300 KLD STP ASP price

Overview

This 300 KLD (300 m³/day) Activated Sludge Plant is engineered for continuous duty with focus on regulatory compliance (TNPCB / CPCB), low sludge yield and stable performance under variable loading. Default design assumptions used below: 20 operating hours/day, influent BOD₅ = 250 mg/L. Final guarantees provided after site survey & influent lab report.

Process Flow — Text Diagram

Inlet Sewage → Bar Screen → Grit & Oil-Grease Trap → Collection / Equalization Tank (with mixer) → Primary (Optional) → ASP Aeration Tank (diffused aeration) → Secondary Clarifier (settling & RAS) → Tertiary Polishing (PSF / ACF / UF) → Disinfection (UV / Hypochlorite) → Treated Water Tank → Reuse / Discharge (per TNPCB/CPCB). Sludge → Sludge Sump → Thickening → Dewatering (mechanical/drying beds) → Disposal.

Design Basis & Digit-by-Digit Calculations

Given / Assumed:

Design flow Q_day = 300 m³/day
Operating hours = 20 hr/day (used for hourly conversions)
Hourly flow Q_hr = 300 ÷ 20 = 15.00 m³/hr (15,000 LPH)
Design HRT (aeration) chosen = 6 hours (typical range 4–8 h for ASP)
Design MLSS = 3,000 mg/L (3.0 kg/m³) (typical)
Surface Overflow Rate (clarifier) = 30 m³/m²·day (typical)

1) Hourly Flow

Q_hr = 300 ÷ 20 = 15.00 m³/hr = 15,000 LPH.

Q_day = 300 m³/day → Q_hr = 300 ÷ 20 = 15.00 m³/hr → 15,000 LPH

2) Aeration Tank Volume (HRT method)

V_aer = Q_hr × HRT = 15.00 × 6 = 90.0 m³ (90,000 L). Include 15% freeboard → physical tank ≈ 103.5 m³.

V_aer = 15.00 × 6 = 90.0 m³ V_physical ≈ 90.0 × 1.15 = 103.5 m³

3) MLSS Mass

MLSS mass = MLSS × V = 3.0 kg/m³ × 90.0 m³ = 270 kg suspended solids in aeration tank (active biomass mass).

MLSS mass = 3.0 × 90.0 = 270 kg

4) Secondary Clarifier (SOR)

Area A = Q_day ÷ SOR = 300 ÷ 30 = 10.0 m² surface area required.
Circular clarifier diameter d = √(4A/π) = √(40/3.1416) ≈ 3.57 m → choose practical diameter 4.0 m (allow weir and maintenance). Depth and hopper shape designed per standards.

A = 300 ÷ 30 = 10.0 m² d ≈ sqrt(4×10 ÷ π) ≈ 3.57 m → choose ~4.0 m

5) BOD Load & Oxygen Requirement

Assume influent BOD₅ = 250 mg/L → daily BOD load = 300 × 250 ÷ 1000 = 75 kg BOD/day.
Oxygen demand (1.4 kg O₂/kg BOD removed) → O₂ ≈ 75 × 1.4 = 105 kg O₂/day.
Conservative blower sizing using 1.2 kg O₂/kW → blower power ≈ 105 ÷ 1.2 = 87.5 kW. Recommend multiple blowers (e.g., 3 × 30 kW duty/standby) and VFD control — final blower selection after OTR (oxygen transfer rate) and site-temperature corrections.

BOD_load = 300×250/1000 = 75 kg/day O2_req = 75×1.4 = 105 kg/day Blower_kW ≈ 105 ÷ 1.2 = 87.5 kW (use multiple units with redundancy)

Note: this is a conservative estimate. Real blower sizing should use diffuser OTR data, depth, temperature and DO setpoint — we will finalize after site details.

6) Sludge Generation (Estimate)

Sludge yield ~0.5 kg DS/kg BOD removed → dry solids/day ≈ 75 × 0.5 = 37.5 kg DS/day.
At 3% cake solids: wet sludge ≈ 37.5 ÷ 0.03 ≈ 1,250 L/day (1.25 m³/day). Provide sludge sump, thickening and dewatering (centrifuge / filter press or drying beds) sized accordingly.

Dry solids/day = 75 × 0.5 = 37.5 kg/day Wet sludge ≈ 37.5 ÷ 0.03 ≈ 1250 L/day (at 3% solids)

Main Components & Scope of Supply

Bar screen & comminutor (if required)
Grit & Oil-Grease removal chamber
Collection / Equalization tank with mixer and level instruments
Raw sewage transfer pumps (duty + standby)
Primary settling (if required), ASP Aeration Tank (90 m³ working) with fine-bubble diffusers
Blowers with air manifold (multiple units with VFD & redundancy)
Secondary Clarifier (4.0 m dia or multiple tanks)
Polishing: Pressure Sand Filter / Activated Carbon Filter / Cartridge Filters / UF optional
Disinfection: UV skid and / or Hypochlorite dosing system
Sludge handling: sludge sump, thickener, dewatering (filter press / decanter / drying beds)
Electrical & Control: PLC, MCC, level sensors, DO sensors, online TDS/SDI where needed
Piping (UPVC/HDPE/SS), valves, civil anchors, installation & commissioning

Regulatory Compliance — TNPCB / CPCB

Design will meet applicable TNPCB / CPCB discharge standards. Typical compliance measures included in scope:

Design to meet BOD, COD, TSS, Oil & Grease, and Faecal Coliform / E. coli limits as per notified standards (final limits depend on receiving body and reuse purpose).
Effluent monitoring points and sampling ports as per regulatory requirements.
Provision for treated effluent quality certificates, consent documentation support and statutory test assistance (upon request).
Provision for tertiary polishing and disinfection where reuse or stricter discharge limits are required.

We assist with permit paperwork and technical reports required for CPCB/TNPCB approvals (scope can be included in proposal).

Chemical Dosing & Utilities

Chlorine / Sodium Hypochlorite: Final disinfection dosing and break-point chlorination (dosing skid + storage + dosing pumps).
Polymer (Flocculant): Sludge dewatering & thickening aid (dosed to sludge sump or thickener).
pH correction: Acid / Alkali dosing for process control (if required for neutralization).
Anti-foaming agent: For aeration tanks if foam occurs.
Coagulant (Alum / PAC): For tertiary polishing if needed for TSS/colour removal.
Brine / chemical safe storage area with bunding and ventilation.

Chemical quantities and dosing rates calculated after influent analysis. We provide dosing skid, pumps, and safe storage as part of supply on request.

Technology Comparison (ASP vs MBBR vs SBR vs MBR)

Technology	Key Advantages	Best Use
ASP	Well-proven, simple operation, cost-effective for steady flows	Large municipal or continuous industrial flows where footprint available
MBBR	Smaller footprint, tolerant to shock loads, less sludge	Space-limited sites, variable load applications
SBR	Batch flexibility, compact, good control over cycles	Intermittent flows, small to medium communities, retrofit projects
MBR	Very high effluent quality, very low TSS, small footprint	Reuse critical projects, tight discharge limits, space constraint

Expected Performance & Reuse

Parameter	Typical Influent	Expected Effluent (After ASP + Polishing)
BOD₅	200 – 400 mg/L	< 30 mg/L (with tertiary polishing & good O&M)
TSS	150 – 350 mg/L	< 30 – 50 mg/L
COD	600 – 1200 mg/L	< 200 – 300 mg/L
Turbidity	Varies	< 5 NTU (with PSF / UF)
Use	—	Toilet flushing, landscaping, cooling towers (after disinfection and necessary polishing)

We provide performance guarantees only after acceptance of supply scope and review of water test reports (jar test & lab data).

Operation & Maintenance

Daily: inspect screens, pumps, blowers, DO (≥2 mg/L typical), sludge blanket, check alarms.
Weekly: clean scum & grit chambers; check blower & diffuser performance.
Monthly: calibrate DO & pH sensors, inspect clarifier weirs and desludge if needed.
Periodic: dewater sludge, service blowers, replenish chemicals and train operators.
We offer operator training, spares kit and AMC packages tailored to site requirements.

Item

Indicative Cost (INR)

Mechanical Equipment (pumps, blowers, diffusers)

₹ xx,xx,xxx

Civil & Tanks (RCC / FRP)

₹ xx,xx,xxx

Electrical & Control (PLC, sensors)

₹ xx,xx,xxx

Installation & Commissioning

₹ xx,xx,xxx

Sludge Dewatering Equipment

₹ xx,xx,xxx

GST

Extra

FAQ — 300 KLD STP (ASP)

Q1: How many users does a 300 KLD STP serve?

Assuming 100–150 L/person/day, 300 KLD can serve roughly 2,000–3,000 persons. Actual capacity depends on site-specific water consumption patterns.

Q2: What are the typical lead times?

Typical supply lead time for standard ASP equipment: 6–10 weeks. Civil works & installation vary by site; turnkey delivery normally 10–16 weeks depending on scope.

Q3: Do you provide statutory documentation & approvals support?

Yes — we assist in preparing technical documents for TNPCB / CPCB applications and provide performance test certificates after commissioning.

Q4: What test data do you need to finalise design?

Please share influent lab report: BOD, COD, TSS, TDS, FOG, pH, temperature, and any industrial contaminants. We offer jar tests and on-site analysis for accurate guarantees.