FEDZ has adopted a host of improvement measures to increase the efficiency of water reclamation. The ultrafiltration (UF) and the RO membranes are cleaned more frequently to maintain system stability. The cleaning methods include backward flush, maintenance cleaning, mechanical maintenance cleaning and automated chemical cleaning. Backward flush involves flushing the membrane surface with reverse water flow to remove pollutants. Maintenance cleaning rinses off organic and inorganic matters on the membrane surface using a low-concentration chemical solution. Mechanical maintenance cleaning eliminates dirt through brushing or ultrasonic cleaning and automatic chemical cleaning is a closed-looped cyclic cleaning process.
In addition, the replacement rate of new filter membranes has been increased from 62% to 71%, which further improves the filtering and operating efficiency. In 2024, these measures improved the recycling rate of reclaimed water from 69% to 71%.