After Li Qing killed the victim earlier, Yang Jianwen abandoned the girl's body near the Wuda Ximen garbage station, so two cases with different causes of death were intertwined. The situation of the dead people at the evil gate garbage station is special, and some unknown substances appeared at the scene, which contaminated the body of the killed girl, so that the police did not realize the complex cause of death in it, resulting in Li Qing, Yang Jianwen and Principal Bai becoming fish that slipped through the net and have been at large, and Principal Bai and they even indirectly participated in the investigation of the case.

Now, the three people sitting in the interrogation room have used their ironclad testimony to testify with great certainty about the crimes of Yang Jianwen and Principal Bai. Moreover, according to some of the original materials of the garbage station found earlier by the Thirteen Institutes, it can be confirmed that the "Muyang Road" provided by Han Fei during the interrogation was the original name of the original site of the Wuda Ximen garbage station.

The truth is close at hand, the old man with the tail of a rat, the death of his sister, behind the evil sect garbage station, what Ma Chao has studied, the truth of all things will probably only come out after catching Principal Bai and Yang Jianwen. Considering their special status in Wuda and their level of participation and understanding of the progress of the case, the arrest of Principal Bai and Yang Jianwen has reached the point where it cannot be delayed.

At this time, Mu Ruoyan lost the two of them, just like a sudden downpour, which instantly made everyone's hearts cold to the soles of their feet in a hurry to solve the case, and one of my hearts rose to my throat. Since the important person Li Qing has not been arrested, the thirteen institutes have closely monitored the whereabouts of Principal Bai and Yang Jianwen, and when it is the critical time to close the net, how could they disappear with them?

According to Mu Ruoyan, the police officers who carried out the stalking were loyal to their duties every day and never dared to be careless. Late this afternoon, Yang Jianwen and Principal Bai sneakily went to the lake behind the Wuda Administration Building, and they whispered to each other and walked around the lake many times. The few police officers who followed him were afraid of revealing their identities and did not dare to follow in circles, so they scattered around, or sat on a bench by the lake, or stood under the big trees by the lake to watch.

When they turned to the row of hundred-year-old trees by the lake, in the blink of an eye, the two of them disappeared out of thin air. The nearest police officer, who was only about 10 meters away from them, didn't see what was happening because of the trees blocking their view. None of the other police officers around saw the two leave or jump into the lake. It stands to reason that it is impossible to lose a person like this, unless they can use stealth or other special functions, is there really a ghost in this world?

In the foggy city at the beginning of the lights, the road is full of traffic and people, and two camouflaged police cars are speeding in it. They do not flicker their police lights and sirens like in TV and movies, but they are just carrying out their tasks in a low-key and steady manner, just like every plainclothes policeman who quietly serves the people, and silence is the best way to catch crimes.

The people sitting in the first police car were Lin Suo, me, Tie Ta Nan, Mu Ruoyan, Shi Fan and the ruffian man who came to pick up him in the club. The ruffian's name is Tang Ming, he was originally the captain of the Wudu Criminal Police Brigade, and he has very rich experience in undercover and criminal investigation, and has provided major clues to the progress of the case, and has now been promoted to the 13th Institute. In the latter car were police officers from the Wudu police, who had been responsible for tracking Principal Bai and Yang Jianwen.

At this moment, whether it is the first car or the second car, everyone is anxious and worried. Because on the way out, Lin received the latest investigation progress, that is, Ma Chao was in charge of the research content of the project, which was very important for the detection of the entire case.

In China's domestic waste treatment, there are three commonly used methods: landfill, incineration and composting. Landfill is the most traditional domestic waste treatment method, and it is also the most widely used domestic waste treatment method in China. Landfill does not need to invest too much money, but also can process a large amount of garbage, the harm is that leachate may have a potential environmental impact on groundwater, odorous gas diffusion, landfill gas flammable components are easy to cause landfill safety problems, so when landfilling, it is necessary to strictly control the design to avoid affecting the surrounding environment.

Incineration refers to a certain amount of excess air and solid waste in the incinerator oxidation reaction, after the garbage is treated by incineration method, the remaining residue is only 5% ~ 20% of the original garbage amount, in the process can also eliminate various pathogens, toxic and harmful substances into harmless substances, more suitable for domestic garbage with high fuel content. However, incineration is not a method of resource utilization, and its investment and operating costs are relatively high, and the gas (such as dioxin) and ash in the incineration process may cause secondary pollution.

Composting is the process of microbial decomposition of organic matter in solid waste, mainly through fermentation to make it into stable organic matter, and the use of high temperature generated by the fermentation process to kill harmful microorganisms to achieve the purpose of harmlessness; Solid waste contains a large amount of organic matter, and the conversion of organic matter into organic fertilizer for agricultural production through composting technology can not only improve soil performance and crop yield, but also eliminate the adverse effects of traditional chemical fertilizers on the soil. As far as landfills are concerned, China has strict restrictions on the garbage that can be entered into landfills, such as untreated catering waste, untreated manure, livestock manure, etc.

However, Ma Chao's research can break this restriction to a certain extent, and realize the "big pot stew" of garbage that could not be mixed with landfill before, thereby greatly saving the cost of garbage classification and landfill disposal, which is a breakthrough that has attracted worldwide attention.

However, his research was not completed when it was stolen, and the problem of harmless landfill leachate was not completely solved. The new type of leachate produced by the garbage treatment method researched by Ma Chao has extremely high requirements for the temperature and geological stability of the landfill site, and once the threshold is exceeded, this leachate is extremely easy to volatilize and leak, thereby polluting the surrounding air, groundwater and soil.

The "Muyang Road" outside the west gate of Wudu University is located on a small fault zone, and the underground geological structure is very unstable, which is extremely unsuitable for the construction of a new garbage disposal station. However, a large area of residential land outside the West Gate has been acquired by Jiang Qing's father's company, and they are very eager to use the new garbage station to create a high-tech first-class community, so as to promote the concept of "high-quality school district housing", and finally the price of this commercial housing is sky-high.

This is also one of the reasons why President Bai and Yang Jianwen must grab Ma Chao's research project. The construction of a new garbage station outside the west gate of Wuda is a profitable business in their eyes. Not only can you rely on the project to be rated as an outstanding young person, win a number of honors, but also become a vice principal, and make a lot of money, why not? As for the rest, it is very similar to a passage in Marx's "Capital".

"Capital is afraid of a situation where there is no profit or the profit is too small. As soon as there is a proper profit, capital will be very bold. As long as there is a 10% profit, it will be used everywhere. If you have 20%, it will be lively. There are 50% of them, which will cause positive risk-taking. 100 per cent, it will make people defy all laws. 300% will make people not afraid of sin, or even the danger of hanging. If unrest and strife bring profits, it encourages them. Smuggling and the slave trade are proof of this. ”

The new garbage station outside the west gate of Wuda confirms this passage, knowing that it is absolutely impossible, because of the existence of huge profits, Yang Jianwen and Principal Bai can ignore all laws, are not afraid of crimes, and are not even afraid of the danger of the death penalty, and try their best to persevere to the end. Based on the available evidence, the 13th Institute inferred that the garbage station would continue to kill people, and nine times out of ten it was the volatilization and leakage of new leachate.