The most important reason you need a scrubber is mainly for long term operational flexibility for 2020 and beyond. Against the changes on the fuel prices for the marine gas oil and also for the ascertained availability, you need a scrubber when the global gap will come.
Most of the customers look at the scrubbers only as an upfront investment. But, in reality, it is a long term serving opportunity. Even if the fuel prices dropped, the differential between HFO and MGO is steadily around 250$ per tons. Operators can save between 2-3 M$ of pure fuel costs per annum, not taking care of the operating expenses of the scrubber. The pay back period is less than three years including installation cost, depending on time spent in ECA. Scrubbers are suitable for every ship type.
Responding to the criticism for the scrubbers about the pollution of the sea and that they aren’t a mature technology, I will try to expand a little bit about the pollution of the sea. The Sox emissions from the shipping are in continuous expansion, because the market is growing. This is good news. But, the Sox emission causes dry and wet precipitations. The dry precipitations, like the aerosol, cause asthma, heart and lung disease. The acid rains on land with PH 4 affect the forests, the buildings and the lakes. The acid rain on sea with PH 4 is a bit different, because the sea water act as a huge scrubber. Thanks to the water alkalinity, we can transform the sulphuric acids in to harmless sulphates and sulphites preventing the water acidification. But for sure, the metals and the particulate matter and the PAH will still remain in the water, because the sea water can’t do any treatment.
With scrubbers, we avoid all the Sox dry precipitations, the aerosol and the acid rains. From typical ferry ships, we can save 500t CO2 emissions per year per ship. From large containership is calculated that we save about 2000t per year per ship.
Also, we provide a continuous monitoring of the water quality, so we guarantee the PH higher than 6.5 at 4 meters, which is recognized as a neutral PH. Then, we check turbidity, as a suspended solid indicator. Lastly, we check the PAH, as an unburned compound indicator.