Patent ID: 8518249

Claim:
A wastewater treatment system comprising: a sludge retention chamber, an anoxic chamber, an aeration chamber, a clarifier chamber, a wastewater and sludge aeration and recirculation systems, an instrumentation; said sludge retention chamber is provided for settling and retention of inlet wastewater suspended solids (primary, suspended solids) and waste (excess) activated sludge which is continuously or intermittently wasted into said sludge retention chamber; said anoxic chamber is provided for receiving clarified (settled) inlet wastewater from said sludge retention chamber and recirculated wastewater and activated sludge from a wastewater and sludge recirculation, not aerated, stream continuously or intermittently; said aeration chamber is provided for wastewater treatment aeration process in which four horizontal aeration zones are developed and which are from the bottom to the top; high aeration, moderate aeration, low aeration and anoxic zones; said clarifier chamber is provided to separate treated wastewater and activated sludge, wherein clarified treated wastewater overflows to an effluent pipe and activated sludge settles to the bottom of said clarifier and is returned by an aeration and recirculation pump partially to said aeration chamber, said anoxic chamber and said sludge retention chamber where the activated sludge is wasted; said wastewater and sludge aeration and recirculation system comprises a wastewater aeration and recirculation pump and an air aspirator-mixer to provide wastewater and activated sludge aeration and recirculation and the activated sludge waste to said sludge retention chamber; said instrumentation comprises an inlet wastewater flow meter located on an inlet wastewater pipe, a suspended solids meter and a dissolved oxygen meter located in said aeration chamber, a rotometer and an open/close control valve provided for an aeration system, and control valves located on said recirculation stream discharge pipes to said sludge retention chamber, said anoxic chamber and upper part of said aeration chamber.