Cleaning agent for ultrafiltration membrane

A cleaning agent and ultrafiltration membrane technology, which is applied in the field of ultrafiltration membrane cleaning agents, can solve the problems of short service life, high price, and low number of recycling times, and achieve the effects of reducing cleaning frequency, superior rinsing performance, and reducing treatment costs

Active Publication Date: 2014-05-07
NANTONG SUTONG SEPARATION ENG & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, all enterprises use commercially available general-purpose alkaline cleaning agents, which are not only expensive, but also have poor degreasing effects due to the lack of specificity of the formula, short service life after cleaning, and few recycling times, resulting in high operating costs for enterprises. high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] An ultrafiltration membrane cleaning agent, comprising in parts by weight: 7 parts of sodium dodecylbenzene sulfonate, 5 parts of fatty alcohol polyoxyethylene ether sulfonate sodium, 2 parts of carboxymethyl cellulose, and 3 parts of sodium citrate , 1 part of sodium carbonate, 2 parts of sodium hydroxide, 0.1 part of pectinase, 1 part of aliphatic polyoxyethylene ether, 0.5 part of potassium silicate.

[0011] Before using the above ultrafiltration membrane cleaning agent, it is first formulated into an aqueous solution with a mass percentage of 1%, and then the pH of the aqueous solution is adjusted to 10-11.

[0012] The obtained ultrafiltration membrane cleaning agent has a net washing power of 97.41% and a foam performance of 10.68mm. After the ultrafiltration membrane unit is used for 0.5 hours, the permeation flux of the cleaning agent reaches 500L / (m) 2 · H).

Embodiment 2

[0014] A cleaning agent for ultrafiltration membranes, comprising in parts by weight: 12 parts of sodium dodecylbenzene sulfonate, 8 parts of fatty alcohol polyoxyethylene ether sulfonate sodium, 6 parts of carboxymethyl cellulose, and 9 parts of sodium citrate , 4 parts of sodium carbonate, 8 parts of sodium hydroxide, 0.6 parts of pectinase, 7 parts of aliphatic polyoxyethylene ether, 1.9 parts of potassium silicate, 0.8 parts of polymeric sodium phosphate.

[0015] Before using the above ultrafiltration membrane cleaning agent, it is first formulated into an aqueous solution with a mass percentage of 1%, and then the pH of the aqueous solution is adjusted to 10-11.

[0016] The obtained ultrafiltration membrane cleaning agent has a net washing power of 95.68% and a foam performance of 11.08mm. After the ultrafiltration membrane unit is used for 0.5 hours, the permeation flux of the cleaning agent reaches 550L / (m) 2 · H).

Embodiment 3

[0018] A cleaning agent for ultrafiltration membranes, comprising in parts by weight: 10 parts of sodium dodecylbenzene sulfonate, 7 parts of fatty alcohol polyoxyethylene ether sulfonate sodium, 5 parts of carboxymethyl cellulose, and 7 parts of sodium citrate , 2 parts of sodium carbonate, 6 parts of sodium hydroxide, 0.2 parts of pectinase, 4 parts of aliphatic polyoxyethylene ether, 1.3 parts of potassium silicate, 3.5 parts of polymeric sodium phosphate.

[0019] Before using the above ultrafiltration membrane cleaning agent, it is first formulated into an aqueous solution with a mass percentage of 1%, and then the pH of the aqueous solution is adjusted to 10-11.

[0020] The obtained ultrafiltration membrane cleaning agent has a net washing power of 98.67% and a foam performance of 10.98mm. The permeation flux of the cleaning agent after the ultrafiltration membrane unit is used for 0.5h is 520L / (m) 2 · H).

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Abstract

The invention provides a cleaning agent for an ultrafiltration membrane. The cleaning agent comprises the following components in parts by weight: 7 to 12 parts of sodium dodecyl benzene sulfonate, 5 to 8 parts of sodium fatty alcohol polyoxyethylene ether sulfonate, 2 to 6 parts of carboxymethylcellulose, 3 to 9 parts of sodium citrate, 1 to 4 parts of sodium carbonate, 2 to 8 parts of sodium hydroxide, 0.1 to 0.6 part of pectinase, 1 to 7 parts of aliphatic polyoxyethylene ether, and 0.5 to 1.9 parts of potassium silicate. The cleaning agent for the ultrafiltration membrane has the advantages that more than 95% of cleaning capacity is reached, the rinsing performance is outstanding, an ultrafiltration device is not endangered, the deterioration of the membrane can be avoided, and membrane flux can be recovered to normal level after cleaning and remained within a certain cycle; in addition, the cleaning frequency is reduced, the treatment cost is decreased, and the cleaning liquid waste is easily handled.

Description

Technical field [0001] The invention belongs to the technical field of water treatment chemicals, and specifically relates to an ultrafiltration membrane cleaning agent. Background technique [0002] The oily wastewater from cold rolling mills of iron and steel companies mainly contains pollutants such as mineral oil and emulsifiers, and their direct discharge will cause serious pollution to the environment. Iron and steel companies generally use tubular aluminum oxide and zirconium oxide ultrafiltration membranes for removal. Oil treatment. However, due to the formation of the solute gel layer and the concentration polarization of the ultrafiltration membrane, it will cause the pollution of the ultrafiltration membrane, resulting in the decrease of membrane flux, the deterioration of the ultrafiltration effect, and even the formation of irreversible pollution of the membrane, causing serious losses . Therefore, only by choosing effective cleaning agents and cleaning method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/06
Inventor 葛红军徐丽梅杨伟东邱玉梅沙嘉敏
Owner NANTONG SUTONG SEPARATION ENG & TECH
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