Sewage treatment device and method for enhanced denitrification A/A/O (Anodic Aluminum Oxide) and deoxygenation BAF (Biological Aerated Filter)

Abstract

The invention discloses a sewage treatment device for an enhanced denitrification A / A / O (Anodic Aluminum Oxide) and a deoxygenation biological aerated filter. The sewage treatment device mainly comprises a sludge denitration pool, an AAO denitrification and dephosphorization device, a settling pond and the deoxygenation biological aerated filter, wherein a water inlet pipe is respectively connected to anaerobic zones of the sludge denitration pool and the AAO denitrification and dephosphorization device; the sludge denitration pool is connected with the anaerobic zone of the AAO denitrification and dephosphorization device; the aerobic zone of the AAO denitrification and dephosphorization device is connected with the settling pond; and the settling pond is connected with the sludge denitration pool and connected to the deoxygenation biological aerated filter. A sewage treatment method comprises the following steps of: performing denitrification and dephosphorization on sewage through the sludge denitration pool and the AAO denitrification and dephosphorization device to remove COD (Chemical of Demand); converting ammonia nitrogen into nitrate nitrogen through the deoxygenation biological aerated filter; and supplying an electron acceptor to the AAO device, and removing COD, N, P and SS. The sewage treatment device has the advantages of energy saving, stability, high denitrification and dephosphorization efficiency and sludge reduction.

Description

technical field [0001] The invention belongs to the technical field of sewage biological treatment, and is particularly suitable for upgrading sewage treatment plants and building new sewage advanced treatment plants, and specifically relates to an A / A / O and deoxygenation BAF device for strengthening denitrification in sewage treatment with method. Background technique [0002] At present, more than 95% of sewage treatment plants in my country cannot meet the increasingly stringent Class A discharge standards. The key problem is that TN, TP and SS cannot meet the standards stably. Since the C / N of urban sewage in my country is generally low, and the VFA that can be used for anaerobic phosphorus release is even lower, a large amount of additional carbon sources need to be added in the process of biological nitrogen and phosphorus removal, and sewage plants have not adopted energy-saving and consumption-reducing technologies. The operating cost is generally high, and the opera...

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Problems solved by technology

However, there are still some problems in this combined process, such as the high DO in BAF effluent, the multiplication of aerobic heterotrophic bacteria in the anoxic zone, which restricts the efficiency of AAO denitrification and phosphorus removal; the pollutants intercepted by upward flow BAF are mainly in the lower part of the filter layer The intercepted pollutants pass through the entire filter material layer during recoil, which not only consumes high energy but also pollutes the clear water above the BAF; the filtration performance of the BAF is weakened due to the interference of aeration, and the SS of the effluent is relatively high due to the shedding biofilm. high

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