Gyratory aerobic aeration treatment tank

A self-contained waste treatment tank for processing sewage, which comprises:

• a cylindrical tank having a bottom wall, a cylindrical side wall, and a top wall, said top, bottom and side walls defining a chamber therebetween, said chamber containing a predetermined liquid level therein;
• a cylindrical baffle mounted in said chamber, said baffle being concentrically arranged with said side wall and dividing said chamber into a first chamber part and a second chamber part, said cylindrical baffle having a lower end attached along the bottom wall of said tank and an upper end extending above the sewage level in said tank, said cylindrical baffle having a pluraity of openings formed in it for permitting communication between said first and said second chamber parts, said openings being formed in said baffle along the lower end of said baffle by displacing a portion of the material forming said baffle, the material so displaced defining protective means, said protective means permitting communication between said second chamber part and said first chamber part, thereby permitting the recirculation of sludge from said second chamber part to said first chamber part;
• sewage inlet means communicating with said first chamber part;
• inlet means in said cylindrical baffle communicating between said first chamber part and said second chamber part, said inlet means being positioned below the liquid level in said chamber;
• means for generating a horizontal circulatory flow pattern in said first chamber part, said flow generating means comprising a submersible pump having an inlet positioned toward the bottom of said first chamber part and an outlet, and linkage means operatively connected to the outlet side of said pump, said linkage means comprising first and second pipe sections having substantially different internal diameters, and connection means between said first and said second pipe sections including an expansion part for increasing the size of said linkage from said first diameter to said second diameter, said first pipe section being attached to the outlet of said pump, said second pipe having an outlet in and below the fluid level in said first chamber part, said horizontal circulatory flow pattern generating means creating a flow pattern in said first chamber part which directs fluid from said first chamber part to said second chamber part through said inlet means and which simultaneously draws fluid from said second chamber part to said first chamber part along the opening in the lower end of said cylindrical baffle;
• and
• air supply means including at least one tubular member operatively connected between a source of air and the expanding part of said connection means so that passage of fluid through said expansion part induces a differential pressure between the ends of said tubular member.

A self-contained waste treatment tank, which comprises:

• a cylindrical outer shell, said shell having a bottom wall, a cylindrical side wall, and a top wall, said outer shell delimiting a chamber;
• a baffle mounted in said chamber, said baffle dividing said chamber into a first chamber part and a second chamber part, said first and said second chamber parts being arranged concentrically with respect to one another, said baffle having a lower end attached along the bottom wall of said outer shell, and an upper end extending above a liquid level in said chamber, said baffle having at least one opening permitting communication between said first and said second chamber parts along the lower end of said baffle so that the flow pattern in said first chamber part draws solid particles from said second chamber part into said first chamber part;
• sewage inlet means communicating with said first chamber part;
• inlet means in said baffle communicating between said first chamber part and said second chamber part, said inlet means being position below the liquid level in said chamber;
• outlet means communicating with said second chamber part and a point external of said outer shell;
• and
• means for generating a horizontal circulatory flow pattern in said first chamber part, said flow pattern generating means comprising a pump submersed in said first chamber part, said pump having an inlet and an outlet, said inlet being positioned toward the bottom of said first chamber part, and linkage means connected to the outlet of said pump, said linkage means including a first pipe operatively connected to the outlet of said pump, connection means connected to a second end of said first pipe, and a second pipe having a first end operatively connected to said connection means and an open second end positioned below the liquid level in said first chamber part, said horizontal circulatory flow pattern generating means creating a flow pattern in said first chamber part which directs fluid from said first chamber part to said second chamber part through said inlet means and which simultaneously draws fluid from said second chamber part to said first chamber part along the opening in the lower end of said cylindrical baffle.