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

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Title: Environmental planning for ARD waste : land-dried biosolids and ARD waste rock experiment
Author: Renken, Karin
Issue Date: 2000
Publicly Available in cIRcle 2009-06-23
Series/Report no. British Columbia Mine Reclamation Symposium 2000
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.
Affiliation: Applied Science, Faculty of
URI: http://hdl.handle.net/2429/9541
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