High-efficiency autotrophic denitrification system and operation method for treating high-ammonia nitrogen wastewater

Abstract

The invention discloses an efficient autotrophic nitrogen removal system used for treating high-ammonia nitrogen wastewater and an operation method, and belongs to the technical field of wastewater biological nitrogen removal. The problems are solved that in the prior art, a related system needs to occupy a large land, the inoculation amount is too large, starting time is long, the nitrogen removal load is low, impact resistance is poor, and the system is easily affected by water-entering organic matter. Pure film denitrificaiton is combined with mud film one-part form autotrophic nitrogen removal, a denitrification pond is arranged in the front, an autotrophic nitrogen removal pond is arranged in the rear, and outgoing water returns. Three operation modes of the rapid starting method canbe realized and include the parallel operation mode, the double-series A operation mode and the double-series B operation mode, the water outlet direction of four reaction ponds is controlled througha communication valve, and therefore the reaction ponds are connected in series or in parallel or operate independently; by means of inoculation, fed-batch and others, rapid starting of the technologyis realized; according to treatment requirements, different technological arrangement modes are realized. The efficient autotrophic nitrogen removal system has the advantages that occupied land is small, the inoculation proportion is small, starting is rapid, the nitrogen removal load is high, the impact resistance is high, and resistance to water-entering organic matter is good.

Description

technical field [0001] The invention belongs to the technical field of waste water biological denitrification, and in particular relates to an efficient autotrophic denitrification system and an operation method for treating high ammonia nitrogen waste water. Background technique [0002] As a new denitrification process that has developed rapidly in recent years, autotrophic denitrification technology has attracted the attention of researchers in the field of wastewater biological denitrification all over the world. Compared with traditional nitrification and denitrification, this process can save 62.5% of oxygen supply energy consumption and 100% Therefore, it is considered to be the most economical and effective way of biological denitrification of wastewater. In the one-stage autotrophic denitrification process, nitrite oxidizing bacteria (AOB) and anaerobic ammonium oxidizing bacteria (AnAOB) are enriched in the same reactor by limiting oxygen, and efficient denitrifica...

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Problems solved by technology

Although the inoculation rate of this technology is low and the startup time is fast, the NH removed by the system in the stable phase 4 + -N and generated NO 3 - The ratio of -N is 8%-15%, which has a certain gap with the chemical ratio (11%). Generally speaking, the system feed water contains a certain amount of BOD 5 It will lead to the occurrence of denitrification phenomenon and cause the ratio to be too small, and the existence of certain nitrite oxidizing bacteria (NOB) in the system will make the ratio too large. It is worth noting that the existence of NOB will compete with AnAOB for nitrous acid The salt matrix makes AnAOB lack a suitable matrix ratio, causing the system to collapse; in addition, the high concentration of ammonia nitrogen in the influent water used by this technology and the large amount of water lead to a high total nitrogen removal load, but the concentration of ammonia nitrogen in the effluent still reaches about 150 mg / L, which cannot be approached. High treatment requirements. In addition, this process has no nitrate nitrogen treatment step, which cannot solve the total nitrogen in the effluent. For projects with high requirements for total nitrogen in the effluent, other processes need to continue to process

[0010] CN108083581A discloses a low-energy autotrophic denitrification municipal sewage treatment system and method, which adopts the form of serial anaerobic decarburization-autotrophic denitrification to first inoculate the residual sludge of the sewage treatment plant to start the anaerobic carbon removal reactor, and the anaerobic decarbonization reactor involved The start-up process of the oxygen decarbonization reactor takes 60-90 days, and the subsequent start-up process of the autotrophic denitrification reactor needs to inoculate the whole pool with 3000 mg / L anammox sludge for early anaerobic start-up, and artificially distribute water to meet the anaerobic requirements. Ammonia oxidizing bacteria substrate requirements, the reactor start-up process takes 90-120 days, and the whole process starts up 150-210 days. The pre-anaerobic decarbonization tank of this method uses a sludge system, and it is easy for the sludge to enter the post-treatment system after long-term operation. It affects the whole process, and sludge bulking is prone to occur. In addition, this method requires too much anammox bacteria, making inoculation difficult and difficult to achieve long-term large-scale expansion of multiple projects. The manual water distribution in the early stage was successfully started. There is a certain risk of whether the anammox strains can adapt to the actual wastewater

This method also has too much demand for provenance microbial biomass, which is difficult to meet the start-up of large-scale engineering projects, and the start-up process is water distribution operation, so it is impossible to predict whether the cultivated autotrophic denitrification functional microorganisms can use the actual engineering water quality, and the sponge filler can be used in actual projects. It is easy to wear during operation, and when the biofilm forms a certain thickness, it is prone to clogging, which affects mass transfer or the filler becomes heavy and hinders fluidization.

[0012] CN106630143 discloses an integrated reactor and denitrification method for pre-denitrification complete autotrophic denitrification, and the reactor it adopts is equipped with aerobic zone, anoxic zone and anaerobic zone to respectively cultivate nitrosating bacteria and short-range denitrification Bacteria and anaerobic ammonium oxidizing bacteria, through the airlift device, the experimental mixture is refluxed, and the short-range denitrification is used to control the step of converting nitrate nitrogen into nitrous nitrogen in the reflux, which has high requirements for water quality, excessive COD of influent water or too long hydraulic retention time It can cause denitrification to destroy the balance of the reactor. Although the device has aerobic, anoxic and anaerobic zones in the same reactor, the actual operation is relatively complicated, and it is difficult to ensure the appropriate conditions for each reaction zone. In addition, the gas The reflux of the lifting device cannot be freely controlled according to the water quality, and the practicability is poor

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