Wastewater trickle tower biomedia strands arrangement

A biomedia filter unit for incorporation in a trickle tower wastewater treatment apparatus, said filter unit comprising:

• a grate comprising a plurality of hanger frames, each hanger frame comprising a row of spaced-apart biomedia strands;
• each frame further comprising a pair of mutually connected upper bars and a pair of mutually connected lower bars, upper ends of the strands of a respective row being clamped between the upper bars and lower ends of these strands being clamped between the lower bars;
• and
• the rows of biomedia strands being spaced apart with the upper bars of the grate being connected together and the lower bars of the grate being connected together.

A wastewater trickle tower apparatus, comprising:

• at least one biomedia grate comprising upper hanger bars, lower hanger bars, and spaced-apart rows of looped cord biomedia strands connecting said upper and lower hanger bars;
• upper ends of said strands being secured by said upper hanger bars, and lower ends of said strands being secured by said lower hanger bars;
• a base receptacle below said grate;
• said upper hanger bars being secured together as a unit;
• said lower hanger bars being secured together as a unit;
• and
• tensioning means for tensioning said strands by influencing the upper and lower hanger bar units apart.