连续投加微生物絮凝剂促进厌氧污泥的颗粒化(英文)

Enhancement of Anaerobic Granulation for Sludge by Continuously Adding Bioflocculant*

将升流式厌氧污泥床(UASB)反应器在(35±1)℃下运行102天处理低浓度废水,研究微生物絮凝剂对厌氧污泥颗粒化的影响.结果表明:投加微生物絮凝剂或阳离子PAM(聚丙烯酰胺)对厌氧污泥颗粒化具有促进作用;连续投加微生物絮凝剂的反应器1(R1)运行43天后,容积负荷达3.8 g/(L.d)(以单位容积反应器每天的化学需氧量负荷计),而投加阳离子PAM的反应器2(R2)和对照反应器3(R3)达到同样的容积负荷分别需要44和98天;R1中的颗粒污泥在沉降性能和产甲烷活性方面优于R2中的颗粒污泥;实验结束时,R1,R2和R3的COD去除率分别为94.5%,91.7%和84.0%.

Upflow anaerobic sludge blanket （UASB） reactors were operated at （35 ± 1 ） ℃ for 102 days to reveal the effect of bioflocculant on the anaerobic granulation of sludge during the treatment of low-strength wastewater. The results indicate that the addition of bioflocculant or cationic polyacrylamide （PALM） markedly accelerates the anaerobic granulation, that Reactor 1 （ R1 ） with the addition of bioflocculant is of an organic loading rate （OLR） of 3.8 g/（ L · d） （ calculated as the loading of COD on the reactor per liter per day） in 43 days, while Reactor 2 （R2） with the addition of cationic PAM and the control reactor 3 （ R3 ） reach the same value respectively in 44 and 98 days, that the granules developed in R1 exhibit better settleability and methano- genic activity than those in R2, and that the COD removal efficiencies of R1, R2 and R3 respectively reach 94. 5%, 91.7% and 84.0% when the experiments have been finished.