MemChem MCT253

Summary

Product identification

• Product Name: MemChem* MCT253
• Description: Liquid acid membrane cleaner
• Type: Low pH liquid formulation containing organic acid reductant and solvent.
• Purpose: Designed to dissolve metal oxides (e.g., iron, manganese) and other similar foulants from reverse osmosis (RO), nanofiltration (NF), ultrafiltration (UF), and microfiltration (MF) membrane system surfaces.

Treatment and feeding requirements

• Feed System: Apply using membrane cleaning equipment supplied by the membrane system manufacturer. Contact SUEZ representative if such a system is unavailable.
• Dilution: Product must be diluted prior to introduction into the membrane system. Recommended dilution is 0.2% to 1.5% by weight.
• Materials Compatibility: Use corrosion-resistant equipment (e.g., PVC) for storage and preparation. Pumping materials in contact with diluted product should also be corrosion-resistant.

Application rate for UF/MF systems

Maintenance Clean

• Concentration: 0.2% - 0.4% w/v
• Frequency: Once/week to daily

Recovery Clean

• Concentration: 0.5% - 1.5% w/v
• Frequency: 1 - 6 months

Cleaning instructions

General procedure:

1. Inspect and clean/flush cleaning tank, hoses, and cartridge filters. Install new cartridge filters.
2. For maintenance cleaning, begin aeration at UF aeration rate and drain membrane tank.
3. Perform backwash and gravity drain prior to cleaning to remove solids, using UF permeate.
4. Fill cleaning tank with MF/UF permeate. Turn on agitator or recirculation pump.
5. Heat water to the maximum allowed temperature as per system manufacturer, normally below 95°F (35°C).
6. Prepare cleaning solution by dosing chemical on CIP pump discharge or premixing in CIP tank.
7. Check and adjust solution pH if necessary. Avoid exceeding maximum chemical concentration or pH limits of the membrane.
8. For maintenance cleaning, soak membranes for 60 to 90 minutes or per membrane manufacturer's instructions. Heavily fouled membranes may require longer soak times.
9. A cycle of 15 minutes each of recirculation and soaking may improve cleaning efficiency.
10. Spent solution can be returned to CIP tank for neutralization or discharged to drain.
11. Adequately flush/rinse membrane train with feedwater until conductivity of rinsing water matches feedwater conductivity.
12. For heavily fouled MF/UF systems, multiple maintenance cleaning cycles or increased frequency may be required. If cleaning is unsuccessful, contact SUEZ for further evaluation.
13. For recovery cleaning, follow steps 1-11. Total soak and recirculation time can vary between 4 to 12 hours depending on fouling.
14. After returning the system to service, measure permeate flow rate, transmembrane pressure (TMP), and temperature.
15. Addition of Kleen* MCT404 (0.25%–0.5%) may improve cleaning efficiency and membrane permeability.
16. Extended soaks and heated cleaning solutions generally improve results. Consult SUEZ representative for details.
17. For SUEZ ZeeWeed* systems only: Aerate the tank while slowly draining to prevent sludge formation and expose membranes to aeration.
18. Use a SUEZ ZeeWeed Recovery Clean Log Sheet to record cleaning information.

Measuring successful cleaning

• A successful recovery clean should recover and maintain >80% of the original permeability.
• Trend the temperature-corrected permeability (permeate flow rate, TMP, and temperature).

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Disclaimer: This extraction may miss figures, footnotes, or revisions. Contractual data must match the OEM PDF revision used on the project.

Official datasheet (PDF)

Lenntech datasheet mirror