HUBER Coanda Grit Washer RoSF4

Grit separation, washing, dewatering in one system

HUBER Coanda Grit Washer RoSF4

– Reduced disposal costs
– Utilisation of the Coanda effect ensures high grit removal efficiency.
– Less than 3 % organic content
– High solids throughput
– More than 2,000 installations worldwide

The situation

Grit from grit traps of wastewater treatment plants
The grit contained in the wastewater is usually re moved in grit traps by gravity or centrifugal force to protect downstream equipment. Various different grit trap systems are available for this purpose which however separate not only the grit but frequently also many of the organic particles, dependent upon the hydraulic load
(inflow). The separated particles are then pumped from the grit trap to a grit classifying unit (screw or pilgrim step classifier) which remove the solids from the flow without any differentiation. As a result, the loss on ignition of the classified grit trap material varies from 10 % to 80 %depending on the screen bar spacing and inflow. The water content of the grit trap material is accordingly high (50 - 80 %).
The result are inevitably high costs for removal, transport and disposal, and in addition very bad hygienic conditions.

Grit from sewer systems, gully waste, road refuse
These raw materials are more or less contaminated with organics (sludge, leaves, etc.), but they contain also foreign matter that is similar to domestic waste (such as cans, screenings, stones, etc.), and a con siderable amount of water. Additionally, the indivi dual raw materials (grit, organics, foreign matter) vary seasonally so that their loss on ignition will range from 5 % to 80 %and their water content from 40 % to 90 %.
This results in inevitably high costs for dewatering, removal, transport and disposal.

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