A<2>/O-biology synchronous nitrogen and phosphorus removal device and method for urban sewage

Abstract

The invention discloses an A<2> / O-biology synchronous nitrogen and phosphorus removal device for urban sewage. The device comprises a pre-anoxic pond, an anaerobic pond, an anoxic pond, an aerobic pond and a settling pond; the urban sewage is conveyed to the pre-anoxic pond and the anaerobic pond through a water inlet, a sewage lifting pump room with a coarse grille and a fine grille, an aeration grit basin, a water pump and a water inlet pipe; the interior of the pre-anoxic pond, the interior of the anaerobic pond and the interior of the anoxic pond are each provided with a submersible stirrer, the bottom of the aerobic pond is provided with an aerator, the aerobic pond is connected with the anaerobic pond through a nitration mixing reflux pipeline, the anoxic pond is connected with the anaerobic pond through an anoxic mixing reflux pipeline, one part of sludge at the bottom of the settling pond is conveyed to a sludge concentrating and dewatering room, and the other part of the sludge at the bottom of the settling pond is connected with the pre-anoxic pond through a reflux sludge pipeline. The invention further discloses an A<2> / O-biology synchronous nitrogen and phosphorus removal method for the urban sewage. According to the A<2> / O-biology synchronous nitrogen and phosphorus removal device and method for the urban sewage, the influence of nitrate on the anaerobic phosphorus releasing process is reduced or eliminated, the carbon source demands for anoxic denitrification nitrogen removing and anaerobic phosphate releasing are balanced, and the efficient nitrogen and phosphorus removal effects are achieved.

Description

technical field [0001] The invention relates to waste water treatment technology, in particular to a kind of urban sewage improvement A 2 / O- Biological synchronous nitrogen and phosphorus removal device and method. Background technique [0002] In the existing sewage and wastewater biological treatment process, the removal of nitrogen and phosphorus is much more complicated than the removal of carbon, which involves nitrogen nitrification, denitrification, microbial phosphorus release and phosphorus absorption, etc. The process of each of the above processes The purpose is different, and the requirements for microbial composition, matrix type and environmental conditions are also different. How to organically combine various appropriate reaction conditions in a water treatment device is an important topic. [0003] Since Wuhrmann established the post-denitrification process to remove nitrogen in urban sewage in 1932 using microbial endogenous sources, after more than half...

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Problems solved by technology

[0004] The A2 / O process consists of anaerobic zone, anoxic zone, aerobic zone, sedimentation zone and two reflux systems. Its functions are anaerobic phosphorus release, anoxic denitrification denitrification, and aerobic nitrification phosphorus absorption. After the sludge and water are separated, the remaining sludge is discharged to remove phosphorus. The conventional A2 / O process has the following disadvantages: 1. Since the anaerobic zone is in the front, the nitrate in the returning sludge will have an adverse effect on the anaerobic zone, affecting the phosphorus removal of the system 2. Since the anoxic zone is located in the middle of the system, denitrification is in a disadvantageous position in the distribution of carbon sources, thus affecting the denitrification effect of the system; 3. Due to the existence of internal circulation, the remaining sludge discharged from the conventional process system is actually Only a small part has gone through the complete phosphorus release and phosphorus uptake process, and the rest basically enter the aerobic zone directly from the anoxic zone without anaerobic state, which is unfavorable to the system phosphorus removal

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