Improving engineering properties of mature fine tailings using Tubifex-Reference-Cited by-同舟云学术

Improving engineering properties of mature fine tailings using Tubifex

Published:2020-07 Issue:7 Volume:47 Page:812-821
ISSN:0315-1468
Container-title:Canadian Journal of Civil Engineering
language:en
Short-container-title:Can. J. Civ. Eng.

Author:

Yang Xiaojuan¹²,de Lucas Pardo Miguel³,Ibanez Maria⁴,Deng Lijun⁵,Sittoni Luca³,Ulrich Ania⁵,Chen Qun²

Affiliation:

1. PowerChina Huadong Engineering Corporation Limited, Hangzhou 311122, China.

2. State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China.

3. Deltares, Ecosystem and Sediment Dynamics, Postbus 177, 2600 MH Delft, the Netherlands.

4. Antea Group, Roderveldlaan 1, 2600 Antwerpen, Belgium.

5. Department of Civil and Environmental Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada.

Abstract

The present study investigated the effects of Tubifex (Oligochaeta: Tubificidae) treatment on the dewatering process of mature fine tailings (MFT). Experiments testing the survival rate showed that Tubifex can survive at 20 °C and 4 °C. MFT with initial solids content (Sc) of 30% of total mass were treated in 11 settling columns by three Tubifex densities, 1400, 2000 and 4200 individuals·m−2. Test results showed that the mean survival rate at 20 °C and 4 °C on the 28th day stayed around 85%. Tubifex enhanced MFT dewatering by providing compacted tailings with 11.6% and 66.7% higher Sc and undrained shear strength compared with nontreated tailings. Tubifex accelerated pore water pressure dissipation. Tubifex did not affect the chemical composition of tailings except for a decrease in sulfate content. The Sc of tailings treated by Tubifex increased by 67.4% within nine months, which was 129% greater than the Sc increase of the nontreated tailings after 11 months.

Publisher

Canadian Science Publishing

Subject

General Environmental Science,Civil and Structural Engineering

Link

http://www.nrcresearchpress.com/doi/pdf/10.1139/cjce-2019-0028

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