Tratamento de esgoto sanitario em reator anaerobio preenchido por casca de coco verde (Cocos nucifera) combinado com filtro de areia / Wastewater treatment through an anaeroboc filter filled up with coco nuts (cocos nucifera) combined with sand filter

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

The development of efficient wastewater treatment systems, which are also adapted to the economic and structural conditions of a village, would be an option to decrease the lack of water problem since the effluent could be reused or discharged into receiving waters. Moreover, with wastewater system, health and environmental problems would be less frequent. For this reason, the aim of this investigation was to study a wastewater treatment system for small villages constituted by the combination of upflow anaerobic filters followed by sand filters. The performance of two upflow anaerobic reactors filled with coco nuts (Cocos nucifera) and four sand filters (0.75m deep) was evaluated. The anaerobic filters staring up were different since one of them was inoculated. The hydraulic retention time (HRT), which was studied, varied from 12 to 3 hours. On the four sand filters, the anaerobic effluent was disposed in different frequencies of application (300, 400, 500 and 600 Lm-2dia-1) in order to estipulate the diary application limit capacity to keep the effluent quality according to Brazilian laws, like CONAMA 357. To evaluate the anaerobic reactors, the support and the frequency of application on the sand filters, weekly, sewage, anaerobic and final effluent were analyzed through physical, chemical and biological parameters, according to Standard Methods for the Examination of Water and Wastewater. Anaerobic reactors were stable even when HRT was modified and organic material removing was around 64% showing that the coco nuts can be used as a support. The sand filters could remove about 80% of organic matter and TSS and, approximately, 100% of turbidity. Besides, these filters showed a great capacity of aeration and nitrification producing an effluent with 82% of nitrate concentration from the total nitrogen concentration. As the results were satisfactory, it can be confirmed the possible higher frequencies of application in sand filters

ASSUNTO(S)

esgotos - tratamento nitrification wastewater treatment coconuts coco nitrificação

ACESSO AO ARTIGO

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