Two-stage double-flow autotrophic denitrification biofilter

Abstract

The invention discloses a two-stage double-flow autotrophic denitrification biofilter. The biofilter comprises a reactor body, and a sleeve and a filler arranged in the reactor, wherein the reactor body is provided with, from bottom to top, a backflow water-distribution unit, a mud discharge unit, an autotrophic denitrification unit, a three-phase separation unit, and water outlet and air-exhausting units; the backflow water-distribution unit is provided with a conical water distributor and an aeration tray; the mud discharge unit is provided with a mud outlet at the left side of the bottom end of the reactor body; the autotrophic denitrification unit is divided by the sleeve into an outer filter and an inner filter which are upward-and-downward communicated, and the interiors of the filters are filled with the filler; the three-phase separation unit is provided with a conical guide plate, a hemispherical air-collecting hood, an air outlet and an overflow weir; and the water outlet unit comprises a water outlet groove and a water outlet. The invention has the following beneficial effects: a novel pneumatic design is adopted, and the two filters can be independently switched between micro-aerobic and anaerobic environments and between flow rising and flow falling modes, so falling-off and renewal of biological membranes are accelerated and the problem of blockage of the filler is effectively overcome; and a two-stage internal-circulation system is arranged, so strong shock load resistibility and good denitrification effect are obtained.

Description

technical field [0001] The invention relates to a two-stage double-flow autotrophic denitrification biofilter. Background technique [0002] In recent years, excessive discharge of ammonia-containing wastewater has caused a series of ecological and environmental problems such as eutrophication of water bodies. The high-efficiency and low-consumption treatment of ammonia-containing wastewater has always been a difficult problem and a hot spot in the field of sewage treatment. [0003] Whole-process autotrophic denitrification has the advantages of high denitrification load, low infrastructure cost, compact structure, simple device operation and control, and can effectively avoid inhibition caused by high-concentration nitrite accumulation. However, there are several prominent problems as follows: (1) Sequencing batch reactors are mostly used in the previous fully autotrophic denitrification reactors, the reactors start up for a long time, and the bacterial loss is serious; a...

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Problems solved by technology

However, there are several prominent problems as follows: (1) Sequencing batch reactors are mostly used in the previous fully autotrophic denitrification reactors, the reactors start up for a long time, and the bacterial loss is serious; after the start-up is successful, the shock load resistance is weak; (2) The biological filter can effectively retain the bacteria, the treatment effect is good and the impact load is strong, but the bottom of the upflow biological filter is easy to be blocked, the sludge concentration is unevenly distributed along the height, less at the top and more at the bottom, and the upper filter material cannot Being fully utilized affects operating performance, while downflow biofilters are not prone to clogging, but have low biomass; (3) Usually biofilters need to stop running during backwashing, which is time-consuming and energy-consuming

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