Early the next morning, Wei Minsheng saw the materials for building a biogas digester brought over yesterday, and felt that it was better to build a biogas digester first, which could not only solve the problem of human and animal manure everywhere, but also produce biogas for cooking rice or boiling water, and could also generate electricity if it was not used up, and also provide sufficient organic fertilizer for greenhouse vegetables in the future.

Chen Xiaohua bought a soft biogas digester that is used a lot now, mainly because it is easy to transport, easy to build and maintain, and can dig a pit and bury it directly into the ground. Wei Minsheng remembers that the earliest biogas digesters were built of bricks, and it took several days to build a biogas digester, and after it was built, it had to wait for the cement to solidify before it could be used, and it was not easy to repair once it cracked. Later, for a period of time, someone invented an integrated biogas digester made of FRP, which is easy to build, but it takes up too much space during transportation, and the transportation cost cannot be reduced, and there is also the problem of cracking and difficult maintenance. Since the advent of e-commerce, this kind of biogas digester made of FRP has been replaced by this soft biogas digester because there is no way to express it. Wei Minsheng took a look at the manual of this soft biogas digester, this biogas digester is rectangular, and the best gas production temperature is above 15 degrees Celsius, but in this snowy winter, the temperature must not reach more than 15 degrees, what should I do?

When Wei Minsheng was a child, he liked to read some science and technology magazines and books such as "100,000 Whys", and he knew that in the past, some people used wind power to stir the pool directly to convert mechanical energy into heat energy, and some people used hot water generated by solar water heaters on the plateau to heat up the biogas digester to improve gas production efficiency. Of course, Wei Minsheng thinks that the easiest thing is to build a greenhouse to cover the biogas digester, and directly burn hay to raise the temperature in the greenhouse, which is not only convenient for growing vegetables in winter, but also can improve gas production efficiency. Then put a hot water tank in the greenhouse, use a biogas water heater to circulate the water in the tank, directly provide hot water for the two courtyards, the waste heat can increase the temperature in the greenhouse, and the hot water used for bathing and washing vegetables flows into the biogas digester through the pipeline after use, and the temperature in the biogas tank can also be increased, and the all-weather self-production can be achieved after reaching a virtuous cycle.

After making up his mind, Wei Minsheng planned the location of the future greenhouse in his heart, and drew a rectangle 5 meters long and 2 meters wide according to the instructions of the soft biogas digester, and asked the villagers to dig the soil in the rectangle to a depth of more than two meters.

Since there are more and more tools now, it only takes two hours to dig the pit. Wei Minsheng took the villagers to find a stone nearby, made a simple rammed earth tool, and tamped the bottom of the pit.

Wei Minsheng instructed them to clean up a small area, told them how much cement and river sand to use, mixed them with a shovel a few times, then added water and continued to stir until they were completely mixed. Then teach them how to use bricks and cement to build walls. Before building the wall, Wei Minsheng asked the villagers to find some stones to spread under the wall, and fill the gaps with cement to prevent the wall from collapsing due to the unsolid foundation. In order to ensure the quality, Wei Minsheng built the brick wall below the ground to be 24 cm thick, and saved a little above the ground to make it 12 cm thick. After the walls were built, the cement and river sand were mixed according to the standards of the whitewashed walls, so that they could learn to smooth the surface of the brick walls.

Since it was the first time for everyone to use such materials, a lot of cement river sand was wasted in the process of learning, but Wei Minsheng knew that this was an inevitable process, and it was a big deal to spread the cement river sand on the ground to the bottom of the biogas digester after the wall was finished, and it would be regarded as a level.

It took a full day for everyone to finish the pit where the digester was placed.

The next day, Wei Minsheng saw that the cement on the wall had not yet solidified, so he asked the villagers to pour all the cow and sheep dung and dirty weeds from the two courtyards into the dung pit they had dug before, and cleaned all the ditches around the courtyards, and poured the cleaned sludge into the manure pit.

After doing these things, another day passed, and it was estimated that the greenhouse materials should have arrived, so Wei Minsheng took the time to go back to the warehouse again. First, Liu Mengling arranged a purchase plan for the purchase of biogas water heaters, thermal insulation storage tanks, biogas generators, gas appliances, bathing facilities and other things. I looked at the timber in the warehouse again, and two warehouses had been sold out, and there were still two warehouses of timber left. At this rate, I will have to go back to the lumberyard after staying in the Atlas for a maximum of two months. Chen Xiaohua is not in the warehouse now, and he should be going to receive wind and solar power generation equipment. After Wei Minsheng informed Chen Xiaohua, he found a secret place and returned to the other world with the greenhouse equipment.

Early in the morning of the third day, Wei Minsheng summoned the villagers to bring the greenhouse materials to the place where the biogas digester was repaired, and set the baseline according to the relevant information on the construction of the greenhouse, and then taught the villagers to build the greenhouse.

Now this greenhouse skeleton is made of galvanized pipes, all connected with connecting pieces and screws, look at the specifications on the manual, this is a 20 meters long, 8 meters wide vegetable greenhouse.

The installation method is very simple, but there is more repetitive work, Wei Minsheng took everyone to assemble two skeletons, and after having a reference, let them grope for installation by themselves. Because they forgot to buy a high stool, Chen Xiaohua and the others didn't know that they couldn't even find a high stool where they used this greenhouse, so they put the bench on the table, although it was inconvenient, but it did solve the problem.

After the skeleton was installed, Wei Minsheng adjusted the position slightly, determined the position of the biogas digester in the middle of the greenhouse, and arranged the skeleton more neatly. After adjusting the position, Wei Minsheng instructed the villagers to bury the lower end of the skeleton in the soil first, and then cover the greenhouse film on the skeleton and fix it.

Although the things that Wei Minsheng has taken out in the past few days are more strange than the other, and many things don't know how to make them and what they are for, but the villagers have long been numb and used to it, if Wei Minsheng doesn't do something new one day, it feels a little strange, at least for now, Wei Minsheng is still good to the villagers.

Wei Minsheng rested for a night, and went back to the warehouse early in the morning of the fourth day, and the time here was already past 9 o'clock in the evening. Wei Minsheng opened several warehouses and took a look, and a large number of accessories were placed in one of the warehouses, including battery panels, fans, batteries, wires, steel frames, necessary accessories for installation, and some related tools. It seems that this business is more thoughtful, maybe in order to sell more things, all the tools and materials needed in the installation process have been prepared, connecting wire pliers, junction caps These things are available, it should be enough. I sent them a message and then took them to the other world.

Due to the short delay, the time in the Atlas was still past 9 o'clock in the morning. Wei Minsheng took a look at the solidification of the cement of the biogas digester, and it has been three days, although the temperature is low, it should have been "sweated", as long as it is not squeezed by large external forces, it is not easy to be damaged. Wei Minsheng found a few villagers, first cleaned up the sharp objects in the cement pond, spread a layer of advertising cloth, and then lifted the soft biogas digester into the pit.

Because Lu Xiaomei was more careful when connecting the water pipe, and she also had some experience in the application of pipes and glue, Wei Minsheng called her over again, taught her how to connect the gas pipe, and after connecting the gas pipe to the two courtyards, she taught her how to install the desulfurizer, gas-water separator, booster pump, safety valve, gas pipe, switch tee and other accessories according to the requirements on the manual. After installing one side, she asked her to install the relevant equipment of the other courtyard house according to this look. Although Lu Xiaomei is illiterate, because people are more careful, there is no problem in drawing gourds in the same way, and she will be familiar with it after doing it a few more times.