Stream UF at WBPDCL: Thermal Power Water Treatment

Introduction

Thermal power plants rely heavily on large volumes of high-quality water for boiler feed preparation, cooling systems, and auxiliary plant operations. Raw water sources such as rivers often contain high turbidity, suspended solids, colloidal silica, and organic matter, making advanced pretreatment essential to protect downstream systems like RO membranes and DM plants.

At West Bengal Power Development Corporation Limited (WBPDCL), West Bengal, river water quality posed significant challenges for consistent RO operation. To ensure reliable pretreatment performance and long-term operational stability, WBPDCL partnered with Theway Membranes to implement Stream Ultrafiltration (UF) Membranes. This case study showcases the effectiveness and durability of Stream UF membranes in a demanding thermal power plant application.

The Challenge

River water used at WBPDCL is subject to wide seasonal and operational variations, creating several treatment challenges:

• Extremely High Turbidity & Suspended Solids: Feed water turbidity reached up to 90 NTU with TSS levels up to 60 ppm, increasing fouling risks.

• Colloidal Silica Presence: Fine colloidal particles threatened RO membrane integrity and performance.

• Organic Matter Load: Organics increased SDI values and fouling tendency.

• RO Protection Requirement: Consistent low SDI water was essential for reliable DM plant operation.

• Operational Cost Control: Frequent membrane replacement or excessive cleaning needed to be avoided.

The plant required a robust UF system capable of handling highly variable river water while delivering stable, high-quality permeate.

The Solution: Stream Ultrafiltration Membranes

After detailed technical evaluation, Stream UF Membranes from Theway Membranes were selected for their proven performance in high-turbidity surface water applications and thermal power plants.

Key Features of Stream UF Membranes

• Advanced Ultrafiltration Technology: Effective removal of suspended solids, colloidal silica, and organic matter.

• Ultra-Low Turbidity Permeate: Produces consistently high-quality water suitable for RO pretreatment.

• High Fouling Resistance: Designed to perform reliably under extreme turbidity fluctuations.

• Robust & Durable Design: Suitable for continuous power plant operations.

• Low Maintenance Requirement: Reduced cleaning frequency and extended membrane life.

  
  

Deployment at WBPDCL, West Bengal

The Stream UF system was commissioned in 2023 at WBPDCL as part of the DM plant pretreatment system, treating river water to protect downstream RO membranes. The system operates at an installed capacity of approximately 5.0 MLD.

Key Deployment Details

• Location: WBPDCL, West Bengal

• Industry Segment: Thermal Power Plant

• Technology: Stream – Ultrafiltration

• Source Water: River Water

• User Application: Pretreatment to RO in DM Plant

• Capacity: ~5.0 MLD

• Commissioning: 2023

Results and Impact

Field validation of Stream Ultrafiltration Membranes at WBPDCL demonstrated exceptional performance under challenging feed water conditions.

Key Results Achieved

• Consistent Permeate Quality:

  • Turbidity: < 0.1 NTU

  • Suspended Solids: < 1 ppm

  • SDI: < 3Achieved consistently over 9 months, even with feed turbidity up to 90 NTU, TSS up to 60 ppm, and SDI > 5.

• Stable RO Operation:High-quality UF permeate ensured reliable RO and DM plant performance.

• No Membrane Replacement:No UF module replacement required as of August 2024, confirming excellent membrane durability.

• Reduced Fouling & Maintenance:High resistance to fouling minimized cleaning cycles and operational interruptions.

• Operational Reliability:Consistent UF performance supported uninterrupted thermal power plant operations.

Conclusion

The successful implementation of Stream Ultrafiltration Membranes at WBPDCL, West Bengal demonstrates Theway Membranes’ ability to deliver robust and reliable filtration solutions for thermal power plant water treatment. The UF system effectively handled extreme turbidity, suspended solids, colloidal silica, and organic matter while consistently producing ultra-low turbidity permeate.

By adopting Stream UF technology, WBPDCL achieved improved RO pretreatment performance, extended membrane life, reduced operational costs, and enhanced system reliability—reinforcing the value of advanced ultrafiltration in power sector water management.

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