his paper expounds tlie linear correlation of biochemical oxyen demand and chemical oxven demand for some certain wastewater,if the COD is kmown,then the BOD5 can be cacuhted.

• 阐述了某些特定废水中生化需氧量与化学需氧量两者之间具有线性相关关系，因此已知化学需氧量值就可推算出生化需氧量值。