Anoxic expanded bed device and method for treating high-concentration nitrate wastewater

Abstract

The invention discloses an anoxic expanded bed device and a method for treating wastewater. The problem of uneven water inlet distribution of an anoxic expanded bed is effectively solved, water flow short circuit is avoided, and organic matter and nitrate removal load is increased. A water and gas distribution distributor is arranged at the top of the anoxic expanded bed, so that biological fillers in the anoxic expanded bed are effectively prevented from being discharged out of a circulating system, and the circulating system stably runs for a long time. The anoxic fluidized bed is large in height-diameter ratio, small in occupied area, high in sewage treatment efficiency, high in impact resistance, short in residence time, easy and convenient to operate, high in economic benefit and widein application prospect.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and environmental protection, and relates to an anoxic expanded bed device and a method for treating high-concentration nitrate wastewater. Background technique [0002] How to remove nitrate nitrogen from water economically, efficiently and safely, and develop an efficient and stable sewage enhanced denitrification technology has become an urgent technical demand in the field of sewage treatment. [0003] Today's sewage treatment is faced with high standard discharge requirements, such as the United States, Canada and other countries, the effluent standard TN is less than 3mg / L and TP is less than 0.18mg / L. At present, the processes commonly used for denitrification and denitrification of sewage include activated sludge process, suspended packing biofilm process and biological filter. The activated sludge method has low sludge concentration and cannot handle high-load sewage, and the s...

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Problems solved by technology

[0004] Purpose of the present invention: First, in order to solve the clogging of the traditional upward flow water distribution device of anoxic expanded bed (AEB), improve the uniformity of water distribution and increase the effective utilization rate of the expanded bed volume, provide an aeration bed The special long-handled filter head of the gas biofilter can effectively prevent clogging; secondly, in order to avoid the loss of filler during the backwashing process and to solve the problem that some biological fillers are mixed into the circulation pipeline, causing pipeline clogging or even damage to the pump head, A row of long-handle filter heads is added to the middle and upper part of the reactor, which can completely isolate the circulating water outlet pipeline from the biological filler, and realize the long-term stable automatic operation mode of the system

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