30 KLD STP SBR Price In Chennai
30 KLD Sewage Treatment Plant – SBR Technology | RRR Enviro Systems
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30 KLD Sewage Treatment Plant — SBR Technology

Compact Sequential Batch Reactor (SBR) system — batch operation provides excellent BOD/TSS removal, flexible operation for variable loads, low sludge and compact footprint. TNPCB/CPCB compliant design, turnkey supply & AMC available.

Quick Summary

Design capacity: 30 KLD (30 m³/day). Mode: SBR (Sequential Batch Reactor). Default design basis used: 20 operating hours/day, assumed influent BOD₅ = 250 mg/L. Final design and guarantees after site water analysis.

Process Flow (SBR Batch Sequence)

Inlet → Bar screen & Grit / Oil-Grease trap → Equalization / Buffer tank → SBR Reactor (Fill → React / Aeration → Settle → Decant → Idle) → Polishing (Sand / UF optional) → Disinfection (UV / Hypo) → Treated water tank → Reuse / Discharge. Sludge → Sludge sump → Thickening → Dewatering (drying bed or mechanical) → Disposal.

Design Basis & Digit-by-Digit Calculations

Assumptions used (default):
  • Daily flow Qday = 30.000 m³/day
  • Operating hours = 20 hr/day
  • SBR total cycle time (typical) = 6 hours (Fill 0.5h, React/Aeration 3.0h, Settle 1.5h, Decant 0.5h, Idle 0.5h) — adjustable
  • Target effluent BOD & TSS: < 30 mg/L (with polishing)

1) Hourly flow (digit-by-digit)

Qhr = Qday ÷ operating_hours = 30.000 ÷ 20 = 1.500 m³/hr.
Convert to LPH: 1.500 × 1000 = 1500 LPH.
Q_day = 30.000 m³/day → Q_hr = 30.000 ÷ 20 = 1.500 m³/hr → 1500 LPH

2) SBR Reactor Volume (based on cycle)

For SBR, reactor volume V required = Qhr × total_cycle_time (hr) × cycles_per_hour? Better: compute continuous equivalent: If total cycle is 6 hours, then each cycle treats Qhr × 6 m³ per cycle. Choose one reactor (single SBR) sized to hold that volume. V = Qhr × cycle_time = 1.500 × 6 = 9.000 m³ (9,000 L).
V_sbr = 1.500 × 6.0 = 9.000 m³ → 9,000 L
Note: For operational flexibility and maintenance we recommend using 2 smaller reactors (e.g., two SBR tanks each ~4.5 m³) or single larger with redundancy (N+1). Choose arrangement based on site layout.

3) Aeration (React) Volume & MLSS

React (aeration) phase chosen = 3.0 hours (of 6.0 hr cycle). Reactor aeration volume portion = Qhr × react_time = 1.500 × 3.0 = 4.5 m³ effectively in active aeration during react step (but entire SBR volume participates across cycle).
Assume MLSS (mixed liquor) target = 3,000 mg/L (3.0 kg/m³) typical for SBR with moderate load. Biomass mass = MLSS × V_sbr = 3.0 × 9.000 = 27.0 kg.
React_volume = 1.500 × 3.0 = 4.5 m³ (active aeration fraction) MLSS mass = 3.0 kg/m³ × 9.000 m³ = 27.0 kg

4) BOD load & oxygen demand

Assume influent BOD₅ = 250 mg/L → daily BOD load = Q_day × BOD ÷ 1000 = 30 × 250 ÷ 1000 = 7.5 kg BOD/day.
O₂ requirement estimate = 1.4 kg O₂ per kg BOD removed → O₂ ≈ 7.5 × 1.4 = 10.5 kg O₂/day. Convert to blower sizing (rough): if design OTR gives 0.9–1.5 kg O₂ per kW depending on diffuser/OEE; assume 1.2 kg O₂/kW → blower power ≈ 10.5 ÷ 1.2 ≈ 8.75 kW → round to 9 kW (consider duty+standby). (This is conservative; final blower sizing after OTR test.)
BOD_load = 30×250/1000 = 7.5 kg/day O2_req = 7.5×1.4 = 10.5 kg/day Blower_kW ≈ 10.5 ÷ 1.2 ≈ 8.75 kW → use 9 kW with redundancy

Important: blower sizing must be revised using diffuser OTR (oxygen transfer rate), site temperature, depth, and desired DO setpoint. For small plants often 2–4 kW blowers are used — here we used a conservative estimate for robust performance; we can optimize after influent & site data.

5) Settling & Decant

Settling time chosen = 1.5 hours per cycle. Decant volume typically 20–40% of reactor volume per cycle depending on decant fraction. With V = 9 m³ and decant fraction 33% → decant per cycle ≈ 9 × 0.33 = 2.97 m³ per cycle. Over full day cycles: number of cycles/day = operating_hours ÷ cycle_time = 20 ÷ 6 ≈ 3.333 cycles/day; daily decant volume = 2.97 × 3.333 ≈ 9.900 m³/day (≈ 30 m³/day) — consistent with flow.
Cycles/day = 20 ÷ 6 = 3.333 Decant_per_cycle ≈ 9 × 0.33 = 2.97 m³ Daily_decant = 2.97 × 3.333 = 9.9 m³/day ≈ 30 m³/day (matches daily flow)

6) Sludge generation (estimate)

Typical sludge yield ~ 0.5 kg dry solids per kg BOD removed → daily dry solids ≈ 7.5 × 0.5 = 3.75 kg DS/day. If dewatered to 3–5% cake solids, wet sludge ≈ DS ÷ solids_fraction ≈ 3.75 ÷ 0.03 ≈ 125 L/day (at 3% solids) — provide sludge sump & drying bed or mechanical dewatering as per disposal plan.
Dry solids/day = 7.5×0.5 = 3.75 kg/day Wet sludge ≈ 3.75 ÷ 0.03 ≈ 125 L/day (at 3% solids)

All numeric values above are conservative working estimates. Final design and equipment sizing will be confirmed after receiving the raw influent lab report (BOD, COD, TSS, FOG, pH, temperature) and site constraints.

Main Components & Scope of Supply

  • Bar screen & grit / O&G removal chamber
  • Equalization / buffer tank with mixer & level control
  • SBR reactor tank(s) with inlet decant & internal baffles
  • Fine bubble diffusers or coarse depending on OTR need; blowers (duty + standby) with air distribution manifold
  • RAS / sludge return and sludge sump with pump
  • Decanter / decant arrangement (submersible decant or dedicated decant weir)
  • Polishing filters (PSF / Cartridge / UF optional) and disinfection (UV / NaOCl dosing)
  • Sludge drying bed or mechanical dewatering (if required)
  • PLC control panel with timer logic for SBR cycles, level sensors, DO sensors, flow meter
  • Piping, valves, supports, civil works, installation & commissioning

Expected Performance & Uses

ParameterTypical InfluentExpected Effluent (SBR + Polishing)
BOD₅200 – 400 mg/L< 20 – 30 mg/L (good operation)
TSS150 – 350 mg/L< 30 – 50 mg/L
COD600 – 1200 mg/L< 150 – 300 mg/L (varies)
TurbidityVaries< 5 NTU (with polishing)
pH6.5 – 8.56.5 – 8.5

SBR is flexible for variable loads and intermittent operation; suitable for apartments, hostels, schools, hospitals, small industries. For high reuse quality (toilet flushing / cooling) add UF/RO and disinfection as needed.

Operation & Maintenance

  • Daily: check inlet screens, pumps, blower status, DO & pH, cycle timers, decant function.
  • Weekly: inspect diffusers, check sludge blanket in decanter, clean grit & O&G traps.
  • Monthly: calibrate sensors, check blower belts/bearings, verify PLC timers & sequence.
  • Periodic: sludge dewatering schedule, diffuser replacement if fouled, media inspection (if provided).
  • Provide operator training, spares list and AMC options for stable performance.

FAQ — 30 KLD SBR STP

Q1: What is SBR and why use it?

SBR (Sequencing Batch Reactor) is a fill–react–settle–decant batch process in a single tank. Benefits: compact footprint, flexible operation, easy modification of cycle times for varying loads, and often lower sludge production.

Q2: How many cycles per day will this plant run?

With a 6-hour cycle and 20 operational hours, cycles/day ≈ 20 ÷ 6 ≈ 3.33 cycles/day. You can change cycle time as per site needs (shorter cycles => more frequent decanting).

Q3: What reports are required to finalise design?

Send raw influent lab report: BOD, COD, TSS, TDS, Turbidity, FOG, pH, temperature and any industrial contaminants. We also offer on-site jar tests and SDI/OTR tests.

Q4: Do you provide AMC & training?

Yes — we provide commissioning, start-up support, operator training and AMC packages nationwide.

RRR ENVIRO SYSTEMS · 30 KLD SBR STP · Est. 2011 · ISO 9001:2015

Contact: +91 97100 35249 (Sales/Technical) • +91 99623 95875 (Service) • rrrenviro@gmail.com