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Green STP Technology

SBR — The Proven Performer — Batch-Perfect Biology

India's most specified decentralized STP technology. The Sequencing Batch Reactor performs every treatment step — fill, aerate, settle, decant — inside a single PLC-controlled reactor, with naturally occurring bacteria doing 100% of the work. No coagulants. No chlorine dosing. No chemical storage. Just biology, air and gravity, engineered for guaranteed BOD <10 mg/L.

GS-10-SBR · GS-25-SBR · GS-50-SBR · GS-100-SBR — packaged and civil-tank configurations for residential, commercial, hospitality, healthcare and institutional projects.

Explore SBR Models Get SBR Quote
100% Chemical-FreeBOD <10 mg/L GuaranteedPLC Automation Standard10–100 KLD

Where SBR fits best

  • Residential complexes and townships from 10 to 100 KLD
  • Projects where consultant and SPCB familiarity speeds approvals
  • Highly variable occupancy — hotels, malls, temples, campuses
  • Sites needing nitrogen removal without a separate anoxic tank

Consider another technology when

  • Sites with no reliable power backup — batch cycles need continuity
  • Projects requiring the absolute smallest footprint (see MBR)
  • Effluent needing direct cooling-tower makeup without polishing

How it works

Batch-Perfect Biology — The Smartest Way to Treat Sewage

The SBR is a fill-and-draw variant of the activated sludge process — the world's most proven biological wastewater treatment method. Unlike continuous-flow systems that need separate tanks for aeration, clarification and sludge handling, the SBR performs ALL treatment steps in a SINGLE reactor through time-sequenced phases controlled by a PLC. Think of it as a smart washing machine for sewage — fill, wash, rinse, drain, repeat.

What happens · 60–120 min

1. Fill (Anoxic + Aerobic)

Raw sewage enters the reactor. An initial anoxic period (no air) promotes denitrification — bacteria convert nitrate to nitrogen gas, removing nitrogen. Then aeration begins.

Why it matters

Achieves nitrogen removal without additional chemicals. The 'green' advantage — biology does the work.

Process flow diagram

SBR — end-to-end treatment train

Every unit operation from raw sewage to reuse-grade water, including pre-treatment and the sludge branch.

SBR Process Flow Diagram

Single-tank, five-phase batch treatment. Fill, react, settle, decant and idle all happen in the same reactor — no separate clarifier, no return sludge pumping.

1Raw Sewage200–350 mg/L BOD
2Bar ScreenCoarse + fine solids
3Oil & Grease TrapSkimmer, FOG removal
4Equalisation Tank8–12 hr buffer + air mixing
5SBR ReactorFill → React → Settle → Decant
6DecanterFloating weir, clear supernatant
7PSF + ACFPressure sand & carbon
8UV / ChlorinationDisinfection, FC <100
9Treated Water TankFlushing • Landscape • Cooling

Sludge branch — from SBR Reactor

1Sludge HoldingAerobic digestion
2DewateringFilter press / drying bed
3Soil ConditionerChemical-free bio-sludge
InletPre-treatmentBiological corePolishingReuseSludge

Why SBR?

Eight reasons consultants specify SBR

Engineering advantages that show up in your compliance record, your energy bill and your maintenance calendar.

Proven Technology, Massive Track Record

SBR is the most widely installed decentralized STP technology in India — 1,600+ installations across 20+ countries for reference platforms. You choose certainty, not an experiment.

100% Chemical-Free Biological Treatment

Naturally occurring bacteria do ALL the treatment work. No coagulants, flocculants or chlorine. No chemical storage, cost or hazard — just biology, air and gravity.

Excellent Nutrient Removal

The programmable cycle runs anoxic and aerobic phases in the SAME reactor, achieving biological denitrification without a separate anoxic tank or added chemicals.

Handles Variable Loads Brilliantly

Weekday/weekend swings, holidays, hotel occupancy dips — batch operation absorbs them. The PLC adjusts cycle timing so quality stays constant at 40% or 100% load.

Perfect Quiescent Settling

Unlike continuous-flow clarifiers where water is always moving, SBR stops everything during Settle. Zero flow, zero disturbance, lowest achievable TSS by gravity.

Single-Tank Process — Smaller Footprint

Equalization, aeration, clarification and sludge holding combine in one reactor. No primary or secondary clarifier, no RAS pumps. Fewer tanks, less space, lower civil cost.

PLC Automation — Minimal Operator Dependency

Every Green STP SBR ships with PLC automation as standard. Fill, aerate, settle, decant and sludge wasting run 24/7 automatically. The operator supervises, not controls.

Future-Proof Performance

Designed to the strictest current Indian norms. When standards tighten, the cycle can be re-programmed to extend aeration or add phases — no structural modification.

Compare all 5 technologies

Performance guarantee

We don't just promise — we prove

Every installation is validated by an independent NABL-accredited laboratory. Three consecutive daily samples at full load, compared against the guarantee, before handover.

ParameterTypical Indian InletGreen STP OutletCPCB NormMargin of Safety
BOD (mg/L)200–350<10≤10Meets or exceeds
COD (mg/L)400–700<50≤50Meets or exceeds
TSS (mg/L)200–400<20≤20Meets or exceeds
pH6.5–8.06.5–8.56.5–9.0Well within range
Ammoniacal Nitrogen (mg/L)25–50<5≤5 (emerging)Exceeds current requirement
Total Nitrogen (mg/L)40–70<10≤10 (emerging)Proactive compliance
Fecal Coliform (MPN/100mL)10⁶ – 10⁸<100<100UV disinfection standard
Oil & Grease (mg/L)20–50<5≤10Exceeds with oil trap
BOD Removal Efficiency—>95%—Consistent >95%

Guarantee conditions: inlet must be domestic sewage within the design basis (BOD 200–350 mg/L, no industrial or toxic discharge); adequate power supply maintained; preventive maintenance per the Sarvo O&M manual followed; the plant not operated above rated capacity.

Reuse applications: Toilet flushing (direct) · Landscape irrigation · Vehicle washing · Floor washing · Road dust suppression · Construction curing · Firefighting reserve. For cooling tower makeup and premium reuse, add post-treatment (sand filter + activated carbon or UF).

Download Datasheet

Model lineup

Four SBR capacities, one engineering standard

Every model carries the same effluent guarantee. What changes is capacity, configuration and redundancy.

GS-10-SBR

The Compact Starter

10 KLD
Serves
30–60 residential units
Configuration
FRP Packaged
Reactors
1 reactor
Footprint
3m × 2m × 2.5m
Power
1.5–2.5 kW
Delivery
2–3 weeks

Best for: Small apartments, boutique hotels, clinics, schools, hostels

Full specification
Rated Capacity
10 KLD
Tank Configuration
FRP Packaged (primary) / Civil (optional)
No. of SBR Reactors
1 (single reactor operation)
Equalization Tank Volume
5 m³ (12-hour buffer)
SBR Reactor Volume
6 m³ effective
Hydraulic Retention Time
14.4 hrs
MLSS
3,000–4,000 mg/L
Sludge Retention Time
18–22 days
Dissolved Oxygen
2.0–4.0 mg/L
Cycles per Day
4 (PLC-controlled)
Aeration
1 × Roots blower, 1.5–2.2 kW
Specific Energy
0.8–1.2 kWh/KL
Delivery
2–3 weeks ex-factory
Get quote for GS-10-SBR

GS-25-SBR

The Flagship Performer

25 KLD
Serves
80–200 residential units
Configuration
Civil / MS Tank
Reactors
2 parallel reactors
Footprint
8m × 5m plot
Power
5–8 kW
Delivery
8–12 weeks

Best for: Mid apartments, hotels (50–150 rooms), hospitals, IT campuses

Full specification
Rated Capacity
25 KLD
Tank Configuration
Civil Tank (primary) / MS Fabricated
No. of SBR Reactors
2 (parallel alternating)
Equalization Tank Volume
12.5 m³
SBR Reactor Volume
2 × 7.5 m³ (15 m³ total)
Hydraulic Retention Time
14.4 hrs each reactor
MLSS
3,500–4,500 mg/L
Sludge Retention Time
20–25 days
Dissolved Oxygen
2.0–4.0 mg/L
Cycles per Day
6 per reactor (12 total)
Aeration
2 × Roots blower, 3.7 kW (1W + 1S)
Specific Energy
0.8–1.2 kWh/KL
Delivery
8–12 weeks incl. civil works
Get quote for GS-25-SBR

GS-50-SBR

The Mid-Scale Workhorse

50 KLD
Serves
200–400 residential units
Configuration
Civil Tank (RCC)
Reactors
2 parallel reactors
Footprint
12m × 7m plot
Power
8–12 kW
Delivery
10–14 weeks

Best for: Large apartments, large hotels, hospital & education campuses

Full specification
Rated Capacity
50 KLD
Tank Configuration
Civil Tank (RCC)
No. of SBR Reactors
2 (parallel alternating)
Equalization Tank Volume
25 m³
SBR Reactor Volume
2 × 15 m³ (30 m³ total)
Hydraulic Retention Time
14.4 hrs
MLSS
3,500–4,500 mg/L
Sludge Retention Time
20–25 days
Dissolved Oxygen
2.0–4.0 mg/L
Cycles per Day
6 per reactor
Aeration
2 × Roots blower, 5.5 kW (1W + 1S)
Specific Energy
0.8–1.0 kWh/KL
Delivery
10–14 weeks
Get quote for GS-50-SBR

GS-100-SBR

Township & Campus Grade

100 KLD
Serves
500+ residential units
Configuration
Civil Tank (RCC)
Reactors
2–3 reactors, N+1
Footprint
18m × 10m plot
Power
15–25 kW
Delivery
14–18 weeks

Best for: Townships, large campuses, mixed-use developments, SCADA projects

Full specification
Rated Capacity
100 KLD
Tank Configuration
Civil Tank (RCC)
No. of SBR Reactors
2–3 with N+1 redundancy
Total Reactor Volume
60 m³
Hydraulic Retention Time
14.4 hrs
MLSS
3,500–4,500 mg/L
Sludge Retention Time
20–25 days
Cycles per Day
6 per reactor
Aeration
2 × 11 kW Roots blowers + 1 standby
Specific Energy
0.7–1.0 kWh/KL
Automation
PLC + SCADA-ready, Smart+ standard
Delivery
14–18 weeks
Get quote for GS-100-SBR

Not sure which capacity fits your building?

Size it in 60 seconds with the calculator

SBR range — quick comparison

ParameterGS-10-SBRGS-25-SBRGS-50-SBRGS-100-SBR
Rated Capacity10 KLD25 KLD50 KLD100 KLD
Serves (residential)30–60 units80–200 units200–400 units500+ units
ConfigurationFRP PackagedCivil / MS TankCivil TankCivil Tank
No. of Reactors1222–3
Total Reactor Volume6 m³15 m³30 m³60 m³
Blower Power1.5–2.2 kW3.7 kW × 25.5 kW × 211 kW × 2 + 1S
Total Connected Load1.5–2.5 kW5–8 kW8–12 kW15–25 kW
Specific Energy0.8–1.2 kWh/KL0.8–1.2 kWh/KL0.8–1.0 kWh/KL0.7–1.0 kWh/KL
Footprint3m × 2m8m × 5m12m × 7m18m × 10m
Delivery Timeline2–3 weeks8–12 weeks10–14 weeks14–18 weeks
Digital TiersBasic / SmartBasic / Smart / Smart+Smart / Smart+Smart+ (standard)

Application guide

Who is this for?

Select your building type to highlight the recommended model above.

ApplicationTypical GenerationRecommended ModelKey ConsiderationDigital Tier
Apartments (30–60 units)8–12 KLDGS-10-SBRCompact FRP packaged — fits a utility room or small plotBasic / Smart
Apartments (80–200 units)20–30 KLDGS-25-SBRFlagship model. Twin reactors for 24/7 acceptance. Most popular.Smart (recommended)
Apartments (200–400 units)40–60 KLDGS-50-SBRFull redundancy. Smart tier standard. Large community confidence.Smart
Large Townships (500+ units)80–120 KLDGS-100-SBRMulti-reactor with N+1 redundancy. SCADA-ready.Smart+
Budget Hotels (30–80 rooms)8–15 KLDGS-10-SBRQuiet operation. Compact FRP fits basement/terrace.Basic
Premium Hotels (80–200 rooms)20–40 KLDGS-25-SBRWater reuse for landscaping + flushing = direct cost saving.Smart
Hospitals (50–200 beds)15–30 KLDGS-25-SBRAdd UV for pathogen kill. Consider MBR for high-risk waste.Smart
Schools / Colleges5–15 KLDGS-10-SBRSeasonal load variation. Low OPEX. Green campus branding.Basic
IT Parks / Offices15–50 KLDGS-25 / GS-50-SBRIGBC green credits. Reuse for flushing + cooling. ESG dashboard.Smart+
Shopping Malls20–40 KLDGS-25-SBRVariable weekend/weekday flow — SBR handles this perfectly.Smart
Railway Stations / Bus Depots15–50 KLDGS-25 / GS-50-SBRHigh variability. Vandal-proof panel. Remote-monitored.Smart
Religious Institutions / Temples5–25 KLD (10× festival peak)GS-10 / GS-25-SBRExtreme occupancy variation — batch flexibility is ideal.Basic
Which model fits your project? Run the calculator

Equipment & automation

Everything in the scope, specified and warranted by Sarvo

Single-source accountability — every component is specified, procured, factory-tested and warranted by us.

Download full technical specification

The economics

Your STP pays for itself

Water savings + zero chemical cost + compliance. Move the sliders to see the indicative picture for your project.

Treated water reused
6,800 KL/yr
Annual water savings
INR 54,40,000
Annual STP OPEX
INR 1,61,500
Net annual benefit
INR 52,78,500
Simple payback0.4 yrs

Indicative only — based on 340 operating days, catalogue OPEX bands and typical reuse fractions for SBR. A site survey produces the binding number.

Run the full 5-step calculator
Cost / Saving ElementGS-10-SBRGS-25-SBRGS-50-SBRGS-100-SBR
Indicative CAPEX (INR Lakhs)8–1418–2830–4855–85
Annual Electricity Cost (INR)36,000–54,00084,000–1,08,0001,44,000–2,16,0002,52,000–3,60,000
Annual Chemical CostZEROZEROZEROZERO
Annual Operator Cost (part-time)NIL–36,00060,000–1,20,0001,20,000–1,80,0001,80,000–2,40,000
Total Annual OPEX (INR)36,000–90,0001,44,000–2,28,0002,64,000–3,96,0004,32,000–6,00,000
OPEX per KL Treated (INR)10–2516–2514–2212–16
Annual Water Savings* (INR)2,40,000–4,00,0006,00,000–10,00,00012,00,000–20,00,00024,00,000–40,00,000
Net Annual Benefit (INR)1,50,000–3,10,0003,72,000–7,72,0008,04,000–16,04,00018,00,000–34,00,000
Simple Payback Period3–5 years2.5–4 years2–3 years2–3 years

*Water savings assume 80% of treated water reused for toilet flushing and landscaping, replacing tanker water at INR 800/KL — conservative; many cities see INR 1,000–1,500/KL.

Project references

SBR plants delivered across India

Installed SBR references with capacity, scope of supply and measured outcome.

25 KLD2023

180-unit residential enclave

Bengaluru, Karnataka · Residential

Scope
Design, supply, erection, commissioning + 3-year comprehensive AMC
Outcome
Tanker spend down 72%; zero odour complaints from month one
Reuse
Flushing + landscape irrigation
40 KLD2023

120-room business hotel

Pune, Maharashtra · Hospitality

Scope
Retrofit of failed chemical-dosing plant, PLC upgrade, UV polishing
Outcome
CTO renewed on first inspection; stable output at 35–100% occupancy
Reuse
Flushing + cooling tower makeup
60 KLD2024

Multi-block educational campus

Hyderabad, Telangana · Institutional

Scope
Two-reactor SBR with IoT Smart+ tier and remote operator support
Outcome
0.9 kWh/KL energy, 99.2% uptime, two-person facility team
Reuse
Sports-field irrigation
All Sarvo project references

Proof in the field

SBR projects and outcomes

Representative project profiles from the Sarvo reference framework — indicative of typical outcomes at these capacities.

Bengaluru, Karnataka

SBR retrofit at a 180-unit residential complex

Capacity
25 KLD
Tanker spend cut
72%
Payback
3.2 years
“The odour complaints stopped in the first month. The tanker bill is what convinced the general body.”

— RWA Secretary

Pune, Maharashtra

SBR for a 120-room business hotel

Capacity
40 KLD
Reuse
Flushing + landscape
Compliance
CTO renewed
“Occupancy swings from 35% to full. The plant simply does not care — the report is the same.”

— Chief Engineer

Hyderabad, Telangana

SBR at a multi-block educational campus

Capacity
60 KLD
Energy
0.9 kWh/KL
Uptime
99.2%
“Remote monitoring means our facilities team of two can run the plant without a specialist.”

— Campus Facilities Head

Explore the other Green STP technologies

MBBR

The Resilient Workhorse — Biofilm That Bounces Back

View technology MBR

The Reuse Champion — Ultra-Clear Water, Smallest Footprint

View technology Decentralized

Treat Locally, Reuse Locally — Buried, Silent, Almost Invisible

View technology Constructed Wetland

Nature-Based Treatment — Near-Zero Energy, 25+ Year Life

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Ready for batch-perfect biology?

Get a site-specific design, a performance guarantee and indicative pricing — usually within three working days of the survey.

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