| Abstract:Methanogenic toxicity and methanogenic activity recovery experiments in different concentrations of 2,4,6-TCP in the paper-making wastewater were carried out. The results showed that the inhibition of methanogens was positively correlated with the concentration of 2,4,6-TCP, and the recovery of methanogenic activity was negatively correlated. It illustrated that 2,4,6-TCP is a type of fungicides. The effect of different concentrations of 2,4,6-TCP on the characteristics of domestic anaerobic granular sludge was studied. It proved that concentrations of 20 mg/L and 30 mg/L of 2,4,6-TCP promoted sludge granulation and accelerated the formation of large particles, increased the activity of granular sluge, due to the lack of nutrients, it formed a cavity, the sedimentation rate decreased. In the conditions of high concentration (20 mg/L and 30 mg/L) of 2,4,6-TCP, the main metabolic pathway was metabolic reductive dechlorination, so the amount of biomass increased. Furthermore, high concentration 2,4,6-TCP provided sufficient nutrients for reductive dechlorination and anaerobic microorganisms to increase biological activity, and the concentration of coenzyme also increased. In the situations of high concentration (20 mg/L and 30 mg/L) 2,4,6-TCP,bacterial decomposed and permeated to the extracellular, thus the total content of extracellular polymeric substance (EPS) increased. |
