On July 22, around 4:00 p.m., Niujin Shui was planting trees near the Sewage Sedimentation Pool of Great Wall Biochemical Engineering Co., Ltd. in Huailai County, Hebei Province. He and several colleagues took ropes and sticks to prepare for rescue. When I went in, I saw a man lying on the ground. There were people in the pool at that time, and then I fainted. I dont remember anything.
On July 24, a reporter from the Beijing News reported that five surviving employees and six firefighters were being treated in Huailai County Hospital and the Inpatient Department of Zhangjiakou First Hospital. According to a circular issued by the Propaganda Department of Huailai County Party Committee, five people were killed when employees of the company were poisoned by harmful gases while cleaning up the sewage sedimentation tank in the factory area. In addition, the vital signs of the 11 inpatients were stable, of which 6 firefighters had been discharged.
The doctors of Huailai County Hospital of Traditional Chinese Medicine and Zhangjiakou First Hospital who participated in the first aid and the staff of enterprises involved inferred that harmful gases might be biogas produced by long-term waste water and waste fermentation. Beijing News reporters in the hospital where the injured learned that they are currently in accordance with the treatment of biogas poisoning.
In response to the above inferences, Huailai County Committee Propaganda Department staff said that experts on the spot air, sewage and solid waste sampling test results have not yet come out.
A professionals surnamed Chen who is engaged in sewage sedimentation tank cleaning told Beijing News that if 100 square meters of sewage sedimentation tank need to be cleaned up, water and air will be tested before and during the whole process of cleaning. Operators should also wear chemical suits and gas masks to prevent carbon monoxide and hydrogen sulfide. Poison and explosion.
New Beijing News reporters learned that the company involved in the incident did not wear gas masks, sewage sedimentation tank is located indoors, ventilation is not smooth.
Five workers died of poisoning in the sewage sedimentation tank of the enterprise concerned. New Beijing News reporter Wang Fei
No one thought it was poisoning by harmful gases.
On the night of July 23, Niu Jinshui was lying in the hospital bed of Zhangjiakou First Hospital with oxygen tube in his nostril and some dizziness.
He recalled that on the afternoon of July 22, he was planting trees with his colleagues in a green area beside the sewage treatment pond. He heard someone shouting, No, someone dropped into the sewage pond. So I ran to the rescue with a colleague.
Considering the depth of the pool, Niu Jinshui found a rope and a stick and went into the shed where the pool was located to rescue him. Just went in, he was dizzy and fainted directly... When I opened my eyes, I was carried to the open space outside the factory shed and waited for 120 to pick it up.
He Fengguo, 47, has just entered the relevant enterprises for about two months. At the time of the accident, he was working in a workshop about 30 meters away from the sedimentation tank, where he mainly produces tartaric acid for wine.
He Fengguo said that when the accident happened, his leader called him to go to the sewage sedimentation tank to save people: At that time, someone fell into the pond, and nobody expected that the people inside were poisoned by harmful gases.
He Fengguo told the Beijing News that he entered the factory shed where the sewage sedimentation tank was located. When he saw a worker lying motionless on the ground, he quickly dragged the worker outside the factory shed. At that time, his head began to faint: He also fainted when he went in to save people. After I dragged him out, he began artificial respiration and rescue.
At present, He Fengguo and his rescued workmates are receiving treatment in the First Hospital of Zhangjiakou. They live in the same ward, and their vital signs are stable.
Mud from the Sewage Sedimentation Tank was being cleaned up at the time of the accident.
Employees of the enterprises involved in the poisoning accident ranged from 40 to 60 years old, with the longest working period of 12 years and just two months. They all said that the company had never had a similar accident and would not be exposed to toxic and harmful gases in the production process.
The company mainly produces tartaric acid-related chemicals, including potassium tartrate and sodium tartrate, in addition to tartaric acid used in wine, beverages and other food acidifiers, which are mainly used in pharmaceutical and construction industries, according to the official website of the company. At present, the company has also developed malic acid and its derivatives, mainly for food processing.
Wang Shujun, the injured, said that he had worked for 12 years in the enterprises concerned, and that the sewage sedimentation tank of the enterprises was cleaned twice a year. Before that, the sewage sedimentation tank was open-air. Two or three years ago, the environmental protection department asked him to add a factory shed to the sewage treatment tank.
He said several workers were using slurry pumps to pump sewage and sludge from the sewage sedimentation tank into another nearby pond at the time of the accident, because after the sewage was drained, there was still a accumulation of sludge (waste) in the pond, and the workers went down to the pond to inject water and mix sludge so that it could be pumped away by the slurry pump.
He said several of the workers who were killed were poisoned by harmful gases while mixing mud with water.
Doctors and factory staff involved in the treatment of the wounded speculated that harmful gases might be produced by fermentation of long-term discharged wastewater and wastes, resulting in workers and firefighters involved in rescue poisoning. Beijing News reporters in the hospital where the injured learned that they are currently in accordance with the treatment of biogas poisoning.
In response, a staff member of the Propaganda Department of Huailai County Party Committee said that after the accident, experts had entered the factory sewage sedimentation tank to do sewage, solid waste and surrounding gas sampling, and the results of the sampling have not yet come out. He could not conclude the inferences of doctors and workers involved in enterprises.
The black sewage in the sewage sedimentation tank emits a pungent odor, which can be smelled within 10 meters nearby. New Beijing News reporter Wang Fei
The foul smell was emitted near the sewage sedimentation tank.
The sewage sedimentation tank is surrounded by a woodland where seedlings are being raised. On the afternoon of July 24, a reporter from Beijing News visited the surrounding of the sewage sedimentation tank, noting that there was a warning line around the sewage sedimentation tank, but a large pungent odor could still be smelled in the range of 5 to 10 meters outside the warning line.
New Beijing News reporter close observation, sewage treatment pond in a factory shed, the factory shed surrounded by iron shield, closed more tightly, only three narrow windows can ventilate, its ventilation and ventilation is not smooth.
The sewage sedimentation tank in the factory shed is divided into three areas. Each area is an independent sewage sedimentation tank. The sewage in the pond is black and the pungent odor makes people feel like vomiting.
In addition, Beijing News reporter through Tian Eye Cheng learned that Zhou Tiecheng, the legal representative of Great Wall Biochemical Engineering Co., Ltd., actually held 90.88% of the shares. He served as a senior executive in eight companies, covering grape cultivation, tartaric acid production, technological development of food chemicals, wine manufacturing and product sales, forming a complete industrial chain.
Among them, he holds 81% in Huailai Cabernet Wine Co., Ltd., mainly engaged in the production and sale of fermented fruit and vegetable juice, wine, pre-packaged food sales such as bulk refrigerated food, and import and export business of self-owned products. The company has the same address as Huailai Great Wall Biochemical Engineering Co., Ltd.
Six poisoning firefighters were discharged from hospital
On the morning of July 24, a reporter from the Beijing News met five poisoning employees from enterprises involved in the treatment of poisoning in the First Hospital of Zhangjiakou. They entered the hyperbaric oxygen room of the hospital for treatment one after another.
One of the poisoned employees said that this was the third day of their admission, and now they need two hours of hyperbaric oxygen room treatment every day.
The reporter of Beijing News noticed that some poisoned employees in the enterprises involved still need to take wheelchairs on their way to the hyperbaric oxygen chamber. An employee without a wheelchair trembled and trembled on his way.
On the afternoon of July 24, Xinjing News reporter learned from the Propaganda Department of Huailai County Party Committee that after the accident, local rescue was launched, and an accident investigation team was set up to organize experts to investigate the cause of the accident.
In addition, six firefighters who participated in the rescue hospitalization were checked and all the indicators were normal. They were discharged at 9:30 on July 24.
At present, the factories concerned are still in a state of shutdown, and the cause of the accident is still under investigation.
July 23, New Beijing News reporter aerial photography involved enterprises. Near is the place where the accident happened, and far away is the production workshop. New Beijing News reporter Wang Fei
Head of professional cleaning company: Sewage sedimentation tank is easy to produce hydrogen sulfide
On the evening of July 24, a reporter from Beijing New Beijing News learned from a sanitation service company whose main business is to clean up sedimentation tanks and sewage pools that because it concerns the safety of workers and the safety of the company, it is necessary to have instruments to detect whether sewage and air are harmful when cleaning up.
The person in charge of the environmental sanitation service company Chen said that no matter what the sediments in the sewage sedimentation tank are, they accumulate in the pond and become silt, and generally produce carbon monoxide and hydrogen sulfide. Hydrogen sulfide is a kind of substance contained in biogas: improper cleaning, construction personnel lost their lives, and even worse, when the gas meets the fire will be invented. Theres an explosion.
Mr. Chen said that the size of the incident sewage sedimentation tank is about 10 * 10 meters. Generally, it needs to be cleaned up for three days and the price is about 40,000: Look at the price, we need to check the sewage and the surrounding air of the sewage sedimentation tank before cleaning to see if it is harmful. We also need real-time monitoring in the cleaning process. Operators need it. Wear gas mask to ensure the safety of operation.
In addition, Mr. Chen said that in order to save costs, it is common for some enterprises to let employees clean up the sewage sedimentation tank. The employees suffer from slight poisoning, dizziness, vomiting and death.
In addition, the head of another clean-up company in Beijing also said that many of the incidents in the clean-up of sewage sedimentation tanks were caused by carbon monoxide and hydrogen sulfide. Hydrogen sulfide has no color, it will have a smell of rotten eggs, explosion in open fire, and can dissolve in water: If the sewage sedimentation tank is indoor, we detect harmful gases or liquids, solids, we will first ventilate, and then dilute the sludge and sewage with a high-pressure water gun.
Source: New Beijing Daily Responsible Editor: Li Wan_B11284