RTO尾气余热利用技术探讨

我国目前多数汽车涂装车间采用RTO来处理车身油漆烘烤产生的有机废气,有机废气经过RTO处理后一般直接排放,这些排放的气体的温度为200℃左右,尚有较大的利用价值。介绍了汽车涂装车间利用RTO的高温尾气来预热烘干炉所需要的新鲜空气的节能技术,并分析其经济性,探讨RTO尾气的余热利用方法。     

有机废气催化燃烧催化剂研究进展

催化燃烧作为有机废气(VOCs)处理技术之一,具有反应温度低、效率高及能耗低等优点,而催化燃烧核心是催化剂,本文系统的介绍了催化剂载体及活性组分,详细综述了现阶段两方面的研究进展,并在最后指出了今后催化燃烧催化剂的研究重点。     

某香料香精厂有机废气的收治改造

为解决香料香精生产过程中有机废气的高效收集和长效处理难题,对某香料香精厂废气收治系统进行了改造。重点对各生产车间反应釜卸料点、水喷射真空泵循环水箱、平板式离心机、污水处理池以及危险废物暂存间产生的无组织有机废气进行了有组织收集改造,对全厂废气总量重新进行了核算,并重新选择了合适的末端处理工艺。经整改后,厂房外无组织排放有机废气、排口浓度均能稳定达标排放。     

钽铌湿法冶金中的环境污染与治理措施

分析论述了钽铌冶金过程中的污染来源、污染形式、特点及危害，指出含氟化物、放射性、有机萃取剂的废渣、废水、废气是其主要污染物，并针对性地介绍了对这些污染物的治理措施。     

稀土生产中的废气处理

本文叙述了我国稀土生产中的废气处理状况，包括废气的来源，种类、组成和特点，处理方法及其效果；废气排放的国家标准，并对一些问题进行分析和讨论。     

有机废液和废气联合焚烧处理技术的研究与应用

针对医药企业产生的有机废液和废气必须进行无害化处理的问题,提出了一种联合焚烧处理工艺,对废液和废气同时进行处理,并将该工艺在工程中进行了应用。应用实践表明,该工艺能够同时对废液和废气进行无害化处理,初投资较低。且该工艺对废液和废气焚烧产生的热量进行了回收再利用,运行成本较低,在危险废物处置领域具有广阔的应用前景。     

稀土生产中的废气处理

本文综述了我国稀土生产中的废气处理状况。其内容包括废气的来源、种类、组成和特点；处理方法及其效果；废气排放的国家标准，并对提高和完善废气处理技术等有关问题进行分析和讨论。     

烟气脱硫脱硝技术的现状与发展

介绍了国内外烟气脱硫、脱硝及同时脱硫硝技术的现状，分析了各种技术手段的特点和适用范围，指出了我国解决二氧化硫和氮氧化物污染办法，对于钢铁企业废气处理有借鉴之处。     

稀土生产中的废气处理

综述了我国稀土生产中的废气处理状况。其内容包括废气的来源，种类、组成和特点；处理方法及其效果。     

矿业环保技术发展的现状与展望

重点介绍了我国金属矿山环境保护中粉尘，废气，废水和废渣等方面的防护和处理技术的发展现状，并针对我国当前情况提出了建议。     

Full-Scale Application of a Dynamic Model for High-Rate Anaerobic Wastewater Treatment Systems

High-rate anaerobic treatment systems are becoming increasingly popular to treat industrial wastewater containing large amounts of organic matter in the form of carbohydrates or proteins. Mathematical models of these systems can serve as tools for equipment sizing, process design, control and optimization, plant operation, and operator training. Several models for these plants have been proposed which have been validated and tested on laboratory-scale systems. Information on full-scale application of these models is not readily available. In this paper, a model only previously validated on laboratory scale was applied at full scale. The model was used to predict the behavior of two full-scale plants of different designs treating brewery wastewater under dynamic conditions. Influent and effluent liquid streams and gas flows were sampled over a 4 and 10 day period for the two plants, respectively. Limited characterization to just total carbon in feed over only four days was sufficient to predict the gas production rate or total volatile organic acid concentration in the effluent of the methanogenic reactor. Elaborate measurements over 10 days of feed characteristics including organic acid concentrations were important in obtaining good full-scale predictions of all variables that were modeled. Apart from the operating variables, the key parameter that required re-estimation for the full-scale system was the solids retention time in the methanogenic stage.     

熔炼环集烟气处理技术创新

国家环保要求越来越高,有机胺脱硫技术虽然能优化环保指标,但在处理火法环集烟气方面仍存在一定缺陷,通过自动除酸雾脱湿技术及布袋收尘消防喷吹技术的研发,高效喷淋净化技术的应用,应用新技术,降低再生蒸汽消耗等一系列创新技术措施,从而降低环集脱硫尾排 SO2 浓度。     

CODS溶剂脱除高炉煤气中有机硫性能考察

为了研发脱除高炉煤气中有机硫的技术方法,以便优化利用钢铁厂的高炉煤气,降低高炉煤气用户的烟气硫含量,达到国家超低排放建议,以钢厂高炉煤气为原料,考察了高效复合脱硫有机溶剂(CODS)脱除有机硫和硫化氢的性能,对CODS溶剂的吸收工艺条件进行了优化,并分析了高炉煤气中有机硫的脱除机理。试验结果表明,在CODS溶剂浓度为45%、气液比(V_g/V_L)为180、操作温度为45 ℃的优化工艺条件下,净化气中的H₂S和有机硫浓度分别为2.4和15.8 mg/m3,总硫量为21.0 mg/m3,达到国家超低排放建议的同时又兼顾经济性。     

Removal of EATX from Waste Gases by a Trickle-Bed Air Biofilter

The trickle-bed air biofilter performance for treating mixtures of ethylacetate (EA), toluene (T), and xylene (X) volatile organic compounds (VOCs) was evaluated under different influent VOC loadings. The EA removal efficiencies were significantly higher than those for T and X, indicating that EA is a preferred substrate in the EATX waste gas. More than 80% removal efficiencies could be achieved under influent loadings below 77 g EA∕m3∕h, 8 g T∕m3∕h, and 10 g X∕m3∕h. The trickle-bed air biofilter appears efficient for controlling EATX emission with medium EA loadings and low TX loadings. The elimination capacities of EA, T, and X for a pure VOC feed were higher than for a mixed VOC feed and the differences increased with increased influent VOC loading.     

Heat Transfer Model for Regenerative Beds

Regenerative catalytic oxidizers (RCO) are an economic and effective means of controlling volatile organic compounds with concentrations exceeding 1,200 mg∕m3 in a gas stream. However, factors influencing the performance of RCO when treating volatile organic compounds in gas streams have seldom been addressed. Therefore, this study presents a convection-dispersion model with an effective thermal diffusivity αe as a parameter to simulate the performance of RCO. To verify the effectiveness of the proposed model, a pilot-scale RCO was constructed with two 20 × 200 cm (inside diameter × height) regenerative beds. Gravel was used as the thermal regenerative solid material. Experimental results indicated that the model with an αe of 2.0–3.8 × 10?6 m2∕s can be used to describe the time variation of solids temperature with the packing height at superficial gas velocities Ug of 0.080–0.382 m∕s. Values of αe for the bed are closer to those for the gravel solids (αs = 1.0 × 10?6 m2∕s) than for air (αg = 54 × 10?6 m2∕s). Those results further demonstrate that the conductive heat transfer in the solid material in the axial direction of the bed is a major controlling factor for the performance of the RCO and the convective one is a minor factor in the present case.     

川东北高含硫天然气中有机硫化合物的分析方法研究

基于脉冲火焰光度检测器(PFPD)对硫化合物具有高的灵敏度和选择性以及价格低廉等优点,采用硫化氢选择性吸收法和气相色谱-脉冲火焰光度法(GC-PFPD)相结合技术,对川东北高含硫天然气中有机硫化合物的形态分布进行了分析。优化了天然气预处理工艺条件,采用惰性的预处理系统除去高含硫天然气中的硫化氢,收集剩余的有机硫气体,用GC-PFPD法进行分析检测,根据标准物质保留时间定性方法和外标定量方法进行了定性和定量研究。结果表明:在最佳的实验条件下,该方法能充分除去高含硫天然气中硫化氢,且操作简单,对同一样品重复测定5次,各组分的相对标准偏差(RSD)都在10%以内,方法的加标回收率在91%~104%之间。     

碳纤维工业废气的处理技术

对碳纤维工业废气的来源及处理方法进行了总结。通过对吸附法、吸收法、燃烧法等处理废气方法的优缺点比较,认为燃料助燃法和催化燃烧法均适用于处理碳纤维工业尾气。由于催化燃烧法需要催化剂,建议开展催化燃烧法处理碳纤维工业废气的专题研究,使碳纤维工业尾气得到更加有效和环保的处理。     

UASB Treatment of Tapioca Starch Wastewater

Feasibility of the upflow anaerobic sludge blanket (UASB) process was investigated for the treatment of tapioca starch industry wastewater. After removal of suspended solids by simple gravity settling, starch wastewater was used as a feed. Start-up of a 21.5-L reactor with diluted feed of approximately 3,000 mg∕L chemical oxygen demand (COD) was accomplished in about 6 weeks using seed sludge from an anaerobic pond treating tapioca starch wastewater. By the end of the start-up period, gas productivity of 4–5 m3/m3r?day was obtained. Undiluted supernatant wastewater with a COD concentration of 12,000–24,000 mg∕L was fed during steady-state reactor operation at an organic loading rate of 10–16 kg COD/m3r?day. The upflow velocity was maintained at 0.5 m∕h with a recirculation ratio of 4:1. COD conversion efficiencies >95% and gas productivity of 5–8 m3/m3r?day were obtained. These results indicated that removal of starch solids from wastewater by simple gravity settling was sufficient to obtain satisfactory performance of the UASB process.     

关于架崖山大型露天矿自卸汽车废气污染及净化探讨

分析了露天矿自卸汽车柴油发动机废气排放的相关问题,提出废气处理的技术措施。