AWC® UF-428

Advantages

• Powder formulation containing chlorine, dispersants, surfactants and other cleaning compounds specifically designed for cleaning microfiltration (MF) and ultrafiltration (UF) surfaces and pores
• Penetrates and removes heavy organic foulants and biological slime
• Disperses inorganic particulates such as silts, clays and other colloidal particles
• Dissolves metal hydroxides from coagulants
• Buffered to maintain target pH range even when product is accidentally overdosed
• Compatible with most chlorine tolerant microfiltration and ultrafiltration modules
• Certified by NSF to NSF/ANSI Standard 60 for use in potable systems

Typical Properties

• Appearance: White granular powder
• Odor: Chlorine like odor
• Chlorine Content (1% Solution): 100 ppm available

Packaging

• 50 lb. pail and 400 lb. non-returnable plastic drums

Safety and Handling

Store in cool, dry and well-ventilated area. Keep containers closed. Wash contaminated clothes before re-use. Wash thoroughly after handling. For more information, see the Safety Data Sheet provided with this product.

Chemical Feeding and Control

The cleaning solution should be prepared using MF/UF filtrate. For best results, avoid using high hardness water. Make cleaning solution using 17 lbs of AWC UF-428 for every 100 gallons of water (2% by wt. Solution). A minimum total cleaning time of 6 hours is typically recommended for heavy fouling. Heating the solution to the maximum temperature allowed by the module manufacturer will enhance cleaning results.

Cleaning procedure is as follows:

1. Backwash with MF/UF filtrate (or preferably use RO permeate where available) for 15 minutes.
2. Circulate the cleaning solution throughout the modules, with the filtrate valve closed, in the feed direction for 30 minutes (for positive pressure MF/UF).
3. Alternate with soak for 30 minutes.
4. Reverse the direction of the flow and recirculate for 30 more minutes .
5. Repeat steps 1 – 3 for a total of 4.5 hours contact time.
6. Open filtrate valve fully, and/or close concentrate fully.
7. Circulate through the pores for 30 minutes.
8. Alternate with soak for 30 minutes.
9. Circulate through the pores for 30 minutes.
10. Backwash with MF/UF filtrate (or preferably use RO permeate where available) for 15 minutes.

If pH decreases below the target pH range of 11–12, add more AWC UF-428 to maintain target pH range throughout the entire cleaning process. Do not exceed membrane manufacturer’s recommended exposure time to high pH cleaners, and do not exceed the membrane’s chlorine tolerance. After the cleaning is finalized the modules must be flushed with MF/UF filtrate.