In 2000, a new wastewater treatment plant was commissioned in the city of Dalian, China, to treat domestic wastewater for 432,000 residents — equivalent to 120,000 m³ per day.
To meet the treatment requirements, a biological fixed-bed solution was selected. The water first undergoes pre-treatment, including screening and grit and grease removal, followed by primary sedimentation in four tanks equipped with lamellar settlers.
The biological treatment process is divided into two stages. In the first stage, 12 BIOFOR® filters remove organic matter and suspended solids. These filters use Filtralite® Clean HR 3–6, a round expanded clay aggregate that serves as a highly effective biofilm carrier.
In the second stage, nitrification takes place in another set of 12 BIOFOR® filters with the same surface area. These filters use Filtralite® Clean HC 2.5–5 as the filtration media. In both stages, process air is supplied by blowers to support biological activity.
Approximately 40% of the treated water is disinfected with chlorine and reused as recycled water for industrial purposes, contributing to sustainable water resource management.
Designed for wastewater treatment plants and treatment of industrial waters, Filtralite Clean is a filter media suitable for both biological treatment and tertiary filtration.
