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Rapid start-up method for high-efficiency autotrophic denitrification system for treating high-ammonia nitrogen wastewater

An autotrophic denitrification and quick-start technology, applied in sustainable biological treatment, water treatment parameter control, chemical instruments and methods, etc., can solve the problem of filler sedimentation, obstruction of fluidization, large-scale expansion of projects with high inoculation difficulty, etc. question

Active Publication Date: 2020-02-07
QINGDAO SPRING WATER TREATMENT
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AI Technical Summary

Problems solved by technology

Although the inoculation rate of this technology is low and the start-up 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 in 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 air-lift device, the experimental mixture is refluxed, and the short-range denitrification used to control the step of converting nitrate nitrogen into nitrous nitrogen in the reflux has high requirements for water quality, and the influent COD is too much or the HRT is too long. As a result, the whole process of denitrification destroys the balance of the reactor. Although the device is equipped with aerobic, anoxic and anaerobic zones in the same reactor, the actual operation is more complicated, and it is difficult to ensure the appropriate conditions in each reaction zone. In addition, the airlift device is used The reflux cannot be freely controlled according to the water quality, and the practicability is poor

Method used

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  • Rapid start-up method for high-efficiency autotrophic denitrification system for treating high-ammonia nitrogen wastewater
  • Rapid start-up method for high-efficiency autotrophic denitrification system for treating high-ammonia nitrogen wastewater

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Experimental program
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Effect test

Embodiment 1

[0121] The high-concentration ammonia-nitrogen wastewater produced in the production process of a bioengineering company is used as the system feed water, with a water volume of 3000m 3 / d, pH average 7.9, water temperature average 32°C, influent COD concentration average 2500mg / L, BOD 5 The average concentration is 1500mg / L, the average ammonia nitrogen concentration is 800mg / L, the average nitrous nitrate concentration is 2.0mg / L, and the average alkalinity (calculated as CaCO 3 total) 5000mg / L, the total effective volume of the reaction pool is 800m 3 , the effective volume of the denitrification tank is 800m 3 , the influent enters the four reaction pools C1-C4 through the denitrification pool.

[0122] In preparation for start-up, a suspension carrier is added to each reaction tank and denitrification tank, and the effective specific surface area of ​​the carrier is 800m 2 / m 3 , with a porosity of 90%, in line with the industry standard of "High Density Polyethylene ...

Embodiment 2

[0131] The sludge digestion solution used in the test is the dewatered filtrate after sludge digestion in a sewage treatment plant. The sewage treatment plant adopts the medium temperature anaerobic digestion process to treat the sludge, and the solid content of the sludge is 10%. Water volume 2000m 3 / d, pH value 7.8-7.9, average water temperature 30°C, average influent COD concentration 810mg / L, BOD 5 The average concentration is 620mg / L, the average ammonia nitrogen concentration is 560mg / L, and the total effective volume of the reaction pool is 400m 3 , divided into four reaction pools on average, and the effective volume of each reaction pool is 100m 3 , effective volume of denitrification pool 100m 3 , Influent water enters four reaction pools C1-C4 after passing through the denitrification pool.

[0132] In preparation for start-up, a suspension carrier is added to each reaction tank and denitrification tank, and the effective specific surface area of ​​the carrier i...

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Abstract

The invention discloses a rapid starting method of an efficient autotrophic nitrogen removal system used for treating high-ammonia nitrogen wastewater, and belongs to the technical field of wastewaterbiological 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 nitrogenremoval, 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 can be 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 through a 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 technology is realized; according to treatment requirements, different technological arrangement modes are realized. The rapid starting method has the advantages that occupied land is small, the inoculationproportion 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 wastewater biological denitrification, and in particular relates to a quick-start method for an efficient autotrophic denitrification system for treating high-ammonia-nitrogen wastewater. 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 denitrificat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/12C02F3/30C02F101/16
CPCC02F3/121C02F3/1268C02F3/302C02F3/307C02F2101/16C02F2209/22Y02W10/10
Inventor 周家中吴迪韩文杰管勇杰
Owner QINGDAO SPRING WATER TREATMENT
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