Anaerobic biodegradation of RDX and HMX with different co-substrates  

RDX与HMX在不同共基质下的厌氧生物降解（英文）

作　　者：刘宗宽 张磊 刘永红 贺延龄 

机构地区：[1]Department of Environmental Science and Technology, School of Human Settlements and Civil Engineering, Xi'an Jiaotong University [2]Department of Chemical Engineering, Xi'an Jiaotong University [3]Department of Environmental and Chemical Engineering, Xi'an Polytechnic University

出　　处：《Chinese Journal of Chemical Engineering》2015年第4期704-709,共6页中国化学工程学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China(2117619);Major Project of Innovation of Science and Technology of Shaanxi Province(2011KTZB03-03-01)

摘　　要：Simulated wastewater of hexahydro-l,3,5-trinitro-l,3,5-triazine （RDX） and octahydro- 1,3,5,7-tetranitro- 1,3,5,7- tetrazocine （HMX） was treated under anaerobic conditions with co-substrates such as ammonium chloride, dex- trose, sodium acetic, sodium nitrate and sulfate. The results showed that with nitrogen compounds such as ammonium chloride added as co-substrate, no significant change was observed, indicating that the molar ratio of N/C for RDX and HMX is sufficient for biodegradation. With the addition of dextrose and acetate to the system, biodegradation efficiency was enhanced greatly. For example, with dextrose as the co-substrate, degradation efficiency of 99.1% and 98.5% was achieved for RDX and HMX, respectively, after treatment for 7 days. When so- dium acetic was used as the co-substrate, the enhancement of degradation percentage was similar, but was not as high as that with dextrose, indicating the selectivity of RDX and HMX to co-substrate during anaerobic degrada- tion. With sodium nitrate as the co-substrate, the degradation efficiency of RDX or HMX decreased with the increase of salt concentration. Sodium sulfate has no significant effect on the biodegradation of RDX and HMX. A well-selected co-substrate should be employed in applications for degradation of RDX and HMX wastewaters.Simulated wastewater of hexahydro-1,3,5-trinitro-1,3,5-triazine(RDX)and octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine(HMX)was treated under anaerobic conditions with co-substrates such as ammonium chloride,dextrose,sodium acetic,sodium nitrate and sulfate.The results showed that with nitrogen compounds such as ammonium chloride added as co-substrate,no significant change was observed,indicating that the molar ratio of N/C for RDX and HMX is sufficient for biodegradation.With the addition of dextrose and acetate to the system,biodegradation efficiency was enhanced greatly.For example,with dextrose as the co-substrate,degradation efficiency of 99.1%and 98.5%was achieved for RDX and HMX,respectively,after treatment for 7 days.When sodium acetic was used as the co-substrate,the enhancement of degradation percentage was similar,but was not as high as that with dextrose,indicating the selectivity of RDX and HMX to co-substrate during anaerobic degradation.With sodium nitrate as the co-substrate,the degradation efficiency of RDX or HMX decreased with the increase of salt concentration.Sodium sulfate has no significant effect on the biodegradation of RDX and HMX.A well-selected co-substrate should be employed in applications for degradation of RDX and HMX wastewaters.

关 键 词：Anaerobic biodegradationCo-substrateOctahydro-1 3 5 7-tetTanitro-1 3 5 7-tetrazocineHexahydro-1 3 5-trinitro-1 3 5-triazineWastewater 

分 类 号：X17[环境科学与工程—环境科学] X703