After the biological contact oxidation process, the average COD value decreases to less 100mg/L, thus the outcome water reaches the standard stipulated in the national regulation GB8978-2000.

• 该段能够将前步处理的废水COD由243mg/L左右完全降低到100mg/L以下，使出水达到GB8978-2000国家综合污水一级排放标准。