3BER-S工艺用于再生水深度脱氮同步去除PAEs的可行性

Feasibility of 3BER-S Process for the Deep Denitrification in Synch with the Removal of PAEs from Reclaimed Water

为了考察三维电极生物膜硫自养耦合工艺（3BER-S）对再生水进行深度脱氮同步去除邻苯二甲酸酯（PAEs）的可行性,基于3BER-S反应器内已挂膜活性炭填料静态吸附PAEs能力测定和动态反硝化脱氮同步除PAEs运行结果,分析了3BER-S反应器同步脱氮去除PAEs的工艺特性和作用机制.结果表明,挂膜活性炭填料对邻苯二甲酸二丁酯（DBP）、邻苯二甲酸二（2-乙基）己酯（DEHP）的平均吸附去除率分别为85.84%、97.12%,平衡吸附容量为0.142 6mg·g-1、0.162 mg·g-1,达到吸附饱和的时间分别为120 min、60 min;PAEs对3BER-S反硝化系统脱氮效果影响不明显,加入PAEs前后反应器出水TN的浓度在1~2 mg·L-1之间,TN的平均去除率达到了94%以上;3BER-S反硝化系统对PAEs有较强的去除能力,出水中DBP和DEHP的浓度在0~6μg·L-1范围内、去除率均在96%以上;3BER-S对PAEs的去除是吸附、生物降解和电化学协同作用结果.模拟污水厂二级出水经过3BER-S工艺处理后,DBP和DEHP的浓度满足《城市污水再生利用地下水回灌水质标准》（GB/T 19772-2005）所规定的限值.

In order to investigate the feasibility of deep denitrification and simultaneous removing phthalate esters（ PAEs） in the process of reclaimed water treatment uses three-dimensional biofilm-electrode reactor coupled with sulfur autotrophic deep denitrification technology（ 3BER-S）,the technological characteristics and mechanisms were analyzed based on determining the static adsorption capacity of biofilm cultured active carbon fillers in 3BER-S reactor together with the operation results of dynamic denitrification and simultaneous PAEs removing. The results showed that the average adsorption rates of DBP,DEHP were 85. 84% and 97. 12% in the biofilm cultured active carbon fillers,the equilibrium adsorption capacities were 0. 142 6 mg·g- 1and 0. 162 mg·g- 1and the time spans of reaching adsorption saturation were 120 min and 60 min, respectively; The existence of PAEs had no obvious effect on denitrification,the reactor effluent concentration of TN was in range of 1-2 mg·L- 1before and after the addition of PAEs,and the average removal rate of TN reached above 94%; 3BER-S denitrification system showed significant ability in removing PAEs,leading to effluent concentrations of DBP and DEHP of no more than 6 μg·L- 1with removal rates of above 96%; this was due to the synergistic effect of absorption,biodegradation and electrochemistry. After treatment with 3BER-S technology,DBP and DEHP in simulative municipal secondary effluent met the regulated limitation of The Reuse of Urban Recycling Water Quality Standard for Groundwater Recharge（ GB / T 19772-2005）.