摘要
投加缓释碳源是降低低碳氮比废水总氮(TN)的有效途径。使用聚己内酯(PCL)、玉米芯(CC)和二价铁盐(FeSO_(4)、FeCl_(2))为电子供体,以聚乙烯醇和海藻酸钠为骨架,经过化学交联制备了PCL-CC基质(PC)、PCL-CC-FeSO_(4)基质(PCF-S)和PCL-CC-FeCl_(2)基质(PCF-C)3种固体缓释碳源,构建了铁-碳协同脱氮除磷的反硝化滤池,并将其用于处理模拟废水,比较了PC、PCF-S和PCF-C在连续流反硝化滤池中的有机物释放特性与其强化脱氮除磷的性能。结果表明:PC、PCF-S和PCF-C 3种基质均可长期稳定释碳达48 d以上;在PCF-C与PCF-S缓释碳源滤池中,铁自养反硝化和异养反硝化之间存在明显的协同作用,2种反硝化作用的结合可显著增强滤池对氮磷的去除效果,3种碳源基质中PC反硝化潜能最好;相较于中低浓度阶段,高浓度进水阶段3种碳源滤池对氮素的去除率均有所下降,脱氮效果变差,这是由于高浓度进水阶段2种PCF基质出现铁壳积累现象,其积累程度由有机物释放速率和脱氮负荷共同决定。
The addition of slow-release carbon source is an effective way to reduce the total nitrogen(TN)in waste-water with lower C/N ratio.In this study,three solid slow-release carbon sources including PCL-CC matrix(PC),PCL-CC-FeSO_(4)matrix(PCF-S)and PCL-CC-FeCl_(2)matrix(PCF-C)were prepared using polycaprolactone(PCL),corncob(CC)and divalent iron salt(FeSO_(4)and FeCl_(2))as electron donor with polyvinyl alcohol-sodium algi-nate(PVA-SA)as hybrid scaffolds.The denitrifying filter with iron-carbon synergistic nitrogen and phosphorus re-moval was constructed and the organic matter release characteristics and the enhanced nitrogen and phosphorus re-moval performance of PC,PCF-S and PCF-C in continuous flow denitrifying filter were compared.The results showed that,the three substrates could release carbon stably for more than 48 d.In PCF-C and PCF-S slow-release carbon source filters,there was an obvious synergistic effect between iron autotrophic denitrification and heterotro-phic denitrification.The combination of two kinds of denitrification could significantly enhance the removal effect of nitrogen and phosphorus in the filter.PC has the best denitrification potential among the three carbon source sub-strates.Compared with the medium and low concentration stage,the nitrogen removal efficiency of the three carbon source filters in the high concentration influent stage had decreased,and the denitrification effect had become worse.This was due to the accumulation of iron shells in the two PCF matrices in the high concentration influent stage,and the degree of accumulation was determined by the organic matter release rate and denitrification load.
作者
于鲁冀
郭智更
范鹏宇
谷立坤
李廷梅
任昆阳
彭赵旭
YU Luji;GUO Zhigeng;FAN Pengyu;GU Likun;LI Tingmei;REN Kunyang;PENG Zhaoxu(College of Ecology and Environment,Zhengzhou University,Zhengzhou 450001,China;Research Center for Environmental Policy Planning&Assessment of Zhengzhou University,Zhengzhou 450001,China;Henan University of Engineering,Zhengzhou 450001,China;College of Water Conservancy and Environmental Engineering,Zhengzhou University,Zhengzhou 450001,China)
出处
《工业水处理》
CAS
CSCD
北大核心
2023年第3期158-165,共8页
Industrial Water Treatment
基金
国家水体污染控制与治理科技重大专项(2015ZX07204-002-004,2012ZX07204-001-004)。
关键词
反硝化滤池
缓释碳源
共基质
铁盐脱氮
denitrification filter
slow-release carbon source
co-substrate
ferrous iron-dependent denitrification
