Transportable Wastewater Treatment Tank

Abstract

The disclosed embodiments provide a fiberglass (i.e., fiberglass-reinforced polymer) wastewater treatment tank that has at least one lower portion and an upper portion that are joined above the tank water line. The lower portion or portions is/are tapered to allow a plurality of tanks to be nested in a shipping configuration. The top portions may optionally be tapered to allow them to also nest during shipping. Interior tank elements such as clarifier walls, risers, BAT media, aerators, divider walls, piping, etc. can be stacked and shipped within the uppermost of the nested lower portions or possibly used as packing material between nested tanks.

1 . A tank for a wastewater treatment plant, comprising:
 at least one lower tank portion having a bottom wall and side walls, wherein at least some of the side walls are tapered so as to allow identical lower tank portions to nest therein, wherein the side walls extend above a waterline of the treatment plant; and   at least one lid portion for joining to the at least one lower portion;   wherein the at least one lower portion and the at least one lid portion are formed from fiberglass-reinforced polymer.   
     
     
         2 . The tank for a wastewater treatment plant of  claim 1 , comprising a single lower tank portion with a tapered pair of walls forming a divider wall between a pretreatment chamber and a treatment chamber. 
     
     
         3 . The tank for a wastewater treatment plant of  claim 2 , comprising a single lid portion. 
     
     
         4 . The tank for a wastewater treatment plant of  claim 3 , wherein the single lid portion further comprises a reinforcement spanning the divider wall in the single lower portion. 
     
     
         5 . The tank for a wastewater treatment plant of  claim 3 , further comprising media supports in at least the treatment chamber. 
     
     
         6 . The tank for a wastewater treatment plant of  claim 5 , further comprising media supports in the pretreatment chamber. 
     
     
         7 . The tank for a wastewater treatment plant of  claim 1 , comprising one lower tank portion and a separate divider wall for on-site installation between a pretreatment chamber and a treatment chamber. 
     
     
         8 . The tank for a wastewater treatment plant of  claim 7 , further comprising raised portions in the bottom wall for assisting in sealing the divider wall. 
     
     
         9 . The tank for a wastewater treatment plant of  claim 7 , comprising a single lid portion. 
     
     
         10 . The tank for a wastewater treatment plant of  claim 9 , wherein the single lid portion further comprises a reinforcement spanning the divider wall in the single lower portion. 
     
     
         11 . The tank for a wastewater treatment plant of  claim 7 , further comprising media supports in at least the treatment chamber. 
     
     
         12 . The tank for a wastewater treatment plant of  claim 11 , further comprising media supports in the pretreatment chamber. 
     
     
         13 . The tank for a wastewater treatment plant of  claim 1 , comprising two lower tank portions with a first lower tank portion forming a pretreatment chamber and second lower tank portion forming a treatment chamber and a settling chamber. 
     
     
         14 . The tank for a wastewater treatment plant of  claim 13 , further comprising media supports in at least the treatment chamber. 
     
     
         15 . The tank for a wastewater treatment plant of  claim 13 , comprising a single lid portion. 
     
     
         16 . The tank for a wastewater treatment plant of  claim 15 , wherein the single lid portion further comprises a reinforcement spanning the first lower tank portion and the second lower tank portion. 
     
     
         17 . The tank for a wastewater treatment plant of  claim 14 , further comprising media supports in the pretreatment chamber. 
     
     
         18 . The tank for a wastewater treatment plant of  claim 5 , wherein the media supports comprise interlocking channels. 
     
     
         19 . The tank for a wastewater treatment plant of  claim 11 , wherein the media supports comprise interlocking channels. 
     
     
         20 . The tank for a wastewater treatment plant of  claim 14 , wherein the media supports comprise interlocking channels.