Authors: Staelens, Nathalie; Parkpian, Preeda; Polprasert, Chongrak

Source: Chemical Speciation and Bioavailability, Volume 12, Number 3, August 2000 , pp. 97-107(11)

Publisher: Science Reviews 2000 Ltd

Abstract:

An investigation was carried out into the speciation of metals contained in an industrial sewage sludge dewatered in vertical flow reed beds as compared to conventional sand drying beds. The highly contaminated sludge was loaded for two consecutive months and the dewatered sludge layers were monitored periodically during an ageing period of 15 months. Metal speciation was assessed by means of sequential extraction. The raw sludge was characterised by high metal mobility. 445 mg kg⁻¹ dry matter (DM) Mn (70% of total Mn), 632 mg kg⁻¹ DM Ni (42% of total Ni), 11,246 mg kg⁻¹ DM Fe (32% of total Fe), 2,315 mg kg⁻¹ DM Zn (19% of total Zn) and 258 mg kg⁻¹ DM Pb (14% of total Pb) were retrieved in the exchangeable and acid extractable fractions. Cu and Cr were less mobile, with 24 mg kg⁻¹ DM Cu (1.2% of total Cu) and 7 mg kg⁻¹ DM Cr (0.8% of total Cr) occuring in these fractions.

Upon sludge ageing, all metals except copper, were greatly immobilised in the oxidisable, reducible and residual fractions. However, considerable amounts remained mobile, posing environmental threats upon final disposal of the dewatered sludge.

Keywords: reed beds; sludge dewatering; sequential extraction; metal speciation; industrial sewage studge

Document Type: Research article

DOI: http://dx.doi.org/10.3184/095422900782775517

Affiliations: 1: Environmental Engineering Program, School of Environment, Resources and Development, Asian Institute of Technology, P.O. Box 4 Klong Luang, Pathumthani 12120, Thailand

Publication date: 2000-08-10

More about this publication?

• Chemical Speciation & Bioavailability covers a rapidly expanding area in environmental science.

  Research on the interactions between the chemical forms and behaviour of toxic compounds and their subsequent biological uptake, metabolism and ecological fate involves many scientific fields. These studies are often published in discipline-specific journals, leading to inadequate review and information scatter. This situation hinders both the development of an international community of experienced colleagues and the open flow of information and discussion. Additionally, the importance of speciation and bioavailability research to the development of pollution law and control technologies is being increasingly appreciated by environmental regulatory agencies throughout the world.

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