2012 Ocean Ranger Guidebook Revision 3-7-12 - Alaska ...

2012 Ocean Ranger Guidebook 3-7-12
Zenon system
Ryndam
Statendam
Volendam
Zaandam
Ryndam
Veendam
Waste Streams into the Zenon System
All gray water from the accommodation plus all wastewater, i.e. galley, laundry &
Somat is collected in the equalization (holding) tanks. This wastewater is then
pumped with the gray water pumps to the Masko-Zoll filters. Black Water is
pumped from the Evac units towards the Masko-Zoll filters. Just prior to entering
the Masko-Zoll filters the black & gray water is mixed.
1st Process – Solid Filters
This mixed stream of black & gray water is filtered in the Masko-Zoll screens and
the screened water runs into tank-70. The plastics & other solids filtered from the
black & gray water, produces a waste stream called solid waste that is stored in
tank-72. This solid waste is landed ashore approximately every 4 weeks.
2nd Process – Biological
The biological process happens mainly in the bioreactor & partly in the
membrane tank. This screened black & gray water (called screened raw water) is
pumped out of tank-70 by the raw water pumps into the bioreactor, (previously
3P FW tank). The water in the bioreactor is now known as biomass. In the
bioreactor the bacteria (bugs) eat the waste products and convert these into
CO2, H2O and some other products plus heat. Therefore the biological process
partly cleans up the biomass preparing it for the next process i.e. ultra filtration. It
is necessary to waste biomass to keep the bacteria at the correct level. Biomass
waste is transferred to 6 Port/Stbd DB’s. It is legally regarded as untreated black
water and therefore may only be pumped directly overboard when >12’ from
shore & not in a special area. Biomass wasting is a daily routine.
3rd Process -Ultra filtration
The biomass is pumped out from the bioreactor using the recirculation pumps
and into the membrane tank, (previously 4P FW tank). It then overflows back into
the bioreactor where it is subject to further biological process. Ultra filtration
occurs in the membrane tank. Here permeate is drawn out of the biomass
through the millions of microscopic pores in the membrane fibres (looks rather
like hollow spaghetti) by means of the process/permeate pumps. These pumps
create a very low vacuum inside the fibers of the membranes. The permeate is
first used for filling up the back-pulse tanks. At 10 minute intervals this process
reverses and permeate is taken out of the back-pulse tanks & is pumped back
through the membranes. This is done to clean the pores in the membrane fibres.
4th Process – UV filter
64