Abstract
Processes related to self-purification of Thi Nai lagoon has been studied in-situ and in laboratory in rainy season (October, 2013) and in dry season (May, 2014). Studied results shows that the capacity of self-purification of Thi Nai lagoon is quite good in rainy season, and the dominated process is material exchange. In dry season, due to the weak of material exchange, there is the accumulation of pollutants in water body, especial for nitrite, ammonium and phosphate. The studied results also indicate that the main processes that dominate the self-purification of Thi Nai lagoon are materials exchange, sedimentation, dispersion, decompose, and photosynthesis, respectively. The pollution loads discharged everyday into the Thi Nai lagoon is high, reducing the self-purification of lagoon, therefore it need to be controlled restrict.
Highlights
Thi Nai lagoon area located in the coordinate of 109°10’00’’- 109°17’00’’E; 13°45’00’’- 13°56’30’’N, belong to Binh Dinh province, Viet Nam
Studied results shows that the capacity of self-purification of Thi Nai lagoon is quite good in rainy season, and the dominated process is material exchange
This paper presents the study on self-purification of Thi Nai lagoon, contributing in understanding of processes in lagoon, from that finding which process dominates the self-purification of Thi Nai lagoon
Summary
Thi Nai lagoon area located in the coordinate of 109°10’00’’- 109°17’00’’E; 13°45’00’’- 13°56’30’’N, belong to Binh Dinh province, Viet Nam. The removal of pollutants from a water body without any artificial controls is called self-purification, or natural purification (Koichi & Hong, 2002). The mechanism of self-purification of water bodies can be divided into three groups: physical processes, chemical processes and biological processes. Biological processes play the most important role among the mechanisms of self – purification in natural water bodies (Koichi & Hong, 2002). The biological removal of pollutants from a natural water body is usually called “true self-purification” and the total purification by physical, chemical and biological processes is called “apparent self-purification” (Koichi & Hong, 2002). We apply this method to Thi Nai lagoon to assess the self-purification of it. This paper presents the study on self-purification of Thi Nai lagoon, contributing in understanding of processes in lagoon, from that finding which process dominates the self-purification of Thi Nai lagoon
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