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51.
利用物料衡算和源排放测试对江苏省典型汽车涂装企业VOCs排放特征进行研究,并提出最佳治理技术。结果表明,大客车单位涂装面积VOCs排放量达到300 g/m2以上,小轿车为40~60 g/m2。苯系物是VOCs排放的重要组分,最高占比为33.2%~64.6%。乙酸丁酯、异丙醇、丁醇等醇酯类物质近年来广泛用于代替苯系物溶剂,其排放占比为29.6%~61.2%。汽车涂装行业最佳治理技术包括采用3C1B、水性免中涂等先进涂装工艺,用粉末涂料、水性涂料和高固体成分涂料等代替溶剂型涂料,从源头控制排放。采用干式漆雾分离技术、转轮浓缩吸附-蓄热式焚烧技术等先进尾气治理技术,VOCs去除率可达99%以上。 相似文献
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汽车及零部件行业VOCs污染现状及减排对策分析 总被引:1,自引:0,他引:1
分析了汽车及零部件行业VOCs的主要来源和危害,阐述了我国现阶段汽车及零部件行业VOCs的污染现状。建议采取以源头削减和过程控制为重点、兼顾末端治理的全过程综合防治措施,控制汽车及零部件行业的VOCs排放。 相似文献
53.
For biofilters treating waste gases containing volatile organic compounds(VOCs), biomass accumulation is a common problem which will induce bed clogging and significant decrease in VOCs removal efficiency during long-term operation. In this study, ozone injection was developed as a biomass control strategy, and its effects on the biofilter performance and the microbial community structure were investigated in long-term operation. Two biofilters,identified as BF1 and BF2, were operated continuously for 160 days treating gaseous toluene under the same conditions, except that 200 mg/m3 ozone was continuously injected into BF1 during days 45–160. During the operation period, ozone injection did not change the toluene removal efficiency, while the pressure drop of BF1 with ozone injection was significantly lowered compared with BF2. The wet biomass accumulation rate of BF1 was 11 g/m~3/hr, which was only46% of that in BF2. According to the carbon balance result, ozone injection also increased the toluene mineralization rate from 83% to 91%, which could be an important reason for the low biomass accumulation. The PMA-q PCR result indicated that ozone injection increased the microbial viability of the biofilm. The high-throughput sequencing result also revealed that the dominant phyla and genera were not changed significantly by ozone injection, but some ozonetolerant genera such as Rhodanobacter, Dokdonella and Rhodococcus were enhanced by ozone exposure. All the results verified that ozone injection is capable of sustaining the long-term performance of biofilters by lowering the biomass accumulation, increasing the microbial viability and changing the microbial community structure. 相似文献
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采用泄漏检测与维修( LDAR)技术进行了全面检测和统计分析,分析泄漏的原因并通过维修减少泄漏。结果表明:芳烃抽提装置容易泄漏的元件主要为连接件和阀门,主要分布在泵区;SV≥5000μmol/mol的泄漏密封点占总密封点数的0.57%,对总泄漏量的贡献达到了82%,是造成泄漏排放的主要部分。设备管阀件泄漏造成的加工损失率为0.0009%,泄漏点停工维修修复率为83%,停工维修后整体泄漏率为0.03%;VOCs减排率为71%。 相似文献
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Cu–Mn, Cu–Mn–Ce, and Cu–Ce mixed-oxide catalysts were prepared by a citric acid sol–gel method and then characterized by XRD, BET, H2-TPR and XPS analyses. Their catalytic properties were investigated in the toluene combustion reaction. Results showed that the Cu–Mn–Ce ternary mixed-oxide catalyst with 1:2:4 mole ratios had the highest catalytic activity, and 99% toluene conversion was achieved at temperatures below 220°C. In the Cu–Mn–Ce catalyst, a portion of Cu and Mn species entered into the CeO2 fluorite lattice, which led to the formation of a ceria-based solid solution. Excess Cu and Mn oxides existed on the surface of the ceria-based solid solution. The coexistence of Cu–Mn mixed oxides and the ceria-based solid solution resulted in a better synergetic interaction than the Cu–Mn and Cu–Ce catalysts, which promoted catalyst reducibility, increased oxygen mobility, and enhanced the formation of abundant active oxygen species. 相似文献
57.
OMS-2 nanorod catalysts were synthesized by a hydrothermal redox reaction method using MnSO4 (OMS-2-SO4) and Mn(CH3COO)2 (OMS-2-AC) as precursors. SO42 −-doped OMS-2-AC catalysts with different SO42 − concentrations were prepared next by adding (NH4)2SO4 solution into OMS-2-AC samples to investigate the effect of the anion SO42 − on the OMS-2-AC catalyst. All catalysts were then tested for the catalytic oxidation of ethanol. The OMS-2-SO4 catalyst synthesized demonstrated much better activity than OMS-2-AC. The SO42 − doping greatly influenced the activity of the OMS-2-AC catalyst, with a dramatic promotion of activity for suitable concentration of SO42 − (SO4/catalyst = 0.5% W/W). The samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), inductively coupled plasma optical emission spectroscopy (ICP-OES), NH3-TPD and H2-TPR techniques. The results showed that the presence of a suitable amount of SO42 − species in the OMS-2-AC catalyst could decrease the Mn–O bond strength and also enhance the lattice oxygen and acid site concentrations, which then effectively promoted the catalytic activity of OMS-2-AC toward ethanol oxidation. Thus it was confirmed that the better catalytic performance of OMS-2-SO4 compared to OMS-2-AC is due to the presence of some residual SO42 − species in OMS-2-SO4 samples. 相似文献
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于2020年9~10月在深圳北部典型工业区开展在线观测以分析该地VOCs污染状况,并使用基于观测的模型(OBM)研究臭氧生成敏感性.观测期间VOCs的总浓度为48.5×10-9,浓度水平上烷烃>含氧有机物(OVOCs)>卤代烃>芳香烃>烯烃>乙炔>乙腈.臭氧生成潜势(OFP)为320μg/m3,其中芳香烃、OVOCs以及烷烃贡献最大,这3类物种OFP贡献总和超过90%.乙烯与苯呈现“两峰一谷”的日变化特征,主要受到机动车排放的贡献.相对增量反应性(RIR)分析表明,削减人为源VOCs对控制当地臭氧生成最为有效,当中又应优先控制芳香烃;经典动力学曲线(EKMA)分析表明该片区臭氧生成处于过渡区,在开展VOCs区域联防联控的同时,需要在当地进行有力的NOx控制以强化该地区臭氧污染长期管控. 相似文献