Combined biological turntable reactor for implementing one-step autotrophic nitrogen removal process

Abstract

The invention discloses a combined biological turntable reactor for implementing a one-step autotrophic nitrogen removal process. A plurality of biological discs, an aeration device and an inner heating device are arranged in a reaction container; and water outlets are arranged on the wall of the reaction container. A cylindrical net is arranged between two adjacent discs, the cylindrical nets are fixed on the discs, and a rotating shaft sleeve penetrates through the centers of all the discs and the cylindrical nets. Each disc is made of macromolecular plastic and is wrapped by a non-woven fabric layer; and a biological film protective net is arranged at each of the two ends in each cylindrical net. A plurality of water outlets are positioned at different heights of the wall of the reaction container; and a reactor cover capable of being opened and closed is arranged on the top of the reaction container, and a gas collecting device and a dissolved oxygen control hole are arranged on the reactor cover. According to the reactor, the film forming periods of the discs and a filler are short, the attachment performance of the filler is good, the matrix in the reactor is mixed uniformly, and the mass transfer effect is good; and dissolved oxygen in the reactor is easy to control, the nitrogen removal performance of the reactor is enhanced, and the running cost and the energy consumption are reduced.

Description

technical field [0001] The invention relates to the improvement of a single-stage autotrophic denitrification process, in particular to a biological turntable reactor that realizes the single-stage autotrophic denitrification process by combining non-woven fabric wrapping and biological carrier filler filling, which belongs to environmental protection and water treatment equipment technology field. [0002] Background technique [0003] With the rapid development of industry and agriculture, a large number of nitrogen-containing compounds are discharged into water bodies, resulting in aggravated eutrophication of water bodies, and the removal of ammonia nitrogen in wastewater has attracted widespread attention. The traditional full nitrification-denitrification biological denitrification process mainly converts ammonia nitrogen in wastewater into nitrite nitrogen through nitrifying bacteria, and then the nitrifying bacteria further converts nitrite nitrogen into nitrate nit...

AI Technical Summary

Problems solved by technology

At present, the commonly used disc materials at home and abroad include corrugated plastic plates, glass steel plates, stainless steel, foam plastics, etc. In practical applications, most of these discs show a single disc shape, small specific surface area, poor film-hanging performance, and poor performance per unit volume. The disadvantages such as less biomass, low treatment efficiency, and short service life seriously affect the treatment efficiency of the biological turntable.

Due to the slow growth of AAOB and the harsh growth conditions, the discs of the biological turntable are required to have strong bio-adhesion ability. The specific surface area has a large amount of biofilm, so the bio-rotary disk reactors that choose the above materials to make disks are not suitable for operating single-stage autotrophic denitrification process

The optimal growth temperature of AAOB is 30~43°C, which requires that the reactor operating the single-stage autotrophic denitrification process has a device that is easy to control the temperature; the control of DO also affects the denitrification of the reactor operating the single-stage autotrophic denitrification process A key factor of efficiency, a trace amount of oxygen (<0.5g / L) has a reversible inhibitory effect on AAOB, especially in the ANAMMOX stage, an anaerobic environment suitable for AAOB growth must be ensured, while ordinary biological turntables do not have temperature and oxygen regulation The device is not suitable for operating a single-stage autotrophic denitrification process

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