旱寒黄土区渗滤液灌溉蒸发影响因素初探  

Preliminary Study on Influencing Factors of Leachate Irrigation Evaporation in Arid Loess Area

作　　者：胡泸丹 邵立明[2] 蒲红霞 王素君 魏新庆 何品晶[2] HU Ludan;SHAO Liming;PU Hongxia;WANG Sujun;WEI Xinqing;HE Pinjing(Tianjin JC Environmental Services Co.Ltd.,Tianjin 300202;Institute of Waste Treatment and Reclamation,Tongji University,Shanghai 200092)

机构地区：[1]天津建昌环保股份有限公司,天津300202 [2]同济大学固体废物处理与资源化研究所,上海200092

出　　处：《环境卫生工程》2022年第6期1-5,10,共6页Environmental Sanitation Engineering

基　　金：国家重点研发计划项目(2018YFC1903700);天津市科技领军(培育)企业重大项目(20YDLYSN00030)。

摘　　要：旱寒黄土区蒸发量远高于降雨量,采用灌溉土质覆盖层方式蒸发减量是该区域填埋场渗滤液原位处理的可行途径。为探明蒸发减量的影响因素,在兰州某填埋场,通过模拟覆盖层研究渗滤液灌溉黄土的蒸发量与气象条件、灌溉强度(灌溉后土壤含水量)、渗滤液水质的相关性。结果表明,当地水面蒸发量(E)主要与温度(T)、压强(P)、空气湿度(HUM)、风速(W)、降水量(R)和日照时长(S)相关,拟合方程为E=12.529+0.256T-0.010P-0.062HUM+0.351W-0.007R+0.022S,纯水和渗滤液水面蒸发量存在线性关系;不同土壤含水量(25%、20%和15%)下,渗滤液灌溉的蒸发量随含水量减小而递减,25%含水量时蒸发量是非液化条件下的最大值;依据试验所在地气象数据计算得全年水面蒸发量为1405.82 mm,渗滤液灌溉蒸发量为806.09 mm,单位面积黄土覆盖层全年可蒸发减量渗滤液约0.8 m^(3)/m^(2)。Evaporation is much higher than rainfall in arid loess area,evaporation reduction by irrigating soil cover was a feasible way to treat landfill leachate in situ in this area.In order to find out the influencing factors of evaporation reduction,the correlation between evaporation of loess irrigated by leachate and meteorological conditions,irrigation intensity(soil moisture content after irrigation)and leachate water quality were studied by simulating the cover layer in a landfill in Lanzhou.The results showed that the local water surface evaporation(E)was mainly related to temperature(T),pressure(P),air humidity(HUM),wind speed(W),precipitation(R)and sunshine duration(S).The fitting equation was E=12.529+0.256T-0.010P-0.062HUM+0.351W-0.007R+0.022S.There was a linear relationship between the water surface evaporation of pure water and leachate.Under different soil water content of 25%,20% and 15%,the evaporation of leachate irrigation decreased with the decrease of water content,and the evaporation at 25% water content was the maximum under non-liquefaction conditions.According to the meteorological data of the test site,the annual water surface evaporation was1405.82 mm,and the leachate irrigation evaporation was 806.09 mm.The annual evaporation loss of leachate per unit area of loess overburden was about 0.8 m^(3)/m^(2).

关 键 词：土壤蒸发量 水面蒸发量 渗滤液回灌 多元线性回归 

分 类 号：X703[环境科学与工程—环境工程]