吸收吸附联合法净化氧化铝厂含硫化氢废气

针对中国长城铝业公司氧化铝厂生产过程中产生的含硫化氢废气,设计了赤泥附液吸收和活性炭吸附联合净化系统。吸收系统对硫化氢的去除效率是85%,吸附系统对硫化氢的去除效率是99%,整个处理系统对硫化氢的总去除效率是99.85%,经过处理后,系统出口硫化氢的浓度达到了恶臭污染物排放标准(GB14554-93)的要求。整个吸收-吸附系统的投资是168.5万元,处理单位成本0.33元/Nm3。     

Determination of total arsenic by photo-decomposition of organoarsenic compounds and hydride generation electrothermal atomic absorption spectrometry

A method was developed for the determination of total arsenic concentration in less than ng/ml level by decomposition of organoarsenicals using photo -oxidation combined with in situ trapping of arsenic hydride on a palladium coated graphite tube with subsequent atomization and detection by AAS. The organoarsenicals include monomethylarsenic, dimethylarsenic, arsenobetaine, arsenocholine, o -aminobenzenarsenate and p -aminobenzenarsenate. The method is simple and sensitive. Detection limit was obtained from different arsenic compounds over the range from 0. 058 to 0.063 ng/ml as As (based on three times of the standard deviation of 10 blank measurements) and the relative standard deviations for ten replicate measurements were from 2.0 to 3.8%. The calibration curves of arsenic compounds including inorganic and organic arsenicals were linear over the range from 0.1 to 3.0 ng/ml as As. The recommended method has been applied to the determination of total arsenic in tap and lake water samples at ng/ml leve     

制氧站噪声综合治理

本文详细介绍了制氧站噪声综合治理方案.在治理中,根据噪声监测和频谱分析,采用成熟的噪声治理技术,如隔声、吸声和消声等,同时借鉴了近年来噪声治理的经验,取得了良好的治理效果.设计中充分考虑了防火、防爆和通风,达到了《氧气站设计规范》(GB50030-91)中有关消防的要求.     

红树幼苗对汞的吸收和净化

在砂培条件下用含汞海水处理的秋茄和桐花树等红树幼苗,其汞含量随着原培养液汞含量增加而增加.所吸收的汞大部分累积于根部,在1ppm汞浓度组,根部吸收的汞仅约有3％被转运到茎叶中.汞在根中的积累是与培养液汞含量呈双对数正相关.秋茄和桐花树根对汞的积累分别是原培养液汞浓度的16—174和16—100倍.桐花树和秋茄整株植物在四星期内吸收汞总量分别为原加汞总量的3.5—21％和3.2—37％.1ppm汞未对红树植物发生毒害作用,因此红树林对海水汞污染有一定的净化作用.     

活性炭填料塔碱吸收NOx尾气的研究

近年来,国内外对NO_x尾气治理方法的研究十分活跃,已有一些报道,所提出的方法虽多,但由于技术、经济等方面的原因,工业上采用的不多。 我们采用活性炭填料塔的分气纯碱溶液吸收法,脱除率高达89—97％,排放浓度可由4000-5000ppm降至157-455ppm。     

空气—乙炔火焰原子吸收法测定水中锶

用空气—乙炔还原型火焰原子吸收分光光度法测定水中微量的锶，在试样中加入硝酸镧溶液（10%）、氯化钠及氯化钾消除酸对测定水中锶的干扰和共存离子的干扰并抑制了电离干扰，提高了灵敏度，线性范围0.05-5.00mg/L，最低检出限浓度为0.01mg/L，回收率为90-104%。     

山东省高速公路主要绿化树木叶片硫、铅含量分析

汽车尾气会给高速公路路域环境带来一定程度的硫(S)、铅(Pb)污染,而绿化树木可通过吸收作用从而有效降低这些污染物在空气中的含量,目前这方面的研究较少。对山东省高速公路路侧主要绿化树木叶片S、P质量分数的研究表明,I107杨树(Populus Linn.)叶片S、Pb质量分数与高速公路车流量呈显著正相关。I107杨树叶片S、Pb质量分数对高速公路路域环境污染具有一定指示作用,不同路段杨树叶片的S、Pb质量分数存在明显差异,济青高速公路路侧杨树叶片的S、Pb质量分数最高,其次是京沪高速,最低的是日东高速。I107杨和龙柏对S污染物的吸收能力较强,其次是垂柳(Salix babylonica L.),较差的是紫叶李(Prunus cerasifera cv.Pissardii.)、大叶女贞(Ligustrum lucidumAit)和雪松(Cedrus deodara(Roxb.)Loud);而I107杨和紫叶李对Pb的吸收能力较强。     

不同铝水平下茶对铝及矿质养分的吸收与累积

土壤铝污染不仅影响作物的生长发育和产量,也对食品安全产生了潜在威胁。利用水培方法,设置0、5、10、15、20mg·L-15种铝处理水平,研究不同铝质量浓度水平下茶苗对铝及矿质养分的吸收与累积。结果表明:茶苗根、茎中铝含量均随着铝处理的质量浓度的增加而明显增加,而叶中含量影响不大。不同铝水平下各部位铝含量大小依次为根>叶>茎。从整株植物来看,随着铝处理质量浓度的增加,铝在根部的积累量增加,在茎和叶的积累量趋于下降。铝对茶苗营养元素钙、钾、镁的吸收影响不大,对磷的吸收有所促进,在一定程度上体现出茶树植物对铝的耐性。     

The degradation of gel-spun poly(β-hydroxybutyrate) “wool”

The apparent biodegradability and biocompatibility of the microbially produced polyester, poly(-hydroxybutyrate) (PHB), has been the focus of much research by a number of authors with regard to its potential for use in packaging and medical implantation devices. PHB has recently been produced by gel-spinning into a novel form, with one possible application being as a wound scaffolding device, designed to support and protect a wound against further damage while promoting healing by encouraging cellular growth on and within the device from the wound surface. This new nonwoven form combines a large volume with a low mass, has an appearance similar to that of cotton wool, and has been called wool because of this similarity. The hydrolytic degradation of this wool was investigated in an accelerated model of pH 10.6 and temperature 70°C. It was determined that the PHB wool gradually collapsed during degradation. The surface area-to-volume ratio was concluded to be a primary influencing factor. Degradation was characterized by a reduction in the glass transition temperatures and melting points and a fusion enthalpy peak of maximum crystallinity, (88%), which coincided with the point of matrix collapse.     

Simultaneous Measurements of Atmospheric Pollutants and Visibility with a Long-Path DOAS System in Urban Areas

In this paper, the applicability of a Long-Path Differential Optical Absorption Spectroscopy (LP-DOAS) system was checked for the feasibility of the simultaneous measurement of trace gases (such as O₃, NO₂, SO₂, and HCHO) and atmospheric visibility (light extinction by aerosols) in Asian urban areas. Field studies show that an LP-DOAS system can simultaneously measure the key pollutants (such as O₃, NO₂, SO₂, and HCHO) at detection limits in the ppb/sub-ppb range as well as the Mie extinction coefficient with an uncertainty of 0.1 km^–1 at time resolution of a few minutes. It is thus concluded that the use of LP-DOAS system is feasible for simultaneous measurement of gaseous pollutants as well as an atmospheric extinction coefficient which is tightly bound to fine particulate concentration.