Look back home.

Yang Bai, the chief researcher of the rock-forming laboratory, and others are near the mouth of the Liao River in Panjin City, Liaodong Province.

Last year's and this year's desalination plans have initially met the needs of the North China Plain, the Guanzhong Plain, and about 46% of the Loess Plateau.

Beginning in September, Yang Bai and the engineers of the seawater desalination management company came to the vicinity of the mouth of the Liaohe River.

In fact, there are also not many water resources in Northeast China, and there are still very serious problems in the Liaohe Plain, Songnen Plain, and Sanjiang Plain in Northeast China - land salinization, soil erosion, and land desertification.

It seems that the water resources of the Northeast region are good, with a total of about 200 billion cubic meters, but the Northeast, as a major agricultural region, consumes hundreds of billions of cubic meters of water resources every year.

The total amount of water resources in a region does not represent the total amount of water available, and in fact, 30% of the total available water resources are almost at the top.

Where does the rest of the water come from?

Of course, the extraction of groundwater and the large-scale and long-term use of groundwater to irrigate farmland will cause land salinization, and many farmland uses excessive amounts of chemical fertilizers, further deepening the degree of land salinization.

Because the mineral salt content of groundwater is relatively high, after irrigating farmland, the mineral salts will slowly accumulate in the soil, forming a layer of "salt crust", which will cause land compaction and make it difficult for crops to grow.

Excessive agricultural reclamation will cause a rapid decline in the natural fertility of the land, which in turn will lead to land desertification and soil erosion, which in turn will prompt farmers to increase the use of chemical fertilizers and deepen the degree of land salinization, which is a vicious circle.

At present, the salinization area of the Liaohe Plain is about 30%; The salinization area of the Songnen Plain is about 75%, and the desertification is about 50%. The salinization of the land in the Sanjiang Plain is about 10%.

It can be seen that the land situation in the northeast is not much better than that in the northwest, and the rate of deterioration is even faster due to the impact of excessive agricultural reclamation.

How to solve the problem of land desertification and land salinization

The simplest and most crude way is to return farmland to forests and grasslands.

However, this possibility and enforceability are very low, and as an important domestic commercial grain and soybean planting area, it is impossible for Northeast China to return farmland to forest and grassland on a large scale.

However, in the past few years, the situation in the northeast has improved greatly, thanks to the promotion and development of rural cooperatives and greenhouse farms.

After all, much of the land has been built directly into glass greenhouses or agricultural buildings, so that soil erosion can be curbed.

In addition, refined fertilizer and drip irrigation technology have further suppressed land salinization.

However, the problem of over-exploitation of groundwater has not been completely solved, and only by solving the problem of using groundwater for irrigation and irrational use of chemical fertilizers can we fundamentally curb land salinization.

Due to the experience of saline-alkali land transformation in the North China Plain, it is currently a general saline-alkali land transformation program, which is developed by the Institute of Agricultural Saline-alkali Land Research of the Chinese Academy of Engineering.

In the first step, fresh water is used to flood 5 times with pure water, each time for about a week. This step dilutes and dissolves the mineral salts in the soil and carries them away with the river.

The second step is to use livestock manure, kitchen waste, and dead branches and leaves of plants to make organic fertilizer, which is deeply cultivated and incorporated into the farmland soil.

In this way, the soil transformation of saline-alkali land can be initially completed, and then gradually adjusted with fresh water flood irrigation and organic fertilizer in the cultivation process year by year.

In terms of organic fertilizer, Huanong Group has regular collection in farms, pastures, breeding farms and rural cooperatives across the country, and then makes organic fertilizer in a centralized manner.

The only problem now is water.

Therefore, the desalination management company and the rock-forming laboratory were ordered to come to the mouth of the Liaohe River to build a desalination plant.

With a large number of new humans on board, desalination management companies and rock-forming laboratories are already very powerful.

Next to the construction site of the desalination plant is a water conveyance plant.

However, at this time, the water transmission plant is directly pumping seawater from the Bohai Sea, which is directly used to make water pipelines.

These water pipelines have now extended more than 30 kilometers to the north, and they are advancing very quickly.

After all, the direct generation of pipelines with rock-making agents only requires the binding of steel skeletons in advance, plus special mobile pipeline templates, and the pipeline manufacturing speed is very fast.

It is not a problem to advance more than ten or twenty kilometers a day, unless you encounter complex terrain such as mountains.

The excavator excavated a large pit, and the crane quickly put the steel frame of the base into the large pit, and then the formwork was closed.

The next step is to arrange the inner formwork of the pipeline, the reinforcement frame of the pipeline, the outer formwork on the base, and the calculated rock-forming agent tied to the reinforcement skeleton.

About ten kilometers were laid, and an engineer pressed the water switch.

From the previous gate valve, a large amount of seawater rushed to the outlet of the pipeline, directly poured into the inside of the formwork, the seawater and the rock-forming agent reacted rapidly, and the artificial rock began to fill the steel skeleton, and in less than half an hour, the pipeline was formed.

This is the charm of technology, the weapon that changes the world in the hands of believers in truth.

"Han Chao, how is the arrangement over there," Yang Bai asked.

Yu Hanchao, who was looking at the adsorption box, raised his head and replied: "16 kinds of adsorption boxes have been arranged, all of which are the latest versions of adsorbents. "Seven or eight Chinese geniuses memorize ωωω.78zω.còм м.7.8zщ.cóм in one second

Yang Bai asked curiously: "I heard that there is a lot of gold and silver refined by seawater recently!" ”

In terms of seawater trace element refining process, Yu Hanchao is in charge, and Yang Bai is responsible for the seawater macroelement refining process.

"The management company collected 16 tons of gold and 176 tons of silver this month, which is simply a double profit." Yu Hanchao said with a smile.

However, Yang Bai shook his head and smiled bitterly: "I have a headache here, and those tens of millions of tons of sodium chloride are almost filling the warehouse." ”

"Isn't the management company in contact with the chemical plant?"

Yang Bai helplessly spread his hands: "Chemical plants can't eat so much sodium chloride, don't you look at how much sodium chloride our desalination plants produce every day." ”

Yu Hanchao thought for a while and proposed: "We can set up a sodium chloride deep utilization laboratory to study other applications of sodium chloride, such as combining with silicates as a house construction material." ”

"That's a good idea."

Anyway, now engineers and researchers are about to be flooded, and a lot of talents are grabbed, anyway, there are the most things in the country now, and there are the most research institutes and laboratories.

The scale of many research institutes and laboratories has expanded by several times, and even by hundreds of times.

In addition to the desalination plant at the mouth of the Liaohe River, there are already three desalination plants in operation in the coastal area of the Bohai Rim, and three more are under construction, including the Liaohe desalination plant.

In the newly established seawater desalination plant project, the water pipelines are all using the seawater rock-forming propulsion method, and the rapid advancement to the inland areas is rapid.

For example, the straight-line distance from the mouth of the Liaohe River to Hulunbuir is more than 1,000 kilometers, and the terrain in the northeast is gentle, and the entire water pipeline is about 1,300 kilometers.

With the seawater rock-forming propulsion method, coupled with the planned and designed sectional laying of frame formwork, the whole line can be completed in one or two months.

That's a speed that can crush all construction companies, and building 1,300 kilometers of water pipelines in two months, with reinforced concrete or metal pipes, can't do that at this speed.

These water pipelines, which can run cars inside, are spreading to the northeast, northwest, and Mongolia at a very rapid speed.