Duplex oxidation ditch sewage treatment method

Abstract

The invention provides a duplex oxidation ditch sewage treatment method. The duplex oxidation ditch sewage treatment method comprises an anaerobic zone, a duplex oxidation ditch, a secondary sedimentation tank and other process units. A reaction tank of the duplex oxidation ditch is divided into upper layer reaction tanks and lower layer reaction tanks which are connected end to end through a pipeline, and the bottom layer reaction tank and the uppermost layer reaction tank are connected end to end through a circulating pump and a circulating pipeline, so that each layer reaction tank is arranged in a closed terminal-free circulating channel shape, and oxygenation and flow pushing are realized in the duplex type oxidation ditch; the water level of the secondary sedimentation tank is lower than that of the top layer reaction tank but higher than that of the anaerobic zone; sewage enters from the anaerobic zone and is supplied to the head end of the top-layer reaction tank by the circulating pump, oxygenation is completed, and a circulating flow is formed; sludge at the bottom of the secondary sedimentation tank siphons and automatically flows back to the anaerobic zone; and the circulating pump is automatically started and stopped according to the water level fluctuation of the anaerobic zone. And a filter is also arranged, a filter tank performs automatic siphon backwashing, and backwashing water is discharged into the anaerobic zone or the low layer reaction tanks, so that the zero-emission and zero-power filter tank is formed. If a double-filtering integrated filter with a slow filtering function is adopted, the first level B can be upgraded to the first level A.

Description

Technical field: [0001] The invention relates to a method for treating sewage in a jump-type oxidation ditch, which belongs to the field of water treatment. Background technique: [0002] According to the definition of the national environmental protection standard HJ-578-2010, the oxidation ditch activated sludge method refers to the activated sludge sewage treatment method in which the reaction tank is arranged in the shape of a closed endless circulation flow channel, and oxygenation and push flow are completed in the pool. , referred to as oxidation ditch method or OD method. Unlike the AAO method, which clearly distinguishes the anoxic zone and the aerobic zone, the oxidation ditch method concentrates aerobic and anoxic (even anaerobic and precipitation) in the reaction tank to complete. There are also many variants of the oxidation ditch method. [0003] The oxidation ditch methods that have been put into production are basically large and medium-sized sewage treatme...

AI Technical Summary

Problems solved by technology

If the reaction pool cycle time of the oxidation ditch is calculated as 10 minutes, the required length of the reaction pool should be at least 10*60*0.3=180 meters! These greatly limit the scope of use of the oxidation ditch, making it very difficult to equipment and even more difficult to miniaturize

Images