Apparatus for cleaning water treatment tank surfaces

An apparatus for cleaning algae and other debris from the surfaces of a round water treatment tank of the type having a central influent, a revolving skimmer arm, a generally circular baffle with inner and outer surfaces, a generally circular weir with inner and outer surfaces supported on a spillway radially spaced from said baffle, and a peripheral wall radially spaced from said spillway defining a bottom wall and clean water flow channel therebetween, the apparatus comprising:

• frame means mounted on said revolving skimmer arm and driven around the full circumference of said generally circular weir by said skimmer arm;
• articulated link arm means pivotally connected at one end with said frame means to pivot in a vertical plane relative thereto and to move in a horizontal inward and outward direction in relation to the center of rotation of said skimmer arm to compensate for out-of-round and imperfect circular weir surfaces;
• a pair of weir cleaning brushes pivotally mounted at a second end of said articulated link arm means and disposed in a generally vertical orientation with their bristles facing each other in laterally opposed relation to be received and engaged one on each side of said weir for cleaning said inner and outer surfaces of said weir;
• resilient means connected with said link arm means and said weir cleaning brushes for biasing said pair of brushes into a substantially vertical orientation and to allow pivotal movement thereof when a lower end of either one of said pair of brushes engages a bracket or obstruction so that said pair of brushes will pass over said bracket or obstruction and are then returned to the biased substantially vertical orientation;
• and
• a generally rectangular sweeper connected with said weir cleaning brushes to move therewith and extending over at least a portion of the space between said baffle and said weir and having a plurality of elongate vertical strips of flexible material extending into the water in the space between said baffle and said weir to sweep and facilitate passage of algae and debris floating in the water space through said weir as it is pulled therethrough by said skimmer arm.