| The ANAMMOX process is a low-energy,high-efficiency,and environmentally friendly denitrification process,which has received extensive attention for its significant advantages.In the current actual project,because of the long generation cycle of anaerobic ammonia oxidizing bacteria and the sensitivity to changes in the external environment,the ANAMMOX process is mostly used in the lateral flow process.How to apply the ANAMMOX process to the mainstream process is the current research direction,and one of the current ideas is the strengthening of microorganisms.Because a large amount of iron is present in anaerobic ammonia oxidizing bacteria,and bivalent iron ions can promote the activity of hydrazine dehydrogenase,so adding a certain amount of iron can enhance the activity of anaerobic ammonia oxidizing bacteria and help anaerobic ammonia Oxidizing bacteria resist adverse conditions such as low temperature.This subject mainly studies the short-term and long-term effects and operating conditions of the ZVI and Fe-C particles on the denitrification effect of ANAMMOX under low temperature conditions and provides a basis for the promotion of the ANAMMOX process.Taking the ANAMMOX reactor as the research object,ZVI and Fe-C particles were added respectively to observe the changes in the denitrification effect of the ANAMMOX reactor under the condition of gradually cooling down.The main contents include: rapid start-up and low-temperature domestication;the preparation of ZVI and Fe-C particles;Under various temperature gradient conditions,the short-term effect of ZVI and Fe-C particles on anaerobic ammonia oxidation reaction,the appropriate ZVI dosage and the Fe/C of Fe-C particles were screened out;When ZVI and Fe-C particles were added under the condition of gradually cooling during long-term operation,the nitrogen removal effect of the ANAMMOX reactor and the sludge properties changed.By inoculating the sludge in the secondary settling tank and the mature anaerobic ammonia oxidation granular sludge,the ANAMMOX reactor was successfully started in 90 days.When the temperature gradually decreases,the nitrogen removal effect of the ANAMMOX reactor is affected.When the temperature is around 15 degrees Celsius,the TN removal rate drops to 68.02%,the sludge concentration also decreases,and the EPS concentration increases slightly as the temperature decreases.After short-term administration of ZVI,it can promote the reaction rate of ANAMMOX.Among them,the best effect of anaerobic ammonia oxidation sludge is when the concentration of ZVI is 100 mg/L;The short-term addition of Fe-Cparticles also promotes the reaction rate of ANAMMOX.The addition of Fe-C particles with a Fe/C ratio of 2: 1 is the most stable.When the temperature drops to 20 ℃ in long-term operation,the ANAMMOX reaction is greatly affected by the temperature.At this time,ZVI(100mg/L)and Fe-C particles(Fe/C = 2: 1)are added to promote anaerobic ammonia oxidizing bacteria active.After being cultured at 15 ℃ for 50 days,the denitrification effect is better than that when it is not added.After adding ZVI,the dissolved oxygen in the reactor effluent decreased from 0.5 to 0.3,and the change was obvious;After the addition of Fe-C particles,the p H value of the reactor changed significantly due to the large dosage.The operating parameters need to be adjusted to control the p H value to be within the appropriate range of anaerobic ammonia oxidizing bacteria.The addition of ZVI and Fe-C particles can stimulate anaerobic ammonia-oxidizing bacteria to secrete EPS to better resist temperature changes.Because there are many factors to control the addition of Fe-C particles,under the conditions of long-term operation,the promotion effect of adding ZVI to the ANAMMOX reactor is better than that of adding Fe-C particles. |
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