Tratamento de efluentes de indústria de beneficiamento de coco

Abstract

The food industry is a sector that has worldwide prominence. Each day, increase the population’s needs and with them the amount of wastewater needing treatment for release into the environment. For this, new technologies have been studied with the purpose to keep the liquid waste to the standards of the requirements of the legislation, of more efficient and economic form. In the coconut industry, the solid waste generated is reused as fuel for the industry itself, and its liquid waste are mostly derived from the industrialization process and rinse water, rich in suspended solids, oils and fats. This study aimed to compare the performance of the induced air flotation and filtration after coagulation of effluent processing of coconut. To this end, we used a synthetic effluent consisting of water and coconut milk to 1% v/v and studied the coagulant and the conditions of flocculation. The coagulants were studied: aluminum sulfate, aluminum polychloride, ferric sulphate, and ferric chloride. The process performance was evaluated through analysis of Chemical Oxygen Demand (COD) and Content Oils and Grease (COG), since these parameters have limits on federal and state legislation for disposal of effluent in receiving waters. The coagulant that the best performance in the clarification of the effluent was the ferric sulphate. The filtration was more efficient than the induced air flotation treatment of the synthetic industrial processing of coconut. The filtration tests that showed better results regarding the reduction of COD were achieved with greater range of particle size of sand (1.00-0.84 mm) and in the reduction of TOG, tests with the sand with a lower range of particle size (0.59-0.42 mm) .