The Study of the Efficiency of Purple Non-Sulfur Photosynthetic Bacteria in Wastewater Treatment Using an SBR System

This study investigates wastewater treatment using an SBR (Sequencing Batch Reactor) system
combined with photosynthetic bacteria at varying bacteria-to-wastewater ratios. The main goal was to
evaluate the efficiency of these bacteria in treating wastewater from Satthasamut School. Experimental
testing at the Pak Lat Reservoir, Thailand, was conducted to observe the efficacy of the treatment system
under three different ratios: 1:60, 1:120, and 1:240. Results showed significant improvements in water
quality across all ratios, with the 1:120 ratio proving to be the most effective. This paper discusses the
effectiveness of photosynthetic bacteria in wastewater treatment, focusing on the effects of bacteria
concentration on water parameters such as pH, dissolved oxygen (DO), and optical density (OD). The
study also highlights the influence of natural factors on treatment efficiency and offers recommendations
for future studies.