通风策略对污泥生物干化过程中含氮气体和甲烷排放的影响  

Effect of Aeration Strategies on Emissions of Nitrogenous Gases and Methane During Sludge Bio-Drying

作　　者：齐鲁[1,2] 魏源送[1,3] 张俊亚[1] 赵晨阳[1,2] 才兴[4] 张媛丽 邵春岩[4] 李洪枚[2] 

机构地区：[1]中国科学院生态环境研究中心,北京100085 [2]首都经济贸易大学安全与环境工程学院,北京100070 [3]鄂尔多斯固体废弃物资源化工程技术研究所,鄂尔多斯017000 [4]沈阳环境科学研究院,沈阳110016 [5]沈阳振兴污泥处置有限公司,沈阳110000

出　　处：《环境科学》2016年第1期366-376,共11页Environmental Science

基　　金：国家水体污染控制与治理科技重大专项(2012ZX07208-07);国家自然科学基金项目(21377151)

摘　　要：我国污泥生物干化过程中含氮气体(NH_3、N_2O、NO)排放的数据十分缺乏,尤其是NO,因其化学性质极其活泼,在以往的研究中甚少涉及.本研究以东北某大型污泥生物干化厂的连续流强制通风槽式污泥生物干化为研究对象,通过现场试验,考察不同通风策略下干化效率以及含氮气体、温室气体的排放特征.结果表明,当污泥初始含水率约50%时,采用前期供氧为主、中期温度控制为主、后期以除湿和散热为目的的通风策略,可以明显加快污泥干化速率(试验组在第11 d时的含水率为36.6%,对照组为42%),提升干化效果(最终含水率试验组为33.6%,对照组为37.6%),减少氨气累积排放量5%(试验组氨气累积排放为208 mg·m^(-3),对照组为219.8 mg·m^(-3));同时降低温室气体累积排放当量[试验组每吨干物料的温室气体排放当量(eCO_2)为3.61 kg·t^(-1),对照组为3.73 kg·t^(-1)].但NO累积排放量试验组比对照组高出15.9%(试验组为1.9g·m^(-2),对照组为1.6 g·m^(-2)).The data on nitrogen gas（NH3,N2O,NO） emissions during sludge bio-drying process in China is scarce,especially NO due to its unstable chemical property.In this study,effect of two aeration modes on emissions of methane and nitrogenous gas was compared during the continuous aerated turning pile sludge bio-drying process at full scale.In these two aeration strategies,the one currently used in the plant was set as the control,and the other was set as the test in which the aeration was used for oxygen supply,pile temperature control,and moisture removal in the start-up,middle and final stages,respectively.The results showed that the aeration strategy used in the test could not only obviously accelerate the rate of sludge drying（the moisture contents of the test and the control were 36.6%and 42%on day 11）,but also had a better drying performance（the final moisture contents of the test and the control were 33.6%and 37.6%,respectively） and decreased the ammonia cumulative emission by 5%,（ammonia cumulative emission of the test and the control were 208 mg·m^-3 and 219.8 mg·m^-3,respectively）.Though a lower accumulated emission（eCO2） of greenhouse gas in the test at 3.61 kg·t^-1 was observed than that of the control（3.73 kg·t^-1 dry weight）,the cumulative emission of NO in the test at 1.9 g·m^-2 was 15.9%higher than that of the control（1.6 g·m^-2）.

关 键 词：污泥 生物干化 通风策略 含氮气体 温室气体 

分 类 号：X16[环境科学与工程—环境科学] X703