当前位置：
X-MOL 学术
›
Ecol. Eng.
›
论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Evalution of the fate of greenhouse gas emissions from the sludge mineralisation process in Sludge Treatment Wetlands
Ecological Engineering ( IF 3.8 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.ecoleng.2020.106124 Junyu Liang , Yubo Cui , Mingyue Zhang , Zhaobo Chen , Shiquan Wang , Xiaoxiang Li
Ecological Engineering ( IF 3.8 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.ecoleng.2020.106124 Junyu Liang , Yubo Cui , Mingyue Zhang , Zhaobo Chen , Shiquan Wang , Xiaoxiang Li
Abstract Mineralisation process of Greenhouse gas (GHG) emission data from a sludge treatment wetlands (STWs) has been lacked currently. A study was conducted to quantify the release rates of carbon dioxide (CO2) and methane (CH4) from three similar pilot-scale STW units in relation to seasonal change based on the release rates in order to estimate annual GHG release rates of mineralisation process. A static transparent chamber was adopted to measure gas emission without interference of absorption of sunlight by plants for photosynthesis. The three pilot configurations were unit STW1 with ventilation, unit STW2 with ventilation and reed plantings and unit STW3 with reed plantings; all located at Dakai wastewater treatment plant (WWTP), Dalian, China. The resting and loading periods were measured from April to November 2016 and then from April to November 2017, respectively. The results revealed that the release rates of CO2 and CH4 were significantly influenced by seasonal change: the highest release rates were recorded in summer and the lowest rates were recorded in winter. During both seasons, CH4 releases during the resting period (negligible to 2.96 mg CH4 m−2 d−1) were lower than that during the loading period (34 to 1492 CH4 mg mm−2 d−1) while CO2releases were higher during the resting period (1368 to 81,911 mg CO2 m−2 d−1) than that of the loading period (1351 to 30,872 mg CO2 m−2 d−1). Additionally, the presence of plants showed significant impact on GHG emissions i.e. CH4 emissions from STW2 and STW3 were higher than that of STW1. Comparison of data between STW2 and STW3 showed that CH4 and CO2 emissions were reduced in the presence of ventilation. Meanwhile, the measurement of residual sludge moisture content showed that STW2 had higher dewatering and mineralisation efficiencies compared to STW3 and STW1. The annual CO2-eq CH4 emissions from the three STWs during loading and resting periods were in sequence as STW3 > STW2 > STW1, and the recorded annual CO2-eq CH4 during the loading period was higher than that during the resting period.
更新日期：2021-01-01
京公网安备 11010802027423号