Water Reclamation
1. Turnkey Construction of Water Reusing & Recycling Plants
In Sri Lanka's competitive industrial sector—including textile finishing, food and beverage manufacturing, pharmaceuticals, commercial laundries, rubber processing, and hotel resorts—water purchase costs and municipal sewer discharge fees are escalating rapidly. Water Lanka Services designs, constructs, and commissions turnkey Wastewater Recycling and Effluent Reclaim Plants that convert hazardous or secondary treated effluent into high-purity, usable process water.
- 70% – 90% Fresh Water Recovery: Dramatically reduce raw water withdrawal from deep tube wells or municipal mains by circulating treated water back into the manufacturing cycle.
- Zero Liquid Discharge (ZLD) Compatibility: Advanced multi-stage membrane concentration and thermal evaporator skids engineered for facilities situated in environmentally sensitive zones where zero wastewater discharge is mandated by the Central Environmental Authority (CEA).
- Full Civil & Mechanical EPC: We handle complete on-site reinforced concrete civil works, piping headers, skid fabrication, electrical switchgear, and PLC controls.
Multi-Barrier Engineering
2. Multi-Barrier Tertiary Treatment Architecture
Treating secondary biological wastewater to reusable industrial grade requires a multi-barrier treatment train that prevents bio-fouling, removes colloidal organics, and eliminates dissolved mineral salts.
- Coagulation & Multi-Media Filtration: Flash mixing with Polyaluminium Chloride (PAC) followed by high-rate dual-media pressure filters (anthracite + quartz sand) to eliminate suspended solids and reduce Silt Density Index (SDI < 5).
- Granular Activated Carbon (GAC): High iodine virgin activated carbon adsorbers to remove residual Chemical Oxygen Demand (COD), color, surfactants, and oxidizing chlorine.
- Ultrafiltration (UF) Membrane Barrier: Pressurized hollow-fiber PVDF membranes with 0.02-micron pore rating, rejecting 99.999% of bacteria, suspended colloids, and pathogens, ensuring SDI < 2.5 feed to downstream RO.
- Secondary Brackish Water Reverse Osmosis (BWRO): High-pressure polyamide thin-film composite membranes designed to operate on wastewater feed, rejecting 99.2% of dissolved salts, silica, and heavy metals.
- Advanced Disinfection: Closed-chamber Ultraviolet (UV) reactors and Ozone generators providing instant microbial sterilization without chemical residuals.
Practical Applications for Recycled Water in Sri Lankan Industries
Depending on water quality requirements, Water Lanka configures water reuse plants for specific operational needs across Sri Lanka:
Cooling Tower Makeup
RO-reclaimed water is free of scaling calcium, magnesium, and silica, dramatically increasing cooling tower concentration cycles, reducing blowdown volume, and slashing biocide chemical costs.
Boiler Feed Water
Polished permeate water with electrical conductivity < 20 µS/cm and zero hardness protects industrial steam boilers and economizers from heat-insulating scale deposits and tube burnouts.
Commercial Toilet Flush
Hotels, shopping complexes, and office towers reuse disinfected tertiary effluent through dedicated dual-piping networks for toilet and urinal flushing, saving up to 45% of total potable water usage.
Irrigation & Washing
Nutrient-balanced treated effluent provides free, eco-friendly irrigation for hotel gardens, golf courses, and sports grounds, as well as vehicle washing, crate cleaning, and factory floor washdown.
Smart Automation & Controls
3. Modern PLC, Touchscreen HMI & SCADA Automation
Modern water reuse plants operate complex multi-stage cycles—chemical conditioning, backwashing, chemical enhanced backwashing (CEB), CIP cleaning, and variable recovery throttling—that cannot rely on manual labor. Water Lanka integrates state-of-the-art industrial automation:
- Industrial PLC Core: Programmed with Siemens SIMATIC S7-1200/1500, Schneider Electric Modicon, or Delta PLCs with modular I/O, fail-safe interlocks, and automated sequencing.
- Color Touchscreen HMI Displays: Siemens SIMATIC Comfort and Weintek 7" to 15" high-resolution touchscreens featuring live animated P&ID schematics, pump run-hour logs, automatic/manual overrides, and fault diagnostics.
- Closed-Loop Sensor Instrumentation: Real-time feedback from digital inline pH/ORP sensors, Optical Dissolved Oxygen (DO) probes, electromagnetic flow meters, differential pressure transmitters, and permeate conductivity monitors.
- Variable Frequency Drives (VFDs): Inverter-driven high-pressure feed pumps and air blowers modulate motor speeds based on real-time membrane pressure and flow demand, saving 25% to 35% on electrical energy.
- IoT Remote Cloud Telemetry: Optional GSM/Ethernet gateways provide mobile dashboards, weekly compliance reporting, and instant WhatsApp/SMS alarm alerts to plant engineers.
Treated Recycled Water Parameters vs. Sri Lanka Standards
| Water Parameter |
Raw Wastewater Effluent |
CEA Inland Discharge Limit |
Water Lanka Recycled Reclaim Water |
Ideal Reuse Application |
| pH |
4.5 – 10.5 |
6.0 – 8.5 |
6.8 – 7.5 |
Cooling Towers, Boiler, Flushing |
| BOD5 (mg/L) |
300 – 1,500 |
< 30 mg/L |
< 2 mg/L (ND) |
Universal Industrial Reclaim |
| COD (mg/L) |
800 – 4,000 |
< 250 mg/L |
< 10 mg/L |
Process Washing & Rinsing |
| Total Suspended Solids (TSS) |
200 – 800 mg/L |
< 50 mg/L |
< 1 mg/L (Turbidity < 0.2 NTU) |
Membrane & RO Feed |
| Total Dissolved Solids (TDS) |
1,200 – 3,500 mg/L |
< 2,100 mg/L |
< 50 mg/L |
Boiler Feed & Cooling Towers |
| Total Hardness (as CaCO3) |
250 – 600 mg/L |
No limit |
< 5 mg/L (Zero Hardness) |
Scale-Free Heat Exchangers |
| E. Coli / Coliforms |
10^6 – 10^8 MPN/100ml |
< 40 MPN/100ml |
0 MPN/100ml (Sterile) |
Toilet Flush, Landscaping, Turf |
How much money can a factory save by installing a water recycling plant in Sri Lanka?
Industrial facilities purchasing commercial bowser water or paying high NWSDB industrial water tariffs (often LKR 200–400 per cubic meter) typically achieve full payback on a Water Lanka water recycling plant within 14 to 24 months. Reclaiming 100 m³/day saves an estimated LKR 600,000 to LKR 1,200,000 every month in raw water purchases and effluent disposal fees.
Is recycled wastewater safe for toilet flushing and hotel landscaping?
Yes. Our multi-stage tertiary systems utilize 0.02-micron Ultrafiltration (UF) and UV/Ozone disinfection, completely eliminating 100% of odor, color, pathogens, and suspended particles. The treated water is crystal clear, safe for human contact, and fully compliant with Central Environmental Authority (CEA) reuse guidelines.
Can existing wastewater plants in Sri Lanka be retrofitted for water reuse?
Yes. Water Lanka specializes in retrofitting existing operational STPs, ETPs, or SBR plants by installing skid-mounted tertiary polishing modules (coagulant dosing, multi-media filtration, Ultrafiltration, and Brackish Water RO skids) without disrupting your ongoing factory operations.
What brands of PLC and HMI does Water Lanka use for plant automation?
We primarily engineer automation systems using world-renowned Siemens SIMATIC S7-1200 / S7-1500 PLCs, Schneider Electric Modicon, Delta, and Omron controllers, paired with high-resolution capacitive touchscreens from Siemens and Weintek for intuitive operation, real-time diagnostics, and remote cloud connectivity.