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Rapid short-cut nitrification treatment of urban sewage based on FNA pretreatment of biofilm

A technology for short-range nitrification and urban sewage, which is applied in chemical instruments and methods, sustainable biological treatment, biological water/sewage treatment, etc. Low problems, to achieve the effect of quick start, simple operation and high efficiency

Active Publication Date: 2022-04-12
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the methods to achieve short-range nitrification are to control parameters such as pH and dissolved oxygen (DO), but the reaction rate is low, the start-up time is long, and the short-range nitrification is unstable, which affects the promotion and application of urban sewage to achieve autotrophic denitrification.

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  • Rapid short-cut nitrification treatment of urban sewage based on FNA pretreatment of biofilm

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Short-cut nitrification of urban sewage by using FNA pretreatment biofilm:

[0022] In a stable SBBR reactor, 6.5mg / L is selected as the FNA concentration value of the pretreated biofilm according to the determined optimal concentration range of FNA, and the biofilm is soaked for 12 hours for pretreatment on the 11th day. After pretreatment, the routine operation, NAR Immediately reach more than 80% and remain stable, water NH 4 + -N=8±3mg / L, NO 3 - -N=10±2mg / L, NO 2 - -N=30±4mg / L, COD=42±7mg / L, which proves that stable short-range nitrification has been achieved;

[0023] refer to figure 1 For the short-range nitration NH that realizes fast according to the method for embodiment 1 4 + -N, NO 2 - -N, NO 3 - -N concentration and NAR changes with time, it can be seen that after the FNA pretreatment of the biofilm in the SBBR with stable operation on the 11th day, the effluent NO 3 - -N concentration decreased rapidly, effluent NO 2 - -N concentration rises...

Embodiment 2

[0025] Short-cut nitrification of urban sewage by using FNA pretreatment biofilm:

[0026] For SBBR with stable operation, select FNA=6.0mg / L, soak the biofilm for 12 hours for pretreatment, and perform regular operation after pretreatment, the calculated NAR reaches about 80% and remains stable, and the effluent NH 4 + -N=6±3mg / L, NO 3 - -N=8±3mg / L, NO 2 - -N=31±4mg / L, COD=53±8mg / L, which proves that stable short-range nitrification has been achieved.

Embodiment 3

[0028] Short-cut nitrification of urban sewage by using FNA pretreatment biofilm:

[0029] For SBBR with stable operation, select FNA=7.0mg / L, soak the biofilm for 12 hours for pretreatment, and perform regular operation after pretreatment, the calculated NAR reaches more than 80% and remains stable, and the effluent NH 4 + -N=8±3mg / L, NO 3 - -N=7±3mg / L, NO 2 --N=36±2mg / L, COD=50±3mg / L, which proves that stable short-range nitrification has been achieved.

[0030] According to the method of embodiment 2 and embodiment 3, NH in the final effluent 4 + -N, NO 2 - -N, NO 3 - -The concentration of N and the change of NAR and the final effluent NH in accordance with the method of Example 1 4 + -N, NO 2 - -N, NO 3 - -N concentration and NAR have the same changing trend.

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Abstract

The invention discloses a method for quickly realizing short-range nitrification treatment of urban sewage based on FNA pretreatment of biofilm. The biofilm in SBBR is stabilized through FNA pretreatment operation, and stable short-range nitrification is quickly realized. The method utilizes the tolerance of AOB and NOB to FNA The short-cut nitrification can be started immediately after pretreatment of the biofilm for 12 hours. The method is suitable for treating low-ammonia-nitrogen wastewater such as urban sewage, and is simple and easy to operate, can greatly save short-range nitrification start-up time, and has good treatment effect.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment methods, and in particular relates to a method for quickly realizing short-range nitrification treatment of urban sewage based on FNA pretreatment biofilm. Background technique [0002] With the continuous occurrence of eutrophication, biological denitrification technology has been widely studied and applied. Due to the low carbon-to-nitrogen ratio (C / N) of urban sewage in my country, traditional biological denitrification consumes a lot of energy, lacks carbon sources, and has low efficiency. Compared with the traditional whole-process nitrification process, the short-cut nitrification process can reduce 25% of the oxygen demand for nitrification, 40% of the denitrification carbon source, 50% of the sludge production and the volume of the denitrification tank, so it has become a current research hotspot. [0003] The essence of short-cut nitrification is to enrich ammonia oxidizing bact...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/10C02F3/34C02F101/16
CPCC02F3/10C02F3/34C02F2101/16Y02W10/10
Inventor 李军丁凡梁东博吴耀东李东岳侯连刚张凯孙志涛
Owner BEIJING UNIV OF TECH