After determining the development direction of Minsheng Canteen, Wei Minsheng returned to the other world with a large number of seeds, livestock, production materials and recycled stainless steel lunch boxes.

For these lunch boxes that need to be cleaned, thinking that the use of a large number of chemical cleaning and cleaning in the real world has caused eutrophication pollution to water resources, which is serious like Dianchi Lake, a lot of manpower, material and financial resources have been invested, and the remediation effect is still not good, and even the fish in the water body are difficult to survive.

Although there is not so much nitrogen-containing wastewater discharge in this world, there are also a lot of tableware that are cleaned every day, and we must strive to do a good job of harmless treatment to avoid going down the same path.

For example, the cleaning work in the kitchen is almost inevitably dealing with oil stains, and if you want to eliminate the use of dishwashing detergent at all, the cleaning effect will be problematic.

After observing the cleaning process, Wei Minsheng found that due to the good sealing of stainless steel lunch boxes, there are still a lot of food residues in these lunch boxes.

Cleaning up the residue is time-consuming and laborious, and it also increases the amount of detergent used. The fish pond I dug earlier can't withstand such a large amount of wastewater digestion capacity, and it is not a good way to discharge it directly outside the valley, after all, no one wants a stinky ditch to emerge from their gate.

In order to solve this problem, Wei Minsheng simply used the method of high-temperature cleaning, set up a large cauldron, used dried plant stems and leftovers from the wood processing process as fuel, took out the sealing gaskets in these lunch boxes, and boiled them directly in boiling water.

Under the action of boiling water, the oil stains in the lunch box floated on the surface, and the food residue sank to the bottom. Looking at the sewage in the eyes of these "modern people", Wei Minsheng suddenly thought: this high-temperature oily sewage does not add any chemicals, unlike the water collected in other schools and restaurants, because of the large use of disinfectants and detergents and other chemicals, and the collection method is not standardized, it is easy to produce germs, so everyone feels unhygienic. But what you produce by processing it like you yourself is all leftovers from human eating, so why can't you use it to feed the pigs?

In the past, pigs in the countryside were almost always fed in this way to deal with the leftovers at home, and now the pigs fed by the feed feel a little cleaner, but who knows what kind of clenbuterol is added to the feed.

Even the pork available in the market is fed with unhygienic water in schools and restaurants, and the relevant departments have not made an authoritative statement.

Wei Minsheng feels that the focus of these arguments is nothing more than whether the water contains toxic chemicals, which may be absorbed by pigs during the feeding process, thus posing a potential danger to those who eat them.

As long as we strictly control the treatment process, use physical heating completely, and eliminate the use of chemicals in the collection process, the reuse of this water can not only reduce environmental pollution, but also generate new value.

As for the problem of excessive grease and salt content in the water that some people on the Internet say, it is not impossible to solve it, and a large number of damaged vegetable leaves that are cleaned up when packing vegetables and making dishes every day in my villa have also found a way to deal with them.

There are also some bones and other things in the residue at the bottom of the pot, which are directly scooped up and broken, and these calcium are essential elements in the growth process of pigs.

After the wheat is harvested, the straw is used to feed the cattle, the wheat bran is used to feed the pigs, and then the chickens are driven to the harvested wheat fields for a while to clean up the fallen wheat and insects.

After pig and cow manure are treated through the biogas digester, they can not only provide biogas in daily life, biogas slurry, biogas residue and grass ash in the gas power plant, but also good organic fertilizer, and produce some manure and compost in a planned way, which can be used to plant vegetables to improve soil quality.

As for the various hormone drugs used in a large number of other pig farms, Wei Minsheng is not interested at all, he has time in the other world, and it is better not to use these things that violate the law of growth.

On the tip of the tongue, I can't control others, but I can still manage it in the villa.

After these lunch boxes are treated at high temperatures, only a small amount of detergent is needed to achieve the purpose of cleaning, and the nitrogen-containing wastewater produced by these small amounts of detergent enters a special biogas digester for treatment, mainly for precipitation and simple anaerobic treatment, so that targeted anaerobic flora can be gradually cultivated, and the treatment capacity can be improved, so as to avoid affecting the bacterial species of other biogas digesters.

A small amount of nitrogen-containing wastewater is actually beneficial to the water environment, it can promote the reproduction of algae in the water, and the increase of algae will provide a food source for plankton in the water body, and plankton will eventually become food for fish, which is the theoretical basis of fish farming in fertile water.

However, in reality, in order to create more economic value in a limited time and space, some people have taken the method of fish farming in fertile water to the extreme, and even used this method in large quantities in reservoirs, resulting in the disconnection of the ecological circle and causing serious ecological disasters.

Pollution is easy to recover and difficult to recover, especially in large areas of water pollution, the ecological circle chain is broken and its own purification ability is almost completely lost, and the ecological circle of the water body cannot be closed, which leads to more serious ecological deterioration and eventually turns into a pool of stagnant water.

Therefore, Wei Minsheng is deeply disgusted by this way of artificially adding fertilizer to the water body to raise fish, but in the treatment of a small amount of nitrogen-containing wastewater, as long as it is controlled to a degree, it will not only not cause ecological deterioration, but prevent the pollution of nitrogen-containing wastewater to the environment, and the fish in the fish pond can also get more natural food, which is indeed a very good way to deal with it.

Considering that some customers cannot return the lunch box in time for various reasons, resulting in moldy and rotten deterioration of the residue in the lunch box, Wei Minsheng requested that when the lunch box is recalled, according to the collection time record of the lunch box, the staff will paste a yellow label on the returned lunch box as an identification.

In this way, the person who cleans the lunch box will treat this kind of lunch box separately, and this kind of water is no longer suitable for breeding, so it is discharged into the biogas digester after cooling to the right temperature and used as fertilizer for harmless treatment.

In order to prevent competitors from maliciously poisoning the recycled lunch boxes and causing losses to pig farms, Wei Minsheng asked the personnel involved in the processing of lunch boxes to find abnormal food residues in the process of work.

At the same time, the mode of point and batch treatment was determined, and the lunch boxes recovered by each meal point were processed at high temperature in batches, and the water generated was registered and used in batches, and the water recovered by each meal point could be checked in which places.

In this way, even in the event of a possible poisoning incident in the future, it is possible to quickly find the problematic pick-up point and effectively minimize the possible damage.