Weathering studies of Bougainville mine tailings in lysimeters

Soil Research ◽  
1979 ◽  
Vol 17 (2) ◽  
pp. 355 ◽  
Author(s):  
A Hartley
Keyword(s):  
Mine Tailings ◽  
Tropical Conditions ◽  
Sulfide Tailing

Lysimeter studies indicated that under wet tropical conditions, there was significant sulfur depletion in the upper strata of low sulfide tailing deposits within three years of exposure. The rate of acidification was influenced by drainage and aeration, and pH fell logarithmically with time. Copper mobilized by acidification was redeposited within the profile where the pH remained in excess of 7.

Cuiabá Mine Tailings and Backfill System

2005 ◽  
Author(s):  
Walter de Moura ◽  
Edvaldo Barbosa ◽  
Wayne Grobbelaar ◽  
Steve Dorman
Keyword(s):  
Mine Tailings

Comparative study of domestic wastewater treatment efficiencies between facultative pond and water spinach pond

1995 ◽  
Vol 32 (3) ◽  
pp. 263-270 ◽  
Author(s):  
Seni Karnchanawong ◽  
Jaras Sanjitt
Keyword(s):  
Growth Rates ◽  
Domestic Wastewater ◽  
Pilot Scale ◽  
Organic Content ◽  
Water Spinach ◽  
Removal Rates ◽  
Mass Removal ◽  
Loading Rates ◽  
Tropical Conditions ◽  
Average Water

Two pilot-scale studies were comparatively conducted under tropical conditions during December 1992 to September 1993. One study involved facultative ponds(FP) and the others water spinach ponds(SP). Four rectangular concrete ponds, 0.8 m × 2.4 m × 1.1 m (width × length × depth), were employed to treat the Chiang Mai University campus wastewater. Water spinach (Ipomoea aquatica) was planted in two of the ponds. The influent characteristics noted showed a low organic content, i.e. BOD 25.4-29.9 mg/l, with BOD:N ratio around 1:1. The investigations were conducted using the following hydraulic retention times (HRT): 1.6, 2, 2.7, 4, 8 and 16 d. The results showed that the BOD, COD and SS mass removal rates increased as the mass loading rates increased and the SP was significantly more effective in reducing the organic content than the FP. No relationship was found between TN mass removal and the loading rates. However, the TP mass removal rates in the SP and the FP were rather low and were considered to be insignificant. It was observed that SS accumulated in the water spinach root systems which tended to act as a strainer. This process led to plant growth inhibition and finally die-off. The average water spinach growth rates varied from 37 to 107 g wet wt./(m2.d) and no relationship was established between the growth rates and the HRT.

A simple design and operation for the anaerobic treatment of highly concentrated swine waste in the tropics

1995 ◽  
Vol 32 (12) ◽  
pp. 91-97 ◽  
Author(s):  
P. Y. Yang ◽  
M. Kuroshima
Keyword(s):  
Treatment Process ◽  
Total Solid ◽  
Anaerobic Treatment ◽  
Solid Content ◽  
Total Solid Content ◽  
Treatment Processes ◽  
Tropical Conditions ◽  
Biological Reaction ◽  
The Tropics ◽  
Small Producers

In order to develop a simple operation for an anaerobic treatment process for highly concentrated pig wastewater for small producers, a three-stage anaerobic treatment process was investigated. The system provided a series of mixing, homogenization, biological reaction and final stabilization of concentrated pig waste (total solid content of 8–10%). The process provided a stable operational performance, simple operational procedure and well stabilized sludge effluent. It was also found that the system is economically feasible in Hawaii. Compared to the other treatment processes for highly concentrated pig waste, this process is considered as an appropriate alternative for the application of the small producers in land limited and tropical conditions. Also, the present treatment system can be easily developed into a prefabricated package plant which can minimize the on-site labor and building costs.

THE FORGOTTEN ENVIRONMENTAL PASSIVES: IMPLICATIONS AND NEED OF AN INVENTORY OF ABANDONED MINE TAILINGS IN SONORA, MEXICO

2017 ◽  
Author(s):  
R. Del Rio-Salas ◽  
◽  
V. Moreno-Rodriguez ◽  
H. Mendívil-Quijada ◽  
F. Molina-Freaner ◽  
...  
Keyword(s):  
Mine Tailings ◽  
Abandoned Mine ◽  
Abandoned Mine Tailings
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