双氧水协同生化法强化处理印染废水

传统生化法对印染废水的处理有一定的局限性.本文研究了双氧水协同水解酸化-接触氧化系统,对印染废水进行强化处理.采用污泥挂膜、生化系统启动、双氧水协同启动的方法,将双氧水投加到水解酸化时的条件严格控制为:投加3m L·L~(-1)、投加量100.0 m L、流速0.67 m L·min-1、投加频率1次·d-1,可使整个系统成功启动与稳定运行.实验结果表明,双氧水协同水解酸化-接触氧化可对印染废水中的特征污染物进行有效强化处理.其中,COD平均去除率为89.8%,氨氮平均去除率为96.7%,PVA平均去除率为87.4%,废水平均脱色率为92.1%.采用16S rDNA宏基因组高通量测序技术,对比分析了接种种泥、水解酸化污泥和接触氧化污泥微生物的群落结构.结果表明,经过驯化,水解酸化和接触氧化微生物群落均发现了显著变化.其中,水解酸化污泥优势菌门主要为变形菌门Proteobacteria、拟杆菌门Bacteroidetes和疣微菌门Verrucomicrobia;接触氧化污泥优势菌门主要为浮霉菌门Planctomycetes、变形菌门Proteobacteria和酸杆菌门Acidobacteria.该实验从宏观和微观角度,均证实双氧水协同生化法强化处理印染废水具有技术可行性.

Enhanced Treatment of Printing and Dyeing Wastewater Using H2O2-Biochemical Method

The traditional biochemical treatment of printing and dyeing wastewater has limited efficiency. This study investigated whether H₂O₂ could strengthen the biological ability of the hydrolytic acidification/biological contact oxidation process (A/O), which effectively treats the printing and dyeing wastewater. After biofilm formation and the biochemical system startup and operation by H₂O₂, the system was successfully started and steadily operated when H₂O₂was added into reactor A with the H₂O₂ voluve fraction of 3 mL·L^-1, doses of 100.0 mL, the flow velocity of 0.67 mL·min^-1, and dosing frequency of once a day. The experimental results showed that the average removal efficiencies of COD, ammonia nitrogen, PVA, and color of printing and dyeing wastewater were 89.8%, 96.7%, 87.4%, and 92.1%, respectively. The microorganism community structures of reactor A and reactor O in this system were analyzed by high-throughput sequencing of 16S rDNA amplicon. The results demonstrated that the three dominant microbial strains in reactor A were Proteobacteria, Bacteroidetes, and Verrucomicrobia, and in reactor O were Planctomycetes, Proteobacteria, and Acidobacteria.