Northwest Regional Water Quality Assessment Water Pollution Control Measures - Water pollution, Pollution Control Northwest - water industries
1, water Environment Assessment of pollution Northwest area into the Yellow River Basin Water Environment and Inland River Basin, comprehensive monitoring of water quality data is not perfect on the water quality evaluation by the usual method of a particular control section. Distribution according to Northwest River, the main town sewage and water environmental function zoning, location, choose a 149 water quality monitoring sections, on behalf of Northwest water quality assessment of water quality. Chosen in northwest inland water quality monitoring sections 81, located in the Junggar flow area, flow area of Tarim, Central Asia within the flow, the Irtysh River basin, river basin, river basin, Shule River Basin . Northwest of the Yellow River Basin water quality monitoring of 68 selected sections, focusing on distribution of the Yellow River and Weihe River. Other sections of the rivers is the distribution of Huangshui large Xiahe, Yan River, the Tao, no set River, fresh water river.
1. Inland River Basin Water Environment in the water quality of inland river basins in the Northwest is still good, according to section 2000 of 81 water quality monitoring data, up to the national surface water environmental quality standard Class 64.5%, reaching class standard of 14.8%, to and inferior to the class V accounted for 19.7%.
2. The Yellow River Basin Water Environment in the Yellow River Basin in the northwest, Water Pollution Serious, for the full picture of water pollution in the Yellow River in Northwest, sub-2000 Feng, flat, dry three water of the Yellow River's water quality monitoring sections for evaluation, the results show that, first, the Yellow River water pollution have been very serious. Northwest section of Yellow River water quality in the 25, 2000 Feng, flat, dry up the three water type of the cross-section rates were 33%, 61% and 20%, to and inferior to the proportion of class V was 39%, 39 % and 60%. Second, the Weihe River has basically lost the most fundamental ecological functions of rivers. In the Weihe River in 2000 with the monitoring data of 19 water quality section, only one section to class, other sections are the V class or inferior , potassium permanganate index reached a mean of 27.74mg / L, dissolved oxygen index has six sections less than 3mg / L, generally seriously polluted river near the city, part of the urban river has become a sewage ditch.
Second, the causes of pollution 1. Northwest Territories pollution load greatly exceeds the national average from the 2000 national emissions the major river basins and river basin water resources for many years the average contrast (see Table 1) can be seen that the pollution load of the Yellow River in Northwest greatly than the national average, is the national average of 2.75 times the volume of sewage water pollution in the Yellow River in Northwest China is the main reason.
2. Life Sewage Processing low northwest weak economic foundation, slow urban infrastructure, urban drainage and wastewater treatment facilities construction lagged far behind urban development, urban wastewater treatment rate of less than 10%, far below the national average.
3. Industrial wastewater volume statistics based on the 2000 environment, the Northwest region for more than a total of 100m3 on the drainage of industrial enterprises 4044, the annual water consumption is 18.359 billion m3, the amount of fresh water was 2.13 billion t, mercury emissions 0.6t, cadmium emissions 16t, hexavalent chromium emissions 7.3t, lead emissions 65t, arsenic emissions 93.3t, phenol emissions 417.0t, cyanide emissions 49.8t, COD emissions to 330 000 t, Oil Class emissions 06 000 t. key industrial enterprises in the Yellow River in Northwest wastewater emissions and emissions of major pollutants are much higher than the River of Northwest.
4. Agricultural nonpoint source pollution in most provinces in the northwest region, the regional development of agriculture remains the main industry. As can be seen from the front of ammonia in the northwest, the major pollution of water environment is one factor. Ammonia pollution not only from industrial wastewater and sewage, agricultural sources can not be overlooked.
Northwest soil structure, application methods, irrigation methods are similar, agricultural pollution on the waters of the impact of these pollutants were great, in the northwest, the main reason for nitrogen pollution.
Three pollution control district in Northwest
1. Seriously polluted Yellow River, Weihe River, River basin, Shule River Basin in 21 cities (regions) of the major rivers, has been seriously polluted and can not meet the standards of agricultural irrigation water Some have become black-odor River, water quality has class or worse than class . Serious pollution of the river area of the Northwest region, with only 13.0% of the total area, but these areas are concentrated mining towns, densely populated region, is also a major area for future urban development, the current has reached the affected population in Northwest to 55.2% of total population .
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