有机负荷对厌氧流化床反应器处理模拟味精废水的影响

在中温(35±1℃)条件下,以新型橡胶颗粒为载体的厌氧流化床(AFB)反应器处理模拟味精废水为研究体系,考察有机负荷(OLR)由2.08 kg/(m3.d)提高到19.20 kg/(m3.d)期间,污染物去除率、胞外聚合物(EPS)含量及其在生物膜和混合液中的分布、生物膜中MLVSS含量及脱氢酶活性等的变化情况。结果表明,随有机负荷增加,污染物去除稳定,COD去除率维持在80%左右;EPS在生物膜中的量大于在混合液中的量,并以蛋白质为主要成分,但其总量呈递减趋势;当有机负荷为19.20 kg/(m3.d)时,生物膜中MLVSS含量约为23.1 mg/g载体,脱氢酶活性则为22.6 mg/(L.h);载体生物膜的生物相以独缩虫属、聚缩虫属、累枝虫属和钟虫等为主。

Effect of organic loading on treatment efficiency of synthetic monosodium glutamate wastewater by anaerobic fluidized bed reactor

The treatment efficiency of synthetic monosodium glutamate wastewater,under the mesophilic condition(35±1 ℃) by the anaerobic fIuidized bed reactor(AFB)with a novel carrier made of rubber particles,was investigated.The variations in pollutant removals,the contents of extracellular polymeric substances(EPS) and its distribution in biofilm and mixed liquor,MLVSS in biofilm and the dehydrogenase activity were studied,respectively,when the organic loading(OLR) increased from 2.08 kg/(m3·d) to 19.20 kg/(m3·d).The results showed that,with the increase in OLR of AFB,the COD removal kept steady at about 80%.EPS content in biofilm was higher than those in mixed liquor,but its total amount decreased with the increase in OLR.Proteins were its dominating components.When the OLR amounted to 19.20 kg/(m3·d),MLVSS in the biofilm and dehydrogenase activity were 23.1 mg/g carrier and 22.6 mg/(L·h),respectively.Carchesium,Zoothamnium,Genus Epistylis and Vorticella were dominating the microbial biofilm.