The skim-pak Floating weir Decanter. The decanter and swing arm follow the surface of the tank when the sump of the decanter is evacuated by pumping or gravity flow an equal amount of product comes into the unit over the flow controlled weirs. A scum barrier blocks the entry of the liquid surface allowing only supernate to be recovered. If the surface is desired product then the scum barrier is removed and the skim-pak operates as a skimmer. The rate of decant is set to match the rate of separation in sequential batch reactors or settling tanks. Normally a maximum flow of 2.8 cubic meters per meter of weir is desired rate of decanting. The weir and therefore the decanter is size to reach the required decant rate for the specific tank.
Douglas Environmental's positive closure engages when the decanter is at rest minimizing leakage into the decanter sump. A gentle back-flush eliminates the withdrawal need to remove the decanter from the liquid while in filling or aeration cycle.
The use of a floating, self-adjusting weir provides a consistent rate of water withdrawal allowing for the most amount of water without disturbing the scum or sludge layers. Clean according to regular tank maintenance schedule. No Additional maintenance required.
Douglas Environmental Decanter Heads come in a variety of sizes to suite decanting needs and specifications.
Click to view our WWTP Application Worksheet
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