摘要
为解决载体內部微孔孔径在废水生物膜法中缺乏选型依据的问题,采用5种孔径(0.6~4 mm)聚氨酯海绵生物载体构建了SBBR,考察了载体内微孔孔径对生物膜特性(MLSS、EPS、DHA)及废水处理效果的影响,分析了载体内部微孔孔径与生物膜特性的相关性。结果表明:载体内微孔孔径与MLVSS、MLSS呈显著负相关,而与PN、PS、EPS和f呈显著正相关;高生物量使小孔径载体(0.6 mm,1 mm)在反应器运行前中期拥有最佳的废水处理效果,同时过多的生物膜在微孔环境中会堵塞内部的通道和空穴,进而抑制传质,使生物膜活性(DHA、f)降低;而大孔径载体(4 mm)内部传质快、水力剪切作用强,加速生物膜解吸脱落速率,促进了生物膜活性的提高与EPS(主要是TB-EPS)的释放,但同样限制了生物膜量的增长。相较而言,中等孔径载体(2 mm,3 mm)适宜的微孔不仅能维持适量的微生物量,还能保持良好的生物膜结构和活性,为生物膜反应器提供良好的长期运行条件和处理效果。
In order to improve the lack of selection basis of micropore size of the carrier of wastewater biofilm process,polyurethane sponge carrier with 5 micropore diameters(0.6~4 mm)were used to build five laboratoryscale sequencing batch biofilm reactors(SBBR).The effect of the micropore diameter of the carrier on the biofilm characteristics(biomass,EPS and DHA)and wastewater treatment performance was investigated.The relationship between the micropore diameter of the carrier and the biofilm characteristics was analyzed.The results showed that the micropore diameter of the carrier was negatively correlated with MLVSS and MLSS,but positively correlated with PN,PS,EPS and f.During the early and middle periods of SBBR operation,high biomass led to the best wastewater treatment effect by the small-pore carrier(0.6 mm,1 mm),and meanwhile too much biofilm blocked the internal channels and holes in the microporous environment,thus inhibited the mass transfer,and reduced the biofilm activity(DHA,f).However,for the large-pore carrier(4 mm),the mass transfer was fast and the hydraulic shear was strong,which accelerated the desorption and detaching rate of biofilm,promoted the biofilm activity and the EPS release(mainly TB-EPS),but limited the growth of biofilm biomass.Comparatively,the appropriate micropore in medium-pore carrier(2 mm,3 mm)could not only maintain the appropriate microbial biomass,but also ensure an excellent biofilm structure and activity,providing good long-term operating conditions and treatment performance.
作者
胡小兵
林睿
张琳
汪坤
何楠婷
顾娴静
沈翼军
HU Xiaobing;LIN Rui;ZHANG Lin;WANG Kun;HE Nanting;GU Xianjing;SHEN Yijun(College of Architectural Engineering,Anhui University of Technology,Ma′anshan 243032,China;Engineering Research Center of Water Purification and Utilization Technology Based on Biofilm Process,Ministry of Education,Ma′anshan 243032,China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2020年第12期3329-3338,共10页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金资助项目(51878001)
安徽省重点研究与开发计划标准化专项(202004h07020027)。
关键词
微孔孔径
生物膜量
胞外聚合物
脱氢酶活性
废水处理效果
microporous diameter
biofilm biomass
extracellular polymeric substances
dehydrogenase activity
wastewater treatment performance
