Although it is already the first month of the year, the cold of spring in the south often makes people feel colder than the weather of the winter wax moon.

The wheat will not be harvested until May or June, but by this time the paddy fields that have been cultivated in this valley have reached the scale of thousands of acres.

Since it was thought that a large number of machines would be used for cultivation from the beginning, these paddy fields were not divided into small pieces like in the real world.

In addition, the slope of this valley is not large, so it didn't take much effort to level the large paddy fields, and ridges were built in suitable places.

Wei Minsheng felt a little regretful when he saw the sandy soil in the large paddy field, because such soil quality was not conducive to water and fertilizer retention.

The little silt in the fish pond is not enough to improve the soil quality of thousands of acres of paddy fields, even if you add the biogas slurry in all the biogas digesters in Huaxia, it is equivalent to a drop in the bucket.

So, Wei Minsheng hit the idea to the sewage treatment plant that had asked Liu Mengling and them to contact.

Due to the time difference, it is only November in the real world, and although the temperature is already low, the water in Nanan Lake still emits a foul smell.

Occasionally, a few fish swim by, and countless green particles are surging in the tumbling water, which is a typical example of eutrophication in the water body.

If this eutrophication continues to worsen, the abundance of organic matter in the water will deplete a lot of oxygen and even affect the survival of fish, just like the Dianchi Lake in Yunnan, where it is almost impossible to restore its natural purification capacity.

Since the water quality of Nanhu Lake does affect the lives of the surrounding people, Liu Mengling and her team have been contracting the sewage treatment plant very smoothly.

Not only did the local ZF not charge any contracting fees, but even decided to allocate 500,000 yuan a year for sewage treatment, the only requirement was to be able to see the clear water of Nanhu Lake before the Spring Festival.

To see the clear water of the lake, it is easy to say, but it is very difficult to do, because this South Lake is part of the sewage treatment system of the whole county, and it is a very important part of it.

For a city with severe water shortages, it is already difficult to provide water for all its residents, and it is impossible to divert water from the surrounding reservoirs to flush the city's sewers.

Only the reclaimed water cycle treated by the sewage treatment plant can be used to gradually improve the water quality, but the small lake, which covers more than three hectares, has a storage capacity of about 100,000 tons.

If water quality is to be improved by circulating water, the total sewage treatment capacity will definitely reach nearly one million tons.

Moreover, this treatment capacity is only the treatment capacity to achieve the short-term target, if you want to maintain this effect throughout the year, it is impossible to complete the task without purifying tens of millions of tons of domestic sewage.

If the company really only needs to allocate 500,000 yuan a year for sewage treatment, it is equivalent to less than five cents per ton of sewage.

According to the treatment cost of the previous sewage treatment plant, not counting the investment in site and equipment, the cost of sewage treatment per ton is about five cents.

The local ZF and environmental protection departments simply felt that a big pie had fallen on their heads, and it only took 500,000 yuan to give the whole city a new look of sewage, which should be a big political achievement.

After signing the contract, even Liu Mengling and the others felt that this was simply a pit that would never be filled, and they didn't know what Wei Minsheng was crazy about, so it was better to donate a sum of money directly to protect the environment.

Of course, if Wei Minsheng didn't have another world, it would definitely be an unwise decision, but with the resources of another world, all this became very simple.

Under Wei Minsheng's arrangement, several pumping machines were installed at the outlet of the South Lake, continuously pumping the nutrient-rich water from the South Lake into the city's sewers, constantly washing the sludge deposited in the sewers with abundant water, and then flowing to the sedimentation tank of the sewage treatment plant.

Of course, this is just a false appearance, making everyone think that the sewage treatment plant is running at full capacity to treat the wastewater.

In fact, whenever the sewage flowing into the sedimentation tank is about to overflow, it will be transported by Long Hao to Wei Minsheng's shared space, and then transferred to the fish pond in Huaxia Villa through Wei Minsheng.

A pumping machine has also been installed there, which constantly pumps the sewage into the newly cultivated paddy fields.

In the beginning, this sewage flows to the sandy loam soil and is constantly absorbed by the sand, and a large amount of sewage is filtered through the sand and then seeps away.

However, as the organic matter-rich sewage continues to flow into the paddy fields, the organic matter gradually fills the gaps in the surface sand, and the water and fertilizer retention capacity of the paddy fields has been rapidly improved.

The only thing that makes people feel uncomfortable is that around the thousands of acres of paddy fields, there is no longer a smell of fresh earth, only a foul smell wafting in the valley with the wind.

The real-world pumping effort lasted a whole day, and during this day, the entire county was filled with the unique smell of South Lake water.

Although it is a little uncomfortable, everyone knows that only by washing with a large stream of water can the old sludge accumulated in the sewer be cleaned.

After all, such things don't happen often, and everyone understands that they can endure discomfort for a day in exchange for being odorless in the future.

Many of the residents who were playing around saw that after the green water of the lake was drained, the bottom of the lake was covered with black silt, and some people who went to fish almost got stuck in it and couldn't climb out.

Of course, more of the fish in the lake were taken over by the staff of the city administration, because they said that it was an asset of the city and that they should handle the fish.