SECTION 1 – GENERAL SPECIFICATION
1.1 SYSTEM OUTLINE
This specification covers the requirements for the design and supply of 1 m3 Sewage Treatment Plant.
The plant consists mainly of
- Biofilter Tank system
- Blower
- Pump
- Panel
The black and grey water from septic tank is pumped and fed to the biofilter system by submersible pump (automatic operation). In the Biofilter tank, black and grey water that contains BOD and COD is processed by bacteria and the BOD and COD level become lower and can fulfill the requirement of government.
Effluent that goes to the environment inject by oxidizing biocide to kill E- coli (pathogenic bacteria).
SECTION 2 – DESIGN BASIS
INFLUENT (SEPTIC) WATER QUALITY
| NO | PARAMETER | UNIT | RESULT |
| Physical | |||
| 1 | Temperature | oC | 31 |
| 2 | TDS (Total Dissolved Solid) | mg/l | 627 |
| 3 | SS (Suspended Solid) | mg/l | 237 |
| 4 | Colour | Scale Pt.Co | 1544 |
| Chemical | |||
| 5 | pH | 6,0-9,0 | |
| 6 | Iron | mg/l | 1,95 |
| 7 | Manganese | mg/l | 0,747 |
| 8 | Copper | mg/l | 0,21 |
| 9 | Zinc | mg/l | 0 |
| 10 | Hexachorome | mg/l | 0,158 |
| 11 | Nickel | mg/l | 0,031 |
| 12 | Sulfide | mg/l | 0,337 |
| 13 | Fluoride | mg/l | 0,74 |
| 14 | Chlorine Gas | mg/l | 0,21 |
| 15 | Free Ammonia | mg/l | 0,034 |
| 16 | Nitrate | mg/l | 10,4 |
| 17 | Nitrite | mg/l | 0,028 |
| 18 | COD cr | mg/l | 439 |
| 19 | BOD 5 | mg/l | 221 |
EFFLUENT WATER QUALITY
| PARAMETER | UNIT | COMMON |
| PRACTISE | ||
| BOD | mg/L | 300 |
| COD | mg/L | 500 |
SECTION 3 – EQUIPMENT SPECIFICATION
3.1 SUBMERSIBLE PUMP
Quantity 1 set (1 duty, 0 standby)
Make Showfou ss 232 N
Flowrate 0.6 m3/min
Motor 1.5 kW, 380V/3ph/50Hz
Operation Automatic
3.2 GROUND TANK
Quantity 1 set
Capacity 1 m3
Material Concrete
Tank Size 1000x1000x1500 mm
3.3 EQUALIZATION TANK
Quantity 1 set
Capacity 3 m3
Material Concrete
Tank Size 1000x1000x1500 mm
3.4 AERATION TANK
Quantity 1 set
Capacity 6 m3
Material Concrete
Tank Size 2000x1000x1500 mm
3.5 PRIMARY CLARIFIER TANK
Quantity 1 set
Capacity 4.5 m3
Material Concrete
Tank Size 2000x1500x1500 mm
3.6 SECONDARY CLARIFIER TANK
Quantity 1 set
Capacity 4.5 m3
Material Concrete
Tank Size 2000x1500x1500 mm
3.7 SAND FILTER
Quantity 1 set
Material FRP Pentair
Tank Size ø13”x54”
3.8 SAND FILTER PUMP
Quantity 1 set
Make Grundfos
Flowrate 1 m3/h
Motor 0.46 kW, 380V/3ph/50Hz
3.9 CHEMICAL DOSING UNIT
Quantity 3 sets
Chemical PAC
Polymer
Caustic Soda
DOSING TANK (Per set)
Quantity 1 no
Type Vertical, cylindrical
Capacity 150 litres
Material PE-Profil Tank
DOSING PUMP (Per set)
Quantity 1 no
Type Solenoid drive diaphragm, manual adjustment
Make grundfos or equal
Flowrate 5 l/h (max)
Head 60 m
Material PP
3.10 pH ADJUSMENT TANK
Quantity 1 set
Material Concrete
Tank Size 1000 x 1000 x 1500 mm
3.11 PIPING AND VALVE
Quantity 1 lot
Material PVC Wavin
Carbon Steel
Main Size 2”
3.12 CONTROL PANEL
Quantity 1 no
Type Outdoor
Access Front
Material Mild steel with oven baked epoxy finish
Supply voltage 220V/50Hz/1ph/2 wire
The control panel shall comprise of following
- One (1) no main circuit breaker with indicating light
- One (1) lot motor starter, each consist of isolating switch, contactor, thermal overload relay, selector switch, and indicating lamps