Liquid purification or separation – Processes – Treatment by living organism
Patent
1984-06-22
1986-01-07
Wyse, Thomas
Liquid purification or separation
Processes
Treatment by living organism
210621, 210151, 2101951, C02F 308
Patent
active
045632820
ABSTRACT:
A method and apparatus for increasing the capacity of an activated sludge wastewater treatment plant which utilizes microscreens in conjunction with rotating biological contactors that are placed in the primary settling tank, the aeration tank and the final clarification tank. A rotatable microscreen is placed upstream of the primary settling tank and downstream of the final clarification tank. The result is a more efficient and less energy consuming system which reduces the organic loads. Preferably, the microscreening preceding the biological treatment stage will have a mesh size in the range of about 50-200 mesh and the microscreen placed after the biological treatment stage will have a mesh size in the range of 6-44 microns. Additional benefits are obtained in recycling the treated water which is passed through the rotating biological contactor as well as utilizing it to aid in rotating the contactor. Another advantage of the system of this invention is that it can be readily adapted to an existing wastewater treatment plant in order to upgrade its capacity without substantially increasing capital investment and is adaptable to a new facility with benefits at low energy consumption and minimal land requirement.
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Pak-Shine Cheung et al., "Investigation to Replace the Conventional Sedimentation Tank by a Microstrainer in the Rotating Disc System", Water Research, vol. 14, pp. 67-75.
Davie Richard L.
Mooers Douglas F.
Winkelman Robert C.
Wittmann John W.
Crain Lawrence J.
Envirex Inc.
Wyse Thomas
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