Final Effluent Treatment Plant:
The Final Treatment Plant consists of neutralization system, clarification system,
aeration system for biological oxidation of organic matter, guard pond & pumping
Physio–Chemical Treatment is dedicated to correct the pH and removal of suspended
particles. Lime slurry is added for neutralization. Suspended solid are removed by
gravity settling in pre primary & primary clarifiers using Poly electrolyte (Flocculent) &
PAC / SAC (Coagulant). The primary sludge generated is taken to decanter to
concentrate it up to 60% by weight. The system comprises of flash mixer, chemical
dosing tanks, pre primary & primary clarifiers and pumps. Sludge generated is sent to
secure land fill.
The neutralized and clarified effluent is given biological treatment. In aeration system
HRT of 2½ days is provided. The system comprises of aeration tanks, air diffusion
system, secondary clarifier, sludge recirculation pump & blower houses.
The biologically treated effluent is monitored for quality and is finally discharged deep
into the sea. The sludge generated from biological system is concentrated in decanter
The liquid effluent from decanter is channeled to aeration tank. The concentrated
biological sludge is disposed to secured landfill.
Final collection & Disposal:
The final treated effluent is collected in sump from where it is discharged deep into the
sea with the help of 44 km long onshore & 10 km long offshore pipe line through
scientifically designed diffuser. At marine outfall point approximately 200 times dilution
is available & dispersion rate is too high. A Guard pond with 24 hrs detention time is
provided to hold effluent in case of emergency. Treated effluent is monitored with the
help of on line pH meter, TOC analyzer & flow meter before being finally discharged.
Composite sample analysis is made to ensure compliance to marine standard.