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Method for implementing shortcut nitrification in complete nitrification biological denitrification system at normal temperature

A full-process nitrification and biological denitrification technology, applied to the field of short-range nitrification in the full-process nitrification biological denitrification system at room temperature, can solve problems such as weakening the adverse effects of low temperature during the start-up period, and achieve a strong guiding effect

Active Publication Date: 2009-05-06
BEIJING UNIV OF TECH
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  • Abstract
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Problems solved by technology

Although some researchers started short-cut nitrification at lower temperatures, the inoculated sludge was partially nitrosated sludge (NO 2 - -N / NO x - -N≈50%), weakening the adverse effect of low temperature during startup
At present, there are few reports on the successful initiation of short-cut nitrification in a system inoculated with full-process nitrification sludge in the treatment of urban sewage at room temperature.

Method used

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  • Method for implementing shortcut nitrification in complete nitrification biological denitrification system at normal temperature
  • Method for implementing shortcut nitrification in complete nitrification biological denitrification system at normal temperature

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specific Embodiment approach

[0028] The specific embodiment of the present invention is: (see attached figure 1 )

[0029] Phase I adopts the aeration mode of constant air supply and oxygen-limited aeration to keep the dissolved oxygen in the system at a low level, and the average DO level is 0.5-0.8mg / L. The sludge age is controlled at 50-60 days through regular sludge discharge at the end of each cycle of aerobic phase. The aeration time is regularly controlled in a short cycle, and the aeration time of each cycle is 3 hours. The water quality changes of the influent and effluent are measured by the routine water quality monitoring method in the laboratory. After the effluent NO 2 - -N / NO x - -N rises to 30-60% and enters stage II. At the same time, mud samples are collected periodically for FISH testing to determine the proportion of AOB and NOB in the total flora, providing molecular biological evidence for the dynamic changes of the system flora structure;

[0030] Phase II adopts the aeration m...

Embodiment 1

[0034] A 11L SBR reactor was used for the test, and the sewage used was taken from the actual domestic sewage in the residential area, which is a typical low C / N wastewater. Its water quality index is: COD=121~416mg / L, NH 4 + -N=54~78mg / L, NO 3 - -N=0~0.21mg / L, NO 2 - -N=0~0.09mg / L, pH=7.46~8.01, total alkalinity=455.6~556mg / L (CaCO 3 Count), C / N is 1.89~2.51. The inoculum sludge was taken from the return sludge of the secondary settling tank of a sewage treatment plant in Beijing, which is a full-process nitrification sludge. FISH test showed that the proportion of AOB to the total bacterial flora was 1.98%, and NOB was 8%. The water temperature in the reactor is controlled at (19°C ± 1°C) by the temperature control device, and the sludge age is controlled to 50 days by regular sludge discharge at the end of the aerobic stage of each cycle.

[0035] (1) Stage I: The average level of DO is controlled by oxygen-limited aeration to 0.46mg / L, and the aeration time per cycl...

Embodiment 2

[0040] A 6.5L SBR reactor was used for the test, and the test water was domestic sewage from the family area of ​​Beijing University of Technology. Its water quality index is: COD=101~236mg / L, NH 4 + -N=34~68mg / L, NO 3 - -N=0~0.17mg / L, NO 2 - -N=0~0.04mg / L, pH=7.24~8.31, total alkalinity=405.6~581mg / L (CaCO 3 Count), C / N is 1.54 ~ 2.89. The inoculum sludge was taken from the secondary settling tank sludge of a pilot denitrification reactor. The denitrification performance was good, and it belonged to the whole process of nitrification sludge. FISH test showed that the proportion of AOB to the total bacterial flora was 4.98%, and NOB was 9.4%. Without temperature control, the water temperature ranges from 8.2°C to 16.7°C, and the sludge age is controlled to 65 days through sludge discharge.

[0041] (1) Stage I: The average level of DO is controlled by oxygen-limited aeration to 0.34mg / L, and the aeration time per cycle is 3h. Run for 22 days NO 2 - -N / NO x - -N inc...

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Abstract

The method for realizing short distance nitration at the normal temperature by using an entire journey nitration biological denitrification system belongs to the field of the wastewater enhancing biological denitrification treating technique. At present, the realization of nearly all short distance nitration is carried out in the medium-high temperature state; the short distance nitration is difficult to start in the medium-low temperature and the starting period is long, which greatly limits the actual application of the nitration denitrifacation. In the method, the sludge age is controlled to be 50-60 days; the whole process is divided into four stages; each stage uses an aeration mode with constant air supply; the DO level is controlled to be 0.5-0.8 mg / L; the initial stage of the experiment uses timing control aeration time; and finally, the aeration is finished at an ammonia valley point of a pH curve. The invention provides a method for regulating and controlling the competitive advantage of nitration flora AOB and NOB in a sewage treating system at the normal temperature. In addition, the invention is started by the common entire journey nitration sludge which maintains the short distance nitration, thus being more in line with the practical running of the sludge treating factory and has very strong directive significance in the short distance denitrification application of the practical project.

Description

technical field [0001] The invention relates to a method for realizing short-range nitrification in a whole-process nitrification biological denitrification system at normal temperature, which is used for treating urban sewage at normal temperature and starting and maintaining short-range nitrification in an ordinary full-process nitrification biological denitrification system. Background technique [0002] In recent years, in order to control the eutrophication of water bodies, the sewage nitrogen and phosphorus discharge standards have become increasingly stringent. The new national sewage discharge standard stipulates that the first-level discharge standard (A standard) of ammonia nitrogen concentration shall not exceed 5mg / L, which puts forward higher requirements for effluent ammonia nitrogen. Therefore, the research and development of economical, efficient and energy-saving biological denitrification technology is currently a research hotspot in line with my country's ...

Claims

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Application Information

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IPC IPC(8): C02F3/12
CPCY02W10/10
Inventor 曾薇张悦彭永臻李磊
Owner BEIJING UNIV OF TECH
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