PHOSPHATES AND AMMONIA RECOVERY FROM SECONDARY EFFLUENTS BY SELECTIVE ION-EXCHANGE WITH PRODUCTION OF A SLOW-RELEASE FERTILIZER

被引：26

作者：

LIBERTI, L ^{[1
]}

BOARI, G ^{[1
]}

PASSINO, R ^{[1
]}

机构：

[1] CNR,IST RIC SULLE ACQUE,I-00198 ROMA,ITALY

来源：

WATER RESEARCH | 1979年 / 13卷 / 01期

关键词：

D O I：

10.1016/0043-1354(79)90256-2

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

A process for the reduction of eutrophic potential in urban secondary effluents. which comprises the selective exchange of phosphates on a weak anion resin and of ammonia on clinoptilolite, is described. Sodium chloride is used to regenerate both resins, with some Ca(OH)2 added for clinoptilolite. By adding Mg(OH)2, eventually precipitated with lime from sea water, the premium quality, slow-release fertilizer MgNH4PO4-6H2O is recovered from the concentrated regeneration streams, which can then be recycled. Laboratory evaluations of the hydrolysis extent of the weak anion resin in the presence of bicarbonates showed that a steady-state is attained with resin exchange capacity reproducibly averaging about 80 mmol phosphates 1,-. The preliminary runs on a pilot plant for the tertiary treatment of urban sewage are also presented. © 1979.

引用

页码：65 / 73

页数：9

共 19 条

[1] EXCHANGE EQUILIBRIA ON ANION RESINS [J].