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

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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
2012 Ocean Ranger Guidebook 3-7-12 Permeate that is not used in the back-pulse tanks then passes through a UV filter. The UV-unit is used as a final disinfection unit before the water is used for other purposes e.g. technical water, or into the main ballast or simply system discharged overboard where allowed. Note: It appears that some of the Zenon Systems get an upgrade in 2011. At this time detailed information of the AWTS system is not provided by the vessels. 65
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