期刊
ECOLOGICAL ENGINEERING
卷 35, 期 11, 页码 1599-1602出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ecoleng.2008.08.002
关键词
Internal P pollution control; LaCl3-modified clays; Eutrophication; P fixation
资金
- National Key Technologies RD Programme [2002AA601011]
- Chinese NNSF [20177029]
- National Key Project for Basic Research [2002CB412308]
Fourteen types of clay, including soils and sediments from Lake Taihu, were modified by LaCl3, and their abilities of phosphorus (P) sorption (the total P up-taken) and fixation (the unleachable P retained in modified clays) were investigated. Results showed that P sorption rates of LaCl3-modified clays were all higher than 90%, while the fixation rates were raised from 3-14% to 52-95%. Kaolinite was selected to study the pH effect on P sorption and desorption of La3+ from the modified clays. In the pH range of 4-8, P sorption on LaCl3-modified kaolinite could reach over 80%, with a maximum of 97% at pH 5. The desorption rate of La3+ decreased with the increase of pH, which was lower than <0.006% at pH > 6.12. This study may provide a solution for internal P pollution from lake sediments. (C) 2008 Elsevier B.V. All rights reserved.
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