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Method and device for cleaning landfill leachate ultrafiltration membrane assembly

A technology of landfill leachate and cleaning device, applied in ultrafiltration, chemical instruments and methods, membrane technology, etc., can solve the problems of poor cleaning effect, complex composition of landfill leachate and inapplicability, and achieve the effect of improving permeability

Inactive Publication Date: 2017-12-12
何锦宸
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the cleaning methods of ultrafiltration membranes mainly include physical cleaning and chemical cleaning. The components in landfill leachate are complex, and the cleaning effect of physical cleaning methods is poor, which is basically not applicable. Currently, chemical cleaning is generally used for ultrafiltration membranes of landfill leachate.
The structure and composition of the pollutants adhered to the ultrafiltration membrane of landfill leachate are complex. Practice has shown that, especially the complex coated substances formed by metal cations and organic pollutants, flocculants and microorganisms, have great influence on the formulation of ultrafiltration membrane cleaning solution and Cleaning sequence is particularly sensitive and difficult to remove with a single chemical cleaning

Method used

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  • Method and device for cleaning landfill leachate ultrafiltration membrane assembly

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Experimental program
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Effect test

Embodiment 1

[0025] see figure 1 , a cleaning device specially for landfill leachate ultrafiltration membrane modules, including ultrafiltration membrane module body 1, alkali solution tank 2, acid solution tank 3, clean water tank 4, lye solution washing pump 5, acid solution washing pump 6 , clear water flushing pump 7, liquid inlet four-way pipe joint 8 and liquid outlet four-way pipe joint 9, the first nozzle of liquid inlet four-way pipe joint 8 is communicated with lye tank 2 by lye liquid outlet pipeline 10, and liquid inlet The second nozzle of the four-way pipe joint 8 is communicated with the acid tank 3 through the acid liquid outlet pipeline 11, and the third nozzle of the liquid inlet four-way pipe joint 8 is communicated with the clean water tank 4 through the clear water outlet pipeline 12, and the liquid inlet The fourth nozzle of the four-way pipe joint 8 is connected to one end of the ultrafiltration membrane module body 1 through the liquid inlet pipeline 13; Connected,...

Embodiment 2

[0031]The landfill leachate ultrafiltration membrane module in this embodiment is made of polyvinylidene fluoride, has a molecular weight cut-off of 100,000 Daltons, and operates in cross-flow filtration. After testing, the main pollutants in the filtered landfill leachate are fatty acids, humus, amino acids and other organic substances, and the concentrations of heavy metal ions and ammonia nitrogen inorganic substances are relatively low. In the initial stage of filtering the landfill leachate by the ultrafiltration membrane module, the operating pressure of the ultrafiltration membrane module is 5.7bar, and the permeate flux is 16m 3 / h, after filtering the landfill leachate for a period of time, the operating pressure of the ultrafiltration membrane module rises to 6.5bar, and the permeate flux drops to 10m 3 / h, indicating that there are many attachments on the ultrafiltration membrane module. After testing, the attachment on the ultrafiltration membrane is mainly a compl...

Embodiment 3

[0040] The landfill leachate ultrafiltration membrane module in this embodiment is made of polyvinylidene fluoride, has a molecular weight cut-off of 100,000 Daltons, and operates in cross-flow filtration. After testing, the main pollutants in the filtered landfill leachate are heavy metal ions and ammonia nitrogen inorganic substances, and the relative concentrations of fatty acids, humus, amino acids and other organic substances are relatively low. In the initial stage of filtering the landfill leachate by the ultrafiltration membrane module, the operating pressure of the ultrafiltration membrane module is 5.6bar, and the permeate flux is 15m 3 / h, after filtering the landfill leachate for a period of time, the operating pressure of the ultrafiltration membrane module rises to 6.5bar, and the permeate flux drops to 10m 3 / h, indicating that there are many attachments on the ultrafiltration membrane module. After testing, the attachment on the ultrafiltration membrane is main...

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Abstract

The invention discloses a method for cleaning a landfill leachate ultrafiltration membrane assembly and a matched cleaning device. The cleaning method comprises the following steps: preparing an alkaline cleaner and an acidic cleaner; detecting main components of pollutants in landfill leachate, cleaning the pollutants by adopting an alkaline washing-clean water rinsing-acid pickling-clean water rinsing method when the main components of the pollutants in the landfill leachate are organic matters; and cleaning by adopting an acid pickling-clean water rinsing-alkaline washing-clean water rinsing method when the main components of the pollutants in the landfill leachate are inorganic metal ions. According to the method disclosed by the invention, the pollutants of complicated structures attached onto the ultrafiltration membrane assembly can be effectively removed, the cleaning effect is effectively improved, the performance of the ultrafiltration membrane assembly is restored, and the stable operation of the ultrafiltration membrane system is ensured.

Description

technical field [0001] The invention relates to the field of membrane technology for water supply and wastewater treatment and purification, in particular to a cleaning method and cleaning device for landfill leachate ultrafiltration membrane components. Background technique [0002] Membrane separation technology (Membrane Separation Technique) is a new high-efficiency separation technology, which has been internationally recognized as the most promising major high-tech production technology from the end of the 20th century to the middle of the 21st century. Ultrafiltration technology is a membrane separation technology developed in the 1960s and 1970s. Its basic principle is to use the selective screening performance of membrane pores to separate, purify and concentrate substances. Compared with traditional separation methods, ultrafiltration technology has the ability to Low power consumption, high single-stage separation efficiency, simple equipment, no pollution, high s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/06B01D61/20C02F1/44
CPCB01D61/14B01D61/20B01D65/02B01D2321/162B01D2321/164C02F1/444
Inventor 何锦宸
Owner 何锦宸
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