两次投加竹炭对UASB反应器污泥颗粒化的促进作用

Effect of two-added powdered bamboo-charcoal on sludge granulation of UASB reactor

为考察竹炭不同投加方式对UASB反应器污泥颗粒化过程的影响,以猪场废水为培养基质,对比分析了试验组(启动初期和颗粒污泥形成后两次投加粉末竹炭)和对照组(仅在启动初期投加1次粉末竹炭)两台UASB反应器中污泥颗粒化过程。结果表明:在颗粒污泥出现后再次投加粉末竹炭可促进颗粒污泥的增殖与稳定,有利于大粒径颗粒污泥的形成和致密化,改善颗粒污泥沉降性能,进而提高有机物去除效果。试验运行至第57天,试验组反应器底部和上部污泥颗粒化程度(SGR)分别为94.5%和60.7%,比对照组分别高出了7.9%和17.3%,其中试验组反应器底部粒径大于1.7mm的颗粒污泥质量分数达到了41.7%,而对照组仅为32.4%;试验组反应器化学需氧量(COD)去除率为81.6%,明显高于对照组(75.7%)。试验结果证明,在UASB污泥颗粒化过程中,于颗粒污泥出现后再次投加粉末竹炭,可加快UASB反应器的启动。

Aimed to investigate the effects of the difference in the addition of powdered Bamboo-Charcoal on the sludge granulation in upflow anaerobic sludge bed（UASB）,two UASB reactors were used to treat piggery wastewater,the sludge granulation and characteristics of granluar sludge were evaluated between the testing group UASB reactor（with two-added powdered Bamboo-Charcoal）and the blank group UASB reactor（with one-added powdered Bamboo-Charcoal）.The results showed that the addtion of powdered bamboo-charcoal could markedly accelerate the anaerobic granulation and facilitate the formation of the large-size granluar sludge after producing the granluar sludge.It could improve the settlement ability of granluar sludge and accordingly increase the COD removal efficiency.On the 57st day,the sludge granulation rate（SGR）from sludges on the bottom and the top of the testing group UASB reactor reached 94.5% and 60.7% respectively,higher than the blank group by 7.9% and 17.3% respectively;The content of granluar sludge（Diameter1.7 mm）of the bottom for the testing group reactor reached 41.7%,while the blank group only 32.4%;The COD removal rates of the testing group and the blank group reached 81.6% and 75.7% respectively.Based on the results of the experiment,the second addition of Bamboo-Charcoal following the apperance of granluar sludge exhibited the ability to enhance sludge granulation process dring start-up.