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Abstract
In this study, the biological characteristics of a microorganisms immobilization media composed of polyvinyl alcohol (PVA) and polyethylene glycol (PEG) were investigated. Scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), live/dead cell analysis, respiration rate measurement, and microbial mass analysis confirmed greater biomass compared to the conventional biological treatment process. The MLVSS curve revealed 2,128 mg/L and 4,626 mg/L immobilized nitrifying and denitrifying microorganisms, respectively. The specific nitrification rate was at 0.0024 mg NH4+-N / mg mixed liquor volatile suspended solids (MLVSS)/hr. The specific denitrification rate was at 0.0052 mg NO3--N / mg MLVSS/hr. Thus, the nitrification and denitrification rates were higher when using the microorganisms immobilization media compared to the conventional methods. Based on the results related to CN−, which is one of the famous toxic materials, the microorganisms immobilization media was twice stronger than that of the activated sludge generated via the A2O(anaerobic /anoxic/oxic) process.
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