Membrane Bioreactor & Membrane Tertiary for Wastew ater Reuse - - PowerPoint PPT Presentation

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Membrane Bioreactor & Membrane Tertiary for Wastew ater Reuse - - PowerPoint PPT Presentation

Mar 29, 2023 175 likes •354 views

Membrane Bioreactor & Membrane Tertiary for Wastew ater Reuse Mohamed Salah, P.E. Joint General Manager & Water Technologist Larsen & Toubro Limited 3 rd World Water Summit August 21 23, 2019 Water & Effluent Treatment IC

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Water & Effluent Treatment IC

Sensitivity: LNT Construction Internal Use

Membrane Bioreactor & Membrane Tertiary for Wastew ater Reuse

Mohamed Salah, P.E.

Joint General Manager & Water Technologist Larsen & Toubro Limited

3rd World Water Summit August 21‐23, 2019

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Water & Effluent Treatment IC

Sensitivity: LNT Construction Internal Use

Presentation Outline

Title 22 Reuse Standard MBR Review L&T Reuse Experience MBR Going Forward

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Water & Effluent Treatment IC

Sensitivity: LNT Construction Internal Use

Motivational Quotes for Sewage Reuse

  • “No higher quality water should be used for a purpose that

can tolerate a lower grade” UN Council Resolution 1958;

  • “Water should not be judged by its history but its quality” Dr.

Lucs Van Vuuren, one of the pioneers of Windhoek Water Reclamation System in Namibia, Africa.

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Water & Effluent Treatment IC

Sensitivity: LNT Construction Internal Use

Title 22 Reuse Standard

  • Title 22 is globally recognized standard for reuse;
  • Have 40 specific uses for tertiary treated sewage, 24 for

secondary and 7 for un-disinfected secondary

  • Total coliform = 2.2 MPN/100 mL (average secondary and

tertiary treated sewage);

  • Total coliform = 23 MPN/100 mL (average for secondary);
  • Turbidity = 2 NTU for tertiary
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Water & Effluent Treatment IC

Sensitivity: LNT Construction Internal Use

Main MBR Drivers

Smaller footprint;

  • Less construction cost and time;
  • Less piping and utilities;
  • Reuse quality water without tertiary treatment;
  • Typical effluent:

BOD/TSS/NH3-N/TN/TP/Turbidity; 5/0/1/10/1/0.2 respectively.

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MBR Plant Flow Diagram – MLE Process

Air (Effluent) Permeated Water Reversing Pump Permeate / Backwash MBR Aerobic Tank WAS RAS( Internal Recycle) Anoxic Reactor Screened Influent Gravity Flow

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Water & Effluent Treatment IC

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Membrane Bioreactor (MBR) Technology

  • Combination of secondary and

tertiary treatment;

  • Submerged UF membranes;
  • Most vendors use PVDF;
  • Hollow fibre or flat sheet;
  • Smaller footprint and better

quality than ASP and SBR.

Membrane tank Biology 5 Q biomass feed 4 Q RAS 1 Q Permeate FIT

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Water & Effluent Treatment IC

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FiberCast MBR: Latest Arrival

Hollow Fibre Flat Plate FibrePlateTM

  • Hybrid of hollow fibre and flat sheet;
  • O.04 microns pore size
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MBR Process Parameters

  • Bioreactor operates at MLSS of

8000-9000 mg/L;

  • Flux rate 18-30 LMH at average

flow and 40-50 LMH at peak;

  • Air scouring (~0.1Nm3/m2 and

recirculation rate (4x) required;

  • Maintenance cleaning 7 days.

Recovery cleaning 90-180 day;

  • BOD/NTU/TN of 5/0.2/10

respectively.

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MBR vs ASP

Parameters ASP Process MBR/ Tertiary UF

w/o Tertiary with Tertiary GMF Solids (TSS)

mg/L

COD

mg/L

< 30

Ptot

mg/L (with simultaneous precipitation)

< 0.3 Microbiological quality

Excellent bathing water quality

MLSS g/L < 12 Specific Energy demand 0.4 – 0.9 (kWh/m3)

20 – 40 3 – 8

40 – 50 30 –40 1.0 – 2.0 0.3 – 0.5 poor bathing water quality < 4 < 4 0.2 – 0.4 0.4 – 0.8

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  • 600 MLD design capacity,

current operation is 500 MLD;

  • Treats most of Beijing western

urban area and some industrial contribution;

  • In operation since 2016;
  • Submerged hollow fibre MBR

from Memstar;

  • Membrane area 1,728,000 m2
  • The plant is completely

underground and inside building.

Huaifang MBR Plant in China

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Water & Effluent Treatment IC

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UF Tertiary Treatment

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UF Tertiary Plant by L&T – Doha, Qatar

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Water & Effluent Treatment IC

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MBR Technology Going Forward

MBR capital cost is coming down:

  • Became mainstream technology. Customer acceptance

increased demand;

  • Large scale (>500MLD) installations. Economy of scale;
  • High demand in the Chinese market;
  • Increased vendor pool;
  • More industrial applications where reuse is needed;
  • Decrease in manufacturing cost;
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Water & Effluent Treatment IC

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MBR Technology 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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Water & Effluent Treatment IC

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THANK YOU