Method for recovering suspended solids from residual effluents

摘要

A process for the treatment of contaminated fluid and wastewater containing residuals from food processing and waste and residuals from animal feeding operations and effluent from the digestion of these residuals is disclosed. The process is carried out in an enclosed tank using a separation procedure that maintains the state of the separated solids in the same state as they were upon introduction to the system, i.e., aerobic, anaerobic or anoxic, based on the condition of the solids upon introduction to the system. The system utilizes rotary flow instead of rakes to harvest the solids from the effluent. The process has applications in the recovery of emulsion in wastewater treatment and the operation of digesters for re-feeding to the digester.

主权项

1. An apparatus for the treatment of a contaminated fluid comprising,
a closed integral tank (100); a means (200) for introducing a mixture of suspended solids and a contaminated fluid into the tank which comprises a plurality of inlets arranged around the perimeter of the tank (100), wherein the portion of the inlet located inside the tank (100) is positioned at an angle that is non-perpendicular relative to the portion of the inlet located outside the tank (100), wherein a rotary flow is imparted to the mixture within the tank (100); a means (310) for collecting the suspended solids that float to the surface of the mixture having an inlet inside the tank (100) and an outlet outside the tank (100), wherein the weir is located within the center of the tank (100), wherein said suspended solids float due to gas bubbles of a gas introduced into the contaminated fluid prior to the introduction of the mixture into the tank (100); a means (410) for permitting decontaminated liquid to be removed from the tank; a means (320) for permitting the suspended solids to be removed from the tank without mechanical harvesting; and a central weir that serves as a barrier or collection point for collecting the suspended solids, the central weir having an opening at its top that permits the suspended solids to pass into the opening and exit the tank without a mechanical collection system, wherein the tank (100) is a closed system; the means (200) are used for the purpose of introducing the mixture of suspended solids and a contaminated fluid into the tank (100), the means (320) are used for permitting the solid residuals to be removed from the tank (100) and the means (410) are used for the removal of decontaminated liquid from the tank (100), the tank (100) contains no other inlet other than means (200) and no outlet other than means (320) and means (410), the means (410) and means (320) are located at the center of the bottom, external end of the tank (100), and the decontaminated liquid is not recycled back to the tank.