摘要
以土+砂+腐熟秸秆(SSJ)以及土+砂+生物质炭(SSS)为城市绿地换填介质,研究其在添加PAM质量浓度为0~1.5%时的理化性质变化,探寻PAM的适宜用量,以期为城市绿地土壤换填提供一定的理论和技术支撑。结果表明:添加PAM能够降低换填介质的容重,提高其饱和导水率和饱和含水量,且容重和饱和导水率随PAM用量的变化可以用二次曲线来描述。当PAM用量为1.5%时,换填介质的饱和导水率较PAM用量为1.0%时有下降的趋势,而容重则有上升的趋势。添加PAM可降低介质的COD解吸量。SSJ换填介质随PAM用量的增加,其氮、磷解吸量表现出增加趋势,而SSS换填介质随PAM用量的增加其氮、磷解吸量呈现出先减小后增大的变化趋势。综合来看,在PAM添加浓度为0~1.5%时,SSS介质优于SSJ介质。PAM在用量为1.0%时可以最大程度提高介质的保水和导水能力,降低COD解吸量。
In this experiment,soil mixed with sand and composted straw(SSJ)and soil mixed with sand andbiochar(SSS)were used as the replacement media for urban green space to explore their changes in physical and chemical properties after adding PAM with concentration of 0~1.5%.The suitable dosage of PAM was expected to be found to provide theoretical and technical support for soil refilling in urban green space.The results showed that adding PAM could reduce the bulk density of the media,and increase the saturated hydraulic conductivity and saturated water content.The change trend of bulk density and saturated hydraulic conductivity with the increasing of PAM could be described by a quadratic curve.However,when the PAM dosage was 1.5%,the saturated hydraulic conductivity showed a tendency to decrease compared with the PAM dosage of 1.0%.Whereas the bulk density showed an upward trend.The application of PAM could reduce COD desorption quantity of the media.With the increasing of PAM dosage,the nitrogen and phosphorus desorption of SSJ media showed an increase trend,while the nitrogen and phosphorus desorption of SSS media decreased first and then increased.On the whole,the SSS media was superior to the SSJ media when the PAM concentration was 0~1.5%.When the dosage of PAM was 1.0%,it could improve the water retention and water conductivity capacity of media to the greatest extent,and reduce COD desorption.
作者
王晨光
郝珊
陆思旭
张阿凤
王旭东
马笑
马越
WANG Chenguang;HAO Shan;LU Sixu;ZHANG Afeng;WANG Xudong;MA Xiao;MA Yue(College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100;Sponge City Technology Center, Fengxi New Town, Xixian New District, Xianyang, Shaanxi 712000)
出处
《水土保持学报》
CSCD
北大核心
2020年第3期356-361,共6页
Journal of Soil and Water Conservation
基金
西咸新区海绵城市绿地土壤换填介质应用技术研究项目(2017ZDXM-SF-083)。
