摘要
Abstract
A pilot experiment on the purification effect of slightly polluted river water was carried out by using a field gravel corridor.The results showed that at different seasons(autumn,spring and summer),the first section of the gravel corridor had a better purification effect on COD and NH3-N,with purification efficiencies of 25.3％～33.8％and 37.6％～86.2％,respectively.The second and third sections have relatively low purification efficiency,with insignificant purification effects.With the increasing hydraulic load(0.05～0.07 m3/(m2·d),0.08～0.11 m3/(m2·d),0.12～0.16 m3/(m2·d)),the purification efficiency of the corridor for COD and NH3-N gradually decreased.The COD purification efficiency is 72.2％,67.3％,and 41.2％,and the NH3-N purification efficiency was 94.3％,64.4％,and 60.3％.Relatively,at different seasons and hydraulic loads,the purification effect of gravel corridor on NH3-N is more stable and efficient than on COD.Pilot experiments showed that gravel corridors had a good purification effect on COD and NH3-N in slightly polluted river water.Determining the optimal runoff length,filler ratio and hydraulic load of the corridor can promote its practical engineering application.关键词
砾石廊道/微污染河水/净化效果/水力负荷Key words
Gravel corridor/slightly polluted river water/purification effect/hydraulic load分类
资源环境
