Dual Stage Screening
Peak factor 2.5×; automatic VFD level-based speed control; screenings logging; spare parts always stocked
Designed by Benchmark. Every Parameter. Every Unit Process.
GSI does not design by approximation. Every unit process — from dual-stage screening to high-recovery reverse osmosis and ZLD evaporation — is governed by documented internal engineering standards with defined benchmarks, evidence requirements, and operational rationale.
This is the technical foundation that determines whether a plant works consistently over 15 years or begins degrading before the first service contract expires. Poor design choices made at this stage create operational problems that no amount of good O&M can fully resolve. GSI's engineering team closes this gap before it opens.
Our process engineering is backed by 30+ years of operational data across 70+ active plants — including some of India's most complex industrial and municipal installations.
Key Deliverables
Equalisation & Cooling
6–24 hr HRT range; cooling tower mandatory when inlet >40°C; surface aerators with DO and temperature monitoring
Flash Mixer / Flocculator / Clarifier
G = 500–1500 s⁻¹ flash; 50–100 s⁻¹ floc; SOR ≤ 10 m³/m²·hr primary clarifier; 4-chemical dosing system
Anoxic Tank
DO < 0.2 mg/L strictly enforced; internal recycle 2–4× avg flow; mixing power 5–10 W/m³; no aeration in anoxic zone
Aeration Tank
MLSS 8,000–12,000 mg/L (MBR); fine bubble SOTE 20–35%; DO 2–4 mg/L with closed-loop VFD blower control
Membrane Bio Reactor (MBR)
Low flux PTFE membranes; design flux 12 LMH; TMP < 300 mBar; AI-ML predicted CIP scheduling
Ion Exchange & Degassing
Dual stage ion exchange; RO feed hardness reduced to zero; silica scaling prevention protocol
High Recovery Reverse Osmosis
RO feed pH raised above 9; ORP-controlled SMBS dosing; antiscalant 2–5 mg/L; 95%+ recovery target
Why It Matters
When People Get Clean Water, Everything Changes
When a facility treats and reuses its wastewater, the effect extends beyond the plant boundary. Manufacturers maintain production. Buildings reduce dependence on municipal supply. Industrial estates meet discharge obligations. The clean water question touches every sector. Access to clean water drives industry, commerce, and economies. GSI works across all of them.
Engineering That Holds Up. For 15 Years.
Start with a site assessment, we will tell you exactly what your project requires.