Variation of Species Diversity, Density of Phytoplankton and Water Qualities in Community Wastewater Treatment System at The King’s Royally Initiated Laem Phak Bia Environmental Research and Development Project, Phetchaburi Province
Abstract
The objective of this research was to study the relationship between water quality and phytoplankton diversity and abundance at The King’s Royally Initiated Laem Phak Bia Environmental Research and Development Project, Phetchaburi Province (Thailand). Samples were collected from 5 ponds (sedimentation pond, oxidation pond 1, oxidation pond 2, oxidation pond 3 and stabilization pond) during winter (December 2014 – February 2015) and rainy season (August – October 2015). Both seasons, pH and dissolved oxygen (DO) was gradually increase when they passed to wastewater treatment , whereas biochemical oxygen demand (BOD), suspended solids (SS), orthophosphates (PO43-), total phosphorus (TP), ammonium ion (NH4+), nitrate ion (NO3-) and total nitrogen (TN) was decrease when they passed to wastewater treatment. In winter season, phytoplankton diversity was non-significant difference (p>0.05) among ponds, while phytoplankton diversity in sedimentation pond was significant difference (p<0.05) in rainy season. The abundance of phytoplankton were non-significant different (p>0.05) among ponds in both seasons. Dominant species were Spirulina (Division Cyanophyta, Class Cyanophyceae (Blue-Green Algae)) and Chlorella (Division Chlorophyta, Class Chlorophyceae (Green Algae)) consistented with nutrients in wastewater treatment system.
Keywords: phytoplankton, community wastewater treatment, Phetchaburi
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