50 TPD working plant — 50,000 L/day · ~0.0204 cusec
Water treatment plants
Dirty sewage in. Safe water out.
This plant treats dirty sewage from houses, toilets and kitchens so the water is clean enough to discharge. Working duty is 50 tons per day — 50,000 litres, about 0.0204 cusec. Larger sites add the same train.
Five stages: take out big solids, balance the flow, let bacteria work, filter through an MBR, then chlorine dioxide. Some sludge is returned so the tanks keep their bacteria. One operator and two helpers. Civil: equalization tank, sludge tank, equipment pad and a small room.
- Capacity
- 50 TPD working plant — 50,000 L/day · ~0.0204 cusec
- Lead time
- 3–6 months
- Power
- 4.3 kW installed · 3 kW running · 10 kW, 415 V three-phase connection
Simple working
Simple working.
Screen → mix → anaerobic / anoxic / aerobic → MBR → chlorine dioxide → discharge.
01
Septic tank
Dirty water first sits in a septic tank. Heavy solids settle. Breakdown starts.
02
Grating screen
A metal screen takes plastic, cloth, food pieces and large solids so pumps and membranes do not choke.
03
Equalization tank
Tank is 2.5 m across and 6 m high. It mixes the sewage, steadies the flow and stops sudden load. Anaerobic bacteria are added here.
04
Three biological tanks
Anaerobic (no air) breaks big molecules. Anoxic (low air) takes nitrogen and ammonia. Aerobic contact oxidation — blowers, pipes, bio media — lets bacteria eat what is left. Low sludge. Easy to run.
05
Sludge recycle
Some sludge goes back to the earlier tanks so the plant keeps its bacteria and cleans better.
06
MBR then chlorine dioxide
Membrane bio-reactor filters bacteria, suspended solids and fines. Clear water goes to a disinfection tank. Chlorine dioxide kills bacteria and E. coli. Then the water is discharged.
- Duty
- 50 TPD · 50,000 L/day · 0.0204 cusec
- Power
- 4.3 kW in · 3 kW running
- Running cost
- ₹ 19.41 per 1,000 L
- People
- 1 operator · 2 helpers
- COD in / out
- 400 → ≤ 60 mg/L
- BOD in / out
- 250 → ≤ 20 mg/L
Duty and cost
50 tons a day. Same train, more sewage.
Working plant is 50 TPD — 50,000 litres a day, about 0.0204 cusec. Raise the flow and the same septic–A²O–MBR–chlorine dioxide line scales.
- Sewage in
- 50,000 L/day · 0.0204 cusec
- Installed power
- 4.3 kW · 3.0 kW running
- Motor in the cost sheet
- 5.6 kW · 20 h · 0.8 factor
- Power (E1)
- ₹ 15.23 per ton
- Dosing (E2)
- ₹ 4.18 per ton
- Operating cost
- ₹ 19.41 per 1,000 L · ₹ 971 / day
E1 = (motor kW × ₹8.50/kWh × 20 h × 0.8) ÷ tons per day. At 50 TPD that is (5.6 × 8.50 × 20 × 0.8) ÷ 50 = ₹15.23. Dosing ₹4.18. Total ₹19.41 per 1,000 litres. Tariff varies by state.
Water in, water out
Pollution drops about 80–95%. Outlet is for safe discharge.
| Parameter | Incoming sewage | After treatment |
|---|---|---|
| COD | 400 mg/L | ≤ 60 mg/L |
| BOD | 250 mg/L | ≤ 20 mg/L |
| Ammonia | 45 mg/L | ≤ 15 mg/L |
| Phosphorus | 5 mg/L | ≤ 1 mg/L |
| E. coli | 100,000 | ≤ 50 |
| pH | 6–9 | 6–9 |
Process flow
Sewage to discharge.
50 ton-per-day municipal train. Screen, equalise, three biological tanks, MBR, chlorine dioxide.
Process
- 01Septic tank — settle solids, start breakdown
- 02Grating screen — plastic, cloth, food, large solids
- 03Equalization tank Ø 2.5 m × 6 m — mix, steady the load
- 04Anaerobic tank — no oxygen, break big molecules
- 05Anoxic tank — strip nitrogen
- 06Aerobic contact oxidation — blowers, media, bacteria eat the rest
- 07MBR membrane — bacteria, solids, fines out
- 08Chlorine dioxide disinfection — then discharge
Equipment
- Grating screen
- Equalization tank Ø 2.5 m × 6 m
- Integrated treatment — anaerobic, anoxic, aerobic
- Sewage lift pumps (2) · level · flow meter
- Blowers (2) · aeration pipes · bio media
- MBR tank and membrane modules
- Return, backwash and self-priming pumps
- Sludge tank and recycle
- Chlorine dioxide generator and disinfection tank
- PLC automatic control
Standards
- CPCB discharge practice
- COD ≤ 60 · BOD ≤ 20 mg/L at outlet
- ISO 9001:2015 house
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