Compact Pretreatment Unit

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Aquasystems International N.V. SFA enviro

Halle, Belgium

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The compact pretreatment unit EnviroPrep is machine-welded in stainless steel with three functions, screening, sand removal, and fat removal of raw effluents. Enviromax units are designed to accept flows from 10 up to 500 m3/hr, but several units can be installed in parallel to accept flow variation due to seasonality or higher flow. Efficient screening is performed with a Spirascreen adapted to each model. Sand and fat removal is performed inside a longitudinal tank in continuation to the screening phase.
LAYOUTS of Compact Pretreatment Unit

Fat outlet
Effluent inlet
Solid waste
Sand outlet
Treated effluent outlet

SCREENING AND COMPACTING
The solids are retained by the grid and then extracted and conveyed by the screw to the compaction zone. The compaction can be integrated into the screening machine, or carried out by an Enviropac transversal compactor equipped with an innovative and specific back pressure system to adjust the dryness.
FILTRATION SCREEN
The bubbles formed by air insufflation ensure the separation of the fat by flotation and separate the organic materials stuck to the sand. The sand and fat removing tank are designed with modules of identical lengths. This modularity offers great flexibility. It is thus possible to vary, at the origin or later on, the length of the tank to adapt to the desired hydraulic speeds.
FAT EXTRACTION
The extraction of fat takes place over the entire length of the machine by means of a longitudinal box. The accumulation of fat in this zone is favored by the movement created by the insufflation of air. The fat is recovered and evacuated by a surface scraper.
SAND EXTRACTION
The decanted sand is collected by a first horizontal screw installed at the bottom of the tank and is transferred to an extraction and draining screw for evacuation towards storage systems before final disposal.

MATERIALS

Construction in stainless steel 304L or 316L
Screw in special steel high resistance

APPLICATION of Compact Pretreatment Unit
The compact pretreatment unit EnviroPrep is designed for urban and industrial raw effluents. Such a simple and efficient solution fits perfectly with projects looking after minimizing the concrete and reducing the pretreatment operating costs of urban and industrial sewage treatment plants

SPECIFICITIES of Compact Pretreatment Unit