摘要
分别采用以木屑/泥炭为填料的生物过滤塔(BF)和以聚氨酯小球为填料的生物滴滤塔(BTF)净化α-蒎烯废气,比较两者的挂膜时间及对α-蒎烯的降解性能.结果表明,采用气液相联合方法,过滤塔和滴滤塔分别在21d和27d内完成挂膜;扫描电镜观察表明,填料上生物膜菌群生长良好,优势菌为杆菌和球菌.在α-蒎烯进口浓度80～2200mg.m-3、空床停留时间(EBRT)29～102s条件下,两者对α-蒎烯均有较好的去除效果,过滤塔与滴滤塔的最大去除负荷分别为50g.m-.3h-1和43g.m-.3h-1;滤塔中CO2生成量与α-蒎烯降解量之间呈线性关系,通过线性拟合得出过滤塔与滴滤塔的α-蒎烯矿化率分别为74%与68%,滤塔中减少的α-蒎烯主要被微生物利用而去除.菌落数(CFU)分析表明,在挂膜阶段滤塔微生物数量增长明显,稳定运行阶段菌落数随着EBRT的延长而增加,在EBRT102s条件下单位反应器空间内过滤塔和滴滤塔菌落数分别为5.52×1014cfu.m-3和1.84×1014cfu.m-3.
A biofilter（BF）packed with wood chip/peat and a biotrickling filter（BTF）packed with ether-based polyurethane foam were employed to remove α-pinene from waste gases.The start-up time and reactor performance were investigated for both reactors.The start-up procedures of the BF and the BTF were finished by joint gas-liquid phase inoculation within 21 d and 27 d,respectively.Scanning electron microscopy revealed that bacterial communities grew well on the carriers,and bacilli and cocci may be the dominant bacteria.Under the conditions of inlet α-pinene concentrations of 80~2200 mg·m^-3 and empty bed residence time（EBRT）of 29~102 s,both BF and BTF could effectively degrade α-pinene,and the maximum elimination capacities were 50 g·m^-3·h^-1and 43 g·m^-3·h^-1 respectively.The mass ratio of carbon dioxide produced to the α-pinene removed was approximately linear,and the mineralization rates of α-pinene in the BF and BTF obtained were 74% and 68%,respectively.The results indicated that the α-pinene was removed mainly via biodegradation.Colony forming unit（CFU）analysis showed that the biomass concentration in the BF and BTF increased during the start-up stages of operation,and increased with EBRT during the steady-state operation.When EBRT was set at 102 s,biomass concentrations in the BF and BTF reached 5.52×10^14cfu·m^-3 and 1.84×10^14cfu·m^-3,respectively.
出处
《环境科学学报》
CAS
CSCD
北大核心
2010年第6期1121-1129,共9页
Acta Scientiae Circumstantiae
基金
国家高技术研究发展计划(863)项目(No.2006AA06A310)
浙江省科技计划项目(No.2008C23082)
国家科技支撑计划专题项目(No.2007BAE58B07)
浙江省自然科学基金(No.R5090230)~~
