Monovalent salt mixed solution nanofiltration separation method

A solid-liquid separation and solution technology, applied in the field of membrane engineering, can solve the problems that the effluent water quality cannot meet the reuse requirements, and achieve the effects of excellent water quality, stable operation, and low floor space

Active Publication Date: 2017-10-10
南京蔚华膜科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The processes for treating pigment wastewater include iron filings filtration-anaerobic-SOFB-aerobic, oxidation-biochemical-air flotation, coa

Method used

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  • Monovalent salt mixed solution nanofiltration separation method
  • Monovalent salt mixed solution nanofiltration separation method
  • Monovalent salt mixed solution nanofiltration separation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Example 1 Wastewater nanofiltration simulation test

[0073] The laboratory configures 1000mg / L CH 3 COONa and 1000mg / L NaCl mixed solution. Four nanofiltration membranes are used: GE's DL nanofiltration membrane, GE's DK nanofiltration membrane, Dow's NF90 nanofiltration membrane, Dow's NF270 nanofiltration membrane and a reverse osmosis membrane TRISEP X-20 reverse osmosis membrane. Permeable membrane for separation experiments. The separation process temperature is 25°C and the operating pressure is 1.5 MPa.

[0074] The above 5 kinds of nanofiltration membranes were used to carry out the separation test under the condition of pH 10.5, and the obtained rejection rates are shown in the following table:

[0075]

[0076] Under different pH conditions, the effect of nanofiltration membrane DL on Cl - and CH 3 COO - The retention rate is shown in the table below:

[0077]

[0078] Nanofiltration technology was used to treat the simulated pigment wastewater f...

Embodiment 2

[0079] Example 2 Treatment of Pigment Production Wastewater

[0080]Add acid to the production wastewater of Yanhuang 14 to adjust the pH to 4~6, carry out aeration, control the dissolved oxygen to 2~3mg / L, and send it to the iron-carbon micro-electrolysis tank for decolorization treatment. The iron-carbon micro-electrolysis filler is made of iron filings , Powdered activated carbon, the weight ratio of iron filings and powdered activated carbon is 5.6:1, COD 3705mg / L after treatment, the decolorized wastewater enters the aerobic pool for biochemical treatment, and then sent to the sedimentation tank for solid-liquid separation by sedimentation method, and then sent to microfiltration membrane for further filtration. After the water produced by the microfiltration membrane is sequentially treated by activated carbon adsorption and ozone oxidation, the wastewater COD is 430mg / L, and after adjusting the pH to 10.0, it is sent to the ultrafiltration membrane for deep filtration. ...

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Abstract

The invention belongs to the technical field of membrane engineering and relates to a monovalent salt mixed solution nanofiltration separation method. Besides, the invention also relates to a pigment wastewater desalinating and recycling method. The monovalent salt mixed solution nanofiltration separation method successfully achieves separation of CH3COO- and Cl- in solution through nanofiltration membranes and has the advantage of being good in separating effects. The monovalent salt mixed solution nanofiltration separation method can achieve treatment and recycling of pigment wastewater. The pigment wastewater is processed through decoloration, solid-liquid separation, adsorption and oxidation, then the pH of the processed pigment wastewater is regulated to be alkaline, the reacted water is processed through ultrafiltration membranes, ultrafiltration membrane concentrate water returns to a pH regulating tank, and fresh water flows into the nanofiltration membranes for treatment; fresh water processed through the nanofiltration membranes enters reverse osmosis membranes, and produced concentrate water are concentrated for recycling; reverse osmosis membrane concentrate water enters an electrodialyzer, electrodialytic fresh water flows back and serves as reverse osmosis membrane inflow water, electrodialytic concentrate water is evaporated in an evaporator, solid obtained from evaporation and concentration can serve as industrial salt; the entire separation process has no water pollutant discharge.

Description

technical field [0001] The invention belongs to the technical field of membrane engineering, and relates to a nanofiltration separation method of a monovalent salt mixed solution. In addition, the invention also relates to a method for desalination and reuse of pigment waste water. Background technique [0002] Pigment is a colored substance with decorative and protective functions. With the development of society, pigments are widely used, and the pigment industry plays an increasingly important role in economic construction. According to the molecular structure and composition, pigments can be divided into organic pigments, inorganic pigments and metallic pigments. Compared with other pigments, organic pigments have the advantages of high tinting strength, bright colors, diversified varieties, bright and comprehensive colors, and low toxicity. It is widely used in the coloring field of printing ink, plastic, rubber and paint. Overview of the international organic pigm...

Claims

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Application Information

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IPC IPC(8): C02F1/44C02F9/10
CPCC02F1/442C02F9/00C02F1/78C02F1/722C02F1/725C02F1/46104C02F1/444C02F1/4693C02F1/4672C02F2001/007C02F1/283C02F1/285C02F1/048C02F1/30C02F1/38C02F1/001Y02A20/131
Inventor 孙世鹏王琛陈伯志闫亚男王珏王潇贾添智邢卫红
Owner 南京蔚华膜科技有限公司
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