Adjustable biochemical tank and adjustable AAO process for water treatment

Abstract

The invention discloses an adjustable biochemical tank and an adjustable AAO process for water treatment. The adjustable biochemical tank is characterized in that: the two sides of a water intake pipe are respectively provided with an oxygen deficiency pond, an anaerobic pond and an aerobic pond, wherein, the oxygen deficiency pond and the anaerobic pond are vertically arranged between the aerobic pond and the water intake pipe side by side, and the oxygen deficiency pond and the anaerobic pond are next to the water intake pipe; the water intake pipe is communicated with the oxygen deficiencyponds and the anaerobic ponds which are arranged on the two sides through a weir gate I and a weir gate II, the oxygen deficiency pond is communicated with the anaerobic pond through a hole, and the anaerobic pond and the oxygen deficiency pond are respectively communicated with the aerobic pond through a gate I and a gate II; and between the aerobic pond and the oxygen deficiency pond is provided with a digestive juice reflux pump, and blenders are respectively arranged in anaerobic pond and the oxygen deficiency pond. According to the invention, the designed structure is reasonable and compact, the proper process can be selected according to the water quality, the effects of dephosphorization and denitrification, the efficiency of water treatment and utilization rate of the device can be improved, the cost can be saved, and the occupied area can be reduced.

Description

technical field [0001] The invention belongs to the field of environmental engineering, and in particular relates to an adjustable biochemical pool and an adjustable AAO process for water treatment thereof. Background technique [0002] At present, the biological nitrogen and phosphorus removal process in urban sewage treatment mainly consists of the following types: [0003] 1. Traditional AAO process: The traditional AAO process is a typical phosphorus and nitrogen removal process. Its biological reaction tank consists of three sections: ANAEROBIC (anaerobic), ANOXIC (anoxic) and OXIC (aerobic). A plug-flow pre-degradation BNR process, which is characterized by three stages of anaerobic, anoxic and aerobic stages with clear functions and clear boundaries, and can artificially create and control the time and space of the three stages according to the water inlet conditions and water outlet requirements Ratio and operating conditions, as long as the carbon source is suffici...

AI Technical Summary

Problems solved by technology

The traditional AAO process has the following three disadvantages: (1) Since the anaerobic zone is in the front, nitrate in the return sludge has an adverse effect on the anaerobic zone; (2) Since the anoxic zone is located in the middle of the system, backdigestion is in the distribution of carbon sources (3) Due to the existence of internal circulation, only a small part of the excess sludge discharged from the conventional process system has actually experienced a complete process of phosphorus release and phosphorus absorption, while the rest Basically, it enters the aerobic zone directly from the anoxic zone without anaerobic state, which is unfavorable for the system phosphorus removal

2. For denitrification: (1) The anoxic stage is advanced, that is, more direct carbon sources are supplied to denitrifying bacteria instead of PAOs, which is beneficial to denitrification; in traditional AAO, denitrifying bacteria can only use the remaining PAOs residual organic carbon source

[0006] Disadvantages of the inverted AAO process: (1) If it is aimed at nitrogen removal, its reflux ratio cannot be effectively improved; if it is aimed at phosphorus removal, it cannot supply too much carbon source to PAOs

Two contradictions predetermine that this process can only be applied to occasions with lower requirements for nitrogen and phosphorus

(2) Combining the external backflow and the internal backflow into one is a good starting point, but the backflow ratio cannot be opened much larger due to the limitation of the sedimentation tank

[0008] The above three processes have their own advantages and disadvantages, and different water quality can be treated with different processes according to the needs.

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