TITLE:
Influence of Constructed Wetland and Soil Filter Systems in the Dynamics of Phytoplankton Functional Groups of Two Subtropical Fish Farm Wastewaters
AUTHORS:
Rodrigo N. Millan, Lúcia H. Sipaúba-Tavares, Fernanda Travaini-Lima
KEYWORDS:
Wastewater Treatment; Microalgae; Removal Efficiency; Functional Groups
JOURNAL NAME:
Journal of Water Resource and Protection,
Vol.6 No.1,
January
15,
2014
ABSTRACT:
Environmental pressure, land utilization, and economic
feasibility have resulted in the development of alternatives to treatment fish
farm wastewater. We examined the influence of two water treatment systems—a constructed
wetland (CW) and a soil filter system (SF)—on the constitution of the
phytoplankton community analyzed through the functional grouping of species and
nutrients removal of aquaculture farm. The CW provided high removal efficiency:
82.9% for ammonia, 87.0% for nitrate, 96.9% for nitrite, 85.5% for total
phosphorus, 88.5% for SRP and 71.6% for BOD. Removal efficiency of SF was lower
than CW, removing 82.1% of ammonia, 7.2% of total phosphorus, 45.9% of SRP and
39.4% of nitrite, but was satisfactory. The functional group F, made up of
Chlorophyceae Dictyosphaerium pulchellum and Kirchneriella lunaris, was the
most representative in both systems, followed by functional group P and constituted by Zygnemaphyceae Melosira sp. The number of functional groups decreased in the outlet of the two
treatment systems, where S1, H1 and W1, characteristic of eutrophic
environment, were retained. Data show that CW and the SF system are potentially
applicable to the fish farm wastewater treatment and ensure an improvement in
water quality.