Two water loops in every thermal power plant
A thermal power plant runs two mission-critical water systems. Both degrade over plant life, and a failure in either cascades into compliance penalties, derating or forced outage.
The process loop (raw water → clarification → DM plant → boiler → turbine → condenser) produces the demineralised boiler feed water that protects boilers and turbines. The effluent loop (cooling-tower blowdown + DM regeneration waste + coal & ash water + service water) must be recovered to Zero Liquid Discharge so no liquid effluent crosses the plant boundary.
Boiler Feed Water Chain
Wastewater & Reuse
Five solutions across the plant water chain
SRPEPL covers the full TPP water envelope through five intervention points. Each can be delivered standalone or combined under EPC, retrofit, supply, O&M or AMC engagement models.
Membrane-first ZLD for thermal power plants
SRPEPL delivers TPP ZLD with a membrane-first architecture: recover the maximum water with membranes, and reserve thermal evaporation only for the irrecoverable brine. Streams are segregated, stabilised in pre-treatment, clarified through UF/MBR, bulk-desalinated through multi-stage RO, pushed further on high-pressure RO/DTRO for high-TDS and high-silica streams, and only then sent to MEE/MVR for final concentration. This makes ZLD a hydraulic problem rather than a thermal one — smaller evaporator duty, lower energy cost and more stable operation.
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Live EPC
300 m³/hr
| Plant | 2×660 MW supercritical |
| Scope | 300 m³/hr RO as part of ZLD package |
| Delivery | Complete EPC — design, supply, civil, E&C |
| Compliance | CEA ZLD norms, plant-effluent reuse |
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Operational
2.64 MLD
| Capacity | 2×110 m³/hr (~2.64 MLD) |
| Train | UF + RO + MVR + MEE + ATFD |
| Scope | SCADA, automation, reuse distribution |
| Post-build | O&M included |
Restore an ageing DM plant without rebuilding it
Over 10–15 years TDS rises, hardness creeps up and silica varies seasonally — so the resin treats less water per regeneration. SRPEPL's answer is a skid-mounted UF + RO pre-treatment retrofit installed ahead of the existing DM plant — the legacy assets stay, but the resin now sees a fraction of the original ionic load.
| Client | Rajasthan Rajya Vidyut Utpadan Nigam Ltd. (RVUNL) |
| UF installed | 60 nos. SRP ULTRAFLO — 75 m³/hr × 3 streams = 225 m³/hr |
| RO installed | 144 nos. SRP BW 8040 — 75 m³/hr feed × 3 streams |
| Delivery | EPC + SAC integration + 1-year O&M |
| Value | ₹12.87 Cr (incl. GST) |
| PO reference | RVUN/CE(TD)/SE(TD-II)/XEN(TD)/F./D988 dt. 16.08.2024 |
One-to-one UF & RO replacement — manufactured in India
SRPEPL manufactures UF, RO and MBR membrane elements in-house under Make-in-India and supplies them as OEM-agnostic, dimensionally compatible, fully test-certified one-to-one replacements. Each element ships with a flow, integrity, dimensional and permeability test certificate — 100% of supplied elements — after an element-by-element performance audit.
HPGCL Khedar plant image
April 2026
24 UF Elements
| Scope | 24 nos. SRP ULTRAFLO 2000 UF elements |
| Spec | PVDF, 77 m² each, 2000 mm × 225 mm Ø |
| Commissioned | 27–28 April 2026 (two-day installation) |
| Outlet TSS | 0.3 ppm — all parameters within spec |
| Tender ref. | NIT 571/RGTPP/MM-I/TOE-13244 dt. 19.03.2025 |
One partner operates both water loops — performance liability on SRPEPL
SRPEPL runs multi-year O&M across the full TPP water envelope — process water and wastewater under a single operator. The plant focuses on generation; SRPEPL holds the water performance liability. Contracts cover trained manpower, chemicals & consumables, mechanical & instrumentation spares, defined KPIs with monthly MIS, and documented EHS and PSU audit support.
Membrane-based boiler feed water — no chemical regeneration
Why choose SRPEPL for thermal power plant water?
How a power plant can engage SRPEPL
Frequently asked questions
Thermal power plants in India are required to operate on a Zero Liquid Discharge basis under Central Electricity Authority (CEA) norms — no liquid effluent crosses the plant boundary. Streams that must be recovered include cooling-tower blowdown, DM-plant regeneration waste, coal-handling and ash water, and service water. SRPEPL delivers CEA-compliant ZLD using a membrane-first architecture.
A membrane-first ZLD recovers most of the water with UF, RO and high-pressure RO before any stream reaches the evaporator, so the MEE/MVR sees only the irrecoverable brine. This cuts the evaporator's size and steam/power consumption sharply, controls scaling species upstream, and turns ZLD into a more predictable hydraulic problem. Evaporator-led ZLDs carry high capital intensity and unstable OPEX.
Yes. Installing a skid-mounted UF + RO pre-treatment ahead of the existing DM plant removes 97–99% of the ionic load before water reaches the resin, so regeneration frequency, acid/caustic consumption and end-of-run sodium/silica slip all fall — without replacing the DM assets or taking a long outage. SRPEPL executed exactly this at RVUNL's Chhabra 2×660 MW supercritical plant (commissioned December 2025, completion-certified March 2026).
Yes. SRPEPL manufactures UF (SRP ULTRAFLO), brackish-water RO (SRP BW), ultra-low-pressure RO (SRP ULP), seawater RO (SRP SW) and submerged MBR (SRP AEROFLO) elements at two units in India under Make-in-India. Each element ships with a 100% test certificate covering flow, integrity, dimensional and permeability checks. NSIC, MSME and MII certified, EIL enlisted Code S168.
SRP GREENSTEAM™ is a membrane-based boiler-feed-water system using RO followed by electrodeionisation (EDI) to replace resin demineralisation entirely. It produces ultra-pure BFW (typically <0.06 µS/cm and <5 ppb silica) suitable for supercritical (≥180 bar) operation, with zero chemical regeneration — which also removes the high-TDS DM-regen waste stream. RO + EDI is globally proven including Con Edison's ~1,530 m³/hr East River repowering.
Yes. SRPEPL offers multi-year O&M (3, 5 or 10 years) across process water and wastewater, with performance liability on SRPEPL — covering manpower, chemicals, spares, planned membrane top-up, KPI-based monthly MIS and PSU audit support. Current power-sector O&M includes the RVUNL Chhabra DMRO+UF complex and the SAIL Bokaro ZLD complex.
SRPEPL is enlisted with EIL under Code S168 and holds NSIC, MSME (UDYAM) and Make-in-India certifications, with ISO 9001:2015 and ISO 14001:2015 management systems. It has executed or is executing for HPGCL, RVUNL, SAIL, MRPL and CPCL.
Related solutions & pages
Get a treatment architecture for your plant's water envelope
Share your plant's water balance and stream analyses — cooling-tower blowdown, DM-regen waste, ash and service water, plus your BFW quality target — and our engineers will revert with a recommended architecture.