1July, 1994, due to the sudden rainstorm, the upper reaches of the Huaihe River adopted flood discharge, and the 200 million cubic meters of water accumulated in the upper reaches were released in one winter and spring. Where the water passes, the river is turbid, the foam on the river surface is dense, and the fish and shrimp suddenly lose. Residents in some places downstream have symptoms such as nausea, diarrhea and vomiting after drinking the river water treated with tap water but not up to the drinking standard. After sampling inspection, it was confirmed that the water quality of the upstream water deteriorated, and the waterworks along the Yangtze River were forced to stop water for 54 days, and millions of people in Huaihe River were in a hurry to drink water. 10 years later, 60 billion RMB will be invested to control pollution. By 2004, the water quality of Huaihe River was restored to the level before 10. In the past two years, the water quality of the Huaihe River has further deteriorated. 60% of the whole water body of the Huaihe River has completely lost its water function, and even there are no mosquito nets in some river sections.
2.2004 Tuojiang "3.02" catastrophic water pollution accident.
The name of Sichuan Province comes from four rivers in its territory. Rich water resources have created Sichuan, a land of abundance. However, from February to March, 2004, Tuojiang River, one of the four major rivers, brought an unprecedented ecological disaster to the land of abundance. The name of Sichuan Province comes from four rivers in its territory. Rich water resources have created Sichuan, a land of abundance. However, from February to March, 2004, Tuojiang River, one of the four major rivers, brought an unprecedented ecological disaster to the land of abundance. At that time, due to a large amount of high-concentration industrial wastewater flowing into Tuojiang River, nearly one million people in five urban areas of Sichuan suddenly fell into the predicament of no water available, and the direct economic loss was as high as 2190,000 yuan. This incident was listed by the State Environmental Protection Administration as the biggest water pollution accident in China in recent years. Difficult. At that time, due to a large amount of high-concentration industrial wastewater flowing into Tuojiang River, nearly one million people in five urban areas of Sichuan suddenly fell into the predicament of no water available, and the direct economic loss was as high as 2190,000 yuan.
This incident was listed by the State Environmental Protection Administration as the biggest water pollution accident in China in recent years. The reason for this serious water pollution accident is that Sichuan Chemical Industry Co., Ltd. illegally put into trial production from February1/KLOC-0 to March 3, 2004, without reporting to the Provincial Environmental Protection Bureau for trial production approval during the technical transformation of its 1000 ton/day synthetic ammonia and ammonia processing plant. During the trial production, the process condensate containing a large amount of ammonia nitrogen (ammonia nitrogen content above 1000mg/l) was discharged from the factory and flowed into Tuojiang River. In addition, Sichuan Chemical Industry Co., Ltd. ignores environmental protection and safety in its daily production. From February to March of the same year, the environmental protection equipment in urea workshop, melamine workshop and melamine workshop did not operate normally, which led to the discharge of high-concentration ammonia nitrogen wastewater (ammonia nitrogen content greater than 1000mg/l). However, the national standard of ammonia nitrogen content in industrial wastewater of Chuanhua Company should be less than 60 mg/L, and the ammonia nitrogen content in the influent index of sewage treatment plant in the sewage entering area should be less than 75 mg/L. Therefore, the ammonia nitrogen index of the water discharged by Chuanhua Co., Ltd. seriously exceeds the national compulsory environmental protection standard, and it lasts for a long time, which leads to serious water pollution accidents in the main stream of Tuojiang River.
Third, Puyang, Henan Province has not been able to drink "safe water" for many years.
From June 5438+ 10, 2004, a water pollution incident occurred at the water intake of the Yellow River in Puyang City, Henan Province, which lasted more than four months. The drinking water safety of more than 400 thousand residents in the urban area is threatened, and Puyang city is forced to use the standby underground water source. It is understood that since 1997, the water intake of the Yellow River in Puyang City has been polluted for many years, and the urban drinking water source is affected by pollution for about 4-5 months every year.
Four cadmium pollution accidents in Beijiang River in 2005
Beijiang River is one of the three major tributaries of the Pearl River, and it is also an important drinking water source for Guangdong cities. In June 5438+February 65438+May 2005, serious cadmium pollution occurred in Shaoguan section of Beijiang River, and the cadmium concentration in Gao Qiao section exceeded 12 times. Shaoguan is located in the upper reaches of Beijiang River. Once pollution occurs, it will directly affect the drinking water safety of tens of millions of people in downstream cities. Through investigation, it was found that the cadmium pollution accident in Shaoguan section of Beijiang River was caused by excessive discharge of cadmium-containing wastewater by Shaoguan Smelter during equipment maintenance, which was a serious environmental pollution accident caused by illegal and excessive discharge by enterprises.
Pollution Status of Qihe River in Chongqing in 2005
Because the water intake point was polluted, the waterworks stopped supplying water. Nearly 30,000 residents in He Qiao District, Gu 'nan Street, Qijiang, Chongqing, had no running water for two consecutive days from 65438+2005 10/3, and Qijiang Gear Factory stopped production. After investigation by the health and environmental protection departments, the river was polluted by the wastewater discharged by Chongqing Huaqiang Chemical Fertilizer Co., Ltd., and the relevant departments of Qijiang County immediately opened floodgates in the upper and lower reaches of He Qiao to speed up the dilution of polluted water, and instructed the sulfuric acid plant of Huaqiang Chemical Fertilizer Co., Ltd. to stop production and rectify.
Six major water pollution incidents in Songhua River in 2005
On June/2005165438+1October 13, an explosion occurred in the aniline workshop of Shuangbenzene Plant of China Petroleum Jilin Petrochemical Company. About 100 tons of organic pollutants such as benzene, aniline and nitrobenzene produced by the accident flowed into Songhua River. Benzene pollutants are harmful to human health, leading to major water pollution incidents in Songhua River. The Harbin Municipal Government immediately decided to close the water intake of the Songhua River in Harbin 165438 from 0: 00 on October 23rd, and stop supplying water to the urban area. All supermarkets in Harbin snapped up drinking water without exception.
Seven 2006 Baiyangdian dead fish incident
In February and March of 2006, a large-scale fish death occurred in Baiyangdian, the largest freshwater lake in North China, which is known as the "Pearl of North China". The investigation results show that serious water pollution and low dissolved oxygen in water are the main reasons for fish suffocation. This incident caused 96,000 mu of water in Renqiu City to be completely polluted, and the water was black and smelly. All the fish cultured in cages died, a large number of dead wild fish floated in the lake, and some aquatic plants died black.
Eight arsenic pollution incidents in Yueyang, Hunan Province in 2006
On September 8, 2006, a water pollution incident occurred in Xinqiang River, a drinking water source in Yueyang County, Hunan Province. Arsenic exceeds the standard by about 10 times, and the drinking water safety of 80 thousand residents is threatened and affected. Finally, after verification, it was found that the pollution was caused by the daily discharge of industrial sewage from three chemical plants in the upper reaches of the river, which led to a large number of high-concentration arsenic-containing wastewater flowing into Xinqiang River.
Water pollution incident in Taihu Lake in September 2007
Since May 29, 2007, the tap water quality of a large number of citizens' homes in Wuxi, Jiangsu Province has suddenly changed, accompanied by an unpleasant smell, which makes it impossible to drink normally. The drinking water source of Wuxi citizens comes from Taihu Lake. The reasons for this sudden change in water quality are as follows: since the summer, the water level in Taihu Lake in Wuxi City has been the lowest in 50 years, coupled with the continuous high temperature and lack of rain, Taihu Lake is seriously eutrophic, which leads to the early outbreak of cyanobacteria in Taihu Lake and affects the water quality of tap water sources. Wuxi citizens have rushed to buy pure water in supermarkets, and the price of bottled pure water in street retail has also fluctuated greatly.
Water Pollution in Shuyang County, Jiangsu Province in 2007
At 3 pm on July 2, 2007, the monitoring of the surface water plant in Shuyang County, Jiangsu Province found that the water intake of the water plant located in Huaishuhe River was invaded by a large amount of sewage for a short time, and the urban domestic water supply source was seriously polluted, and the water flow showed obvious odor. After water quality testing, the ammonia nitrogen content in the water at the water intake is about 28 mg per liter, far exceeding the national water quality standard for water intake. Because the treated water quality can not meet the drinking water standard, the urban water supply system was forced to close, and the draft and water use of 200 thousand people in the urban area were affected to varying degrees. Until the morning of July 4, the water intake of the waterworks closed due to drinking water pollution was reopened, the normal water supply in Shuyang City was fully restored, and the water supply in Shuyang County was stopped for more than 40 hours.
The increasingly serious water pollution poses a great threat to the survival and safety of human beings and becomes the main obstacle to the sustainable development of human health, economy and society. According to the survey of international authoritative organizations, in developing countries, 80% of various diseases are spread by drinking unsanitary water, which causes at least 20 million deaths worldwide every year. Therefore, water pollution is called "the world's number one killer".