请根据下面的结论写出论文中的一段：人类频繁的生产活动导致含氮废水排放到自然水体中造成水污染。生物法是处理含氮废水的常用方法其中异养硝化-好氧反硝化是一种新型微生物脱氮方法能高效去除氮和有机碳化合物。然而工业废水中常含有重金属这些重金属的存在会抑制微生物代谢能力严重影响氮的去除效率。

Human activities frequently lead to the discharge of nitrogen-containing wastewater into natural water bodies, causing water pollution. Biological methods are commonly used to treat nitrogen-containing wastewater, among which heterotrophic nitrification-aerobic denitrification is a new microbial nitrogen removal method that can efficiently remove nitrogen and organic carbon compounds. However, industrial wastewater often contains heavy metals, and the presence of these heavy metals can inhibit microbial metabolic activity and seriously affect nitrogen removal efficiency. Therefore, it is necessary to explore effective measures to reduce the impact of heavy metals on the microbial nitrogen removal process in order to achieve efficient treatment of nitrogen-containing wastewater.