Effects of Natural Organic Matter and Heavy Metals on the Degradation of Dicofol by Laccase in a Membrane Bioreactor

• Main Author: Karnika Ratanapongleka
• Format: Article
• Language: Thai
• Published: Mahasarakham University 2019-12-01
• Series: Warasan Witthayasat Lae Theknoloyi Mahawitthayalai Mahasarakham
• Subjects: dicofol; laccase; membrane bioreactor; natural organic matter; heavy metals
• Online Access: http://journal.msu.ac.th/upload/articles/article2562_74170.pdf

The objective of this research was to investigate dicofol removal by laccase from Lentinus polychrous Lev. in a membrane bioreactor with addition of natural organic matter (NOM) and heavy metals solutions (iron and manganese) at concentration 0-50 mg/l, dicofol concentration 1 mg/l, laccase concentration 4.32 U/ml, pH 7 and temperature at 28±3 ºC. Based on the results of the dicofol removal efficiency in the membrane bioreactor system at 240 minutes, it was found that increasing the concentration of natural organic matter and iron solution caused a decrease in removal efficiency. At maximum NOM or iron concentrations of 50 mg/l the dicofol removal efficiency was only 72 and 83%, respectively. Increasing the concentration of manganese, increased the efficiency of dicofol removal. The efficiency of dicofol removal was 100% at all manganese concentration and the efficiency of dicofol removal in the membrane bioreactor was not less than 80% at 480 minutes in all conditions. This study indicates a good potential for application of laccase for dicofol removal in a membrane bioreactor.