With DP, the control cost is lower than one with conventionalproportional rollback, Furthermore, the difference is larger in the co-ntrolc ost, the larger benefit will be obtained.

• 采用动态规划法,污染物的控制费用将比通常采用的比例削减法省,而且各污染源的控制费用差异越大,其经济效益越好。