewater treatment
  • Micro-nano bubble generating device and method and application thereof in dye wastewater treatment
  • Micro-nano bubble generating device and method and application thereof in dye wastewater treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0099] Embodiment 1 Preparation of micro-nano bubbles

[0100] 1. Connect the gas-liquid mixing pump, pressure dissolving tank, ejector and water tank in sequence to form a nano-micro bubble generating device capable of fluid circulation, and inject pure water into the water tank; among them, the water outlet pipeline of the pressure dissolving tank It is divided into two branches: one pipeline, branch 1, is connected with an ejector, and the other branch, branch 2, is connected with valves, pressure gauges and liquid flow meters;

[0101] 2. Start the functional components in the micro-nano bubble generating device, adjust the gas-liquid mixing pump and the air intake in the ejector, and generate fluid containing micro-nano bubbles.

[0102] Among them, the ratio of the suction volume of the ejector to the flow rate of branch 2 is 1:250, and the ratio of the suction volume of the gas-liquid mixing pump to the flow rate of branch 2 is 1:9.

[0103] Take a certain volume of wa...

Embodiment 2

[0105] Embodiment 2 waste water treatment (pH=3)

[0106] 1. Connect the gas-liquid mixing pump, pressure dissolving tank, ejector and water tank in sequence to form a wastewater treatment device capable of fluid circulation. Inject 6mg / L methylene blue aqueous solution into the water tank to adjust the pH of the aqueous solution to 3; among them, the pressure The water outlet pipeline of the dissolved gas tank is divided into two branches: one pipeline, branch 1, is connected with an ejector, and the other branch, branch 2, is connected with a valve, a pressure gauge and a liquid flow meter;

[0107] 2. Start each functional component in the wastewater treatment device, adjust the gas-liquid mixing pump and the air intake in the ejector, and conduct wastewater treatment at room temperature. Among them, the ratio of the suction volume of the ejector to the flow rate of branch 2 is 1:250, and the ratio of the suction volume of the gas-liquid mixing pump to the flow rate of bran...

Embodiment 3

[0108] Embodiment 3 wastewater treatment (temperature+defoamer)

[0109] The methylene blue wastewater treatment steps are the same as in Example 2, except that the treatment temperature of the methylene blue aqueous solution is further limited to 20°C, and the concentration of the defoamer is 0.00075%.

[0110] Among them, the defoamer used is polyether compounded with silicone defoamer (DT-882D, Guangdong Foshan Xushi Chemical Technology Co., Ltd.).

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Abstract

The invention provides a micro-nano bubble generating device and method and application thereof in dye wastewater treatment. The micro-nano bubble generating device provided by the invention comprisesa pressure dissolved gas tank, a gas and liquid mixing pump, a jet ejector and a water box. By adjusting the gas suction volume of the gas and liquid mixing pump and the jet ejector, the device provided by the invention can generate a large number of micro-nano bubbles with a slow rising speed and a diameter between 100nm and 300nm. Aiming at the problems of deep chroma, high COD content and difficult degradation of dye wastewater, the high-efficiency oxygenation and hydroxyl radical-producing properties of the micro-nano bubbles can non-selectively degrade organic matters in water, and the foam generated in the degradation process can be relieved by finely adjusting temperature, salt concentration, defoamer concentration and the like. The micro-nano bubble generating device and method provided by the invention have very high application value in dye wastewater treatment.

Description

technical field [0001] The invention belongs to the technical field of dye wastewater treatment, and in particular relates to a device and method for generating micro-nano bubbles and its application in dye wastewater treatment. Background technique [0002] Dye wastewater is mainly wastewater generated during the dye production process. Due to the variety of dyes in China and the complicated production process, dye wastewater often contains a lot of organic matter and salt. Most of the dyes have large molecular weight aromatic ring structures, which makes the organic matter in dye wastewater have stable performance, high COD, and difficult to degrade. [0003] At present, the treatment technologies of dye wastewater mainly include adsorption method, coagulation method, advanced oxidation method, biological oxidation method and so on. However, the adsorption method and the flocculation-sedimentation method produce a large amount of sludge, and the cost of the adsorbent or c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01F3/04B01F5/02C02F1/74C02F101/30
CPCC02F1/74C02F2305/023C02F2101/308B01F23/235B01F23/237611B01F25/281B01F2101/305
Inventor 余江陈鹏
Owner BEIJING UNIV OF CHEM TECH
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