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British Columbia Mine Reclamation Symposium

Environmental planning for ARD waste : land-dried biosolids and ARD waste rock experiment Renken, Karin

Abstract

Different types of biosolids used as soil amendments have been demonstrated to result in rapid revegetation and environmentally friendly reclamation even in problematic sites such as metalcontaminated and/or acid generating spoils. This paper presents laboratory results of the effect of landdried biosolids on acid generating (AG) waste rock. The impact was determined through analysis of water percolated through soil columns. The experiment consisted of four columns that were subjected to weekly water additions over 8 to 10 hour cycles. Materials in the columns were layered in various combinations using land-dried biosolids, neutral waste rock, AG fines and AG waste rock. The leaching schedule was designed to simulate 17 weeks of non-winter field conditions. Percolate water quality was monitored weekly for: pH, conductivity, sulphate, acidity, alkalinity, dissolved metals and hardness. Waste rock and biosolids were characterized in terms of pH, particle size distribution, and nutrient and total metal concentrations. Acid- Base Accounting (ABA) was performed for both the neutral and AG waste rock and the AG fines. All four columns were saturated and reached the desired baseline condition for data comparison after two leaching cycles. There appeared to be a significant difference between the mass released from columns treated with land-dried biosolids when compared with the control column results. For example, when comparing Column 2 results with its control column results, the mass released from Column 2 between week 3 and week 17 was roughly 50% lower in: acidity at pH 4.5, acidity at pH 8.3, sulphate, aluminum, cobalt, manganese, and phosphorus; 60% lower in iron and arsenic; and 80% lower in zinc and cadmium. The mass collected from Column 2 was about 30% higher for calcium, 45% for hardness and 134% for magnesium in compared with control column results.

Item Metadata

Title
Environmental planning for ARD waste : land-dried biosolids and ARD waste rock experiment
Creator
Renken, Karin
Contributor
British Columbia Mine Reclamation Symposium; University of British Columbia. Norman B. Keevil Institute of Mining Engineering
Date Issued
2000
Description
Different types of biosolids used as soil amendments have been demonstrated to result in rapid revegetation and environmentally friendly reclamation even in problematic sites such as metalcontaminated and/or acid generating spoils. This paper presents laboratory results of the effect of landdried biosolids on acid generating (AG) waste rock. The impact was determined through analysis of water percolated through soil columns. The experiment consisted of four columns that were subjected to weekly water additions over 8 to 10 hour cycles. Materials in the columns were layered in various combinations using land-dried biosolids, neutral waste rock, AG fines and AG waste rock. The leaching schedule was designed to simulate 17 weeks of non-winter field conditions. Percolate water quality was monitored weekly for: pH, conductivity, sulphate, acidity, alkalinity, dissolved metals and hardness. Waste rock and biosolids were characterized in terms of pH, particle size distribution, and nutrient and total metal concentrations. Acid- Base Accounting (ABA) was performed for both the neutral and AG waste rock and the AG fines. All four columns were saturated and reached the desired baseline condition for data comparison after two leaching cycles. There appeared to be a significant difference between the mass released from columns treated with land-dried biosolids when compared with the control column results. For example, when comparing Column 2 results with its control column results, the mass released from Column 2 between week 3 and week 17 was roughly 50% lower in: acidity at pH 4.5, acidity at pH 8.3, sulphate, aluminum, cobalt, manganese, and phosphorus; 60% lower in iron and arsenic; and 80% lower in zinc and cadmium. The mass collected from Column 2 was about 30% higher for calcium, 45% for hardness and 134% for magnesium in compared with control column results.
Extent
1652610 bytes
Genre
Conference Paper
Type
Text
File Format
application/pdf
Language
eng
Date Available
2009-06-23
Provider
Vancouver : University of British Columbia Library
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International
DOI
10.14288/1.0042363
URI
http://hdl.handle.net/2429/9541
Affiliation
Non UBC
Peer Review Status
Unreviewed
Scholarly Level
Other
Copyright Holder
British Columbia Technical and Research Committee on Reclamation
Rights URI
http://creativecommons.org/licenses/by-nc-nd/4.0/
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Attribution-NonCommercial-NoDerivatives 4.0 International