Filtration Technologies Comparison for Tertiary Treatment

Contents Tertiary Treatment Definition Sand Filters Cloth Disc Filters Comparison table 06/11/2018

1 Tertiary Treatment Definition

Tertiary Treatment Definition Process used when water is to be used for irrigation, recreation, drinking water To better protect public health and environment Involves Specific processes Filtration Coagulation (iron / aluminium salts) Activated carbon adsorption Additional disinfection 06/11/2018

Tertiary Treatment Definition Involves a series of steps to further reduce organic concentration, turbidity, N, P, metals, and pathogens Filters Settling tank Disinfection tank (Sand, Discfilter…) Discharge to environment filters out protozoans & pathogenic bacteria 06/11/2018

Tertiary Treatment Definition Applications Remove Solids & Colloidal particles Filtration Chemical coagulation + settlers Remove Nutrients Nitrification Denitrification Phosphate Precipitation Remove Dissolved Solids Reverse Osmosis Electro-dialysis Kill Pathogens UV Disinfection Chlorination 06/11/2018

Middle East Wastewater Treatment Market Expected increase of Tertiary Treatment: Landscaping Cooling system Better discharged water quality Water reuse 06/11/2018

2 Sand Filters

Sand Filters Widely used and reliable technology Possibility of using Multi Media for better performances Choice of several technologies Gravity Filters Pressure Filters High efficiency in terms of Helming eggs and TSS removal 06/11/2018

Sand filter operation Filtration cycle: 06/11/2018

Sand filter operation Backwash cycle: 06/11/2018

Sand Filter Applications Downstream of conventional Biological Treatment Downstream of Biofilm System 06/11/2018

3 Cloth Disc Filters

Cloth Disc Filters Proven Technology Rotating Disc Type unit panels Around 820 references worldwide In operation since 1992 Rotating Disc Type unit panels Gravity System Continuous Filtration Compact Solution 70-80% smaller than Sand Filters 06/11/2018

Cloth Disc Filters 06/11/2018

Disc Filter Operation 06/11/2018

Disc Filters Features Simple design Sturdy Low foot print Simplicity Reliable, Minimization of mechanical and ancillary parts Sturdy Made of 304 or 316 stainless steel Low foot print • 70-80% smaller footprint than sand filters • Low install cost Simplicity • Installation, • Controls • Maintenance, • Operation Flexibility: • For corrosive environments, components • New Filtration target and increased Capacity can be achieved by simple changing or adding discs 06/11/2018

Disc Filters Applications Downstream of Conventional Biological Treatment Downstream of a Biofilm System 06/11/2018

Disc Filters Applications RBC and Disc Filter in same structure ActiDisk (Actiflo + Disc Filter) 06/11/2018

4 Comparison Tables

Main Advantages 06/11/2018

Performances comparison 06/11/2018

Carbon Foot Print comparison 06/11/2018

Conclusion Disc filter provides solution for most Tertiary Treatment Cases Disc Filter is better in terms of Foot print and Carbon foot print Disc Filter is cheaper by far in terms of CAPEX and OPEX compared to Sand filters Difficult to guarantee less than 5 mg/l SS with out Disk Filter 06/11/2018