Device and method for treating domestic wastewater through sectioned water output shortcut nitrification-Anammox/denitrification

Abstract

The invention discloses a device and method for treating domestic wastewater through sectioned water output shortcut nitrification-Anammox / denitrification and belongs to the field of wastewater treatment. The device is provided with a raw water tank, a shortcut nitrification reactor, a first middle water tank, a second middle water tank and an Anammox / denitrification bio-membrane reactor. The method comprises the steps that domestic wastewater enters the shortcut nitrification reactor, anaerobic stirring and denitrification are performed firstly to remove nitrite nitrogen left in a previous period, and 1 / 3 of drained water provides ammonia nitrogen for anaerobic ammonia oxidation reaction; anaerobic stirring is performed to release phosphorus, then shortcut nitrification and aerobiotic phosphorus absorbing are performed through aeration, and 1 / 3 of secondarily drained water provides nitrite nitrogen for anaerobic ammonia oxidation reaction; denitrifying bacteria utilize a raw water carbon source in the primarily drained water to reduce nitrate nitrogen produced through the anaerobic ammonia oxidation reaction into nitrogen. The coupling between anaerobic ammonium oxidation bacteria and the denitrifying bacteria is achieved by utilizing a bio-membrane, the raw water carbon source of sectioned output water is fully utilized, simultaneous phosphorus and nitrogen removal of the domestic wastewater at low carbon nitrogen ratio is achieved, energy is saved, the consumption is reduced, and sludge yield is small.

Description

technical field [0001] The invention relates to a device and method for subsection short-range nitrification-Anammox / denitrification treatment of domestic sewage, and belongs to the technical field of sewage biological denitrification and phosphorus removal. The domestic sewage enters the short-range nitrification reactor, first anaerobic stirring and denitrification to remove the remaining nitrite nitrogen in the previous cycle, and 1 / 3 of the drainage provides ammonia nitrogen for the anaerobic ammonium oxidation reaction; then anaerobic stirring to release phosphorus, followed by aeration for short-range nitrification and aerobic phosphorus absorption, 1 / 3 of the secondary drainage provides nitrite nitrogen for the anammox reaction; denitrifying bacteria use the raw water carbon source in the first drainage to reduce the nitrate nitrogen produced by the anammox reaction to nitrogen. The short-path nitrification reactor adopts the operation mode of anoxic-anaerobic-aerobic,...

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Problems solved by technology

[0005] In traditional UASB reactors, the hydraulic conditions of upwelling are easy to cause the loss of anammox bacteria and affect the reaction effect, while biofilm reactors can not only effectively retain sludge, enrich anammox bacteria, but also can A good anaerobic environment is formed inside to provide conditions conducive to the growth of anammox bacteria

At present, the common problem is that the concentration of nitrate nitrogen in the effluent is very high, and the total nitrogen is difficult to reach the standard. The coupling of anammox and denitrification is realized in the form of biofilm, and some organic matter in the raw water is fully used as a carbon source to denitrify nitrate nitrogen. for nitrogen, thus solving the problem

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