Chapter 76

"What are these?" In the central room of the air circulation pipe in the shelter of the police station, uncle Ding looked at the things on the shelves in front of him and asked, "looks like a glass plate?"

A technician who was debugging the equipment heard uncle Ding's question. While continuing his work, he explained to him: "this is an algae culture tank. The standard name is biological reaction facade..."

After checking the condition of a biological reaction facade, the technician continued: "of course, from the material point of view, you can really call them glass plates. These are all made of plexiglass. The facade is hollow. After filling the culture medium, water and carbon dioxide will be used to propagate algae."

Looking at thousands of pieces in front of us, and still installing more biological reaction facades, the manager of the city police station with Uncle Ding asked, "can they be used to supply oxygen? By the algae? "

"Yes, by the algae." The technician nodded and tapped a biological reaction facade on one side with his finger: "these algae will get the light energy required for photosynthesis under the sunlight. We fill carbon dioxide into it through the pipe at the lower end of the facade to make the algae inside carry out photosynthesis, while the pipe at the top is responsible for collecting the oxygen released by these algae to supply the oxygen The air circulation system of the shelter is used. "

"That's all What's the facade of biology? " Another manager also spoke, revealing a strong suspicion and Distrust: "can these things be used by 20000 people in this refuge?"

When the manager spoke, the managers of the city police station all had the same look on their faces.

It's not that these managers don't know how to pretend to understand or despise the technicians, but the thousands of glass plates installed here can supply the oxygen consumption of the whole refuge, which really makes people doubt whether it can really do it.

"These biological facades use microalgae biological reaction oxygen production technology. In the past, the German people had done a similar technology experiment, and built a building house with this biological reaction inside to build an external wall. The biomass produced by such a biological house after reaction can provide enough heat and electricity to meet the needs of the surrounding three houses." The technicians were not surprised by this, and continued to explain to the managers of these municipal police stations.

After all, it's about the life and death of more than 20000 people in this shelter, and the technicians feel that they really should explain it more clearly.

"We have improved this technology. Originally, we intended to take it to the submarine for experiment, to see if it can be used as the oxygen supply system of the submarine, so as to improve the stay time of the submarine underwater." The technicians did not hide the fact that this was originally a military experimental technology, but continued: "the efficiency of algae in producing oxygen is actually the highest among all the organisms on the earth. 70% of the oxygen on the earth comes from the marine ecosystem, so it is absolutely no problem to rely on algae to supply oxygen for the refuge in theory.

As for whether oxygen generation can guarantee the survival needs of 20000 people, please don't worry. The system is designed to meet the needs of 30000 people.

Moreover, although the oxygen content in the outside air will decrease, it is not to say that it will decrease to the point where human beings can not survive, but the oxygen content will decrease to a degree similar to that in plateau areas. The main purpose of this system is to prevent carbon dioxide deposition and oxygen deficiency caused by underground structure in the shelter after the oxygen content decreases. "

The technical staff's explanation reassured these managers. After listening to the explanation, several people in charge of logistics discussed something.

"Do you say that the oxygen content of the external environment will not drop to the point where human beings cannot survive?" When the technicians mentioned the problem of oxygen content in the outside world, uncle Ding was particularly concerned about it, because the special police force is currently the most out of the field department in the police station, and he was very concerned about it.

The technician seems to be very interested in solving this problem. He stops his work and explains: "the total amount of oxygen in the earth's atmosphere is about 10 billion tons, and the oxygen a person breathes is about 270 kg per year.

Even if calculated by 0.3 tons, even if the earth's 7 billion people are still alive, it will take 550000 years to consume all the oxygen in the atmosphere, and it will take thousands of years to reduce the oxygen content by 1%. "

Speaking of this, the technician laughed and jokingly added: "of course, in fact, it is impossible. Even if the atmospheric environment drops by only one or two percentage points, it is enough to cause human hypoxia reaction. If the oxygen content in the atmosphere is less than 15%, it is enough to cause serious consequences.

The previous meteorite impact and global fire have consumed a considerable part of the oxygen in the atmosphere. According to the calculation, the oxygen content in the atmosphere has decreased by about 0.5 to 1 percentage point.

In addition, there is no sunlight, photosynthesis is nearly stagnant, and there is no new oxygen in the atmosphere. The oxygen content in the external environment can still be maintained at about 18-15%. Of course, it depends on the region and environment.

However, due to the problems of underground buildings and the ventilation system, the oxygen content in the shelter will be lower than that of the outside world. According to the calculation, if there is no oxygen supply inside the shelter, the oxygen content is likely to fall below 15% and form carbon dioxide deposition, leading to hypoxia. "Hearing the explanation of the technician, uncle Ding nodded clearly, but his brow wrinkled.

Whether the external environment can survive or not, the special police forces need to consider different issues when they go out of the field.

If the external environment cannot survive, the danger of the external environment will mainly come from the bad natural environment, which can be ensured by improving the field personnel's protective equipment and security measures.

However, if the external environment can still survive, but the conditions are worse, there is no doubt that the risk will be greatly increased for the field personnel who go out to perform the task.

In peacetime, there are still many kinds of crimes, such as robbery, robbery and theft. In the end, with the weakening of government control over the city, even within the shelters, there will be crimes. What's more, the wild areas are now beyond the reach of the government?

The technician seemed to see Uncle Ding's worry, and said with a smile, "but you don't have to worry too much, comrade. In addition to the lack of oxygen, the temperature in the wild will seriously restrict human activities in the wild. With the low temperature of dozens of degrees below zero and the lack of oxygen, not many people can stay in the wild for a long time in this harsh environment."

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