摘要
通过室内模拟实验对方解石、天然沸石、无机盐(NaCl和CaCl2)改性沸石、有机改性沸石覆盖层对富营养化水体沉积物中磷的固定化效果进行研究。结果表明,方解石、天然沸石对沉积物中的磷均有一定的固定效果,且方解石的固定效果好于天然沸石。无机盐改性沸石对磷的固定化效果的顺序为CaCl2改性沸石>方解石>NaCl改性沸石>天然沸石。有机改性沸石对沉积物中磷的固定效果大于天然沸石和方解石,且覆盖层越厚固定效果越好。复合覆盖层对沉积物中磷的固定效果受天然沸石投加量、方解石投加量以及二者组合方式等因素的影响,随着天然沸石和方解石投加量的增加(100～300g),复合覆盖层对沉积物中磷的固定效果明显提高(67.10%～84.10%)。天然沸石和方解石混合覆盖层比单一天然沸石或方解石覆盖层能更有效地控制沉积物磷的释放。先覆盖天然沸石后覆盖方解石对沉积物磷释放的抑制率明显高于先覆盖方解石后覆盖天然沸石。
The control of calcite,natural zeolite,inorganic（NaCl and CaCl 2）modified zeolite,organic modified zeolite layer on phosphorus in sediments from eutrophic water was studied by simulation experiment.The results showed that calcite and natural zeolite had better control effects on phosphorus in sediments,and the control effect of calcite was greater than that of natural zeolite.The control effect of inorganic modified zeolite on phosphate followed the order of CaCl 2 modified zeolite calcite NaCl modified zeolite natural zeolite.The control effect of organic modified zeolite on phosphorus in the sediment was greater than that of the natural zeolite and calcite,and the thicker cover layer,the better immobilization effect.The efficiency of the mixed over layer to immobilize the phosphorus in sediments was increased with the increment of the quantity of zeolite or calcite.Over layer of mixed calcite and natural zeolite could better control phosphorus in sediment than that of single cover layer of natural zeolite and calcite.The construction mode of the mixed over layer played an important role in the control efficiency of phosphorus release from the sediments.The results indicated that the mixed over layer with natural zeolite（underlayer） and calcite（superstratum）could control phosphorus release much more efficiently than the mixed over layer with zeolite（superstratum）and calcite（underlayer）.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2012年第10期2013-2018,共6页
Journal of Agro-Environment Science
基金
国家科技支撑计划(2012BAD15B05)
吉林农业大学启动基金(201017)
吉林省科技厅项目(20100431)
关键词
方解石
天然沸石
改性沸石
沉积物
磷
固定化
calcite
natural zeolite
modification zeolite
sediment
phosphorus
immobilization
