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Domestic sewage biological denitrogenation method and device thereof

A technology for biological denitrification and domestic sewage, applied in the field of biological denitrification of domestic sewage, can solve the problems of low denitrification efficiency, poor stability, complex biological denitrification process, etc., achieve the perfection of metabolic process, reduce the impact of organic load, and improve the reaction efficiency effect

Inactive Publication Date: 2009-12-23
NANJING UNIV OF TECH
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  • Summary
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  • Claims
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Benefits of technology

This patented technology describes various technical features related to reactors used in wastewater purifications systems: (a) Compact structures are designed to allow liquid from one part of the system to mix well before reaching another;(b) Dilute waters promote effective contact between suspended particles while reducing their concentration levels downstream. These improvements enhance the overall performance of these processes.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the efficient removal of nitroamine from industrial wastes containing excessive amounts of urea nitronitrogen content without increasing operational expenses or requiring more complex equipment for effective treatments like conventional methods.

Method used

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  • Domestic sewage biological denitrogenation method and device thereof

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Embodiment 1

[0023]Embodiment 1: The mixing zone (I), the main reaction zone (II) and the buffer zone (III) are set for the biological denitrification device of domestic sewage, and the volume ratio of each zone is 1: (2~4): (0.5~1) . The mixing zone (I) is separated from the main reaction zone (II) by a baffle 12, there is no special structure in the mixing zone, and a deflector 13 is installed behind the baffle 12. The inside of the main reaction zone (II) is provided with a perforated plate 14 according to the volume ratio of the front and rear areas, and the diameter of the perforation is less than 8-10 cm, which is used to fix the carrier ball 5 in the front area, and the combined packing 6 is installed in the rear area. Trachea or aeration disc7. The main reaction zone (II) is separated from the buffer zone (III) by a baffle plate 11. A baffle plate 9 and an inclined plate 10 are arranged in the buffer zone (III). 1 / 3~1 / 2 depth of the device, 5~25cm away from the side. The incline...

Embodiment 2

[0025] Example 2: The volume ratio of the front and rear regions of the main reaction zone II of the device is 1:2, the dissolved oxygen in the front and rear regions is 0.2mg / L and 1.5mg / L respectively, the concentration of ammonia nitrogen in the influent is 50mg / L, the COD is 250mg / L, and the concentration of TN 72mg / L, reflux ratio 0.5:1, final effluent ammonia nitrogen concentration 1.4mg / L, COD 24mg / L, TN concentration 8mg / L, SS8mg / L. The removal rates of ammonia nitrogen, COD and TN were 97.2%, 90.4% and 88.9% respectively.

Embodiment 3

[0026] Example 3: The volume ratio of the front and rear regions of the main reaction zone II of the device is 1:1, the dissolved oxygen in the front and rear regions is 0.3mg / L and 1.9mg / L respectively, the concentration of ammonia nitrogen in the influent is 52mg / L, the COD is 265mg / L, and the concentration of TN 79mg / L, reflux ratio 1:1, final effluent ammonia nitrogen concentration 1.8mg / L, COD 27mg / L, TN concentration 8.2mg / L, SS10mg / L. The removal rates of ammonia nitrogen, COD, and TN were 96.5%, 89.8%, and 89.6%, respectively.

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Abstract

The invention relates to a domestic sewage biological denitrogenation method and a device thereof. The device consists of a mixing area, a main reaction area and a buffer area. Sewage and backwash water are mixed sufficiently in the mixing area according to certain portion, and then fed into the main reaction area, and finally denitrogenated synchronously under a facultative aerobic environment to remove COD; part of free sludge is settled in the buffer area; and then the sewage is drained. In the drained water, COD content is less than or equal to 30mg/L, ammonia nitrogen content is less than or equal to 2mg/L, total nitrogen content is less than or equal to 10mg/L, and SS content is less than or equal to 10mg/L. The denitrogenation method separates the nitrobacteria residence time from the water residence time and uses COD of sewage and part bacterium as the denitrification carbon source.

Description

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Claims

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Application Information

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Owner NANJING UNIV OF TECH
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