厌氧折流板反应器处理退浆废水的启动研究

Start-up of the anaerobic baffled reactor for treating desizing wastewater

对采用厌氧折流板反应器(ABR)处理难降解退浆废水的启动过程进行了研究。实验结果表明:经过90d的运行,反应器在32～34℃、上流速度8m/h、水力停留时间6d、COD容积负荷1.80kg/(m3.d)的条件下,COD去除率达到55%以上,启动成功。出水COD稳定在4500mg/L左右,碱度约为700～850mg/L。运行情况表明,启动初期反应器各隔室的pH变化较大,有效控制pH是系统启动成功的关键。启动后期,各隔室pH稳定在6.8～7.3之间,挥发性脂肪酸(VFA)质量浓度为300～500mg/L。随着隔室的横向推移,污泥的SS、VSS和SS/VSS不断增大,推测反应器中厌氧微生物相分离现象显著。

The start-up of anaerobic baffled reactor（ABR） for treating desizing wastewater has been studied. The results show that： after the start-up of the ABR has run for 90 d, and when the reactor is at 32-34 ℃, the upflow velocity is 8 m/h, the hydraulic retention time is 6 d and the volume loading is 1.80 kg/（m3.d）, the COD removal rate is above 55%, the COD of outflow is about 4 500 mg/L, the alkalinity is between 700 mg/L to 850 mg/L. The running situation indicates that since the pH of each compartment at the early days of the start-up varies greatly, to control the pH efficiently is an important key of the start-up. At the latter days of the start-up, the pH of each compartment keeps stably from 6.8 to 7,3, and the concentration of volatile fatty acid （VFA） is from 500 mg/L to 500 mg/L. Along with the transverse process of compartments, the SS, VSS and SS/VSS of sludge grow greatly, it is predicted that anaerobic microorganism phases in the ABR has been separated distinctly.