According to national statistical data, only 10% of the Brazilian urban pop
ulation have their sewage treated. In the rural areas, where people usually
treat sewage trough septic tank systems, this value is not greater than 5%
. This situation, therefore, depicts a lack of basic sanitation in Brazil,
which, in turn, is responsible for the utilisation of individual systems fo
r the treatment of sewage by more than 100 million people. Generally, soils
and water rivers are, no longer, the last fate for the discharged effluent
s. Wetland system for the treatment of domestic sewage have been employed i
n different situations and arrangements (combined system) always showing ou
tstanding performances.
The reasons which qualify this system for the treatment of effluents have b
een attributed to its low cost, easy maintenance and operation.
The experiment was carried out in the Agriculture Secretary's Training Cent
er, Santa Catarina State, responsible for servicing approximately 66 people
daily, and was fed with local effluent.
This work assesses the efficacy of such a kind of system which is composed
of a septic tank followed by the root zone, in the treatment of liquid effl
uents. (C) 1999 IAWQ Published by Elsevier Science Ltd. All rights reserved
.