According to the Comprehensive Management Plan of Wuliangsuhai compiled by china environmental science Research Institute and other units entrusted by Bayannaoer Municipal Government, "In recent years, the process of industrialization and urbanization in Bayannaoer City has been accelerated, which has brought a lot of industrial wastewater, urban domestic sewage and agricultural backwater, resulting in the deterioration of regional ecological environment, and the trend of eutrophication and swamp is serious."
Take the figures of 2008 as an example. In that year, the industrial wastewater discharge in this region was 2.3310.2 million tons, the urban domestic sewage discharge was 225.64 million tons, the farmland drainage was 267 million tons, and the aquaculture wastewater discharge was 26.7110,000 tons. The pollution source with the highest discharge of COD (chemical oxygen demand) in the region is industrial wastewater, accounting for 34.5% of the total discharge. The pollution source with the highest ammonia nitrogen emission is urban domestic sewage, accounting for 57.4% of the total emission, followed by industrial wastewater and livestock wastewater.
The regional pollutant discharge has far exceeded the water environmental carrying capacity of Wuliangsuhai. According to the local environmental protection department, the pollution load into the lake in 2008 was 2292.65 tons of total nitrogen and 247.36 tons of total phosphorus, while the water environmental carrying capacity of Wuliangsuhai was only 722.3 tons of total nitrogen and 40.9 tons of total phosphorus.
Another set of data released by Bayannaoer Hetao Water Group is more intuitive: the amount of water entering Wuliangsuhai every year is about 350 million to 400 million cubic meters, including 200 million cubic meters of domestic sewage and industrial wastewater, while the total storage capacity of Wuliangsuhai is only 320 million cubic meters.
According to the monitoring data of Bayannaoer Environmental Monitoring Station on October 20, 2005-20 10/0, the environmental pollution and ecological function degradation in Wuliangsuhai Lake are severe, and the rate of ammonia nitrogen exceeding the standard is 30.3%. The sediment pollution is serious, with total nitrogen, total phosphorus and heavy metals exceeding the standard, and the sediment pollution in Xidatan and Dongdatan is the most serious; The species and quantity of fish have been greatly reduced, and the function of freshwater fishery base has gradually lost.
Yellow river water pollution incident
On June 25th, 2004, because the water level in Inner Mongolia Hetao Irrigation District exceeded the warning line, the General Drainage Authority wanted to lift water, and concentrated about 6,543,800 cubic meters of papermaking sewage accumulated in the lower reaches of Wuliangsuhai into the Yellow River, which instantly caused the "June 26th" Yellow River water pollution incident. Two days later, on June 28th 10, the downstream Baotou Water Supply Company closed the water intake of the Yellow River Water Source General Factory. It was not until July 3, 2004 19: 45 that Baotou Yellow River Water Source General Factory resumed water intake, resulting in direct economic losses of more than 2.8 million yuan.
The Environmental Protection Department of Inner Mongolia Autonomous Region found out afterwards that the water pollution incident caused serious pollution 14 days in the 400 km reach of the Yellow River, and the water body completely lost its use function. The five-day water cut caused economic losses of about 65.438+0.3 billion yuan in Baotou, and the impact on the life and work of more than 2 million Baotou citizens was incalculable. This is also the biggest pollution accident of the Yellow River since the founding of the People's Republic of China, and 80% of the wild fish in the Yellow River waters near the pollution source died.
In fact, Wuliangsuhai has become the largest pollutant storage pool in western Inner Mongolia. What is even more worrying is that the sewage here is still continuously discharged into the Yellow River through rivers. If the pollution situation in Wuliangsuhai Lake is not changed, the "6 26" Yellow River water pollution incident may break out again.