Patent ID: 7597801

Claim:
A wastewater treatment plant comprising: a reaction tank connected to an wastewater supply tube and an aeration apparatus to receive wastewater therein; a sludge separation unit dividing an internal space of the reaction tank into upper and lower sections to increase an amount of dissolved oxygen by increasing an contact area of the wastewater and bubbles and to separate relatively light materials by moving low density matters existed on a surface of each section upward in turn; an air exhaust tube mounted on the reaction tank to exhaust bubbles passing through the sludge separation unit out of the reaction tank; a treated water exhaust tube mounted on the reaction tank to exhaust the wastewater that is treated by passing through the sludge separation unit; and a settling tank provided on a bottom of the reaction tank to concentrate and exhaust the settled sludge, wherein the sludge separation unit comprises first and second sludge separation parts, each other first and second sludge separation part comprising a plate dividing an inner space of the reaction tank into upper and lower sections and provided with a plurality of through holes, a plurality of fluid flowing tubes formed on a bottom of the plate to define the staying space collecting the gas and to allow the wastewater and the gas to flow along thereof, and a plurality of guide members provided under the fluid flowing tubes to improve the solubility of the air, whereby, when the gas and the wastewater moves upward to reach the sludge separation unit, low density matters contained in the air is collected in the staying space and high density matters contained in the wastewater is remained in the lower section, thereby primarily moving the low density matters existed on a surface of the sludge separation unit, and wherein each of the fluid flowing tubes comprises a sidewall and a bottom wall coupled to the sidewall and having a center hole, each of the guide members comprises a bottom plate, an edge plate, a side plate coupled between the bottom plate and the edge plate, and the edge plate is located under the bottom wall of the fluid flowing tube and comprises a connecting bar connected to the bottom wall of the fluid flowing tube and the bottom plate of the guide member.