Pd/activated carbon sorbents for mid-temperature capture of mercury from coal-derived fuel gas

Higher concentrations of Hg can be emitted from coal pyrolysis or gasification than from coal combustion, especially elemental Hg. Highly efficient Hg removal technology from coal-derived fuel gas is thus of great importance. Based on the very excellent Hg removal ability of Pd and the high adsorption abilities of activated carbon（AC） for H2 S and Hg, a series of Pd/AC sorbents was prepared by using pore volume impregnation, and their performance in capturing Hg and H2 S from coal-derived fuel gas was investigated using a laboratory-scale fixed-bed reactor. The effects of loading amount, reaction temperature and reaction atmosphere on Hg removal from coal-derived fuel gas were studied. The sorbents were characterized by N2 adsorption, X-ray diffraction（XRD） and X-ray photoelectron spectroscopy（XPS）. The results indicated that the efficiency of Hg removal increased with the increasing of Pd loading amount, but the effective utilization rate of the active component Pd decreased significantly at the same time. High temperature had a negative influence on the Hg removal. The efficiency of Hg removal in the N2-H2S-H2-CO-Hg atmosphere（simulated coal gas） was higher than that in N2-H2S-Hg and N2-Hg atmospheres, which showed that H2 and CO, with their reducing capacity, could benefit promote the removal of Hg. The XPS results suggested that there were two different ways of capturing Hg over sorbents in N2-H2S-Hg and N2-Hg atmospheres.     

Quantitative method to determine the regional drinking water odorant regulation goals based on odor sensitivity distribution：Illustrated using 2-MIB

Taste and odor （T/O） in drinking water often cause consumer complaints and are thus regulated in many countries. However, people in different regions may exhibit different sensitivities toward WO. This study proposed a method to determine the regional drinking water odorant regulation goals （ORGs） based on the odor sensitivity distribution of the local population. The distribution of odor sensitivity to 2-methylisobomeol （2-MIB） by the local population in Beijing, China was revealed by using a normal distribution function/model to describe the odor complaint response to a 2-MIB episode in 2005, and a 2-MIB concentration of 12.9 ng/L and FPA （flavor profile analysis） intensity of 2.5 was found to be the critical point to cause odor complaints. Thus the Beijing ORG for 2-MIB was determined to be 12.9 ng/L. Based on the assumption that the local FPA panel can represent the local population in terms of sensitivity to odor, and that the critical FPA intensity causing odor complaints was 2.5, this study tried to determine the ORGs for seven other cities of China by performing FPA tests using an FPA panel from the corresponding city. ORG values between 12.9 and 31.6 ng/L were determined, showing that a unified ORG may not be suitable for drinking water odor regulations. This study presents a novel approach for setting drinking water odor regulations.     

新型环保道路抑尘剂在城市道路的应用

以北京部分城市道路扬尘为对象,研究了新型环保道路抑尘剂喷洒前后道路扬尘中PM10和PM2.5浓度的变化。结果显示,喷洒新型环保道路抑尘剂能够有效降低扬尘中PM10的浓度,对PM10的降尘效果为25%,对PM2.5也有一定的降尘效果,同时对大气中的氮氧化物有一定的吸附作用,说明该新型环保道路抑尘剂可有效抑尘,减少污染。     

超声波法对微囊藻的去除和抑制作用研究

超声波法可以通过破坏细胞壁达到直接除藻和抑制活体细胞生长的2种作用处理废水中微囊藻。以铜绿微囊藻的3种不同藻株为实验对象,对超声法直接去除微囊藻和超声法抑制微囊藻生长的影响因素分别进行单因素平行实验。采用叶绿素a含量作为活体藻细胞指标,分别对超声法除藻、抑藻的最佳条件进行了分析。结果显示,超声法对铜绿微囊藻不同藻株的去除效果基本一致,选用对数增长期的微囊藻在超声功率为1 200 W、超声时间为7 min时,叶绿素a去除率为82%,对微囊藻的直接去除效果最好。改变超声模式,采用多频次间歇超声模式(超声总能量相同):超声功率为1 200 W、隔1天超声2 min,共超声4次,培养14 d后与对照组相比,最终叶绿素a含量下降了95%,有更佳的微囊藻抑制效果。     

微孔沸石球的制备及其氨氮去除效率优化研究

以硅酸盐水泥为粘结剂,分别选取淀粉、葡萄糖、活性炭、壳聚糖为造孔剂,采用蒸压养护和高温烧结的方法制备微孔沸石球,研究了硅酸盐水泥含量、烧结温度、造孔剂种类和物料配比对沸石球的氨氮去除率、强度的影响。通过层次分析法筛选出最佳制备条件:物料配比为(100∶10∶5)(沸石∶水泥∶活性炭),1.2 MPa下蒸压养护6 h,烧结温度500℃,烧结时间2 h。制备的微孔沸石球对废水中氨氮去除率达到31.71%,强度为1.04 MPa。     

NF90纳滤膜除硼性能研究

压力、回收率、p H值、温度对NF90纳滤膜去除酸性模拟含硼废水中的硼有较大影响。结果表明,在压力一定时,除硼率随回收率的升高而降低,回收率一定时,除硼率随压力的升高而升高;p H在3~5时,除硼率随p H值升高而降低;温度的升高将使除硼率下降。在本实验条件下,NF90纳滤膜除硼率为20%~40%,采用NF90纳滤膜方法除硼还需进行更进一步的研究处理。     

专利资讯

正专利名称:一种原纸切割机废纸回收系统专利申请号:CN201220605232.6公开号:CN202964751U申请日:2012.11.16公开日:2013.06.05申请人:程肖本实用新型公开了一种原纸切割机废纸回收系统,包括集纸器、进纸管道、风机、出纸管道和储纸器,进纸管道的两端分别与集纸器和风机相连接,出纸管道的一端与风机相连接;集纸器内远离进纸管道端的底端设置有圆弧结构;出纸管道的高度高于风机的高度,其出口向下,出纸管道向下出口处设置有集纸袋,集纸袋的下端与储纸器连接。通过将集     

磷化氢的释放对提高生活污水除磷效果的试验研究

传统的污水除磷工艺通过排除剩余污泥或化学污泥达到除磷的目的,而磷化氢气体的发现,为污水除磷提供了新的途径。以磷化氢气体的形式将污水中的总磷排出系统,不仅能减少剩余污泥的排放,还能将磷化氢气体收集起来加以回收利用,可同时解决水体富营养化和磷资源匮乏的矛盾。本文首先总结了影响磷化氢气体产生的因素,并通过正交试验对密封的一体化生活污水反应器的工艺参数进行了优化,得出在铁投加量为100g、不进行预曝气时反应器收集到的磷化氢气体最多;然后通过研究磷化氢气体产生与污水总磷去除率的关系,得出提高磷化氢的释放速率将有助于提高生活污水的除磷效率;最后通过对正交试验前后系统中各种形态的磷进行物料衡算,分析了系统中磷的迁移转化途径。     

不同氮源对外源多胺在东海原甲藻生长作用中的影响

为探究多胺在东海赤潮高发区赤潮演替过程中的作用,利用中肋骨条藻(Skeletonema costatum)消亡期的藻液培养东海原甲藻(Prorocentrum donghaiense),探究多胺(腐胺、亚精胺、精胺)对东海原甲藻生长的影响,结果表明:在不同氮源的介质中,多胺对东海原甲藻生长的作用不同;在以硝酸盐和尿素为氮源补充时,添加多胺对东海原甲藻的生长有促进作用,且浓度越高,促进作用越明显;在补充复杂的有机氮源情况下,添加多胺对东海原甲藻的生长有抑制作用,且浓度越高,抑制作用越强烈。多胺对东海原甲藻生长的作用需要结合水体中的其他物质综合考虑。     

石墨-活性炭纤维复合电极电吸附处理含盐废水的研究

高盐废水是目前水处理领域的难点,作为一种新型的除盐技术,电吸附技术具有众多优点.本文研究了一种新型碳基复合材料,石墨-活性炭纤维复合电极,并考察了其应用于电吸附的影响因素和除盐效果.在电压为1.6 V,停留时间为60min,极板间距为1 cm时电吸附装置的除盐效果最优.用其分别对精制棉黑液和叶绿素铜钠废水进行了处理.电极对数为8对时对经酸析处理后的精制棉黑液的电导率和COD的去除率分别达到58.8%和75.6%;电极对数为6~8时对叶绿素铜钠生产废水的电导率的去除率能超过50.0%,COD的去除率约为13.5%.