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This study evaluated a continuous flow system using rice husk ash as an adsorbent to treat textile bath dyeing residual. The system consisted in recirculating the effluent in a burette containing the adsorbent. This procedure was performed in five cycles of reuse of the adsorbent. Chemical Oxygen Demand and color were determined by the estimate of the adsorbent’s efficiency as a function of time by comparing the cycles of reuse bath dying residual, raw wastewater and wastewater treated with ashes. The maximum efficiency obtained was 91% in the 1st cycle. However, in the 5th cycle the efficiency adsorbent was near 46%.

Determinação do número de ciclos de reuso do adsorvente cinza de casca de arroz no tratamento de um banho residual de tingimento têxtil