1. 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

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

3. 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.

4. 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.

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

6. 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 LMH;
Smaller footprint and better effluent quality than sand or disc filters.

7. 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.

8. 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

9. L&T’s International Re-use Experience

10. Ultrafiltration Installation – Doha, Qatar

11. 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.

12. 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.

13. THANK YOU