Colleagues from the Occupational Hygiene Division first set up a cordon around the sewage pumping station to isolate the crowd of onlookers.

The summer wind blows through the sewage pumping station with a sultry moisture, and the people around can clearly smell the stench of the wind, such as rotten eggs mixed with some sour smell.

Gu Yanan exchanged views with colleagues from the occupational health department, "Now that the weather is hot, there will be biogas in the sewage pipeline, and the toxic and harmful gases in the biogas are mainly hydrogen sulfide and carbon monoxide. ”

Xiao Zhang, a colleague from the Occupational Health Department, had already carried the detector in his hand, "Director Gu, don't worry, our Occupational Health Department has experience in this kind of thing, and what we brought on the scene is a rapid detector for hydrogen sulfide, as well as a more refined absorption liquid sampling method, and various methods are prepared, so we must find out the cause of this accident." ”

Gu Yanan watched as his colleagues in the occupational hygiene department put on protective masks and approached the sewage pumping station with a detector.

After a series of on-site tests, someone used a long bamboo pole to stir the sewage under the well, and then measured it again, and the test results came out quickly.

Xiao Zhang reported to Gu Yanan, "Director Gu, the concentration of hydrogen sulfide gas in the underground was 6.07 milligrams per cubic meter at the beginning, and the concentration of hydrogen sulfide gas on the liquid surface after stirring was 24.29 milligrams per cubic meter, which has seriously exceeded the confined space operation standard stipulated by the state. ”

"Seal off the scene, prohibit crowds from approaching, and notify the relevant departments to bring protective tools to clean up."

After dealing with the scene, Gu Yanan and Gu Qingcen drove back to the emergency office of the CDC.

——

Lianhai First People's Hospital, emergency room.

Five staff members who were injured in the work at the sewage pumping station were taken to the emergency room one after another.

Three of the unconscious workers who were drowning in sewage were pronounced dead by doctors.

The unconscious worker in Inoue was taken to the emergency room.

At that time, the worker who ran to the side of the road for help had mild symptoms and treated him symptomatically.

The emergency room had just finished treating the staff at the sewage pumping station when two more people with similar symptoms were transferred to the hospital.

The patient is from Yuntai Village, deep in the Yuntai Mountains, and is two women, one is slightly older and the other is about 30 years old.

Both had flushed faces, purple nails, and projectile vomiting.

The emergency doctor thought that the symptoms of the two people who were transferred to the hospital were very similar to those who had just been brought in from the sewage pumping station, and suspected that they were also poisoned by methane gas.

While treating the patient, the emergency doctor reported the incident as a mass poisoning incident on the epidemic website.

——

Lianhai Center for Disease Control and Prevention, Emergency Office.

Gu Yanan signed Gu Qingcen with the access to the P3 laboratory.

Gu Qingcen took the report sheet signed by Gu Yanan and went to the P3 Laboratory Management Office to change the permissions.

In the emergency office, Gu Qingcen left, Zhou Lao and Gao Fei went to the county CDC to guide the local rat density monitoring, and only Gu Yanan, Lu Li and Wang Xiaoxiao were left in the office.

Since Gu Yanan and Gu Qingcen entered the office in the morning, Wang Xiaoxiao smelled a peculiar smell, and now that Gu Qingcen left, Wang Xiaoxiao sniffed and sniffed everywhere, and finally stopped beside Gu Yanan.

"Sister Yanan, why do you have a strange smell on you? It felt like it had just come up from the sewer. ”

Gu Yanan sniffed his clothes, and sure enough, there was a smell, which was the smell left from the rescue of people at the sewage pumping station just now.

"Oh, it's the smell of sewers, I passed by the sewage pumping station when I went to work today, someone was poisoned by methane, and I participated in the rescue."

"No wonder you and Gu Dashen are late, it turns out that you are saving people on the road, and someone is poisoned by methane?"

"Well, on the way to work, I met a worker working at a sewage pumping station who was unconscious due to inhaling the biogas in the sewer pipe, and the main reason for this poisoning was that the content of hydrogen sulfide gas in the biogas was too high, because the patient's symptoms were more like hydrogen sulfide poisoning than pure suffocation, which was mixed gas poisoning."

Lu Li heard the conversation between the two and interjected, "Hydrogen sulfide poisoning occurred in the paper mill in Boshan County before, but it was pure hydrogen sulfide poisoning, which is not the same as the usual biogas poisoning. ”

Wang Xiaoxiao: "Yes, mixed poisoning caused by biogas is more common, before we Lianhai City vigorously promoted biogas digester technology in the nearby suburbs, many farmers because of cleaning their own biogas digester caused by poisoning, but in recent years, after publicity and education, this kind of thing has happened very little, before I and Sister Yanan also participated in dealing with a poisoning incident caused by farmers cleaning their own biogas digesters, and I remember it deeply." ”

Lu Li and Wang Xiaoxiao laughed at you and me, discussing the matter of biogas poisoning, Gu Yanan also felt that the smell on his body in the sewage pumping station was too unpleasant, fortunately, there was a shower in the laboratory building next door, and his office also had a change of clothes, so he just went to the laboratory building to take a shower, change his clothes and then go back to the office.

Ten minutes later, Gu Yanan took a shower and changed into clean clothes, returned to the emergency office, and when he pushed open the door, he heard Lu Li's anxious report, "Sister Yanan, there is a new epidemic report on the epidemic network, and the People's Hospital has reported a suspected case of biogas poisoning." ”

"Was it the sewage pumping station biogas poisoning incident that happened on South Main Street this morning?"

"No, in addition to the methane poisoning incident in the morning, there is another case, which is two female patients, whose home address is Yuntai Village, Yuntai Township."

"Villagers living in the Yuntai Mountains?" Gu Yanan asked in surprise.

"Yes, it has nothing to do with the methane poisoning incident at the sewage pumping station on South Street in the morning, two patients are now being treated in the People's Hospital, Sister Yanan, are we going to go to the hospital?"

"Now that the weather is getting hotter and hotter, and the biogas poisoning incident has reached the season of frequent occurrences, let's go to the hospital to see the patient first, Lu Li will go to the hospital with me, Xiaoxiao will stay in the office, and when Gu Qingcen comes back, you will sort out the electronic version of the cold storage of the P3 laboratory with him."

——

Lianhai First People's Hospital, Department of Neurology.

Two patients sent from Yuntai Village were placed in the neurology ward.

In addition to the neurology doctor, there were several police officers in the ward.

There are several familiar figures among the police, one of which is Xiao Li, a policeman who Gu Yanan knows and often is by Nan Hanfei's side.

Gu Yanan and Lu Li stood outside the door of the ward, listening to the policeman Xiao Li interrogate the two patients on the hospital bed.

Police officer Xiao Li asked Grandma Li, "What time did you leave home in the morning?" ”

"At about 10 o'clock, I went to the mountains to herd sheep, and the two children stayed at home to play, and before I left, Dashan told me that he would take his younger brother to the neighbor's house next door to play later."

"What time are you home?"

"At about 2 p.m., as soon as I got home, I looked for the children, and when I found that the children were not at home, I went to the neighbor's house to ask, and the neighbor next door said that my two grandsons played under his walnut tree in the morning, left at noon, and have not seen him since.

I asked all the neighbors, and they all said that they had never seen my two grandchildren, and then the mother and father came back from the town, and the mother saw the footprints of the children outside the cowshed, and when they entered the cowshed, they found the two children lying in the cowshed, and they were out of breath, and the children were all wound......ed."