农业环境科学学报2013，Vol.32Issue(7)：1473-1478,6.DOI:10.11654/jaes.2013.07.027
镧/铝改性沸石的磷释放条件及再生能力研究
Phosphorus Release Condition and Regenerability of Lanthanum/Aluminum-modified Zeolite
摘要
Abstract
Lanthanum/aluminum-modified zeolite is a new material that is used to remove phosphorus from waste water.For lanthanum/aluminum-modified zeolite has the advantages of high phosphorus removal efficiency,low expense,innocuity,environment friendly,its application prospect is extremely broad.However,use lanthanum/aluminum-modified zeolite to remove phosphorus from waste water has a disadvantage of producing a lot of chemical sludge.And the effective approach of reducing the chemical sludge is to release phosphorus from lanthanum/aluminum-modified zeolite saturated with phosphorus and improve its regenerability.In order to know the best phosphorus release condition of lanthanum/aluminum-modified zeolite saturated with phosphorus,the effect of pH on the release of phosphorus from lanthanum/aluminum-modified zeolite saturated with phosphorus was investigated by adjusting the pH from 2.0 to 13.0 using NaOH and HC1 solutions.And the regenerability of lanthanum/aluminum-modified zeolite was researched simultaneously under the best phosphorus release and best phosphorus adsorption conditions.And the result showed that the amount and ratio of phosphorus releasing from lanthanum/aluminummodified zeolite decreased firstly and then increased when pH changed from 2 to 13.When pH was 2,12 and 13,the phosphorus release ratio was higher than 76％,and the phosphorus release ratio reached the highest point when the pH was 13 and the highest value was 98.2％.When pH ranged from 3 to 11,the phosphorus release ratio was lower than 30％,and the phosphorus release ratio reached the low est point when the pH was 6 and the lowest value was 1.7％.So it could be concluded that strong acid and alkali environment was in favor of phosphorus releasing from lanthanum/aluminum-modified zeolite.The test of the regenerability of lanthanum/aluminum-modified zeolite showed that the phosphorus adsorption amount and the regenerability of lanthanum/aluminum-modified zeolite were 2.367 mg ·g-1,2.336 mg·g-1,2.312 mg·g-1,2.253 mg·g-1 and 96.7％,95.5％,94.5％,92.1％ respectively in the four times of regeneration and adsorption tests.The adsorption ability of lanthanum/aluminum-modified zeolite decreased with the increasing of regeneration time,however,the adsorption ability was still more than 92％,which meant that lanthanum/aluminum-modified zeolite had a good stability and regenerability.关键词
镧/铝改性沸石/磷吸附/磷释放/再生能力Key words
lanthanum/aluminum-modified zeolite/ phosphorus adsorption/ phosphorus release/ regenerability分类
资源环境引用本文复制引用
孟顺龙,胡庚东,瞿建宏,李永丹,张田,陈家长,徐跑..镧/铝改性沸石的磷释放条件及再生能力研究[J].农业环境科学学报,2013,32(7):1473-1478,6.基金项目
中央级公益性科研院所基本科研业务费专项资金项目(2011JBFA03) （2011JBFA03）
现代农业产业技术体系建设专项资金资助(CARS-49) （CARS-49）
