Chemical Agents Available for Chemical Cleaning of Toray Submerged Membrane Element for MBR(Manual)

May 27, 2021


When considering chemical cleaning agents, try and select a cleaner that is most appropriate for the suspected foulant. Selecting an inappropriate cleaner can result in further loss in membrane performance or possible membrane damage. Table 1 lists suitable cleaning chemicals and standard cleaning conditions..


Table 1  Cleaning Chemicals and Standard Cleaning Conditions by Contaminan

Contaminant Chemical Solution concentration Amount used Hold time
Organic matter Sodium hypochlorite 2,000-6,000 mg/L
 (Effective chlorine concentration)
0.9 L/element
(NHP210 Series)
5 L/element
(TMR140 Series)
3 L/element
(TMR090 Series)
1 to 3 hours
Inorganic matter
(either of the two chemicals)
Oxalic acid* 0.5-1.0 wt% 1 to 3 hours
Citric acid 1-3 wt% 1 to 3 hours
* Oxalic acid should not be applied when wastewater contains calcium, since calcium oxalate may form on the membrane surface which can choke membrane pores.

This content does not intend to guarantee the results of application of the information provided herein or the safety and the compatibility of this product.
Before using this product, the user is asked to check for its safety and compatibility with the intended purpose.
This content is subject to revision from time to time.
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This content is extracted from “Submerged Membrane Module for MBR TORAY “MEMBRAYTM” Instruction Manual”(the Manual).  Please refer to other contents stated in the Manual.
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