Abstract: An integrated oxidation ditch comprises a number of oval channels. There are two or more circular zones in the central island of the oxidation ditch, wherein, the two circular zones are tangential to the inner wall or share the inner wall with an adjacent channel. Wastewater of different zones is connected with others. The center island is used sufficiently in the oxidation ditch and all the channels and the deposition zone or the deposition zone and an anaerobic zone, inner/outer re-circulation zone are integrated together. So the oxidation ditch improves space utilization efficiency and reduces the land and cost.

Abstract: The integrated Orbal oxidation ditch, pertaining to water treatment technical field, comprises several ellipse oxidation ditches whose central island position is arranged with two or more round areas. Wherein, two round areas are tangential to or share the wall with the inner wall of the neighbouring oxidation ditch. The process water of various areas is connected with each other. Taking full advantage of the central island position of the traditional Orbal oxidation ditch, present practical and new invention introduces deposition area or deposition area and anaerobic area as well as inner/outer re-circulation zone, making the overall equipment layout of the oxidation ditch be more harmonious and reasonable, space use rate be high, area occupied be less and civil work expenses be lower.

Abstract: A high denitrification shared type Orbal oxidation ditch, pertaining to water treatment technical field, comprises an outer channel, a median channel, an inner channel, all of ellipse, and a secondary deposition tank. Wherein, the length of the outer channel is prolonged in the ellipse's major axis direction and the secondary deposition tank that is tangential to the inner wall or shares the wall with the outer channel is arranged between the outer and median channels. All the channels (the outer channel, the median channel and the inner channel) and the secondary deposition tank are integrated in the Orbal oxidation ditch, all of the anaerobic zone, regulation zone, hydrolysis acidifying zone, primary deposition zone, sludge outer re-circulation zone and wastewater inner re-circulation zone etc.

Abstract: A high denitrification shared type Orbal oxidation ditch, pertaining to water treatment technical field, comprises an outer channel, a median channel, an inner channel, all of ellipse, and a secondary deposition tank. Wherein, the length of the outer channel is prolonged in the ellipse's major axis direction and the secondary deposition tank that is tangential to the inner wall or shares the wall with the outer channel is arranged between the outer and median channels. All the channels (the outer channel, the median channel and the inner channel) and the secondary deposition tank are integrated in the Orbal oxidation ditch, all of the anaerobic zone, regulation zone, hydrolysis acidifying zone, primary deposition zone, sludge outer re-circulation zone and wastewater inner re-circulation zone etc.