After the separation of this artificial embankment, Dianchi Lake has formed two lakes, one large and one small, the area of the small lake accounts for about one-third of the Dianchi Lake, and the area of the large lake accounts for about two-thirds.

In order to prevent the possible impact of unexpected flooding, Minsheng Company also arranged for personnel to build a temporary flood discharge pipeline between Haikou and the artificial embankment to prevent the danger caused by the overflow of the embankment.

The narrowest part of the sea is only more than 100 meters, and in order to prevent the lake from backing up, it is also isolated by a dam, completely cutting off the direct connection between the small lake and other water bodies.

At the same time, a large sewage pumping station was built in the middle of the embankment.

In order to achieve a faster construction schedule, instead of using a traditional concrete structure, the wastewater pumping station opted for an integrated prefabricated pumping station with a relatively small drainage capacity but easier to install and deploy.

An integrated prefabricated pumping station is equivalent to a traditional small pumping station, each with a complete control and monitoring system to ensure the stability of its work.

More than 100 large-scale prefabricated pumping stations with a pumping capacity of 5,000 cubic meters per hour constitute an array of pumping stations.

At full power, the total pumping capacity of the sewage pumping station can reach 200 cubic meters per second.

Under the coordination of Minsheng Company's strong project scheduling capabilities, the sewage pumping station was completed almost simultaneously with the closure of the embankment.

After the dam completely blocked the flow of water from the upstream lake, the earth-rock trucks continued to compact and raise the dam to ensure the stability of the dam.

Although such a simple earth-rock embankment is not stable with the embankment of those reservoirs.

But after all, its purpose is to block the water of the lake at a depth of up to 10 meters, which is strong enough, so there is no need to build it entirely with stone or cement.

In the process of raising the levees, a large sewage pumping station, which Wei Minsheng is solely responsible for, also began to work, pumping heavily polluted water from the small lakes into the larger lakes.

More than 400 million cubic meters of water is not a small amount, and the electricity consumption of a sewage pumping station at full power is not a small number.

So, with shared space, most of the sewage pumping stations are really just a fixture, and there are only a few pumping stations in operation to show that the sewage pumping stations are working non-stop.

At night, Wei Minsheng keeps transferring sewage from the small lake to the big lake through the shared space.

The shared space has the transfer capacity of more than 20,000 square meters at a time, and it can easily complete the task of transferring tens of millions of cubic meters of sewage in one night.

The shared space can be operated within a certain range, and it is possible to cross the embankment to take water from below the water surface, and when releasing water, it is also operated under the water surface.

Therefore, Wei Minsheng can complete the whole operation by lying on the embankment without being noticed by others.

The height of the levees is slowly increasing, but so is the water level in the lake.

In less than a month, 80 percent of the sewage in the small lake has been diverted into the large lake in less than a month.

As a result, the average water depth in the lake reaches eight meters, and the area of the lake water in contact with the air is further reduced to half of the original area, directly reducing the amount of natural evaporation by more than half.

The water in the small lake is drained, and the silt around the lake that can be treated directly is removed by machinery and sent to a sewage treatment plant several kilometers away for treatment.

The sludge cleared out of the lake is rich in a large amount of organic matter, which can be transported to other places after treatment and used as organic fertilizer for planting base fertilizer for harmless treatment.

In fact, a large amount of nutrients in the water body of Dianchi Lake mainly come from these silts, and after these silts are cleaned away, they will also reduce the ammonia and nitrogen seeping into the water in the future in disguise.

Ordinary machinery can only clean up the relatively dry silt around the small lake, and there is no way to deal with the large amount of mud that exists in the middle.

At this time, the six-kilometer-long sewage discharge pipeline, which was laid at the same time as the treatment project, came in handy.

Due to the high terrain of the sewage treatment plant, Minsheng Company built a temporary sewage storage tank in a low-lying area near the treatment site.

After the sludge in the small lake of Dianchi Lake is stirred into mud, the sludge is transported to the temporary sewage storage pond through this sewage discharge pipeline.

The slurry from the temporary storage tank is then transported to a higher sewage treatment site by a high-pressure slurry pump.

The primary treatment facility at that sewage treatment plant consisted of a series of sedimentation tanks that formed a radial chain of pools from the inside out.

In the middle is a pool of 100 meters in diameter and nearly 20 meters deep, surrounded by three circles of smaller pools.

The three circles of basins are composed of eight, sixteen and thirty-two pools, and the number of sedimentation tanks is halved with each circle when the sewage is deposited from the outside to the inside.

The high-concentration slurry pumped up by the mud pump circulates into the 32 outer pools through the pipeline, and after sedimentation, it enters the next circle of sedimentation tanks for re-sedimentation, and finally the middle layer of clean water flows into the middle of the large pool.

Since these sedimentation tanks mainly deal with high concentrations of silt, there is no need to build cement ponds, just dig some large pits with excavators and connect them with pipelines.

When the remaining sludge in the outermost sedimentation tank is almost full, the silt in the sedimentation tank is removed by an excavator and stacked in a higher place around it for dewatering.

The water in the middle that has undergone primary sedimentation treatment flows back to the small lake edge of Dianchi Lake through another pipeline, and the silt at the bottom of the lake is converted into high-concentration mud under the action of high-pressure water guns.

Through this cycle, the silt from the small lake is continuously transported to the sewage treatment plant.

In addition, a circular ditch with a diameter of 1.2 kilometers was cleared from the middle of the embankment in the small lake with a high-pressure water cannon.

After draining the stagnant water in the ditch, enough cement piles were driven into the annular ditch, and a ring of reinforced concrete beams was poured along the top of the cement piles along the annular ditch.

Three such annular ditches were built in the small lake, and by the time the third reinforced concrete beam was repaired, the first annular girder had reached its curing period.

The ring beam is then heightened with stone, and the surrounding silt is dug into the ring beam and accumulated.

Under the action of gravity, the water in the silt flows out through the cracks of the surrounding stones, so as to achieve the purpose of mud and water separation.

With the gradual rise of the annular stone wall, the accumulation of silt in it is also increasing, gradually forming a roundabout more than ten meters high.

The size of these three roundabouts is almost exactly the same as the size of the urban units in Huaxia and Tuvalu.

However, in this Dianchi Lake, it is certainly impossible to build underground buildings, and these spaces are completely used to hold the silt that has been cleared from the bottom of the lake to reduce the cost of cleaning and transportation.