For the anaerobic ammonium oxidation process, usually see much, and today I saw this process more energy-efficient, and now the cost of sewage treatment is quite high, so I want to share with you. Do water treatment all know that the biological treatment of biological nitrogen removal and denitrification process actually achieved.
In the aerobic tank, nitrite and nitrite are used to oxidize ammonia nitrogen into nitrite and nitrate nitrogen. In the anoxic tank, due to the function of facultative denitrifying bacteria (denitrifying bacteria), NO2 - N and NO3 - N reduced to N2 into the air.
For everyone to be intuitive:
NH4 + 1.83O2 + 1.98HCO3 → 0.021C5H7O2N + 0.98NO3 + 1.04H2O + 1.884H2CO3
It can be seen, 1g nitrogen completely nitrified, aerobic 4.57g, which means that to complete the nitration reaction requires a lot of energy consumption, directly to spend a lot of money. In the meantime, a lot of excess sludge will be generated during the sewage treatment. At this moment, we will cost the sludge again.
But what we do not know (maybe you know) is nitrous Oxide (N2O) in the process. Presumably everyone is even more unaware that this is a more powerful greenhouse gas than carbon dioxide. Its single molecule warming The potential is actually 310 times the carbon dioxide!
This time it is necessary to introduce the anaerobic ammonia oxidation process principle: that under anaerobic conditions, the NH4 + or NO2- into N2.
Because anaerobic ammonium oxidation process is autotrophic, there is no need for additional COD to support denitrification, which can save 60% carbon source compared with conventional denitrification process. Moreover, combining anaerobic ammonium oxidation with a pre-nitrification process requires only partial oxidation of NH4 + to NO2-N, which can provide a 62.5% reduction in oxygen supply over full nitrification 50% of the consumption of alkali.
The United States Geological Survey USGS organized a research team to conduct a survey at Cape Cod, Mass., Where they conducted a research project on the underground nitrogen cycle. Researchers found that there is an active anaerobic ammonium oxidation reaction there. Although its rate is relatively low, the discovery is still of concern given the low concentration of ammonia nitrogen in groundwater. "We have initially demonstrated the anaerobic ammoxidation activity in groundwater," said Rid Smith, a hydrogeologist at the United States Geological Survey. He is also one of the four authors of this research report. He stressed: "This finding is very important, because denitrification has so far been considered as the only way to finally remove nitrogen in groundwater."
Prior to this, the related research on anaerobic ammonium oxidation in the sewage treatment community has been for decades, and this latest study has found that it will provide a new prospect for anaerobic ammonium oxidation.
Mr. Smith said: "Water sector managers may be interested in these results, and for now we know that this can happen underground, but it can also be applied to the design of septic tanks, leachate storage tanks and water reuse projects within consideration."
Nitrate is one of the important pollutants that cause groundwater pollution. Once it is discharged into the surface water environment, nitrate can lead to eutrophication such as bloom. Mr. Smith said that based on the results of this project, anaerobic ammonium oxidation may be the way out.
He said: "We are studying the ultimate whereabouts of nitrogen at the interface between groundwater and surface water, especially those containing ammonia and nitrate that enter the lake through groundwater and we are studying the removal of this element by anaerobic ammonium oxidation The amount of nitrogen fixation, and how much more eventually flows to the lake, causing eutrophication. "
They also conduct other studies to verify what role anaerobic oxidation can play in future water management, such as whether it can be the antidote to algae blooms.
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