At about 16:30 on July 22, the Great Wall Biochemical Engineering Co., Ltd. of Huailai County, Zhangjiakou City, Hebei Province, had a poisoning accident caused by harmful gases while organizing the cleaning of the sewage sedimentation tank in the factory area.
At present, the accident caused 5 deaths and 4 injuries. The injured have been rushed to hospital for treatment, and their vital signs are stable.

On July 23, the media learned from the company concerned that the company has stopped production and is investigating the cause of the accident.
According to Tian Eye Check, Huailai Great Wall Biochemical Engineering Co., Ltd. was established in June 1998, with registered capital of 1.4 million yuan and paid-in capital of 1.4 million yuan. The legal representative is Zhou Tiecheng. The company's business scope includes the production and sale of food additives, pharmaceutical intermediates, bioengineering products and the import business of the above products.
Be vigilant! Limited Space Accidents in Summer
In summer, when the weather is hot and humid, toxic and harmful gases are more likely to accumulate. In addition to the hot weather, some operators lack safety awareness and take off protective masks without authorization, which is very dangerous.
After the poisoning suffocation accident, some guardians and rescuers even ventured into limited space to rescue without taking any effective protective measures.
Through summarizing 47 typical wastewater treatment plant accidents in the past 10 years, some scholars found that May to September is the high incidence period of wastewater treatment accidents every year. Therefore, in this period, every sewage treatment personnel must be particularly vigilant.


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The accidents from May to September accounted for 68.1% of the total accidents, 66.7% of the total deaths and 79.3% of the total injuries. Although limited space accidents occur frequently, they can be prevented and avoided. The key is to master the safety knowledge of limited space operations.