Cleaning reusable materials from street cleaning

At a waste disposal company sludge and residual from drains and sand separators are treated. Therefore the material is washed, separated into different groups and finally sold as reusable material.

The washing water from the plant is soiled with fine sand, organic particles and other dirt particles from the street. Approx. 80 m³ of washing water is used per hour.

Technical characteristics

Washing water rate ca. 80 m³/h
Clarifying area solids separator 20 m²
Minimum particle size ca. 60 µm (related to sand)
Lamella spacing 40 mm
Output conveyor screw 1,4 m³/h
Material housing / screw Coated steel / Hardox
Material lamellas Polypropylene
Clarifying area lamella separator 100 m²
Lamella spacing 40 mm
Material housing Coated steel
Material lamellas Polypropylene

A solids separator removes coarse materials (e.g. sand particles > 63 µm). The solids are exported by a screw. The separation rate is achieved by the effective surface. In this case approx. 20m² clarifying area is needed. Through the use of inclined lamellas the clarifying area can be increased from 7 to 20m² without changing the dimensions of the container. Thus, the costs can be reduced, less space is required and the effectiveness is increased. Also see functional description lamella separator.

The water flows into the solids separator and is transferred to the lamella separator. The purified water is collected in a pit and finally pumped back to the washing machine. The particles settle onto the lamellas and slide into the sludge funnel. A grabble rake is fitted to prevent caking of the sludge. The rake continuously stirs the sludge in the tip of the funnel. The sludge gets exported when a certain sludge level is reached which is monitored by a sludge probe. The sludge is dewatered by a belt filter press.

Solids separator / sand separator –everything's clear!

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