ABSTRACT:This study presents an evaluation of a pilot multistage filtration system (MSF) with different dosages, 131 mg L -1 and 106 mg L -1 , of the natural coagulant extracted from Moringa oleifera seeds in pre-filtration and slow filtration stages, respectively. The system was comprised by a dynamic pre-filter unit, two upflow filters in parallel and four slow filters in parallel, and in one of the four filters had the filter media altered. The performance of the system was evaluated by monitoring some water quality parameters such as: turbidity, apparent color and slow filter load loss. The stages that have received the coagulant solution had better treatment efficiency compared with the steps without it. However, the direct application of the coagulant solution in the slow filter caused rapid clogging of the non-woven blanket and shorter career length.KEYWORDS: multistage filtration system, slow filtration, water coagulation.
TRATAMENTO DE ÁGUA PARA ABASTECIMENTO PELO SISTEMA FILME COM EXTRATO DE SEMENTES DE Moringa oleifera
RESUMO:O trabalho apresenta uma avaliação do sistema-piloto de filtração em múltiplas etapas, com aplicação de diferentes dosagens (131 mg L -1 e 106 mg L -1 ) do coagulante natural extraído de sementes de Moringa oleifera, nas etapas de pré-filtração e filtração lenta, respectivamente. O sistema foi constituído por uma unidade de pré-filtro dinâmico, duas unidades de pré-filtros de fluxo ascendente em paralelo e quatro unidades de filtros lentos em paralelo, sendo que, em um dos filtros lentos, houve variação do meio filtrante. O desempenho do sistema foi avaliado por meio de parâmetros como turbidez, cor aparente e perda de carga dos filtros lentos. As etapas que receberam a solução coagulante tiveram maior eficiência de tratamento se comparadas com as etapas sem o recebimento da mesma. Entretanto, a aplicação direta da suspensão coagulante no filtro lento causou rápida colmatação da manta e menor tempo de duração da carreira.
PALAVRAS-CHAVE:filtração em múltiplas etapas, filtração lenta, coagulação da água.
Abstract-In this paper, we present the results of Cu (II) and Cd (II) removal by alginate immobilized Moringa oleifera beads. The beads were separated in two fractions, dried and soaked ones. Equilibrium and kinetic experiments were conducted to determine maximum adsorption capacity under various experimental conditions. A sorption capacity of 67.0 mg.g -1 was obtained using 10 units of dried beads on 20 mg.L -1 Cu (II) and of 60.0 mg.g -1 was obtained using 15 units of dried beads on 23 mg.L -1 Cd (II). In conclusion, alginated -Moringa oleifera beads show to be an efficient adsorbent on aquatic system, with more than 90% of efficiency of removal. And biosorbent regeneration demonstrated to be efficient and maintained its adsorption capacity for seven cycles.
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