Wastewater advanced treatment method coupling membrane and electricity

A technology of advanced treatment and electrical coupling, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., to achieve the effect of reducing cell voltage, saving energy consumption, and high conductivity

Active Publication Date: 2015-09-30
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to propose an energy-saving, high-efficiency, and environmental-friendly membrane-electrically coupled advanced wastewater treatment method aimed at the bottleneck problem of high TDS concentrated water treatment containing organic pollutants in the advanced treatment of wastewater membrane filtration and resource recovery processes.

Method used

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  • Wastewater advanced treatment method coupling membrane and electricity
  • Wastewater advanced treatment method coupling membrane and electricity
  • Wastewater advanced treatment method coupling membrane and electricity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Raw water

[0031] The biochemical tail water discharged from a sewage treatment plant is used as the raw water. The water quality is shown in Table 1-1:

[0032] Table 1-1 Raw water quality

[0033]

[0034] (2) Membrane filtration treatment

[0035] The membrane module in the membrane filtration unit uses nanofiltration membrane (its molecular weight cut-off is 150~300), the operating pressure is 0.5~1.0MPa, the operating temperature is 25°C, the fresh water production rate of nanofiltration membrane is 70%, and the water quality is shown in Table 1- 2:

[0036] Table 1-2 Freshwater quality after membrane filtration

[0037]

[0038] The test results show that the quality of fresh water after membrane filtration meets the standards for cooling water, washing water, process and product water in GB / T 19923-2005 "Water Quality for Industrial Water Quality for Urban Sewage Reuse and Utilization".

[0039] (3) Electrocatalytic oxidation treatment

[0040] Th...

Embodiment ２

[0052] The biochemical effluent tail water is the same as the example, and the water quality is shown in Table 2-1:

[0053] Table 2-1 Raw water quality

[0054]

[0055] (2) Membrane filtration treatment

[0056] The membrane components in the membrane filtration unit are reverse osmosis membranes (the molecular weight cut-off is greater than 100), the operating pressure is 1.0~1.5MPa, the operating temperature is 10°C, the fresh water production rate of the nanofiltration membrane is 70%, and the water quality is shown in Table 2-2 :

[0057] Table 2-2 Freshwater quality after membrane filtration

[0058]

[0059] The test results show that the quality of fresh water after membrane filtration meets the standards for cooling water, washing water, process and product water in GB / T 19923-2005 "Water Quality for Industrial Water Quality for Urban Sewage Reuse and Utilization".

[0060] (3) Electrocatalytic oxidation treatment

[0061] The yield of concentrated water af...

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Abstract

A wastewater advanced treatment method coupling membrane and electricity belongs to the technical field of wastewater treatment. The treatment method comprises the following steps: discharged wastewater is filtered through a membrane filtration device to obtain fresh water and concentrated water; the fresh water is recycled, the concentrated water is conveyed into an electrocatalysis and electrooxidation device, and the organic pollutants and organisms in the concentrated water are treated and decomposed by electrocatalysis and electrooxidation; the obtained reclaimed water is conveyed into a bipolar membrane electrodialysis device, and the inorganic salt in the reclaimed water is transformed into acid and alkali, so that resource utilization is achieved; the wastewater with the inorganic salt separated by the bipolar membrane electrodialysis device is adopted as scenic environmental water. According to the treatment method, membrane and electricity are coupled, so that advanced treatment of wastewater, material recycling and emission reduction of pollutants are achieved; all water quality indexes of the fresh water and the concentrated water treated through the treatment method respectively meet the standards of GB/ T 19923-2005 The Reuse of Urban Recycling Water-Water Quality Standard for Industrial Uses and GB/ T 18921-2002 The Reuse of Urban Recycling Water-Water Quality Standard for Scenic Environment Use.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to an energy-saving, high-efficiency, and environment-friendly membrane-electrically coupled wastewater advanced treatment method. Background technique [0002] With the development of society, the shortage of resources is becoming more and more serious, especially water resources. Various production activities produce a large amount of effluent wastewater, such as wastewater from pharmaceuticals, printing and dyeing, electroplating, papermaking, and industrial parks. Although the waste water is discharged outside after secondary biochemical treatment, the pH of the tail water is 6~9, the COD Cr (Chemical Oxygen Demand) 60~150mg / L, TDS (Total Dissolved Solids) 2000~6000 mg / L, the amount of discharged wastewater and pollutants is still quite huge. Therefore, it is imminent to reduce the discharge of these waste water and pollutants, and the advanced treatme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06
Inventor 王家德姚佳超黄国龙沈江南
Owner ZHEJIANG UNIV OF TECH
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