生物反应器填埋场中邻苯二甲酸二丁酯的迁移转化

基于填埋垃圾和渗滤液这一整体系统,以传统卫生填埋场(CL)为对照,研究了模拟回灌型生物反应器填埋场(RL)和两相型生物反应器填埋场(BL)中邻苯二甲酸二丁酯(DBP)的迁移转化特征.结果表明,实际垃圾填埋的CL、RL和BL垃圾及渗滤液均检测到DBP,其中垃圾中DBP的初始含量约为18.5μg.g-1.各填埋场的稳定化进程顺序为BL>RL>CL,稳定化进程影响着DBP在垃圾中的降解行为,相比于填埋场产酸期,填埋场产甲烷期时的环境条件更有利于DBP的降解.至实验结束(310 d),CL、RL和BL垃圾沉降率分别为7.0%、11.9%和24.3%,垃圾中DBP的残留含量分别约为2.1、1.3和0.8μg.g-1,DBP去除率分别约为89.5%、93.9%和96.6%.DBP残留总量变化符合指数衰减模型,实验后期不同运行工艺的填埋场中DBP残留总量差异显著,渗滤液回流明显加速了DBP的生物降解,而产甲烷反应器的引入更能促进DBP在填埋场中的去除.

Transformation of Dibutyl Phthalate in Bioreactor Landfill

Considering the refuse and leachate as one whole system, a conventional landfill (CL) was set as a control, transformation of dibutyl phthalate (DBP) in recirculated landfill (RL) and bioreactor landfill (BL) was studied. Results showed that DBP was detected in both leachate and refuse from CL, RL and BL. The initial DBP amount was 18.5 microg x g(-1) in the landfill refuse. In addition, the stabilization process of landfill, with sequences of BL > RL > CL, played an important role on the biodegradation of DBP in refuse. Compared to the acidic environment, the methanogenic environment was beneficial for DBP degradation. At the day of 310, refuse sedimentation rates were 7.0%, 11.9% and 24.3% in CL, RL and BL, respectively. DBP residual amounts were 2.1, 1.3 and 0.8 microg x g(-1), and its removal rates were 89.5%, 93.9% and 96.6% in the refuse from CL, RL and BL, respectively. The residual amounts of DBP with significant differences well fitted exponential decay models in CL, RL and BL. Finally, DBP biodegradation was obviously accelerated with the operation of leachate recirculation compared to the conventional operation, and it was further promoted with the introduction of methanogenic reactor.