초록 ▼

A sewage treatment simultaneously treats raw sewage and transports the effluent to a location where the treated effluent can be economically reused. The system converts raw sewage to primary effluent, and the solids in the primary effluent are transported to an aerobic sludge activator which convert

A sewage treatment simultaneously treats raw sewage and transports the effluent to a location where the treated effluent can be economically reused. The system converts raw sewage to primary effluent, and the solids in the primary effluent are transported to an aerobic sludge activator which converts the solids to activated sludge. The remaining primary effluent is mixed with the activated sludge and pumped up a pressure pipe treatment line which is preferably an upwardly inclined conduit at least 1000 feet long. Air or oxygen is injected into the treatment line downstream of the pump so that oxygen is dissolved at a relatively high pressure and in a sufficient amount to meet the biological oxygen demand (BOD) of the organic matter in the sewage. By the time the sewage reaches the outlet end of the line it contains substantially completely treated water and activated sludge. Trunk sewers collect raw sewage and transport it by gravity to a headworks facility. Some of the waste water in the raw sewage is intercepted in the trunk sewer system, and is pumped into the pressure pipe treatment line. The remaining portion of the solids and waste water in the trunk sewer system are sent to the headworks. This reduces considerably the required hydraulic capacity of the trunk sewers, the primary treatment facility, and the pressure pipe treatment line, and eliminates almost completely the conventional secondary treatment facility. Activated sludge is removed from the pressure pipe treatment line and returned through the trunk sewers to the downstream sewage treatment facility to insure an adequate supply of activated sludge for continued treatment and for meeting the varying conditions in the raw sewage. After substantial reduction of the sewage BOD, the treated sewage or effluent is maintained under anaerobic conditions to encourage bacteria to denitrify the effluent.

대표청구항 ▼

A system for simultaneously treating and transporting raw liquid waste material from a point of collection to a location where treated effluent from the raw waste material can be economically used, the system comprising an elongated pressure pipe treatment line having an inlet end and an outlet end,

A system for simultaneously treating and transporting raw liquid waste material from a point of collection to a location where treated effluent from the raw waste material can be economically used, the system comprising an elongated pressure pipe treatment line having an inlet end and an outlet end, the pressure pipe treatment line being inclined upwardly toward its outlet end so the static head of the waste material in the pressure pipe treatment line due to the difference in elevation between the inlet and outlet of the pressure pipe treatment line is at least several atmospheres; a pump having an inlet to receive raw waste and an outlet connected to the pressure pipe treatment line inlet for delivering the raw waste material under a pressure of at least several times atmospheric to the inlet end of the pressure pipe treatment line and producing a sufficiently high pressure at the inlet end of the pressure pipe treatment line to force the raw waste material toward the outlet end of the pressure pipe treatment line; means for injecting oxygen under a pressure of at least several atmospheres into the raw waste material at the high pressure end of the pressure pipe treatment line so the oxygen substantially reduces the biological oxygen demand of the raw waste material; and means at the outlet end of the pressure pipe treatment line for withdrawing the treated waste material. A method of delivering raw waste material from a downwardly extending trunk sewer pipe to a sewage treatment plant at the lower end of an upwardly inclined elongated pressure pipe treatment line for treatment of the raw waste material, the raw waste material including waste water and raw sewage solids, the method comprising the steps of removing a portion of the waste water from the raw waste material at a point upstream of the lower end of the trunk sewer pipe; delivering the remaining waste water and the raw sewage solids via the trunk sewer to the headworks; converting at least a portion of the raw sewage solids to activated sludge; delivering the activated sludge and the remaining waste water to the lower end of the pressure pipe treatment line at a sufficiently high pressure to force the activated sludge and waste water up the pressure pipe treatment line; injecting the removed portion of the waste water into the activated sludge and waste water flowing up the pressure pipe treatment line at a point spaced from the lower end of the pressure pipe treatment line; injecting a sufficient amount of oxygen under pressure into the activated sludge and waste water in the pressure pipe treatment line such that the oxygen substantially reduces the biological oxygen demand of the waste material in the pressure pipe treatment line; and withdrawing the treated waste material from the upper end of the pressure pipe treatment line.