scholarly journals Bioleaching of pollymetallic sulphide concentrate using thermophilic bacteria

2014 ◽  
Vol 68 (5) ◽  
pp. 575-583 ◽  
Author(s):  
Milovan Vukovic ◽  
Nada Strbac ◽  
Miroslav Sokic ◽  
Vesna Grekulovic ◽  
Vladimir Cvetkovski
Keyword(s):  
Bacterial Culture ◽  
Thermophilic Bacteria ◽  
Lead Extraction ◽  
Lead Sulphide ◽  
Lead Sulphate ◽  
High Metal ◽  
Lead Zinc ◽  
Sulphate Media ◽  
Low Solubility ◽  
Copper Lead

An extreme thermophilic, iron-sulphur oxidising bacterial culture was isolated and adapted to tolerate high metal and solids concentrations at 70?C. Following isolation and adaptation, the culture was used in a batch bioleach test employing a 5-l glass standard magnetic agitated and aerated reactor, for the bioleaching of a copper-lead-zinc collective concentrate. The culture exhibited stable leach performance over the period of leach operation and overall copper and zinc extractions higher than 97%. Lead sulphide is transformed into lead sulphate remaining in the bioleach residue due to the low solubility in sulphate media. Brine leaching of bioleach residue yields 95% lead extraction.

Influence of Feeding Dehydrated Poultry Waste on Composition and Organoleptic Quality of Milk1

1977 ◽  
Vol 40 (1) ◽  
pp. 29-31 ◽  
Author(s):  
J. C. BRUHN ◽  
G. D. REIF ◽  
H. TOONE ◽  
J. H. EVANS
Keyword(s):  
Dairy Cows ◽  
Milk Quality ◽  
Poultry Waste ◽  
Quality Factors ◽  
Lactating Dairy Cows ◽  
Period 2 ◽  
Lead Zinc ◽  
Copper Lead ◽  
Composite Samples

A double reversal trial with three, 4-week periods was used to determine the effect on milk quality of feeding dehydrated poultry waste to lactating dairy cows. Fifteen cows were fed a control ration for 4 weeks (Period 1), followed by an experimental ration containing dehydrated poultry waste for 4 weeks (Period 2), and then by the control ration for 4 weeks (Period 3). Milk was collected daily and scored by five judges using the ADSA milk flavor scoring guide. Milk compsition (fat, protein, lactose, and solids-not-fat) was determined on alternate days. During Periods 2 and 3 weekly composite samples were collected to determine concentrations of cadmium, copper, lead, zinc, and tocopherol. No significant differences were found in any of the milk quality factors studied.

Distribution and significance of copper, lead, zinc and cadmium in the Corio Bay ecosystem

1981 ◽  
Vol 32 (2) ◽  
pp. 151 ◽  
Author(s):  
JD Smith ◽  
ECV Butler ◽  
BR Grant ◽  
GW Little ◽  
N Millis ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Nutrient Cycling ◽  
Mytilus Edulis ◽  
Water Exchange ◽  
Dry Weight ◽  
Weight Basis ◽  
Threshold Levels ◽  
Lead Zinc ◽  
Significant Interference ◽  
Copper Lead

Levels of copper, lead, zinc and cadmium in sediments, waters and mussels (Mytilus edulis) from Corio Bay (Vic.) were measured on two occasions in 1977. The bay has restricted water exchange with Port Phillip Bay and is known to have received a major input of cadmium. The respective concentrations of copper, lead, zinc and cadmium in the sediments were 2-50,2-2l0,4-398 and up to 12.6 �g/g; in the unfiltered waters, I .5-25, <0.4-11, 3.9-67 and 0.11-5.6 �g/l; and in the mussels, 4.8-21. 1.2-9.7, 105-110 and 9.8-53 �g/g on a dry weight basis. The observed levels of heavy metals are compared with threshold levels reported in the literature as causing significant interference with growth of phytoplankton and nutrient cycling by bacterial processes.

Sign in / Sign up

Export Citation Format

Share Document