HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Van Riemsdijk, W. H. Articles by De Haan, F. A. M. Search for Related Content PubMed Articles by Van Riemsdijk, W. H. Articles by De Haan, F. A. M. Agricola Articles by Van Riemsdijk, W. H. Articles by De Haan, F. A. M.

Phosphates in Soils Treated with Sewage Water: IV. Bonding of Phosphate from Sewage Water in Sand Columns Containing Aluminum Hydroxide¹

ABSTRACT

The reaction of phosphate (P) with Al(OH)₃ can be distinguished by adsorption and a process designated here as long-term reaction. The long-term reaction may remove several times the amount of P removed initially. No long-term reaction of P (0.5 mmol/liter) and Xray amourphous Al(OH)₃ was detected at pH 8. To columns of quartz sand mixed with Al(OH)₃ domestic sewage water (pH 8) was added during 10 mo once every 2 weeks. The phosphate retention in these columns was much higher than could be expected from the pure Al(OH)₃ system experiments, indicating the occurrence of a long-term reaction. Column segments were analyzed for organic-, (Al + Fe)-, and Ca-P. Negligible Ca-P was formed. Electron microscopy and Xray analysis showed quartz particles, Al-containing particles with no detectable P, and particles containing Al, P, and Ca. Formation of the Al-P-Ca particles contributes to the capacity of soils to store or retain P.

Key Words: Ca-Al-phosphate • adsorption • precipitation • long-term reaction • sewage disposal

¹ Contribution from the Lab. of Soils and Fert., Agric. State Univ., 3 De Dreyen, Wageningen, The Netherlands. Support in part by the Comm. on Manure and Odour Problems in Animal Husbandry is gratefully acknowledged.

² Chemist and Soil Scientists, respectively. The third author is also guest coworker of the Inst. for Land and Water Manage. Res., 11 Prinses Marijkeweg, Wageningen, The Netherlands.

Received for publication May 30, 1978.