Unlock instant, AI-driven research and patent intelligence for your innovation.

Membrane distillation system for treating salt and surfactant containing wastewater and application thereof

A surfactant and membrane distillation technology, applied in the field of membrane distillation systems, can solve the problems of membrane fouling and membrane wetting, and achieve the effects of low energy consumption, small footprint and easy operation

Inactive Publication Date: 2020-11-27
HOHAI UNIV
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of membrane fouling and membrane wetting in traditional membrane distillation technology when treating wastewater containing surfactants and salt ions, the present invention provides a membrane distillation system for treating wastewater containing salt and surfactants

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Membrane distillation system for treating salt and surfactant containing wastewater and application thereof
  • Membrane distillation system for treating salt and surfactant containing wastewater and application thereof
  • Membrane distillation system for treating salt and surfactant containing wastewater and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The object of treatment in this embodiment is wastewater containing sodium dodecyl sulfate SDS and NaCl, the concentration of SDS is 0.5mmol / L, and the concentration of NaCl is 1g / L.

[0054] The membrane distillation component is a flat-plate membrane distillation component, and the microporous hydrophobic membrane material is polyvinylidene fluoride (PVDF), with an average pore size of 0.45 μm; the water temperature on the hot side of the membrane distillation component is 55 ° C, and the water temperature on the cold side is 20 ° C. The cross flow velocity is 0.005m / s, and the total air flow is 2cm 3 / s, adjust the current of the ozone generator to 27A, and the corresponding ozone concentration is 13mg / L.

[0055] During the operation, the SDS-containing wastewater in the feed tank is heated and sent to the hot side of the membrane distillation module. The ozone bubbles are in short continuous shape and enter the membrane device circulation together with the hot wast...

Embodiment 2

[0065] The object of treatment in this embodiment is wastewater containing sodium dodecyl sulfate SDS and NaCl, the concentration of SDS is 1 mmol / L, and the concentration of NaCl is 0.5 g / L.

[0066] The membrane distillation component is a flat-plate membrane distillation component, and the microporous hydrophobic membrane material is polyvinylidene fluoride (PVDF), with an average pore size of 0.45 μm; the water temperature on the hot side of the membrane distillation component is 55 ° C, and the water temperature on the cold side is 20 ° C. The cross flow velocity is 0.005m / s, and the total air flow is 2cm 3 / s, adjust the current of the ozone generator to 27A, and the corresponding ozone concentration is 13mg / L.

[0067] During the operation, the waste water containing SDS and NaCl in the feed tank is heated and sent to the hot side of the membrane distillation module. The ozone bubbles are in short continuous shape and enter the membrane device circulation together with ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a membrane distillation system for treating salt and surfactant containing wastewater and application thereof. The membrane distillation system comprises a feeding assembly, amembrane distillation assembly, an ozone assembly, an overflow assembly, a receiving assembly and a tail gas treatment assembly. During operation, ozone generated by the ozone generator performs heatexchange circulation on the surface of a hydrophobic membrane along with hot side water flow of the membrane distillation assembly, through the cooling effect of cold side circulating water of the membrane distillation assembly, hot side water vapor enters the cold side across the membrane and flows into an overflow bottle, and water of the overflow assembly flows into the receiving assembly to becollected. The treatment system provided by the invention has the advantages of low energy consumption, small occupied area, simplicity and convenience in operation and the like; the ozone and the membrane distillation device are combined to reduce the concentration of the surfactant in the wastewater, meanwhile, airflow generates a shearing force effect on the surface of the membrane, scaling ofthe surfactant and salt ion colloid is reduced, the effects of slowing down membrane pollution and wetting the membrane are achieved, and the anti-pollution capacity of the membrane distillation device is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a membrane distillation system for treating wastewater containing salt and surfactants and an application thereof. Background technique [0002] Surfactants are used as detergents, emulsifiers, dispersants, etc. in almost all walks of life. The global annual consumption of surfactants has exceeded 10 million tons, so a large amount of surfactants are inevitably discharged into the environment. . The surfactant in the wastewater will cause the water body to foam, reduce the rate of reoxygenation and the degree of oxygenation in the water, deteriorate the water quality, affect the survival of aquatic organisms, and hinder the self-purification of the water body. In addition, it can also emulsify other pollutants in the water body, increasing the concentration of pollutants and causing indirect pollution. [0003] Membrane distillation is known as "the wat...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C02F1/44C02F1/78
CPCC02F1/447C02F1/78C02F2201/782C02F2201/784C02F2209/02C02F2209/38C02F2209/40C02F2303/02C02F2303/14
Inventor 严晓菊王国栋暴瑞玲李珺宇成士荣
Owner HOHAI UNIV