人工湿地反硝化外加固体碳源选择研究

A Review of Carbon Source Supplement for Denitrification by Constructed Wetlands

为了筛选合适的固体碳源,以玉米秸秆、污泥作为研究对象进行碳源释放规律及预处理实验研究,并从碳源释放量,释放速率、释放C/N比等方面探讨其做为碳源的可行性。结果表明,碱加热预处理后的玉米秸秆碳元素平均释放量为10.31 mg/(g·d),较酸加碱加热预处理方式高0.91 mg/(g·d),但二者氮元素平均释放量相同,均为0.20 mg/(g·d)。污泥经预处理后,碳、氮元素平均释放量分别为8.98 mg/(g·d)、0.21 mg/(g·d)。考虑到污泥作为反硝化碳源可以实现污泥的资源化、减量化和无害化。所以污泥和碱加热处理的玉米秸秆均可作为人工湿地外加碳源。

In this paper, with the aims at screening suitable solid carbon sources, corn straw and residual sludge was selected to study the release patterns of carbon sources and relevant pretreatment experiments, and their feasibility of being carbon sources was also discussed from the aspects of release quantity,release rate and release ratio of carbon to nitrogen. The results showed that after alkali pretreatment, the average release amount of carbon element from the corn straw was 10.31 mg/（g·d）, 0.91 mg/（g·d） higher than that after alkali and acid pretreatment. However, the average release amount of nitrogen after the two pretreatment modes was the same as 0.20 mg/（g·d）. The average amount of carbon and nitrogen elements released from the pre-processed sludge was 8.98 mg/（g·d） and 0.21 mg/（g·d） respectively. It was considered that sludge could be used as carbon source for denitrification and therefore resource recovery, reduction and harmless treatment of sludge could be realized. As a result, alkali pretreated corn straw and residual sludge could be used as carbon source supplement for artificial wetlands.