Products

DAF unit

Flotation is a renowned method for separating suspended solids, oils and fat from waste water. EMI dissolved air flotation units were designed to perform the process in optimal conditions.

Raw waste water is mixed with precisely dosed chemicals in a pipe flocculator neatly composed with main unit or placed separately. Air dissolving happens in controlled
conditions within high-effciency saturation unit.


Water containing dissolved air is released in flotation chamber. As air travels upwards, it collects contaminants organized in floccs. Sludge separated from waste water is removed from upper surface with a skimmer. Sediments collected in specially shaped bottom section of flotation chamber are evacuated through pneumatic valves.

Since 1990 EMI has achieved excellent results in applying DAF units in food industry, but also in oil separation and general chemical pre-treatment.

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Description

Flow control

DAF units require stable flow for reliable operation. It is achieved through pumps controlled with inverters receiving signal from flowmeters. Steady flow is kept independently from retention tank level or current raw waste water flow. Maintenance is easier as fewer adjustments are required to maintain high treatment efficiency.

Lamella packs

Depending on waste water characteristics, EMI DAF units can be equipped with lamella packs which greatly reduce the footprint at the cost of slight increase in unit height. All lamella packs are made of stainless steel for reliability. Maintenance crews will appreciate the ability of removing single plates for cleaning and inspection.

Variable sludge hydration

Altering the hydration of flotation sludge in EMI units is done with a touch of a fnger on the control panel. Smart automatics take care of setting the right
operations mode for the skimmer.

Efficient saturation

EMI Airbox allows to set precise parameters for air pressure and volume. Saturation water is sourced from treated effluents and delivered with a separate pump.
Final dissolving happens in L-shaped saturation pipe. Saturate is fed into flotation chamber through a number of nozzles placed in carefully selected spots.

Multitude of variations

Each DAF unit is individually designed. Starting from a standard model, our designers
include case-specifc requirements and customizations. We can adjust dimensions
to ft close spaces, increase effluent or sludge compartments, and so on.
Hundreds of years of combined experience of our employees allow them to tailor
the solution to clients’ needs and expectations

EMI Smart Flow control

EMI offer a unique solution for applications with variating flow. Each of our DAF units can be equipped with an intelligent flow control system. When the operator adjusts the flow value, our smart automatics take care of all the rest to maintain treatment process most efficient. It will take care of changing the capacity of feeding pump, adjusting dosing of chemicals and even maintains same water level in the DAF unit. So next time you need to change the capacity of your DAF installation, it will take just one click.

Sediments screw conveyor

Some flotation applications are characterized by a big share of bottom sedimentation. Regular sediments removal systems may struggle in such cases. EMI proposes an integrated screw conveyor which offers supreme efficiency and capacity. Carefully selected seals make the conveyor water tight, so that the removed sediments are only moderately hydrated.

Various make options

In response to varying requirements of customers, EMI offers a multitude of make options. Starting with the material, ranging from standard AISI304 to special AISI904, through ATEX certifications to containerized solutions, EMI has an answer to almost every need.

Lamella cleaning

Lamella pack in EMI DAF units consists of a number of steel plates which are independently mounted inside of the unit. This gives the operator an ability to clean them one-by-one instead of handling a large and heavy pack. When removed, a single plate is fully accessible and it is very easy to clean it throughly without leaving any spots. A clean lamella pack enables best performance at lowest cost.

Cover

Every DAF unit can come equipped with a light cover which limits evaporation and the spread of odour. Each cover is designed to match ventilation system. We have also made sure that maintenance crews will find it easy to open the cover and access critical components.

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