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Method for culturing granular sludge by shortcut denitrification

A technology of nitrifying particles and culturing method, applied in the field of biological wastewater treatment, can solve the problem of low total nitrogen removal rate, and achieve the effects of good impact resistance, good treatment effect and high removal load

Active Publication Date: 2010-12-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem that the total nitrogen removal rate is not high due to the low sludge concentration in the existing short-range denitrification process, the purpose of the present invention is to provide a method for cultivating denitrification granular sludge, which is used in industries with high ammonia-nitrogen and low carbon-to-nitrogen ratio. Wastewater biochemical treatment process, specifically related to a method of cultivating denitrification granular sludge with nitrite nitrogen as a substrate, in order to truly apply the short-range nitrification and denitrification process to practical projects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1 The cultivation of short-range denitrification granular sludge

[0029] (1) Enrichment culture of denitrification granular sludge

[0030] Take a certain amount of activated sludge from the aerobic aeration tank of a refinery sewage treatment plant, put it into a 10L aerobic reactor according to the inoculation amount of 10% (volume), and use ammonia-containing wastewater to enrich the denitrification granular sludge to cultivate. The initial ammonia nitrogen concentration of the culture medium is 200mg / L, and the method of batch water feeding is adopted. The concentration of ammonia nitrogen is increased for each batch of water samples by 100mg / L, and the COD concentration is always 150mg / L. The enrichment culture conditions of the denitrification sludge are: temperature 25°C; pH 7.8; DO (dissolved oxygen) 2-5mg L -1 . When the enriched sludge can tolerate 1000mg / L ammonia nitrogen, take part of the sludge and transfer it to the denitrification granular...

Embodiment 2

[0035] Embodiment 2 The cultivation of short-range denitrification granular sludge

[0036] Take a certain amount of activated sludge from the aerobic aeration tank of a catalyst sewage treatment plant, put it into a 10L reactor with a stirring and aeration system at the same time according to the inoculum amount of 10%, and first denitrify the particles with ammonia-containing wastewater Sludge enrichment culture. The initial ammonia nitrogen concentration of the culture medium was 300mg / L, and the method of batch water inflow was adopted. During the cultivation process, the ammonia nitrogen concentration was gradually increased by 150mg / L, and the COD concentration was always 200mg / L. The enrichment culture conditions of the denitrification sludge are: temperature: 35°C; pH: 8.0; DO: 2-5 mg·L -1 . When the enriched sludge can tolerate 800mg / L ammonia nitrogen, replace the culture medium and enter the denitrification granular sludge enrichment culture stage. At this stage,...

Embodiment 3

[0037] Example 3 Application of denitrification granular sludge in nitrogen fertilizer wastewater denitrification process

[0038] The short-range denitrification granular sludge obtained in Example 1 is used to process the short-range nitrification effluent of ammonia-containing wastewater produced in the nitrogen fertilizer production process. In this water: COD is 300mg / L on average, NH 3 -N is 35mg / L, NO 2 - -N is 400mg / L, NO 3 - -N is 15 mg / L. Denitrification treatment conditions are: temperature 28°C; pH 7.7; DO (dissolved oxygen) 0.4mg L -1 . After treatment, the effluent COD, NH 3 -N, NO 2 - -N, NO 3 - -N is 10-20mg / L, 11mg / L, 2mg / L, 8mg / L respectively.

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Abstract

The invention discloses a method for culturing granular sludge by shortcut denitrification. The method comprises the following steps of putting inoculated sludge into an aerobic reactor, and performing enrichment culture on denitrifying sludge by using high ammonia-nitrogen low COD wastewater; then, performing secondary enrichment screening by wastewater simultaneously containing nitrate nitrogen, nitrite and COD in a facultative anaeration reactor, and performing third enrichment screening by wastewater only containing nitrite and COD; and finally acclimating by wastewater simultaneously containing ammonia-nitrogen, nitrite and COD to obtain the denitrified granular sludge with high removal rate on the nitrite when various forms of nitrogen coexist commonly. By the method, the denitrified granular sludge which can survive in a complicated environment and is capable of effectively treating wastewater nitrous nitrogen under proper condition can be obtained, and the shortcut nitrification-denitrification process can be truly applied to actual engineering conveniently.

Description

technical field [0001] The invention belongs to the technical field of wastewater biological treatment, in particular to a method for cultivating denitrification granular sludge utilizing nitrite nitrogen. Background technique [0002] At present, the biological denitrification of wastewater mainly adopts the activated sludge method. Nitrifying bacteria and denitrifying bacteria in activated sludge work together to convert various forms of nitrogen in sewage into gaseous nitrogen. From the perspective of nitrification process, ammonia nitrogen (NH 3 -N) is oxidized to nitrite nitrogen (NO 2 -N) and nitrate nitrogen (NO 3 -N) are two different reactions performed by two separate types of bacteria, which should be separable. From the perspective of denitrification process, NO 2 -N and NO 3 -N can be used as the final electron acceptor. Therefore, the whole biological denitrification process can be carried out by NH 3 -N converted to NO 2 -N is converted to N again 2 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28
Inventor 高会杰黎元生许谦佟明友李志瑞唐似茵
Owner CHINA PETROLEUM & CHEM CORP
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