Page 2 - STP Brochure

Sewage Treatment Plants Victor Marine’s FBBR Series (Fixed Bed Bio lm Reactor) Biological Sewage Treatment Plant
has been developed using the extremely well proven and compact xed bio lm technology.
The system has been approved to the latest IMO standard MEPC 227(64) (excluding section
4.2) and MEPC 159(55) and also certi ed by BV to EC MED Mod B+D. It is a three-stage sewage
treatment system which can process from a gravity or vacuum feed. Supplied with the latest
touch-screen HMI display and PLC, the plant can be easily monitored and controlled making
the system very operator friendly.

Process Diagram Designed,
Assembled &

Tested in
the UK

Process Description
In the rst stage, macerated sewage is fed to the Bioreactor, an aerobic biological system,
using a xed structured inorganic media bed with very high speci c surface area to allow
bio lm growth. This ‘ xed bed’ system maximises the biomass volume, increasing the
e ciency of the bioreactor. It is also designed to direct the in ow sewage through an
extended retention pattern to ensure maximum treatment and no bypass. A low pressure
aeration system provides the bioreactor with a constant and uniform supply of oxygen to the
biomass whilst preventing odours and hazardous gases from forming.

The scoured biomass passes into the second stage via a Flow Control Unit (FCU) into the
Settlement Tank. The FCU controls and stabilises the system during peak and low ows. The
advanced settlement tank employs tube settlers and skimmers which magnify the
settlement e ect and also prevents disturbances due to the motion of the ship. Due to the
increased e ciency, the settlement tank is smaller than conventional settlers whilst
producing a clearer e uent and better results than the required IMO standard.

Prior to overboard discharge, the e uent water is treated in the third stage, the Chlorination
Unit. This is a tablet dispensing unit which is both simple and easy to use, saving engineer’s
time when operating. Finally, during discharge overboard, the e uent is pumped into a
dechlorination unit which removes any excess chlorine, as per IMO requirements.

Thermotolerant Coliform IMO MEPC 227(64) FBBR Series
Total Suspended Solids (TSS) Discharge Limits Test Results
Biological Oxygen Demand (BOD/day) < 100/100 ml 1.75 coliforms/100ml
Chemical Oxygen Demand (COD) < 35 Qi/Qe mg/l 11.46 mg/l
pH < 25 Qi/Qe mg/l 2.99 mg/l
Free Chlorine < 125 Qi/Qe mg/l 36.53 mg/l
between 6 and 8.5
< 0.5 mg/l 0.09 mg/l

www.victormarine.com Tel: +44 (0) 1708 899780