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Method for quickly starting shortcut nitrification reactor

A nitrification reactor and short-path nitrification technology are applied in the field of quick-start short-path nitrification reactors, and can solve problems such as unfavorable short-path nitrification reactors to quickly start nitrite and the like

Active Publication Date: 2015-04-29
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the nitrification system, it takes a long time to achieve the trade-off between NOB and AOB through a single factor control, which is not conducive to the rapid start-up of the short-range nitrification reactor (that is, the accumulation of nitrite)

Method used

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  • Method for quickly starting shortcut nitrification reactor

Examples

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Effect test

Embodiment 1

[0027] A 10L upflow air-lift nitrification reactor was used to inoculate 2L of nitrification sludge (sludge concentration 1.1gVSS / L) from a pilot nitrification reactor. The salt concentration is 1.0g / L, the HRT is 11.9h, and the average influent pH is 8.25. First, the reactor is aerated and impacted, and the gas flow rate is kept at 160L / h. The average dissolved oxygen concentration in the reactor is measured to be 2.0mg / h L, keeping for 14 days, the removal rate of ammonia nitrogen is close to 100%, almost all of ammonia nitrogen is converted into nitrate, and the accumulation rate of nitrite is basically 0, indicating that the whole process of nitrification has been realized in the reactor. Then reduce the gas flow rate to 10-30L / h, and reduce the HRT to 7.9h at the same time, keep it for 9 days, the measured dissolved oxygen concentration is 0.3-0.8mg / L, the removal rate of ammonia nitrogen is reduced to 31.2%, and the accumulation rate of nitrite less than 15%. Afterwards...

Embodiment 2

[0029] A 10L upflow air-lift nitrification reactor was used to inoculate denitrification sludge from a sewage treatment plant. After the inoculation, the measured sludge concentration was 2.3gVSS / L, and the initial average influent ammonia nitrogen concentration was controlled at 185mg / L. The salt concentration is 1.0g / L, the HRT is 21.5h, and the average influent pH is 8.4. First, the reactor is aerated and impacted, and the gas flow rate is kept at 200L / h. The average dissolved oxygen concentration in the reactor is measured to be 2.8mg / h L, kept for 16 days, the removal rate of ammonia nitrogen was close to 100%, and the accumulation rate of nitrite was 0. Subsequently, the concentration of ammonia nitrogen in the influent was increased to 300 mg / L, the gas flow rate was reduced to 5-20 L / h, and the measured dissolved oxygen concentration was 0.2-0.8 mg / L. After maintaining for 9 days, the removal rate of ammonia nitrogen was reduced to 47.3%. The rate of salt accumulation ...

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Abstract

The invention discloses a method for quickly starting a shortcut nitrification reactor. The method comprises the following steps: after performing inoculation on the reactor, firstly performing overaeration, and applying an aeration impact so as to accelerate the elimination of anaerobic bacteria in sludge; quickly enriching nitrifying bacteria, and then applying a combined load impact comprising a substrate concentration impact and a hydraulic retention time impact so as to quickly restrain and eliminate nitrite oxidizing bacteria; finally, under the condition that an appropriate substrate concentration and an appropriate hydraulic retention time are maintained, increasing the concentration of an inorganic carbon source so as to enrich ammonia oxidizing bacteria and accelerate the accumulation of nitrite. According to the invention, the various continuous impacts are combined, the enrichment of the ammonia oxidizing bacteria in the sludge is accelerated within a shorter time, and the quick start of the shortcut nitrification reactor is realized.

Description

technical field [0001] The invention relates to the technical field of wastewater biological denitrification, in particular to a method for quickly starting a short-range nitrification reactor. Background technique [0002] During the "Eleventh Five-Year Plan" period, chemical oxygen demand (chemical oxygen demand, COD) emissions were effectively controlled, and ammonia nitrogen rose as the main pollutant in surface water. Excessive ammonia nitrogen in surface water was common throughout the country, resulting in eutrophication of water bodies. serious. my country has incorporated ammonia nitrogen into the "Twelfth Five-Year Plan" total pollutant control system. Water nitrogen pollution control has become a major environmental protection issue to be solved urgently. [0003] Short-cut nitrification is a biological denitrification process that controls ammonia oxidation at the nitrite stage through nitrifying bacteria. Since there is no need to further oxidize nitrite to ni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/02
CPCC02F3/02C02F3/34C02F2101/16C02F2103/001C02F2209/08Y02W10/10
Inventor 唐崇俭柴立元闵小波杨志辉王海鹰彭兵
Owner CENT SOUTH UNIV
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