Sousa R.N.,University of British Columbia |
Veiga M.M.,University of British Columbia |
Meech J.,University of British Columbia |
Jokinen J.,University of British Columbia |
Sousa A.J.,Suzano Pulp and Paper
Journal of Cleaner Production | Year: 2011
This paper describes a tool developed to evaluate environmental risks at a Brazilian artisanal small-scale gold mining site. The tool consists of a matrix used to determine the relevance of such risks through the classification of mining activities according to the likelihood that they may cause environmental impacts. The language and method are very simple, and thus appropriate for local stakeholders. It ensures their participation when developing a plan of action for intervention and training. When applied to a pilot site in the Brazilian Amazon, the matrix revealed the variables that pose higher environmental risks. These activities were subsequently addressed in a training program to promote better practices. As a result, the mining activities were improved by 28.8% when comparing compliance to environmental requisites before and after the training program. Specifically, the training program resulted in improved gold recovery, and reduced environmental and health impacts. © 2010 Elsevier Ltd. All rights reserved.
Kim T.J.,North Carolina State University |
Bullock B.P.,University of Georgia |
Stape J.L.,Suzano Pulp and Paper
Forest Ecology and Management | Year: 2015
We examined the change in spatial structures of Eucalyptus plantations across different types of silvicultural treatments over a full rotation. Clonal and seed-origin Eucalyptus plots applied with differing levels of fertilization (high vs. traditional) and irrigation (irrigated vs. non-irrigated) treatments were investigated. Additionally, for the clonal plots, uniform vs. heterogeneous stand structure treatments were created using staggered planting dates. The heterogeneous structure of the clonal plots aimed to mimic the seed-origin plots. Spatial structures were characterized by assessing the spatial autocorrelations of diameters, heights, and biomass. We also applied two distance-based neighborhood structures to look at the degree of change in spatial autocorrelations with different numbers of neighboring trees being defined as neighbors. The results suggest that spatial autocorrelations of diameters, heights, and biomass of Eucalyptus plantations were mostly insignificant at an alpha level of 0.05 over the rotation. However, spatial autocorrelations in most plots after the middle of the rotation were predominantly negative, indicating the occurrence of size differences among neighboring trees. In particular, general declining patterns from positive to negative spatial autocorrelations in diameters and biomass, except for plots with the heterogeneous stand structures, were noted at plots treated with high levels of fertilizer. This suggests that high fertilization may have influenced the realizations of microsite effects in the early stage of stand development. General trends in spatial autocorrelations between the two neighborhood structures considered were mostly similar except for several plots differing in intensities of spatial autocorrelations over the rotation. © 2015 Elsevier B.V.
Chagas V.,Nalco Company |
Lyons R.,Nalco Company |
Veiga L.F.,Nalco Company |
Silva J.,Suzano Pulp and Paper |
And 2 more authors.
Paper360 | Year: 2011
Suzano Pulp and Paper has partnered with Nalco to reduce its water usage. A Key Performance Indicator (KPI) of Suzano's business model is reducing overall costs by improving utilization of fresh water and direct specialty chemicals. Nalco proposed the use of its PARETO Mixing Technology on B7 to address Suzano's sustainability and cost reduction objectives. The hydrodynamics of the system prevents formation of deposits within the optimizer chambers and provide the correct injection velocity to achieve uniform distribution of the chemistries across the applied process stream. The RDF program was integrated with PARETO technology through replacement of the post-screen quill with two PARETO technology nozzles, and moving the APAM to be co-mixed with the silica. The results on Suzano's B7 PM clearly demonstrated how the integration of PARETO Mixing Technology and the resulting application mixing improvements could significantly benefit overall RDF program performance.