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Method for quickly achieving nitrite accumulation in municipal domestic sewage heterotrophic nitrification process

A technology of nitrite and heterotrophic nitrifying bacteria, which is applied in the field of rapid accumulation of nitrite in the process of heterotrophic nitrification of urban domestic sewage, achieving good application prospects, fast start-up speed and stable operation

Pending Publication Date: 2019-03-26
RENMIN UNIVERSITY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Heterotrophic nitrifying bacteria have great advantages in realizing the accumulation of nitrite in sewage treatment, but up to now, there have been no reports on the successful use of heterotrophic nitrifying bacteria in urban domestic sewage to realize the accumulation of nitrite

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The invention provides a method for quickly realizing nitrite accumulation in the process of heterotrophic nitrification of urban domestic sewage, comprising the following steps:

[0031] Using SBR reactor to domesticate heterotrophic nitrifying bacteria as the dominant strain:

[0032] Specifically include: SBR reactor inoculum mud is taken to the aeration tank of a sewage treatment plant in Beijing, and its concentration is concentrated to 10g L -1 , the anaerobic stage time in each operation cycle: the aerobic stage time: the sedimentation stage time = 3:8:1, the water inflow and drainage of urban domestic sewage are completed in the early anaerobic stage and the late stage of sedimentation respectively, and the sewage discharge ratio of each cycle is 0.5 ;The dissolved oxygen concentration in the aerobic stage is controlled at 2mg·L in each operation cycle -1 Above, in each operation cycle, the sludge age is controlled to be 3 days, the hydraulic retention time is ...

Embodiment 2

[0038] The invention provides a method for quickly realizing nitrite accumulation in the process of heterotrophic nitrification of urban domestic sewage, comprising the following steps:

[0039] Using SBR reactor to domesticate heterotrophic nitrifying bacteria as the dominant strain:

[0040] Specifically include: SBR reactor inoculum mud is taken to the aeration tank of a sewage treatment plant in Beijing, and its concentration is concentrated to 10g L -1 , the anaerobic stage time in each operation cycle: the aerobic stage time: the sedimentation stage time = 3:8:1, the water inflow and drainage of urban domestic sewage are completed in the early anaerobic stage and the late stage of sedimentation respectively, and the sewage discharge ratio of each cycle is 0.25 , the dissolved oxygen concentration in the aerobic stage is controlled at 2mg·L in each operation cycle -1 Above, the sludge age is controlled at 4 days, the hydraulic retention time is controlled at 12 hours, th...

Embodiment 3

[0046] The invention provides a method for quickly realizing nitrite accumulation in the process of heterotrophic nitrification of urban domestic sewage, comprising the following steps:

[0047] Using SBR reactor to domesticate heterotrophic nitrifying bacteria as the dominant strain:

[0048] Specifically include: SBR reactor inoculum mud is taken to the aeration tank of a sewage treatment plant in Beijing, and its concentration is concentrated to 10g L -1, anaerobic phase time in each operation cycle: aerobic phase time: sedimentation phase time = 3:8:1, the inflow and drainage of urban domestic sewage are completed in the early anaerobic and late sedimentation phases respectively, and the sewage discharge ratio of each cycle is 0.75 , the dissolved oxygen concentration in the aerobic stage is controlled at 2mg·L in each operation cycle -1 Above, the sludge age is controlled at 3 days, the hydraulic retention time is controlled at 12 hours, the reaction pH of the mixed solu...

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Abstract

The invention discloses a method for quickly achieving nitrite accumulation in a municipal domestic sewage heterotrophic nitrification process. According to the method, municipal domestic sewage is directly utilized to domesticate ordinary active sludge, an SBR reactor is utilized, sludge age and hydraulic retention time are respectively set as 3 to 4 d and 6 to 12 h, and operation is performed four periods everyday; furthermore, in each operation period, anaerobic stage time to aerobic stage time to sedimentation stage time is equal to 3 to 8 to 1; sewage feeding and sewage drainage are respectively finished at the initial anaerobic period and the last sedimentation period; the dissolved oxygen concentration in the aerobic stage is controlled as 2mg.L<-1> or more. In addition, the sewagedischarge ratio of the SBR reactor is set as 0.25 to 0.75, an operation temperature is controlled as 18 + / -2 DEG C, and a pH of reaction mixed liquid is controlled as 7 to 9. After domestication for 15 to 30 d, the maximum nitrite accumulation rate can reach 93.5%.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to a method for quickly realizing the accumulation of nitrite in the heterotrophic nitrification process of urban domestic sewage. Background technique [0002] The activated sludge method is the mainstream process of sewage treatment, accounting for more than 80% of the sewage treatment process, and has made outstanding contributions to the cause of environmental protection and health in the world. However, the activated sludge process for sewage treatment is a high-energy-consuming process, and the water and electricity consumption per ton is about 2.7 degree of electricity. Every year, my country's electricity consumption in the sewage treatment process accounts for 1%-2% of the total electricity consumption in the society, and with the continuous strictness of sewage discharge standards, the power consumption of sewage treatment is also increasing. hot topics. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30C02F3/12C02F3/34C02F101/16
CPCC02F3/1263C02F3/301C02F3/302C02F3/307C02F3/34C02F2101/16Y02W10/10
Inventor 邵宇婷张源凯王悦查亦飞王园园徐相龙王洪臣齐鲁刘国华
Owner RENMIN UNIVERSITY OF CHINA
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