微氧水解酸化工艺处理高浓度抗生素废水

试验研究了高浓度难生物降解抗生素废水微氧水解酸化效果.结果表明,微氧环境提高了兼性水解酸化菌的生理代谢功能,曝气搅拌改善了水力条件,在最短HRT为10h ,最大OLR为20kg/(m³·d)条件下,酸化率为58.64%,出水VFA为4825mg/L ,极大地改善了废水的生物降解性能,BOD₅/COD升高了17%左右,为后续好氧生物处理提供了良好的基质准备.在进水水质波动较大的情况下,出水水质相对稳定,出水COD和SS浓度分别为7000～8000mg/L和150～300mg/L ,COD和SS去除率分别为15%～30%和90%～95%.出水VFA的变化滞后于酸化率的变化,酸化率能更好地表征水解酸化系统的效果.反应器底部的污泥床层是VFA生成的主要反应区,随着OLR的升高,达到稳定VFA浓度的反应器高度逐渐增加.填料区功能主要在于截留出水中的SS.污泥以粒径为0.5～1.0mm之间的小颗粒污泥和絮状污泥为主.

Treating High Strength Antibiotic Wastewater by Micro-Aerobic Hydrolysis and Acidification Process

The effect of micro-aerobic hydrolysis and acidification to high strength antibiotic wastewater treatment is studied. The results demonstrate that micro oxygen enhanced the physiological metabolizability of facultative hydrolytic and acidogenic bacteria, and aerating stirring improved the hydraulic condition. Degree of acidification (AD) and volatile fatty acid (VFA) in the effluent reached 58.64% and 4825 mg/L with the shortest HRT 10 h and the maximal OLR 20 kg/(m3 x d), respectively. Wastewater biodegradability was improved greatly and rising BOD5/COD was about 17%, which offered good substrate for post aerobic treatment. The effluent quality was relative stable with the fluctuant influent, and COD and SS were 7000-8000 mg/L and 150-300 mg/L, respectively, while the removal efficiencies of COD and SS were 15%-30% and 90%-95%. The changement of VFA lagged behind that of AD in the effluent, and AD would represent the effect of hydrolysis and acidification process more properly. The sludge bed in the bottom of the reactor was the main reaction field for VFA production, and the height of the reactor for stable VFA production increased with the increase of OLR. The filling field mainly aimed to entrap SS in the effluent and benefited little to VFA production. Sludge in the reactor was mainly little sludge particles with the size of 0.5-1.0 mm and flocculent sludge.