摘要
为研究生物质炭材料对河道底泥中氮磷持留的影响与铜的稳定化效果,作者以水葫芦作为原材料,采用一步浸渍-焙烧法优化制备镁基生物质炭(MgO@BC),并将其作为稳定化材料,按比例0%(CK)、0.1%、1%、2%添加到污染底泥中。通过稳定化试验,研究MgO@BC对污染底泥理化性质、氮磷持留效果、铜浸出毒性(TCLP)与形态分布的影响。结果表明:稳定化处理75 d后,底泥的pH、电导率(EC)、有机质(SOM)有所提高;阳离子交换量(CEC)稍有降低;相较CK组,添加镁基生物质炭对河道底泥中的有效磷有了明显的持留效果,并且将底泥中的氨氮含量降低到了合适的范围;1%、2%的MgO@BC添加量可将TCLP提取态Cu含量分别降低9.54%、26.98%,铜的稳定形态(F3+F4)的比例稍有增加。表明MgO@BC可作为一种良好的重金属稳定化材料应用于河道底泥的修复领域。
In order to study the effect of biomass charcoal material on nitrogen and phosphorus retention and copper stabiliza⁃tion in river sediment,water hyacinth was used as raw material to prepare the biomass biochar(MgO@BC)by one-step impregnation-roasting method.The prepared biochar(MgO@BC)was added to polluted river sediments at the proportions of 0%(CK),0.1%,1%,and 2%as the stabilization material.The effects of MgO@BC on the physicochemical properties,nitrogen and phosphorus retention,copper leaching toxicity(TCLP)and morphological distribution of the contaminated sediment were investigated by the stabilization test.The results showed that after 75 d of stabilization treatment,the pH,electrical conductivity(EC),and organic matter(SOM)of the sediment were increased and the cation exchange capacity(CEC)was slightly decreased.Compared with the CK group,the addition of magnesium-based biomass charcoal(MgO@BC)had a significant retention effect on the effective phosphorus in the river sediment,and the ammonia and nitrogen content in the sediment was reduced to the appropriate range.The additions of 1%and 2%of MgO@BC can reduce the TCLP-Cu content by 9.54%and 26.98%,respectively,and the proportion of the stabilized form of Cu(F3+F4)was slightly increased.It showed that MgO@BC can be used as a good heavy metal stabilization material in the field of river sediment remediation.
作者
胡宗泉
余冰星
王海玲
孙玉桢
冯长江
HU Zongquan;YU Bingxing;WANG Hailing;SUN Yuzhen;FENG Changjiang(School of Environmental Science and Engineering,Nanjing Tech University,Nanjing 211816,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2024年第3期146-153,共8页
Environmental Science & Technology
基金
江苏省研究生实践创新计划(SJCX22-0449)。
关键词
镁基生物炭
污染河道底泥
有效磷
铜
稳定化
magnesium-based biochar
contaminated river sediment
effective phosphorus
copper
stabilization
