摘要
通过青叶碧玉在铬铁废液中的培养实验,考察了青叶碧玉对三种不同浓度的废液中铬和铁的吸收能力以及对废液pH值的影响。结果表明,青叶碧玉对废液中的铬和铁的吸收能力较好,当植物放入废液中,随着植物培养时间的延长,3组不同浓度废液中的铬和铁含量均呈下降趋势。在浓度最高的废液中(其中铬和铁浓度分别为15.00和27.73 mg/L,pH为5.08),放入植物后的第3天,此废液中的铬浓度降至6.37 mg/L,其去除率均值达58%;铁浓度降至18.45 mg/L,其去除率均值达34%。培养第12天时,废液中的铬和铁去除率近100%,pH为6.5。铬和铁离子浓度随时间的变化可用一级反应动力学方程描述。废液经青叶碧玉吸收后,可以达到污水排放标准。
Peperomia polybotrya was cultured in wastewater containing chromite and iron ions, and its adsorption capacity of the two ions in 3 kinds of wastewater, as well as its influence on pH value were discussed. Results showed that Peperomia polybotrya has good effect on removal of the two ions. With the increase of culture time, the concentrations of the two ions were also decreased. In the highest level of wastewater in which the concentrations of chromite and iron ion were 15.00 and 27.73 mg/L and pH value was 5.08, the concentration of chromite ion reduced from 15.00 to 6.37 mg/L and the removal rate was 58%, at the same time the concentration of iron ion decreased from 27.73 to 18.45 mg/L and the removal rate was 34% after 3 days. After 12 days the removal rates of the two ions were also 100%, and pH value was up to 6.5. A first order kinetic approach was used to describe the change of chromite and iron ions contents in wastewater. Peperomia polybotrya is a good purifying plant that could be used to ecological removal of heavy metal for the wastewater.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2014年第10期77-80,共4页
Environmental Science & Technology
基金
甘肃省科技支撑计划(2009GS03453)
兰州市科技发展计划项目(2010-2-126)
关键词
铬铁废液
重金属
植物
净化
wastewater containing chromite and iron ions
heavy metal
plant
purification
