摘要
以蒙脱石为吸附材料,研究了蒙脱石投加量、pH对其吸附沼液中COD、TN、TP、NH_4^+-N、Zn、Cu、Cr、As、Mn、Ni的影响,并阐述了吸附过程中沼液理化性质与重金属之间的关系。结果表明:蒙脱石投加量为0～50g/L时,COD、TN、NH_4^+-N、TP、Zn、Cu的吸附量随投加量增加逐渐降低,去除率先增加后趋于平衡,投加量为30g/L时吸附效果较好,为适宜投加量。pH为6.5～9.5时,蒙脱石对沼液中TP、Zn、Cu吸附作用较显著,最大去除率可达84.3%、86.8%、94.5%,但对TN、NH_4^+-N、Cr的吸附作用较差,综合吸附量和去除率,7.5～8.5是蒙脱石吸附沼液的适宜pH。Zata电位与电导率、COD、TP、TN、NH_4^+-N、Zn、Cu、Ni之间呈显著负相关,Zn与Cu和Cr与pH呈显著正相关,Cr与TP呈显著负相关,Cr与As不相关。
Montmorillonite was used as adsorption material to study the effects of different dosages and pH on COD,TP,TN,NH4+-N,Zn,Cu,Cr,As,Mn and Ni of biogas slurry,and the interaction between physicochemical properties and heavy metals of biogas slurry was clarified.The results showed that the adsorption capacity of COD,TN,NH4^+-N,TP,Zn and Cu in biogas slurry decreased with the increase of the montmorillonite dosage of 0~50 g/L,and the removal rate increased and then tended to be balanced.At the dosage of 30 g/L,the adsorption effect was better.Under the proper condition with pH of 6.5~9.5,montmorillonite can effectively absorb TP,Zn and Cu in biogas slurry,with maximal removal rate of 84.3%,86.8%and 94.5%,and it has a poor adsorption effect on TN,NH4+-N and Cr.According to the adsorption capacity and removal rate,the appropriate pH of montmorillonite adsorbing biogas slurry was 7.5~8.5.Zata potential was significantly negatively correlated with COD,TP,TN,NH4+-N,Zn,Cu,Ni.The strongest positive correlation was presented between Zn and Cu,and Cr and pH in biogas slurry.Cr and TP had a negative remarkably relationship,and Cr and As was not significantly correlated.
作者
蔡敏
冯露
李富程
陈少航
CAI Min;FENG Lu;LI Fu-cheng;CHEN Shao-hang(School of Resource&Environment,Southwest University of Science and Technology,Mianyang 621010,China;Chengdu Haoyusiyuan Environment Technology Co.,Ltd.,Chengdu 610000,China)
出处
《广东农业科学》
CAS
2018年第12期62-68,共7页
Guangdong Agricultural Sciences
基金
国家科技支撑计划项目(2015BAC05B05)
西南科技大学龙山学术人才科研支持计划项目(18lzx618)
关键词
蒙脱石
沼液
吸附量
重金属
碳
氮
磷
Montmorillonite
biogas slurry
adsorption capacity
heavy metal
carbon
nitrogen
phosphorus
