Passavant®
Horizand® horizontal filtration
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The patented Passavant® horizontal filtration Horizand® technology is the (flow) direction of the future. In contrast to upflow or downflow reactors, it offers considerable advantages.
Unique Features
- Lesser volume: small footprint and simple structural design
- No stagnant water over the filter medium, less uncontrolled oxygen entry (relevant for denitrification) & no algae growth when exposed to sunlight
- Continuous filtration operation
- Less space required due to an external backwashing unit
- Less air flow for backwashing
- Additional filtration capacity when converting existing filter tanks
- Defined filter layer thicknesses
- Flexible Arrangements
- Easy operation and handling
Distinctive features compared to other technologies
Significant smaller footprint with the same filtration area compared to continuously operated upstream flow slide bed filters, at least in part due to the external washing unit, avoiding additional space usage within the reactor due to expansion/backwashing.
In contrast to classic (discontinuous) vertical filtration, no space is wasted for expansion/backwashing. This means the footprint is significantly smaller and the civil engineering costs for new systems are considerably lower.
