The article describes the circulate and expend of nitrogen in water, analyse the reasons of ammonia nitrogen rising in slaughter wastewater treatment by SBR method and gives some improved measures.

• 摘要通过对水中氮的内循环及氮支出的叙述，分析了屠宰废水经SBR法处理后氨氮升高的原因，并捉出了改进措施。