Method for fast starting H. hydrossis dominant filamentous fungus sludge slight expansion under condition of low C/N ratio domestic sewage

Abstract

The invention discloses a method for fast starting H. hydrossis dominant filamentous fungus sludge slight expansion under the condition of low C / N ratio domestic sewage and relates to the field of sewage biological treatment. The reactor structure is characterized in that a volume ratio of an anoxic zone to an aerobic zone is 1: 1.5-1.2.0, the anoxic zone is divided into 1-2 grids and the aerobic zone is divided into 2-3 grids. Domestic sewage enters into the anoxic zone, then is fed into the aerobic zone, then is fed into a secondary sedimentation tank from the last grid of the aerobic zone and then is subjected to sludge-water separation, and the supernatant is discharge finally. The method comprises two cycles of sludge reflux (comprising that the settling sludge in the secondary sedimentation tank is refluxed to the first grid of the anoxic zone according to a reflux ratio of 80-120%) and inner reflux (comprising that a nitrated liquid is refluxed to the first grid of the anoxic zone from the last grid of the aerobic zone according to a reflux ratio of 120-180%). The method utilizes the low C / N ratio domestic sewage as inlet water, realizes fast starting of H. hydrossis dominant filamentous fungus sludge slight expansion, improves synchronous nitrification-denitrification and shortcut nitrification of the system, improves pollutant removal effects and saves aeration energy consumption.

Description

technical field [0001] The invention relates to the field of sewage biological treatment, and provides a device and method for quickly starting the micro-expansion of filamentous fungus sludge with H. Hydrossis is the micro-expansion state of the sludge of dominant filamentous bacteria, which improves the removal effect of system pollutants, saves aeration energy consumption, and provides a quick start-up scheme for energy saving and consumption reduction for actual sewage treatment plants. Background technique [0002] The problem of sludge bulking has always been one of the problems of urban sewage treatment plants using activated sludge method to treat sewage, and it will lead to system collapse in severe cases. Due to the complex and changeable factors that cause sludge bulking, there are many kinds of filamentous bacteria in sludge bulking, and it is difficult to isolate and purely cultivate them, resulting in less research on the physiological characteristics of variou...

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Problems solved by technology

[0002] The problem of sludge bulking has always been one of the problems of urban sewage treatment plants that use activated sludge to treat sewage, and it will lead to system collapse in severe cases

At home and abroad, there are few studies on sludge bulking treatment by adjusting the species and quantity of filamentous bacteria by using the physiological characteristics of filamentous bacteria. Physiological properties can precisely control the micro-expansion state of sludge, so as to achieve energy saving and improve the quality of effluent water

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