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《Acta Ecologica Sinica》 1981-03
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THE MAX1MUN AMOUNT OF HEAVY METALS APPLICATED TO SOIL IN ZHANGSH1 WASTEWATER IRRIGATION AREA

Wu Yanyu Chang Xiushun Chen Tafo Kong Qingxin(Department of Pollution Ecology. Institute of Forestry and Pedotog y, Chinete Academy of Sciences. Shenyang.)  
Zhangshi wastewater irrigation area is located in the western suburb of Shenyang, Liaoning province. It has utilized untreated wastewater as a source of water and fertilizer for 10-20 years. Because Shenyang Smelter has not built any equipments to treat wastewater before, the quality of inflow raw sewage exceeded the water quality standard of farm irrigated (China). Zhangshi irrigation area has been contaminated with heavy metals seriously. Cadmium and arsenic have been accumulated in the soil and rice. As a consequence of this fact, Cd content in urine and hair of human were apparently higher ther than control area. Positive reaction rate of lower molecular protein in urine increased. The conclusion from these facts is that in irrigated area Cd damaged human health already.Since 1975-1980 by way of sampling statistics and pot tests with single and complex factors, we established soil environmental guidelines of heavy metals (comprize the level of obstacle in rice grow and the level of arise rice residue toxicant). From these guidelines, we can calculate the maximum amounts of heavy metals applicated to soils in irrigated area to protect plants against toxicity. At same time, we had set up experimental balance farm of irrigation wastewater, calculated input and output of heavy metals, discovered the model of pollutant accumulated in irrigated area and the minimum input for control contamination.Now we start to resolve many problems urgently in this area, which are, control of the pollution source, wastewater utilization with avoidance of pollution and reclamation of contaminated soil. In upper reaches of irrigated area, we ought to irrigate fresh water, to exchage the top soil and to apply soil improver. In lower reaches, if irrigate with sewage continiously, we have to control not only the concentration, but also the input of pollutant.
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