电极-SBBR对集中型沼液的脱氮除铜研究

为了处理集中型沼液中过高的氨氮和由饲料添加剂带入的铜,将电极生物膜法与序批式生物膜反应器(SBBR)工艺的优势进行互补,构建电极-SBBR耦合新工艺,以同时去除氮与铜。通过实验室配水与沼液试验,探讨了电极-SBBR体系同步脱氮除铜的工艺参数及其效果。结果表明,集中型沼液电极-SBBR体系的操作工序为:进水→厌氧→曝气→缺氧/厌氧→出水→闲置,运行参数为:水力停留时间7.0h,厌氧0.5h、曝气4.0h、缺氧/厌氧2.5h;电流30～60mA,溶解氧(DO)4.0～5.0mg/L,碳氮比(C/N)>10.0。电极-SBBR体系对沼液中全氮(TN)、Cu2+、化学耗氧量(COD)的去除率分别达到45.79%、86.53%和84.86%,可以作为沼液脱氮除铜的新工艺。

Synchronous removal of nitrogen and copper from biogas slurry by electrode-SBBR

For consideration of excessive ammonia nitrogen (NH4+-N) in concentrated biogas slurry,and copper (Cu2+) caused by additions of feed additives,a new system of electrode-sequencing batch biofilm reactor (SBBR) technique was constructed for simultaneously removing the NH4+-N and copper in concentrated biogas slurry,through integrating the advantages of two methods including electrode-biofilm and SBBR.Meanwhile,through simulated wastewater and biogas slurry,the both of pertinent parameters and effects of electrode-SBBR were also investigated.The results showed that the operating process of this technique was:adding water → anaerobic processing → aeration → anoxic or anaerobic processing → effluent dewatering → idle.The optimal conditions were suggested as follows:hydraulic retention time (HRT) was 7.0 h,anaerobic and aeration time was 0.5 h and 4.0 h respectively,and anoxia /anaerobic time was 2.5 h,furthermore,electric current ranged 30-60 mA,DO was 4.0-5.0 mg/L and C/N ratio was greater than 10.0.In summary,the removing efficiencies of total nitrogen,Cu2+ and COD from the biogas slurry could reach to 45.79%,86.53% and 84.86% respectively by the electrode-SBBR system.The results indicate that the electrode-SBBR system can be considered as a new technique for removal of nitrogen and copper from the biogas slurry simultaneously.