污泥处理湿地自然稳定期温室气体排放规律研究

Study on greenhouse gas emissions from sludge treatment wetland during resting period

污泥处理湿地是一种低能耗且最终产物可以安全处置或农用的污泥处理技术,但在污泥稳定过程中产生的温室气体(CH4、CO2)排放不容忽视。通过原位静态箱法对3个污泥处理湿地(STW1、STW2、STW3)自然稳定期的温室气体排放规律进行比较研究。STW1为具有通风结构的传统污泥干化床,STW2为具有通风结构的芦苇床,STW3为普通芦苇床。研究结果表明,污泥处理湿地在自然稳定期的CH 4排放通量较低,CO2排放通量较高。3个污泥处理湿地的CH 4排放通量表现为STW2>STW3>STW1,CO2排放通量表现为STW1>STW3>STW2。碳基温室气体排放量STW2最低,STW1最高。

The sludge treatment wetland is a sludge treatment technology with low energy consumption and its final product can be safely disposed or used in agriculture.However,the greenhouse gases(CH 4,CO 2)generated during the sludge stabilization process can not be ignored.In this experiment,the in-situ static chamber method was used to study the greenhouse gas emission characteristics of three different sludge treatment wetlands(STW1,STW2,STW3)during resting period.STW1 was a traditional sludge drying bed with ventilation structure,STW2 was a reed bed with ventilation structure,and STW3 was a common reed bed.The results showed that the sludge treatment wetland had a lower CH 4 emission flux and a higher CO 2 emission flux during resting period.The order of CH 4 emission flux from three wetlands was STW2>STW3>STW1,and the order of CO 2 emission flux was STW1>STW3>STW2.Carbon-based greenhouse gas emission from sludge treatment wetland had the lowest value in STW2 and the highest value in STW1.