Khaled Nasserdine, Ziad Mimi , and Blair Bevan
Environmental Management of the stone cutting industry in Hebron, Palestine, is required to reduce the industry's adverse impacts on the downstream agricultural land and on the drinking water aquifers. This situation required the implementation of an industrial wastewater management strategic approach and technology within the environmental need and available technical and financial resources. Ten pilot projects at different locations were built at Hebron to reduce or eliminate the incompatible discharge of the liquid and solid waste to the environment and improve the stone cutting industry's effluent quality A review of existing practices and jar test experiments were used to optimize the water recycling and treatment facilities. The factors reviewed included influent pumping rates and cycles, selection of the optimal coagulant type and addition methods, control of sludge recycling process, control over flow rates, control locations of influent and effluent, and sludge depth. Based on the optimized doses and Turbidity results, it was determined that the use of Fokland polymer with an optimal dose of 1.5 mg/L could achieve the target turbidity levels. The completion of the pilot projects resulted in the elimination of 18% of the total stone cutting waste discharges in Hebron. The results included an improvement in the recycled effluent quality by 44-99%. This in turn reduced the long term operating costs for each participating firm. A full-scale project that will include all the stone cutting firms in Hebron industrial area is required