Optimization of total discharge permit limit of pollution sources in control units: a case study of Yongding River watershed
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摘要:
排污许可证制度是目前普遍采用的水环境管理的重要制度之一,在水污染控制和水环境质量改善中发挥着重要作用。通过将基于水环境容量约束和基于流域排放标准的允许排放量进行对比,构建了控制单元排污许可总量限值管理模式和污染源排污许可总量限值优化方法。基于永定河流域典型控制单元的实证研究表明,在执行流域排放标准时,北京段典型控制单元可满足水环境质量改善需求,但张家口段典型控制单元仍需要削减CODCr 210.388 t/a。张家口段典型控制单元内2家污水处理厂上游间接排放固定源需分别削减CODCr 0.002和32.039 t/a。
Abstract:Pollutant discharge permit system is widely used in water environment management, which has played an important role in water pollution control and water environment quality improvement. By comparing the allowable discharges based on the water environmental capacity constraints and the discharge standards for the watershed, the management mode of total discharge permit limit of control units and the optimization method of total discharge permit limit of polluting sources were constructed. The empirical study based on the typical control units of Yongding River watershed showed that the typical control unit of Beijing section could meet the needs of water environment quality improvement when implementing the watershed discharge standard, but the typical control unit of Zhangjiakou section still needed to reduce 210.388 t/a of CODCr. In the typical control unit of Zhangjiakou section, 0.002 and 32.039 t/a of CODCr should be reduced respectively in the two fixed sources whose wastewater was discharged into the sewage treatment plants.
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表 1 基于水环境容量约束的典型控制单元允许排放量
Table 1. Allowable discharge of typical control units based on water environmental capacity constraints
t/a 控制单元 CODCr 氨氮 总磷 C-016-001-01 1 684.02 84.20 16.84 C-011-002-04 1 082.00 202.30 13.40 表 2 永定河流域水污染物排放标准
Table 2. Discharge standard of water pollutants in Yongding River watershed
mg/L 污染物 CODCr 氨氮 总磷 重点控制区 30 1.5(2.5) 0.3 一般控制区 40 2.0(3.5) 0.4 注:括号内、外数值分别为水温≤12 ℃、>12 ℃时的值。 表 3 控制单元基于水环境容量约束和基于流域排放标准的允许排放量对比
Table 3. Comparison of the allowable discharges based on water environmental capacity constraints and watershed discharge standards in the control units
t/a 类别 控制单元C-016-001-01 控制单元C-011-002-04 CODCr 氨氮 总磷 CODCr 氨氮 总磷 基于水环境
容量约束1 684.02 84.20 16.84 1 082.0 202.3 13.4 基于流域
排放标准9.188 0.459 0.092 1 292.388 64.619 12.924 污染物
削减量0 0 0 210.388 0 0 表 4 控制单元固定源水污染物削减分配情况
Table 4. Reduction allocation of fixed source water pollutants in the control units
企业
编号行业类型 废水排放
去向Ai Bj AiBj CODCr削减
量/(t/a)企业1 炼铁 污水处理厂B 0.27 1.00 0.27 8.650 企业2 建筑工程用
机械制造污水处理厂B 0.14 1.00 0.14 4.485 企业3 热电联产 污水处理厂B 0.12 1.00 0.12 3.845 企业4 毛皮鞣
制加工污水处理厂B 0.12 0.76 0.09 2.917 企业5 污水处理厂B 0.12 0.24 0.03 0.928 企业6 陶瓷制品
制造污水处理厂B 0.18 0.72 0.13 4.148 企业7 污水处理厂B 0.18 0.28 0.05 1.619 企业8 水泥制造 污水处理厂B 0.17 1.00 0.17 5.447 企业9 污水处理厂A 0.002 -
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