Abstract: A small-sized, low cost to manufacture and inexpensive wastewater treating biological film tank by which wastewater produced in each home can be treated by each home. A treating tank 10 has therein multi continuous-pore soft ceramic 40. Waste or raw water is supplied into the tank from its top through a waste/raw water supplying pipe 21, and pushed up by the action of air bubble forced into the tank from its bottom through an air bubble generator 30, and then flows over through cylindrical guide 50 into the multi continuous-pore soft ceramic 40 wherein the water is purified by microorganisms which digest the nutrient in the waste or raw water. Surface area of the multi continuous-pore ceramic element 40 is about 25 times larger than that of a conventional plastic element.

Abstract: A small-sized, low cost to manufacture and use wastewater treating biological film tank by which wastewater produced in a single home can be treated in each home. A treating tank has arranged therein multi continuous-pore soft ceramic biological film elements. Waste or raw water is supplied into the tank through a waste/raw water supply pipe arranged in the top of the tank, pushed up through a cylindrical guide by the action of air bubbles forced into the tank through an air bubble generator arranged in the bottom of the tank, and then forced to flow over the cylindrical guide into and through the multi continuous-pore soft ceramic biological film elements wherein the water is purified by microorganisms which digest the nutrients in the waste or raw water. The surface area of each multi continuous-pore ceramic biological film element is about 25 times larger than the surface area of a conventional plastic biological film element.