Water/Waste Processing - Feb 2012
Four DynaOxy units were installed in a compact group at the lowest point of the site allowing them to receive their input flows from the existing process units The treated effluent from the units is used for more than just the internal automatic media washing inside the filtration units says Luchon Its clean enough for us to use to wash down within the site itself including cleaning purposes and washing the screens at the initial input to the plant This reduces the cost of running the plant and its impact on the environment as it reduces our need to extract clean water for our own use The whole process was relatively quick adds Smith From determining that something had to be done to commissioning took only a couple of years We had learned from previous installations and everything was well planned and went smoothly No crises or unexpected problems After protracted use the system works well and in day today running is virtually automatic requiring a weekly visual check on the different equipment elements and a monthly monitoring of generated reports mostly concerning the results of sand sinking speed and of media washwater flow within the units If the sinking speed is too high the air lift pump raises too much sand and could result in media being washed away and lost If the sinking speed is too low the media would not be moved quickly enough to be cleaned correctly This means that the media washwater flow has to be set up and maintained in correlation with the sand sinking speed to be sure the media is cleaned with the right amount of washwater The continuing growth of Gillingham is taken into account as well The effectiveness of the Dynasand units can be augmented with a marginal top up of filtration media each unit can take approximately a further meter of basalt sand which will increase effectiveness And predicting the need when the four units were installed the pipework and other infrastructure was put in place to allow for a fifth unit to be brought in and commissioned with minimal disruption The installation in its present configuration is designed to meet anticipated needs till 2013 but with additional media and the fifth unit it is expected to meet Gillinghams needs until the year 2020 Nordic Water www nordicwater com Write In 201 Write In 109 www waterwaste com Water Waste Processing February 2012 15
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