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工厂排出的废水水质除要符合工业废水最高容许排放浓度的规定外,尚需根据接纳废水的水体情况,通过一系列计算来确定废水的处理程度及对水体的影响。对于第三类水体(非饮用水源和非渔业水体)一直是按溶解氧的最低极限值,来确定污水的处理程度和核算污水排入后水体溶解氧的状况的。这种同时考虑耗氧和复氧的溶解氧含量计算公式,已在各种文献、书籍中广为引用。我们在某厂的设计中发现该计算公式在理论上有不完善之处,因而导致计算出的污水BOD_5。允许浓度偏高,即需要处理的程度偏
In addition to complying with the maximum allowable emission concentration of industrial wastewater, the wastewater discharged from the factory shall be determined by a series of calculations to determine the degree of wastewater treatment and the impact on the water body according to the conditions of the water body receiving the wastewater. For Type III water bodies (non-potable water sources and non-fishery water bodies), the minimum limit value of dissolved oxygen has been used to determine the degree of sewage treatment and to account for the state of dissolved oxygen in the water after the sewage is discharged. This formula for calculating the dissolved oxygen content considering both oxygen consumption and reoxygenation has been widely cited in various literatures and books. We found in the design of a plant that the formula was imperfect in theory, which led to the calculated wastewater BOD_5. Permissible high concentrations, that is, the degree of processing required