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231.
为了解决炼化企业停车检修蒸汽吹扫废气难处理这一行业难题,采用喷淋水洗、膜分离、低温催化氧化组成的移动式废气处理技术,对某炼厂裂解重馏分罐蒸汽蒸煮和吹扫过程所产生废气进行处理。结果表明:进气非甲烷总烃浓度可达24 000 mg·m−3,温度为 80~95 ℃;尾气中非甲烷总烃指标全部低于12 mg·m−3,去除率达99%以上,烃类物质的回收率可达75%;喷淋单元的功能是降低废气温度,去除酸性气体并回收重质烃类;膜分离单元有效提升装置运行稳定性,提高有机物回收效率;低温催化技术可对不可凝烃类进行深度处理。该处理技术能够为困扰炼厂的停检修蒸汽吹扫废气的治理提供参考。 相似文献
232.
以TiO2/Ti薄膜电极为阳极、石墨电极为阴极、饱和甘汞电极为参比电极,设计了一种新型的双槽光电化学协同催化反应器,考察了阴极电位、反应时间、电解质浓度、溶液pH值等因素对甲基橙降解效果的影响.结果表明,电解质浓度对甲基橙的降解脱色效果影响不明显,而阴极电位、溶液pH值和反应时间则影响显著;色度为200度的甲基橙溶液,在阴极电位(Ec)为-0.6V、阴极槽初始pH3.0和阳极槽初始pH5.6、反应90min的条件下,阴极槽和阳极槽中甲基橙的脱色率分别为98.3%和51.3%,与仅靠TiO2/Ti薄膜阳极对有机物进行催化降解的“双槽单效”光电催化反应器相比,对甲基橙的催化氧化降解效率显著提高.降解前后的紫外-可见吸收光谱的变化表明,该双槽光电化学协同催化反应器不但可以同时使阴、阳两槽中的甲基橙脱色,且其苯环结构也被降解和矿化. 相似文献
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234.
Bio-oil from pyrolysis of biomass is an important renewable source for liquid fuel and/or for chemicals. However, the application of bio-oil was severely restricted due to its high viscosity, acidity, and low heating value. Hence, it is necessary to upgrade the bio-oil for deoxygenation or for chemicals by catalytic reactions. In this paper, the catalytic behaviors of SAPO-34, ZSM-5, and Y zeolite on pyrolysis of cellulose were investigated via pyrolyzer combined with gas chromatography and mass spectrometer (Py-GC/MS) method in Py-mode. The results showed that ZSM-5 and Y zeolite could promote the conversions of oxygen-containing components to gases, water, aromatics, and phenols. Comparatively, more gas and water were generated under the catalysis of Y zeolite at lower temperatures, while at temperatures above 700°C, the effect of ZSM-5 became more distinct; aromatics were more generated under the catalysis of ZSM-5, while Y zeolite exerted a more distinct role in promoting the formation of phenols. The effect of SAPO-34 caused more water and furfural derivatives, less aromatics and phenols, and exerted a weak influence on gases. 相似文献
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《Environmental engineering science》2011,28(12):891-896
Abstract In this study, iron oxides immobilized onto silica and alumina granular carriers in a fluidized-bed reactor were applied as silica granule (SG) and alumina granule (AG) catalysts, respectively; the SG and AG catalysts were used to explore the catalytic decomposition of H2O2. Effects of H2O2 concentration and temperature on the oxidation of aniline were determined to compare the reactive efficiencies of the SG and AG catalysts. Results showed that H2O2 decomposition could be efficiently catalyzed by the SG and AG catalysts. Degradation rates of aniline increased with increasing H2O2 concentration and temperature in both catalyst systems. The AG catalyst (smaller particle size) had more surface sites for precipitation of iron oxide than the SG catalyst (larger particle size). Consequently, in the initial stages of the reaction, hydroxyl radicals (?OH) were generated more rapidly with the AG catalyst than with the SG catalyst and the degradation of aniline by the AG catalyst was faster than that by ... 相似文献
238.
活性炭催化臭氧氧化处理染料废水生化出水研究 总被引:3,自引:1,他引:2
采用饱和活性炭作为臭氧氧化催化剂,对染料废水生化出水进行深度处理.以废水COD、DOC去除率为指标,考察饱和活性炭对臭氧的催化效果.使用6种不同的活性炭作为催化剂(编号1#~6#),并将6#活性炭采用KMnO4、NaOH、ZnCl2、H2SO4、H3PO4进行表面处理,在活性炭的孔体积、酸碱基团等表面性质测定的基础上,探讨活性炭性质与催化臭氧化效率的关系.结果显示,活性炭催化效果与大孔体积密切相关;另一方面,使用微孔膜片减小臭氧气泡尺寸,增大臭氧的传质面积,提高臭氧利用率,可以改善臭氧/活性炭催化氧化处理效果. 相似文献
239.
Caicai Wang Shengwang Gao Jianchao Zhu Xunfeng Xi Mingxin Wang Yanna Xiong 《环境科学学报(英文版)》2021,33(1):249-259
A series of Sr-doped BiFeO3 perovskites (Bi1-xSrxFeO3, BSFO) fabricated via sol-gel method was applied as peroxydisulfate (PDS) activator for ciprofloxacin (CIP) degradation. Various technologies were used to characterize the morphology and physicochemical features of prepared BSFO samples and the results indicated that Sr was successfully inserted into the perovskites lattice. The catalytic performance of BiFeO3 was significantly boosted by strontium doping. Specifically, Bi0.9Sr0.1FeO3 (0.1BSFO) exhibited the highest catalytic performance for PDS activation to remove CIP, where 95% of CIP (10 mg/L) could be degraded with the addition of 1 g/L 0.1BSFO and 1 mmol/L PDS within 60 min. Moreover, 0.1BSFO displayed high reusability and stability with lower metal leaching. Weak acidic condition was preferred to neutral and alkaline conditions in 0.1BSFO/PDS system. The boosted catalytic performance can be interpreted as the lower oxidation state of Fe and the existence of affluent oxygen vacancies generated by Sr doping, that induced the formation of singlet oxygen (1O2) which was confirmed as the dominant reactive species by radical scavenging studies and electron spin resonance (ESR) tests. The catalytic oxidation mechanism related to major 1O2 and minor free radicals was proposed. Current study opens a new avenue to develop effective A-site modified perovskite and expands their application for PDS activation in wastewater remediation. 相似文献
240.