SBR (Sequencing batch reactor) nitrosation quick start method

A rapid start-up, nitrosation technology, applied in the field of urban sewage treatment and resource utilization, to achieve the effect of high start-up efficiency

Inactive Publication Date: 2013-05-22
BEIJING UNIV OF TECH
10 Cites 3 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0005] However, the growth characteristics of the two strains and the suitable conditions for survival are similar. How to quickly separate AOB from the mixed syste...
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Abstract

The invention discloses an SBR (sequencing batch reactor) nitrosation quick start method, and belongs to the field of urban sewage treatment and resource recycling. Aiming at the problems that AOB (Ammonia Oxidizing Bacteria) and NOB (Nitrite Oxidizing Bacteria) are similar in growth characteristics and AOB are difficult to separate and screen, returned nitration sludge in a sewage treatment plant is inoculated in an SBR reactor, the inflow ammonia nitrogen concentration is controlled at 300-500mg/L, the aeration quantity is controlled so that the concentration of dissolved oxygen is 0.2-0.5mg/L, the aeration time is controlled so that the ammoxidation rate is controlled at 30-50%, sodium hydrogen carbonate is added to regulate and control pH at 7.70-8.20, and the outflow nitrosation rate that is the ratio of nitrite accumulated by reaction and the sum of accumulated nitrite and nitrate is calculated by maintaining the conditions. The nitrosation rate reaches more than 90% after 4 days and 8 cycles, and the nitrosation rate is always more than 90% after 7 days and 14 cycles, so that the nitrosation is successively started.

Application Domain

Technology Topic

ChemistryAmmonia-oxidizing bacteria +12

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  • SBR (Sequencing batch reactor) nitrosation quick start method
  • SBR (Sequencing batch reactor) nitrosation quick start method
  • SBR (Sequencing batch reactor) nitrosation quick start method

Examples

  • Experimental program(1)

Example Embodiment

[0022] The test is based on simulated sewage, and the specific water quality is as follows:
[0023] Influent water quality during startup: NH 4 + -N=300-500mg/L, pH=7.70~8.20, temperature 25±1℃.
[0024] Influent water quality during steady operation of medium ammonia nitrogen: NH 4 + -N=150±15mg/L, pH=7.70~8.20, temperature 25±1℃.
[0025] Influent water quality during stable operation with low ammonia nitrogen: NH 4 + -N=50±5mg/L, pH=7.70~8.20, temperature 25±1℃.
[0026] The specific processing is as follows:
[0027] Operation effect of nitrosated sludge during the startup stage figure 1
[0028] Inoculate the backflow nitrification sludge from the sewage treatment plant into the SBR reactor, control the influent ammonia nitrogen concentration to 300-500mg/L, control the aeration volume to make the dissolved oxygen 0.2-0.5mg/L, control the aeration time to make the ammonia oxidation rate Control at 30%-50%, add sodium bicarbonate to adjust the pH to maintain it at 7.70-8.20. The use of high free ammonia in the water to inhibit NOB, the inhibition of NOB activity by low dissolved oxygen 0.2-0.5mg/L, and the small inhibition of AOB. In addition, it is guaranteed by controlling the ammonia oxidation rate to maintain 30%-50%. Free ammonia always suppresses NOB during each cycle. Under the synergistic inhibition of various conditions, NOB was quickly washed out of the SBR system. by figure 1 It can be seen that the initial nitrification rate of sludge is 18%, and after 4 cycles the nitrification rate has increased significantly to 67%, which reflects that the nitrosation rate has reached 90% in 4 cycles. figure 1 It can be seen that the nitrosation rate has been maintained at more than 90% after running for 7 days and 14 cycles under this condition, marking the successful rapid start of nitrosation.
[0029] The operation effect of nitrosated sludge in the stable operation stage of medium ammonia nitrogen see figure 2
[0030] In the 23rd cycle, change the influent ammonia nitrogen concentration to 150±15mg/L, control the aeration volume so that the dissolved oxygen is 0.5-1.0mg/L, and control the aeration time so that the ammonia oxidation rate is 90%-99%. After 30 days and 60 cycles, the nitrification rate has been maintained at more than 90%, indicating that the nitrosated sludge has good stability under the ammonia nitrogen concentration in the influent water after startup.
[0031] Operation effect of nitrosated sludge during stable operation with low ammonia nitrogen see image 3
[0032] In the 83rd cycle, change the influent ammonia nitrogen concentration to 50±5mg/L, control the aeration volume so that the dissolved oxygen is 0.5-1.0mg/L, control the aeration time so that the ammonia oxidation rate is 85%-95%, After 30 days and 60 cycles, the nitrification rate has been maintained above 90%, indicating that the nitrosated sludge has good stability under low influent ammonia nitrogen concentration after startup.
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