Water and wastewater treatment system

Abstract

A biological treatment system involving the use of a gas dissolving pressure vessel, a pressurized water release assembly, a pretreatment chamber, a bioreactor, an open vessel, a post-treatment unit, a sludge removal unit, and a removable gas collection and purification unit for both wastewater treatment and air emission control is described. Gases are dissolved efficiently in a water inside the pressure vessel under controlled high pressure and high rotating velocity. Chemicals, or microorganisms, or both arm dosed to an influent water producing a pretreated water containing chemical flocs and biological flocs. The bioreactor comprising a hanging biological contactor is adopted when biochemical reaction is intended. A pressurized water containing supersaturated gases is produced in the pressure vessel and than depressurized through the pressurized water release assembly becoming a depressurized water containing micro bubbles. The pretreated water containing chemical flocs or biological flocs, or both are gently mixed and held together with the depressurized water containing micro bubbles in the open vessel for separation of chemical/biological flocs to the water surface, producing a purified effluent and a waste gas. A portion of the purified effluent is recycled for gas dissolution and micro bubbles production. When necessary, the waste gas is collected, purified and recycled to the pressure vessel or the bioreactor, or both for reuse.