Evaluation of fine organic mixtures for treatment of acid mine drainage in sulfidogenic reactors

Author:

Pérez N.12,Schwarz A.13,de Bruijn J.4

Affiliation:

1. Centro de Recursos Hídricos para la agricultura y Minería (CRHIAM), Universidad de Concepción, Barrio Universitario sn, Concepción, Chile

2. Departamento de Acuicultura, Universidad Católica del Norte, Facultad de Ciencias del Mar, Larrondo 1281, P.O. Box 117, Coquimbo, Chile and Escuela de Prevención de Riesgos y Medio Ambiente, Facultad de Ciencias del Mar, Universidad Católica del Norte

3. Departamento de Ingeniería Civil, Universidad de Concepción, Barrio Universitario sn, Concepción, Chile

4. Facultad de Ingeniería Agrícola, Universidad de Concepción, Avenida Vicente Méndez 595, Chillán, Chile

Abstract

Abstract The performance of passive biochemical reactors in acid mine drainage (AMD) treatment could be enhanced by using fine organic substrates in new reactor designs, such as diffusive exchange reactors. This work evaluated the effect of fine cellulosic components in organic mixtures and of enrichment with inoculum, on sulfate and metals removal in discontinuous cultures for three types of synthetic AMD. The cellulosic substrates evaluated were sawdust, microcrystalline cellulose, and forestry cellulose fibers, supplemented with cow manure and leaf compost. Using microcrystalline cellulose and forestry cellulose fibers with the less concentrated AMD, high sulfate reduction rates (73 mg/L-d and 58.2 mg/L-d, respectively) were achieved. Correspondingly, iron concentrations were reduced by 69% and 86.6%. Based on their higher sulfate reducing capacity, cellulose fibers obtained as fiber boards from a local kraft pulp mill were selected for treating a synthetic AMD with a high copper concentration (273 mg/L) and pH 4.94. In batch culture, low sulfate reducing activity (13.10 mg/L-d) was only observed at the highest substrate/AMD ratio (0.5:10) tested. Results show that the use of forestry cellulose fibers in reactive mixtures supplemented with inoculum could be an alternative for optimization of diffusive exchange reactors for AMD treatment.

Publisher

IWA Publishing

Subject

Water Science and Technology,Environmental Engineering

Reference34 articles.

1. Section D4972-95a, vol. 04.08. Standard test method for pH of soils;American Society for Testing and Materials (ASTM),1995

2. Use of cellulosic substrates for the microbial treatment of acid mine drainage;J. Environ. Qual.,1994

3. Geochemistry of a permeable reactive barrier for metals and acid mine drainage;Environ. Sci. Technol.,1999

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