Characterization of wood biochar and evaluation of its adsorption potential for removal of sulphate from produced water in offshore oil and gas industry

This thesis analyses the potential of wood biochar as an adsorbent in removal of sulphate from produced water. In worldwide offshore oil and gas industry, a large volume of waste water is generated as produced water. Sulphur compounds present in these produced water streams can cause environmental problems, regulatory problems and operational issues. Among the various sulphur removal technologies, the adsorption technique is considered as a suitable method since the design is simple, compact, economical and robust. Biochar has been studied as an adsorbent for removal of contaminants from water in a number of studies due to its low cost, potential availability, and adsorptive characteristics. In this study, biochar produced through fast pyrolysis of bark, hardwood sawdust, and softwood sawdust were characterized through a series of tests and were analysed for adsorbent properties. Treating produced water using biochar sourced from wood waste is a two-fold solution to environmental problems as it reduces the volume of these wastes. Batch adsorption tests were carried out to obtain adsorption capacities of each biochar sample using sodium sulphate solutions. The highest sulphur adsorption capacities obtained for hardwood char, softwood char and bark char were 11.81 mg/g, 9.44 mg/g, and 7.94 mg/g respectively at 10 °C and pH=4. The adsorption process followed the second order kinetic model and the Freundlich isotherm model. Adsorption reaction was thermodynamically favourable and exothermic. The overall analysis concludes that the wood biochar is a feasible, economical, and environmental adsorbent for removal of sulphate from produced water.

Student Independent Projects Environmental Studies 2007: Redesigning the Corner Brook Waterfront

In recent decades, urban planning has seen a rise in waterfront revitalization. This is important concerning Corner Brook, where the possible permanent closure of the Mill would have devastating consequences for the surrounding area. Corner Brook is located on the West Coast of Newfoundland, Canada, and has a population of 20,083 (WWW.statcan.ca, 2007). Corner Brook Pulp and Paper Ltd. (CBP&P) dominates the local economy and is located on the city's waterfront. With the realization that the heart of any city is the waterfront, if there is one present, many cities started revitalization trend in order to bring life back to the community and restore the local economy (Robertson, 1999). In the past, waterfronts were dominated with industry, shipping, and the navy. Today, the focus has shifted to leisure, recreation, tourism, and residential and commercial activity. Along with economic factors, the visual aspect of the waterfront is also Important (Albrecht, Bode, & Evers, 2003; Hoffman, 1999). Although this trend started out larger cities, such as Toronto, it has now spread to smaller centers, similar to the size of Corner Brook (Hoyle, 2000). What differs between the various sizes of the cities is what the main focus of the waterfront will be following the revitalization. With the tourism economy making a strong foothold in Newfoundland, the waterfront would provide the possibility to extend it even further. Yet, the most important aspects of the new waterfront will be to ensure environmentally safe measures (Slocombe, 1993) and making sure that as many jobs as possible will be generated. The generation of new jobs is especially important considering the loss of the Mill, which has provided the city and surrounding area with paying employment.