Dual-sludge denitrification dephosphorizing and denitrifying A/A-O device and method

Abstract

The invention discloses a dual-sludge denitrification dephosphorizing and denitrifying A / A-O device which mainly comprises a primary precipitation pool, an anaerobic-anoxic device, a secondary precipitation pool, a middle pool, a biological aerated filter and a clear water pool, wherein the primary precipitation pool is connected with an anaerobic zone of the anaerobic-anoxic device, a degassing zone of the anaerobic-anoxic device is connected with the secondary precipitation pool, and the secondary precipitation pool is connected with the anaerobic zone of the anaerobic-anoxic device througha sludge pump; the outflow water of the secondary precipitation pool is connected to the middle pool, the middle pool is connected with the biological aerated filter, and the biological aerated filter is connected with the clear water pool; and the clear water pool is connected with the anaerobic-anoxic device. By the process adjustment, denitrifying phosphorus accumulating bacteria becomes dominant bacteria of an AAO unit. The dual-sludge denitrification dephosphorizing and denitrifying A / A-O device realizes the separation of phosphorus accumulating bacteria and nitrobacteria, the separationof the precipitation function and the sludge storage function of the secondary precipitation pool, and the separation of the nitrification function and the filtering function of the biological aerated filter, thereby realizing energy conservation of a combined system, stability and efficiency in denitrification and dephosphorization, 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 in particular relates to an A / A-O device and method for enhanced denitrification of sewage treatment. 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 operating cost per ton of water i...

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