With its unique porosity, Filtralite® Clean filter media offers optimum conditions for biofilm growth and for water to flow through the filter bed in order to retain and remove more contaminants.
Filtralite® Clean Powers Efficient Wastewater Treatment in Dalian, China
To meet strict discharge standards, the Dalian WWTP (serving 432,000 residents) upgraded its biological treatment system using Filtralite® Clean filter media in two Biofor® stages — one for BOD and SS removal, the other for nitrification.
Filtralite® Clean is applied in a fixed-bed system for wastewater treatment
The process begins with primary sedimentation in four tanks using lamella separators. Biological treatment follows in two stages:
- The first removes organic matter and suspended solids using 12 Biofor filters filled with Filtralite® Clean HR 3–6, a round expanded clay aggregate that supports biofilm growth.
- The second stage involves nitrification, also carried out in 12 Biofor filters (same surface area) using Filtralite® Clean HC 2.5–5 as the filter media.
Both filter types receive process air via blowers to maintain aerobic conditions.
Approximately 40% of the treated water is chlorinated and reused for industrial purposes.
Results
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BOD₅ reduced from 216 mg/L to 3 mg/L
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COD dropped from 480 mg/L to 30 mg/L
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SS cut from 350 mg/L to 8 mg/L
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NH₄-N brought down to 1.1 mg/L
Mohammed Kastawy Area Sales Manager – MENA Region Mobile: +971565503535 Email : mohammed.kastawy@saint-gobain.com LinkedIn: www.linkedin.com
