活性炭促进UASB处理高浓度啤酒废水效果研究

Study on treatment effect of high concentration beer astewater by UASB under promotion of activated carbon

高浓度啤酒废水在厌氧消化过程中容易酸化,抑制甲烷转化。为提高UASB反应器的稳定性和处理效果,本研究通过序批式试验的方法,以模拟啤酒废水为底物,考察了两种不同粒径的活性炭对加速UASB污泥颗粒化进程和提高甲烷产率的影响。试验运行95 d,进水有机负荷从2.9 kg/(m3·d)增加到12.0 kg/(m3·d),监测反应器内产气量、出水VFA、出水TOC及污泥特性等参数的变化趋势。结果表明:投加活性炭能有效缩短厌氧污泥颗粒化的时间,增强产甲烷菌活性,大幅提升甲烷产量,出水TOC和VFA都维持在较低水平;并且较小粒径的粉末活性炭对UASB反应器的促进作用优于较大粒径的颗粒活性炭,能有效促进底物向甲烷气体转化。

High concentration brewery wastewater in anaerobic digestion process is easy to lead to acidification and inhibits the conversion of methane. In order to improve the stability and treatment effect of reactor,the paper used the method of sequencing batch test and took synthetic brewery wastewater as the substrate to investigate the effect of different sizes of activated carbon particles on accelerating UASB sludge process and increasing methane production rate. The reactor operated for 95 days in sequencing batch mode. The influent organic loading increased from 2. 9 to 12 kg /( m3·d). The change trend of gas output,VFA,TOC and sludge characteristics in reactor was measured. The results showed that the addition of activated carbon can effectively shorten the time of anaerobic sludge granulation,increase the activity of methanogenic bacteria and improve methane output greatly. TOC and VFA of effluent maintain at a lower level. Furthermore,the powdered activated carbon of less size particles has better promotion effect on UASB reactor than that of granular active carbon and can promote the conversion of methane gas.