Chapter 273: Land reclamation
The seaside of Changli County.
A old factory near the sea was acquired by Hailufeng Company, and the renovation project has been completed.
Hailufeng Company Changli County Seawater Desalination Factory. "Manager, the company has obtained the approval for reclamation."
"Get it?" Factory director Dong Weihua took the document and looked through it carefully for a while. A smile appeared on his face: "Okay, okay, now we can finally let go of our hands and feet."
The factory technical director Ren Fangyuan said with a smile: "Manager, the boss can definitely get the approval document, but we can't take it lightly."
"I naturally have no doubts about the boss's strength." Dong Weihua looked at the factory's equipment, and his face was full of smiles. After a while, he put away his smile and continued, "Although this is good news, we still did not produce it with all our strength. After all, the local water plant needs relatively little water, and we don't know when the transportation pipeline will be completed."
Ren Fangyuan, who has been paying attention to this matter these days, shook his head with a wry smile: "Manager, this matter is probably not that easy."
Although the North China Plain lacks water, it is not as short as the Northwest.
Especially after the mass production of new water purification equipment began, tap water plants in various cities in the North China Plain have successively introduced the equipment, increasing the treatment of tap water and sewage, and allowing the water recycling rate within the city to rise sharply.
For example, Beijing, which has always been plagued by water shortages, consumes 2.64 billion cubic meters of production and living water in 2027, with a permanent population of 22.07 million, and an average annual water consumption of 119.6 cubic meters.
This per capita water consumption is obviously relatively small.
Because this water use data does not distinguish between domestic water and production water, and the annual per capita water consumption in Lingnan can reach 316 cubic meters, almost three times that of Beijing.
However, after introducing a large number of water purification equipment, the Beijing tap water system was immediately reborn, and its water recycling rate continued to rise.
Whether it is industrial water, commercial water, or domestic water, they are gradually incorporated into the urban water circulation system.
Under this situation, the demand for seawater desalination in Beijing has declined, and even the enthusiasm for improving the water transfer capacity of the South-to-North Water Diversion Project continues to decline.
Because in the ever-increasing urban internal water circulation system, as the water recycling rate continues to increase, the capital city actually shows no water shortage.
Since there is no shortage of water, there is no motivation to promote seawater desalination.
After all, seawater desalination is also money to be imported into the inland.
Although the price of pure water after seawater desalination is only a few cents per cubic meter, the problem is that water pipelines and supporting facilities require money, and this money still increases with the increase of transportation distance.
Unless you can use natural river channels and natural height differences to deliver water by flowing, the investment cost will definitely be very high.
Refer to the east line plan of the South-to-North Water Diversion Project based on the Beijing-Hangzhou Grand Canal to know the scale of the investment.
And there are large-scale seawater desalination, and many experts and scholars are concerned.
One of the biggest controversy is the by-product produced by large-scale seawater desalination: coarse salt.
For every cubic meter of seawater desalination, about 35 kilograms of coarse salt will be produced.
Dreaming 100 million cubic meters of seawater a year will produce 3.5 million tons of coarse salt. So much coarse salt is difficult to deal with. The chemical industry may be able to eat 10 to 20 million tons of coarse salt. However, once the scale of seawater desalination expands to the level of billions of cubic meters per year, it will be hundreds of millions of tons of coarse salt every year, and the chemical system cannot digest so much coarse salt at all.
Slow pace compared to Changli County seawater desalination factory.
Qiongzhou Gratitude City's seawater desalination factory is in full bloom.
Especially after obtaining the approval document for land reclamation. Why apply for land reclamation?
The answer is to deal with these coarse salts.
Carry the sea with coarse salt?
Yes, not all.
At present, Hailufeng Company's coarse salt reclamation method is to use silicon bean silk fabric as the inner layer, then pour concrete, and use a large amount of silicon bean silk to replace steel bars to create a large salt storage tank body.
Then, after storing the salt, the tank is completely sealed, and then using an airship to the planned area along the coast to reclaim the land.
The service life of these tanks can last about seventy or eighty years, so the next step of treatment is needed.
In order to ensure that these salt tanks do not leak on a large scale in the future, a barrier layer needs to be built along the edge of the land reclamation area to avoid contact between seawater and the coarse salt inside the tank that is broken later.
The reclamation area is used as the industrial area of Hailufeng Company.
The current planned production capacity of the city's seawater desalination plant is 800 million cubic meters per year, which will generate about 28 million tons of coarse salt, and the volume is about 13 million cubic meters.
With the shell of silicon bean silk concrete, the total volume can reach about 14 million cubic meters.
Thanks to the fact that the sea water along the coast of the city is not deep. So many solid tanks of 14 million cubic meters can be reclaimed about 2,000 acres.
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In other words, thanks to the six seawater desalination factories in the city, which can reclaim about 2,000 acres of seawater every year.
Of course, as the reclamation area extends to the outskirts, the depth of seawater will gradually increase, and the area where land reclamation can be gradually reduced.
However, this kind of reclamation seems to require some soil and rock to fill the gaps. At the same time, considering that the foundation is to be built, a cofferdam must be built in advance.
This land reclamation project is also a relatively convenient thing for Qiongzhou Island. If it is in the Bohai Bay, since it is the inland sea, land reclamation and land reclamation within the Bohai Bay is a very unprofitable project. It will mainly reduce the area of the inland sea and affect the ecological environment of the Bohai Sea.
If it was the coastal areas of Qilu and Su Provinces, it would face the Yellow Sea and the East China Sea directly, and the impact of land reclamation would not be too great.
After a hundred years, this land reclamation project will form a large area of artificial salt ore underground, which can be used as resource reserves and land, and can also obtain a large amount of fresh water.
It is more safer than storing it on land or burying it with an abandoned mine cave, and it will not occupy space. It also allows these coarse salt to be used.
As the salt stone land-making project continues to extend to the outer sea, the newly built land is on the periphery and the old salt stone land is on the inside. Even if the tank is aging and cracked, it will not leak out.
Unless a major earthquake occurs in the local area, which instantly tear the land apart or sinks to the bottom of the sea, it may cause large-scale leakage.
But thankful that the area outside the city is not a traditional earthquake zone. If it is the sea area near the Qiongzhou Strait, then we really need to consider the situation of major earthquakes in the future. After all, in history, the Coconut City in Qiongzhou was hit by a major earthquake, causing a piece of land to sink to the bottom of the sea.
At present, the salt stone land-making technology has been comprehensively tested along the coast of the city. If no serious problems are found, then the seawater desalination factories in coastal areas across the country will use this method to deal with excess coarse salt.
In view of the ecological impact, the Bohai Bay area is still mainly self-circulating inland cities and industrial water. If freshwater in the North China Plain is really not enough in the future, it can only be solved by large-scale seawater desalination.
Therefore, both technical directions are advancing.
In fact, there is another solution for experts and scholars from all over North China, which is artificial lakes.
By digging the remains of ancient lakes and then re-forming lakes, these lakes can enhance the overall water storage in the area and increase the local self-circulating water upper limit.
(This chapter ends)