The Application of Membrane Technologies in Wastewater Re-use Mohamed Salah, P.Eng. Joint General Manager Water Technologist Larsen & Toubro Limited Waste Technology India Expo January 18-20, 2018

Presentation Outline Why Membranes for Re-use Membrane Types L&T’s International Re-use Experience Membranes Going Forward

Why Membranes for Reuse High quality treated effluent (BOD, COD, Turbidity, TP); High log removal of pathogens hence less disinfectants; Small footprint; Short construction schedule; Easy installation; Re-use: Irrigation, service water and process water.

Membrane Bioreactor (MBR) Membrane Types Membrane Bioreactor (MBR) Combination of secondary and tertiary; Submerged UF membranes; PVDF and PES; Hollow fibre or flat sheet; Smaller footprint and better quality than ASP.

……Membrane Bioreactor (MBR) Membrane Types ……Membrane Bioreactor (MBR) Bioreactor operates at MLSS of 8000-9000 mg/L; Flux rate 20-30 LMH at average flow and 40-50 LMH at peak; Air scouring and high recirculation rate required; BOD/NTU/TN of 5/0.2/10 respectively.

UF & MF Tertiary Filtration Process Application UF & MF Tertiary Filtration Post secondary treatment; Pressurized skid mounted membrane modules; Hollow fibre (inside out/outside in); PVDF, PES, and PVC; High flux rate 60-75 LMH; Smaller footprint and better effluent quality than sand or disc filters.

Process Application Reverse Osmosis (RO) Post tertiary treatment; Removal of dissolved solids; Two stage RO with high recovery; Mostly industrial process water applications such as boiler feed water etc.

L&T’s International Re-use Experience Particulars Details Client Public Works Authority of Qatar Project name Doha South STW EPC Contractor L&T Total plant capacity 241 MLD Secondary treatment Sequencing batch reactor (SBR) Tertiary treatment UF Re-use Irrigation Award MEED Quality Award 2017

L&T’s International Re-use Experience

Ultrafiltration Installation – Doha, Qatar

Membranes Going Forward Membranes capital cost is coming down: High demand in the Chinese market; Customer acceptance increased demand; Increase of vendor pool; Increase of application pool; Decrease in manufacturing cost; Various options of membrane materials.

Membranes Going Forward Improved operating cost: Vendors have confidence to guarantee up to 10 years; Reduced replacement cost; Decrease in chemical consumption; Optimization in backwash and air scouring; Improved life cycle cost; Better trained operators.

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