| Problems discussed in this paper are very common in the economically developed Tai Lake region. Watershed pollution by township enterprises, pesticides and chemical fertilizers has been deeply concerned. The main sources of industrial pollutants in this region are textile printing and dying, papermaking, electroplating, chemical and food industries. Some heavy metals, such as Cu, Zn, Pb. Cd have been detected in some of the rivers. However, organic pollutants are more widespread than heavy metals with BHG (benzene hexachloride) having been detected in all water samples with concentrations ranging from 0.602 to 2.236.ppb.By end of this century, 11 me industrial output will increase four times as much as at present, and the waste discharge from township enterprises is expected to decrease 15% per 10,000 yuan output value, then the total waste discharge is estimated still to be 1.5 times as much as today. By then, total wastewater discharged from township enterprises will be 9.2 times more than that of 1984, and water quality in some polluted water bodies will be worse seriously. The authors urge to take the following effective measures for preventing environmental pollution in this region:(1) introducing treatment techniques that are currently in use;(2) making full use of self-purification of the water bodies:(3) controlling acid wastewater from ore wastes polluting water bodies (rivers, lakes ponds);(4) enforcing protection of water resources from rivers;(5) rationally arranging township enterprises and adjusting structure of trades;(6) controlling pollution of canal sediment. |
