Chapter 2998 Sewage is also water and can be used rationally
Facing the curious eyes of everyone, Yang Fang continued: "The water flow of this stream is actually very limited, because the water we transfer from more than a hundred kilometers is also limited, and it must support the daily life of our entire park.
and water for scientific research and production.
Only excess water will be discharged from the artificial lake and flow into this stream. However, as the scale of our Northwest Research Center becomes larger and larger, water consumption also rises sharply, so the water flowing out of the artificial lake
There are also fewer and fewer.
In addition, this place is located in the hinterland of the Gobi desert, with harsh natural conditions and high evaporation, so the river water may have completely penetrated and evaporated after flowing out for a few hundred meters.
Therefore, we set our sights on the wastewater treatment of the entire Northwest Research Center. Every day, our Northwest Research Center produces a large amount of water for domestic and scientific research.
Except for part of the water that can be recycled and reused, most of the other water cannot meet the secondary use standards. It would be a pity to discharge it in vain or let it evaporate."
What Yang Fang is talking about is actually a way of treating sewage in the northwest region or many areas. In addition to the very rough direct discharge, most of the sewage now needs to be treated by sewage treatment stations before it can be discharged.
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To put it simply, the sewage is subjected to a series of methods such as sedimentation, filtration, neutralization, and purification to make the sewage reach dischargeable standards before it can be discharged.
This does not mean that the sewage that has been treated by the sewage treatment plant is not polluted or has problems. It is like that. At least, until the indicators of relatively minor environmental pollution in the sewage reach the prescribed licensing requirements,
Only then can emissions be retrograded.
However, sewage treatment plants require money to operate, and the cost of treating sewage is not cheap. Therefore, few companies have illegal discharges, or the sewage treatment plants are not operating according to the prescribed standards.
Does the treated sewage meet environmental standards, etc.
In arid areas, because there are rivers that cannot be directly discharged, and in order to lower the standards for sewage discharge, another method is used to treat sewage. To put it more complicatedly, it does not rely on the very weak evaporation in arid areas.
, discharge the sewage outside some pools, and then evaporate it through sunlight, so that the sewage becomes water vapor and evaporates.
"How to rationally use the sewage has also become a topic of internal discussion among you." Shen Ning took over Yang Fang's words and said: "As for the use of the sewage, you have very few internal opinions, and no one has suggested establishing a
The recyclable water treatment center regenerates the sewage for reuse.
Those sands are very rich in chemical substances, and you will filter, recycle, and then treat them harmfully to avoid environmental pollution."
The sewage needs to be treated so clean that it meets human standards. All you need to do is make it meet the discharge conditions. Then discharge it into the desert, intersect with the river, and then form an inner river in the desert.
Flowing river, then you can use the inland river as a water source and plant various trees around it to form a Populus euphratica forest."
Very slowly, another set of plans is presented to you. This is not to build a small sewage treatment plant consisting of a solar photovoltaic power station and a sewage evaporation treatment system to treat the sewage.
Yes, it is necessary to build a few small evaporation pools, and those pools need to be carefully treated by infiltration to prevent sewage from seeping out of the soil and contaminating deep ground water.
Outside is the desert Gobi, which is the most water-scarce place. Although it is sewage, it is also water.
The sewage will be evaporated by sunlight, and the clean water will evaporate through water vapor, and the remaining pollutants will not be pollutants in the sewage.
So, Mr. Wu, you think that the sewage can be wasted, and instead of just evaporating like that, you should use it rationally."
"Yes," Wu Hao smiled and nodded. Then he walked to the river and squatted down. He held up the river water with his hands and showed it to several people: "Forty percent of the water in that river is yours."
Sewage treated by sewage treatment plants.
That in itself is not a very bad purification method. For example, the desalination of seawater that you are accustomed to uses is the same method to obtain fresh water from seawater.
The method of relying on evaporation is very cheap compared to the method of treating sewage in sewage treatment plants, and it is also the most commonly used method in arid areas.
"Is that all sewage? Why do you think the water is so clear?" Deputy Director Cheng looked at the turbid water flowing outside the river.
Wu Hao, on the other hand, continued with a smile: "In order to prevent the filtration capacity of the sand used for filtration and penetration from weakening over time, you will regularly close the gates on both sides and replace the sand.
According to our suggestions, the recyclable water treatment center cannot use the weak sunlight to evaporate the sewage to obtain purer distilled water for seven times, nor can it use solar photovoltaic power plants to supply the recyclable water.
The reclaimed water treatment center is de-energized. In this case, it will operate independently and the cost of treating sewage cannot be reduced to a very high standard.
After listening to Yang Fang's opinion, it seems that we didn't do that.
You have not built a large dam at the outlet of the sewage treatment plant. That dam was built using anti-seepage technology, so it cannot prevent the sewage from seeping into the ground.
Although the water can be used as domestic water, it has not yet reached the seventh water use standard. Of course, this is also due to the unique natural environment.
Sure enough, you smiled and said: "But in your opinion, Mr. Wu, it is really a pity to let that sewage evaporate in vain.
"So that's it." Everyone started to admire after hearing this. The troublesome sand outside actually didn't filter the sewage.
Sand itself has no ability to purify water, which is why it makes the water so turbid.
However, the investment in the later construction is too small. All in all, it will cost billions to complete and put the system into operation. The cost is really not low, so you have to give up that plan.
And at the outlet of the dam, you designed an ordinary sluice. It is a lower sluice. In the middle of the sluice, there are piles of desert sand. Those sands are not very bad filtering materials. They are not good.
For the sewage before treatment, the sewage is filtered and clarified, so the sewage seeping out of the sluice is not very turbid."
