Cheung Sha Wan is a large food market in central Hong Kong to which Hydria Water is to deliver four Centerscreen CG and two Multiscreen Rake MR, which are to be used to treat raw water for tanks containing live fish. The machines are eight metres high and, due to the low ceiling height and constraints of the indoor space, will have to be assembled on-site and shipped from Sweden in parts.
– Shipping our products in parts forces us to think innovatively and in new ways in relation to a simple assembly, but at the same time this method saves a great deal of shipping space and we are able to ship the machines in one container instead of three. We will be on site to perform supervision during the assembly, and a delegation will also visit us in Sweden to learn more about the assembly process and the machines, Marko Kunerus Sales Manager at Hydria Water says.
Due to stricter environmental requirements, Oslo no longer has the option to simply dump the snow removed from the city’s streets in the fjord, as has been done in the past. The Terje snow-melting system is a climate-smart pilot project that NCC has developed on a commission by the City of Oslo, and purifies snow using Hydria Water’s screens.
Terje weighs 500 tonnes, is 50 metres long and 26.5 metres wide, and operates at a depth of 3.5 metres below the surface of the quay near the Akershus Fortress in Oslo, where it is docked from mid-December to March. During the high season, snow is dumped into Terje’s intake grills on the deck of the barge by up to 20 fully loaded lorries per hour, then purified in several steps. Sea water is used to melt the snow. Up to 1000 cubic metres of water is collected from a depth of 24 metres, where the water temperature is typically between 4 and 10°C in the winter. At a sea water temperature of 9°C, it is possible to melt roughly 1000 cubic metres of snow per hour; if it drops to 4°C, the rate of melting is approximately 500 cubic metres per hour.
The efficiency of the purification process is 70% on average, and over 90% of the heavy metals in the snow are removed. The first step is a sedimentation process, in which stones and gravel are screened out when the snow is mixed with sea water and run through Hydria Water’s screens. The water is then transported through purification channels equipped with micro filters and lamella clarifiers. Over a tonne of oil per season is also screened out before the purified water is eventually released back into the fjord.
Read more at ncc.se/snowclean
Foto: Odd Richard Valmot/NCC