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Hollow fiber membrane cleaning agent and preparation method and application thereof

A fiber membrane and cleaning agent technology, applied in the field of membrane cleaning, can solve the problems of membrane pollution, shortened membrane life, increased content of inorganic iron salts and aluminum salts, etc., to speed up the reaction process, improve the cleaning effect, and save cleaning time.

Active Publication Date: 2014-09-24
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although sodium hypochlorite is widely used as a common membrane cleaning agent, the cleaning effect is not good for membrane modules with serious pollution or sewage treatment plants with special influent water quality.
In order to achieve the expected cleaning goal, managers often increase the concentration of sodium hypochlorite cleaning solution and prolong the membrane cleaning time, which not only increases the cost of membrane cleaning, but also affects the microbial activity in the reaction tank and the performance of the membrane, resulting in the next Periodic membrane fouling faster and membrane life shortened
In addition, due to the serious eutrophication of the water body and the increase in the discharge requirements for nitrogen and phosphorus, many sewage treatment processes have added chemical phosphorus removal equipment, so the content of inorganic iron salts and aluminum salts in the biochemical pool has increased, and the inorganic components of membrane pollution have also increased.
It is difficult to achieve the ideal cleaning effect with sodium hypochlorite or citric acid cleaning
[0005] Therefore, the current research on membrane cleaning technology still needs to be deepened.

Method used

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  • Hollow fiber membrane cleaning agent and preparation method and application thereof
  • Hollow fiber membrane cleaning agent and preparation method and application thereof
  • Hollow fiber membrane cleaning agent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1. Test materials:

[0042] 1. Membrane module: PVDF hollow fiber membrane module such as figure 1 As shown, the length of the membrane filament is 0.45m, the inner diameter is 0.95mm, the outer diameter is 2.45mm, and the membrane pore diameter is 0.3μm, a total of 156 membrane filaments, and the membrane area is 0.5m 2 .

[0043] 2. Cleaning reagent: Keep the concentration of sodium hypochlorite constant, change the concentration and type of penetrant, and prepare hollow fiber membrane cleaning agents with 6 concentration gradients in groups A and B, and the volume of the cleaning solution is 40 liters. The composition of hollow fiber membrane cleaning agent is shown in Table 1.

[0044] Table 1 hollow fiber membrane cleaning agent concentration composition (unit: mg / liter)

[0045]

[0046] 3. Membrane specific flux measurement device: membrane specific flux measurement device such as figure 2 As shown, it includes a membrane module 2 , a peristaltic pump 3 ,...

Embodiment 2

[0055] 1. Test materials:

[0056] 1. Membrane module: Same as Example 1.

[0057] 2. Cleaning reagent: keep the mass concentration of sodium hypochlorite constant, change the concentration of complexing agent disodium EDTA, and prepare 6 cleaning solutions with different concentration gradients. The volume of the cleaning solution is 40 liters. The composition of hollow fiber membrane cleaning agent is shown in Table 2.

[0058] Table 2 hollow fiber membrane cleaning agent concentration composition (unit: mg / L)

[0059]

[0060] 3. Membrane specific flux measuring device: the same as in Example 1.

[0061] 2. Test method

[0062] 1. Measure the specific flux of the clean membrane. Using the membrane specific flux measurement test device (see figure 2 ) to measure the clear water flux of the clean membrane under different transmembrane pressure (TMP), the clear water temperature is 26°C-27°C, with TMP as the abscissa and the membrane flux as the ordinate, draw the cha...

Embodiment 3

[0069] 1. Test materials:

[0070] 1. Membrane module: Same as Example 1.

[0071] 2. Cleaning reagent: keep the mass concentration of sodium hypochlorite constant, change the concentration of penetrating agent AEP and complexing agent disodium EDTA, and prepare 6 kinds of hollow fiber membrane cleaning agents, the volume of cleaning solution is 40 liters. The composition of hollow fiber membrane cleaning agent is shown in Table 3.

[0072] Table 3 hollow fiber membrane cleaning agent concentration composition (unit: mg / L)

[0073] Cleaning reagent number

19

20

21

22

23

24

sodium hypochlorite

1000

1000

1000

1000

1000

1000

Penetrant AEP

0

0

150

75

100

100

complexing agent

0

100

0

50

150

150

[0074] 3. Membrane specific flux measuring device: the same as in Example 1.

[0075] 2. Test method

[0076] 1. Determination of the specific flux of th...

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Abstract

The invention provides a hollow fiber membrane cleaning agent and a preparation method and application thereof. The hollow fiber membrane cleaning agent comprises: sodium hypochlorite and a cleaning agent, which is at least one selected from the group consisting of a penetrating agent and a complexing agent. The hollow fiber membrane cleaning agent provided by the invention can effectively improve the cleaning effect on the hollow fiber membrane, shortens the cleaning time, is convenient to use, and does not generate secondary pollution.

Description

technical field [0001] The invention relates to the technical field of membrane cleaning, in particular to a hollow fiber membrane cleaning agent and its preparation method and application. Background technique [0002] Membrane Bioreactor (MBR) is a new type of sewage treatment and reuse process that has developed rapidly in recent years. Compared with the traditional activated sludge method, it has the characteristics of good effluent quality, small footprint, and low sludge output. After years of research and practice, MBR has gradually been rapidly applied and promoted in practical engineering. [0003] At present, in the field of municipal sewage and industrial wastewater treatment, MBR technology has become a mature sewage treatment process. This process has been adopted in the upgrading and transformation of many urban sewage plants in our country. However, in actual engineering, the problem of membrane fouling that affects the stable operation of the system and in...

Claims

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Application Information

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IPC IPC(8): B01D65/06C02F3/00
Inventor 黄霞朱宁伟孙剑宇雷霆文湘华陈亦力关晶薛涛俞开昌
Owner TSINGHUA UNIV
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