Study on the Effect of Biological Reductive Dechlorination of 2,4-Dichlorophenol by Zero-valent Iron

Abstract:

A batch laboratory test was conducted to examine the effect of biological reductive dechlorination of 2,4-Dichlorophenol(2,4-DCP) by the addition of zero-valent iron(Fe0) in the anaerobic system, through inoculating the anaerobic mixed microorganism acclimated for two months. Meanwhile, several factors that affected “Fe0+ microbe” system were also being discussed. The results showed that, “Fe0+ microbe” system accelerated the biological dechlorination of 2,4-DCP effectively compared to the individual use. The optimum quantity of added Fe0 and inoculation was 0.5 g/L and 376.2 mgVSS/L in the combined system respectively. It showed the most effective transformation efficiency for 2,4-DCP when initial pH=8.0, whereas it become weaker when initial pH are keeping in acid condition. There existed a proportion between quantity of added Fe0 and inoculation. It enhanced degradable effect of 2,4-dichlorophenol when increased the quantity of inoculation at suitable ranges, which generated more enzyme or enzymatic series degraded pollutant.

Key words:2,4-Dichlorophenol, Zero-valent Iron, Biological reductive dechlorination