Apparatus and method for improved high-efficiency dissolved air flotation fluid processing

A dissolved gas flotation tank system comprising:

• a tank having a top, a bottom and an interior volume for receiving an influent feed stream therein;
• an influent feed pipe positioned to direct influent feed into said tank;
• a recirculation line extending from said tank to said influent feed pipe, said recirculation line being positioned to receive effluent from said tank for transport through said recirculation line;
• a pump system in fluid communication with said recirculation line to introduce gas directly into a pump, for dissolving gas into said effluent, said pump system further comprises a multiple stage chaos a series which has a series of in-line turbines for increasing the energy of the effluent in the recycle line;
• a pre-contact chamber in fluid communication with said influent feed pipe sized and configured to receive simultaneously an influent feed stream, effluent from said pump system containing dissolved gas in solution and a quantity of chemical;
• and
• a float processing system positioned near said top of said tank for processing float material which is removed from said tank.

A dissolved gas flotation tank system comprising:

• a tank having a top, a bottom and an interior volume for receiving an influent feed stream therein;
• an influent feed pipe positioned to direct influent feed into said tank;
• a recirculation line extending from said tank to said influent feed pipe, said recirculation line being positioned to receive effluent from said tank for transport through said recirculation line;
• a pump system in fluid communication with said recirculation line for dissolving gas into said effluent, said pump system including a centrifugal pump having an impeller with an eye and a volute;
• gas introduction apparatus connected to said pump for introducing gas directly into said pump away from said volute and the eye of the impeller;
• a pre-contact chamber in fluid communication with said influent feed pipe sized and configured to receive an influent feed stream, effluent from said pump system containing dissolved gas in solution and a quantity of chemical;
• a fluid conduit positioned to deliver said quantity of chemical to said pre-contact chamber;
• and
• a float processing system positioned near said top of said tank.