Once upon a time, there was a little green frog. It lived near a pond. Every day, it would hop around the lily pads, looking for insects to eat. One day, it saw a big, shiny beetle. The frog tried to catch it but the beetle flew away quickly. So, the little green frog just sat on a lily pad and croaked happily.
Perhaps the moral of the story is about friendship and cooperation. If in the story the frog made friends with other pond animals, it shows that by getting along with others, we can have more fun and support. Just like the frog and its friends could share resources and protect each other from danger in the pond environment.
I'm not certain, but I assume the little green frog is the main character. There might also be other animals like birds, fish or other frogs that could be its friends or foes.
The little green frog story could center around the frog's daily life. It might be that the frog wakes up every morning on a lily pad, looking for food. It could be a story about how the frog's green color helps it blend in with the surrounding plants, which is a great advantage for both hunting and hiding from danger. There could be parts where the frog interacts with different elements of its environment, like the water, the mud, and the plants. And perhaps there's a part where the frog discovers a new area of the pond that has more food or is a better place to hide, and it has to decide whether to share this discovery with the other animals or keep it to itself.
From the little green frog story, we might learn about the importance of being observant. The little green frog has to be aware of its surroundings to find food and avoid danger. Also, it can teach us about the cycle of life as the frog goes through different stages of growth. Another thing could be the value of having a home, like the frog's pond, which provides it with everything it needs to survive.
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The main reasons for the high TN in the effluents were as follows: low nitrogen removal efficiency in the anoxic-tank, problems of internal recycling, low PL, destruction of the anoxic-environment in the dinitration tank, sludge load and sludge age, ratio of internal and external recycling, dinitration rate, insufficient dissolved oxygen, insufficient carbon source, etc.
The reason for the high TN of the discharged water may be caused by many factors. The following possible reasons could be summarized:
1. Low nitrogen removal efficiency of the anoxic-tank: In the practical application cases of urban sewage treatment plants, it was found that the reason for the excessive TN in the outlet water was that the nitrogen removal efficiency of the anoxic-tank was low, resulting in high nitrogen in the outlet water. The solution was to shut down the aerating system of the aerating grit chamber and add some control measures such as adding Na-acetate into the anaerobic tank to improve the stable discharge of TN in the outlet water.
2. [Lacking carbon source: In the process of nitrogen and nitrogen removal, the theoretical ratio of TN: TN required for TN removal is 2.86, but in actual operation, the ratio of TN is generally controlled at 4~6.] The lack of carbon source was one of the main reasons why the TN of the sewage treatment plant did not meet the standard. The solution was to add a carbon source according to the ratio of CH to N of 4 to 6.
3. Internal Reflux Problem: The excessive amount of nitrogen and nitrogen caused by internal return can also be attributed to the impact of organic matter. Because there is no return of nitration liquid, there is only a small amount of nitrate-nitrogen carried by external return in Pool A. Overall, it is an biochemical environment. The carbon source will only be decomposed and acidofied and will not be completely decomposed into carbon dioxide. Therefore, a large amount of organic matter entered the aerating tank, resulting in an increase in the concentration of nitrogen and nitrogen. The solution was to stop the water from entering and start the explosion.
4. Low pH. Low pH. The solution was to start adding base to maintain the pH when the pH continued to drop, and then find the reason through analysis.
It should be noted that the above reasons are only speculated based on the search results provided. The specific situation needs to be analyzed and resolved according to the actual situation.