[Treatment of tannery wastewater by infiltration percolation: chromium removal and speciation in soil].

Abstract:

:The aim of this paper was, on one hand, to study the treatment of raw tannery effluent by infiltration percolation system and, on the other hand, to determine the distribution and speciation of chromium in the used soil. The system pilot consisted of columns filled to 15 cm of gravel and 60 cm of soil (88% of sand). The columns irrigated by raw tannery wastewater with a daily hydraulic load of 5 cm per day (approximately 10 L every day). The water flowed vertically through the soil. The speciation of Cr was investigated by using selective five steps sequential extraction method. The results indicated that the pH of the treated wastewater increases by three units in comparison to the raw wastewater. The electrical conductivity of the effluent increases also after treatment. Over the whole experimental period, results revealed significant performances of infiltration percolation system for organic load reduction. The mean elimination rate was 74% for total COD. In addition, there was a significant accumulation of organic carbon (62%) in the surface strata for the system. The total chromium undergoes an overall removal of 98%. After seven months of experiment, the results indicated that the whole retention of Cr occurring in the surface horizon of the soil (69%). Furthermore, the speciation study of Cr in the soil revealed that the oxidizable fraction is the most represented 55%. The reducible and residual phases represent 17.5% and 18.5%, respectively. The carbonate fraction presented 9% while exchangeable fraction presented only 0.02%.

journal_name

Environ Technol

journal_title

Environmental technology

authors

Tiglyene S,Jaouad A,Mandi L

doi

10.1080/09593330801983888

subject

Has Abstract

pub_date

2008-06-01 00:00:00

pages

613-24

issue

6

eissn

0959-3330

issn

1479-487X

journal_volume

29

pub_type

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