biological denitrogenation的用法和样例：
例句
- Nitrification is an important step to affect nitrogen removal in biological treatment processes.
生物脱氮系统中，硝化作用好坏是影响脱氮工艺效率的重要步骤。 - Biological technology of denitrification and phosphorus removal has been focused on in wastewater treatment field in recent years.
生物脱氮除磷技术一直是污水处理领域所关注的重点。
