Release of Nitrogen from Sediments in Different Types of Lakes

Abstract

This study simulated nitrogen release from different types of urban lakes, including South Lake and two sub-lakes of East Lake, Guozheng Lake and Miao Lake. The results showed that nitrogen release from the sediments of different polluted lakes under anaerobic conditions. It is necessary to maintain dissolved oxygen at a high level to suppress the nitrogen release. Under anaerobic conditions, higher temperatures can significantly improve the release of total nitrogen and ammonia in different types of lakes, but the promoting effect is different. The higher concentration gradient between sediments and overlying water, the greater release will happen. Ammonia has large contribution to the total nitrogen in all types of lakes. Reducing ammonia nitrogen is effective to control nitrogen release in the lake.