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

A waste water treatment and waste water technology, which is applied in the direction of oxidized water/sewage treatment, special compound water treatment, water/sludge/sewage treatment, etc. It can solve the problems of difficulty in controlling the normal metabolic process of microorganisms, limited utilization of visible light, and cost of electrochemical oxidation. Advanced problems, to achieve good application value, less foam, less noise

Active Publication Date: 2020-06-02
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, method and application in dye wastewater treatment
  • Micro-nano bubble generating device, method and application in dye wastewater treatment
  • Micro-nano bubble generating device, method and application 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 device and method for generating micro-nano bubbles and its application in dye wastewater treatment. The device for generating micro-nano bubbles in the invention includes a pressure dissolved gas tank, a gas-liquid mixing pump, a jet and a water tank. The device of the invention can generate a large number of micro-nano bubbles with a slow rising speed and a diameter mostly between 100nm and 300nm by adjusting the suction volume of the gas-liquid mixing pump and the ejector. Aiming at the problems of deep chroma, high COD, and difficult degradation of dye wastewater, the high-efficiency oxygenation and hydroxyl radical production characteristics of micro-nano bubbles can degrade organic matter in water non-selectively, and the foam generated during the degradation process can be adjusted by fine-tuning the temperature , salt concentration, defoamer concentration, etc. The device and method for generating micro-nano bubbles provided by the invention have extremely high application value in the treatment of dye wastewater.

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 Patents(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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