爆炸物污染土壤中2，4-DNT和2，6-DNT的生物降解中试研究

设计采用包括土壤生物降解、反硝化以及循环混合系统构成的中试流程,模拟原位生物修复工艺,依靠污染土壤自身的生物降解过程去除2,4-二硝基甲苯(2,4-DNT) 和2,6-二硝基甲苯(2,6-DNT).结果表明,即使在温度较低的条件下（8～15℃）,2,4-DNT 和2,6-DNT仍可以被完全去除.两者虽然属于同分异构体,但前者的生物降解速率大大高于后者.系统可以维持自身的碱度平衡和保证无机营养供应,无需调节或补充;反硝化能够正常进行,从而防止亚硝酸根在系统内积累抑制DNT生物降解,但要彻底去除亚硝酸根及硝酸根,需要外加碳源.

Biodegradation of 2,4- and 2,6-Dinitrotoluene in a Pilot-Scale System for Soil Contaminated with Explosive Compounds

A pilot-scale system consisting of a soil biodegradation tank, a denitrification tank, and a recirculating feeding tank was designed and applied to study the biodegradation of 2,4- and 2,6-dinitrotoluene in soil contaminated with the explosives. The experimental results showed that 2,4- and 2,6-DNT can be degraded completely by native DNT degrading bacteria existing in the contaminated soil, despite water temperatures as low as 8°C. to 15 °C. Compared to 2,4-DNT, the biodegradation of 2,6-DNT was much slower and took much longer time. The alkalinity and nutrient needs of the bacteria were supplied by the soil with no additional amendments required. The denitrification system played an important role in preventing nitrite inhibition of DNT biodegradation, but it was necessary to supply an additional carbon source to ensure complete nitrite removal.