INDUSTRIAL WATER PRETREATMENT

Primary and Secondary Clarifiers

Primary treatment of industrial waste involves the removal of floating and suspended solids from wastewater providing a clarified liquid effluent for downstream treatment processes. IDE offers a variety of wastewater clarification technologies for primary and secondary treatment. Primary clarification removes solids prior to biological treatment. Secondary clarification follows the biological treatment process with the main goal of rapidly returning activated sludge.

DAF (Dissolved Air Flotation)

DAF technology is an efficient procedure for the separation of suspended matter (turbidity, algae etc.) and SDI from seawater. Dissolved air flotation (DAF) utilizes the property of micro-bubble adherence to suspended solids, increasing the tendency of the particles to float. These micro-bubbles attach themselves to discrete floc particles created in the flocculation process.

Thanks to air bubbles’ velocity under flow with aggregate density decreasing, aggregates will rise to  the water surface.  DAF enables efficient separation of suspended solids, and oil & grease traces, as well as reduction of organic load, and delivers significant cost savings (CAPEX), especially in small and medium plants.

UF (Ultrafiltration)

Ultrafiltration (UF) is a membrane filtration process similar to Reverse Osmosis, which uses hydrostatic pressure to force water through a semipermeable membrane. The pore size of the ultrafiltration membrane, usually 103 – 106 Daltons, creates a pressure-driven barrier to suspended solids, bacteria, viruses, endotoxins and other pathogens to produce water with very high purity and low silt density.

Filtration (Media filters)

A multi-media filter is used to reduce the level of suspended solids (turbidity) in process water. Suspended solids can consist of small particles such as silt, clay, grit, organic matter, larvae, zooplankton, algae and other microorganisms. The filtration degree of a multi-media filter depends heavily on the filter media and flow (velocity) through the filter. As particles become trapped in the media, the differential pressure across the bed increases.

GAC (Granular activated carbon)

Granular activated carbon (GAC) is a hybrid mixture of a wide variety of graphite platelets that are interconnected by non-graphitic carbon bonding. The adsorptive capacity of GAC makes it ideal for removing a variety of contaminants from water, air, liquids and gases.