MEA-MDEA-DETA三元复合胺溶液吸收烟气中CO_2

采用乙醇胺-N-甲基二乙醇胺-二乙烯三胺(MEA-MDEA-DETA)三元复合胺溶液吸收模拟烟气中CO_2。实验结果表明:MEA-MDEA-DETA 三元复合胺溶液的CO_2吸收速率明显大于DETA溶液和MEA-MDEA复合胺溶液的CO_2吸收速率,但低于DETA溶液与MEA-MDEA复合胺溶液CO_2吸收速率之和;350 mL0.5 mol/L MEA-0.5 mol/L MDEA-0.3 mol/L DETA三元复合胺溶液的CO_2吸收量为0.327 2 mol,小于相同体积0.3 mol/L DETA溶液与0.5 mol/L MEA-0.5 mol/L MDEA复合胺溶液的CO_2吸收量之和;MEA-MDEA-DETA三元复合胺溶液吸收CO_2达到饱和时,溶液pH约为8.0,溶液电位约为-80 mV。MEA-MDEA-DETA三元复合胺溶液吸收CO_2饱和后的再生温度为103℃,一次再生率约为87.5%。     

烯胺活化羟乙基乙二胺吸收CO2的反应热

以羟乙基乙二胺（AEEA）为基础吸收剂,分别加入二乙烯三胺（DETA）、三乙烯四胺（TETA）、四乙烯五胺（TEPA）作为活化剂,探讨了不同烯胺体积分数和CO2负载量（吸收的CO2与活化吸收剂的摩尔比）对各烯胺活化的AEEA吸收剂CO2吸收热、解吸热、CO2脱除率的影响。综合对比结果,最优的活化吸收剂为AEEA+5%（φ）DETA,其最低CO2吸收热为63.0 kJ/mol（以每摩尔CO2计）,解吸热为82.5 kJ/mol,CO2脱除率为76.2%。     

煤矿天然制冰降温技术的可行性分析

借鉴国内外天然制冰的相关资料,提出了用于矿井降温制冷的天然制冰降温技术.通过建立冰池喷淋制冰和蓄冰模型,从理论上分析了天然制冰技术的可行性.通过对制冰费用与矿井当前降温费用的比较,突出了该技术研究的经济效益.同时,对该技术存在的相关问题进行了分析,对研究前景进行了展望.     

Ecotoxicological effects of waterborne PFOS exposure on swimming performance and energy expenditure in juvenile goldfish (Carassius auratus)

The potential risks of perfluorooctane sulfonate (PFOS) are of increasing ecological concern. Swimming performance is linked to the fitness and health of fish. However, the impacts of PFOS on swimming performance remain largely unknown. We investigated the ecotoxicological effects of acute exposure to PFOS on the swimming performance and energy expenditure of juvenile goldfish (Carassius auratus). The fish were exposed to a range of PFOS concentrations (0, 0.5, 2, 8 and 32 mg/L) for 48 hr. The spontaneous swimming activity, fast-start swimming performance, critical swimming speed (Ucrit) and active metabolic rate (AMR) of the goldfish were examined after exposure to PFOS. PFOS exposure resulted in remarkable effects on spontaneous activity. Motion distance was reduced, and the proportion of motionless time increased with increasing concentrations of PFOS. However, no significant alterations in the fast-start performance-related kinematic parameters, such as latency time, maximum linear velocity, maximum linear acceleration or escape distance during the first 120 msec after stimulus, were observed after PFOS exposure. Unexpectedly, although PFOS exposure had marked influences on the swimming oxygen consumption rates and AMR of goldfish, the U crit of the goldfish was not significantly affected by PFOS. This may result in a noteworthy increase in the energetic cost of transport. The overall results indicate that, in contrast to spontaneous activity, underlying swimming capabilities are maintained in goldfish after short-term exposure to PFOS, but energy expenditure during the process of swimming is dramatically aggravated.     

城市环境噪声测量中布点数的优化研究

应用主成分分析,模糊聚类概念及动态规划方法对环境噪声测量的布点数进行优化研究。所建立的模型试用于厦门市环境噪声布点数的优化研究。     

Removal of elemental mercury with Mn/Mo/Ru/Al2O3 membrane catalytic system

In this work, a catalytic membrane using Mn/Mo/Ru/Al₂O₃ as the catalyst was employed to remove elemental mercury (Hg⁰) from flue gas at low temperature. Compared with traditional catalytic oxidation (TCO) mode, Mn/Al₂O₃ membrane catalytic system had much higher removal efficiency of Hg⁰. After the incorporation of Mo and Ru, the production of Cl₂ from the Deacon reaction and the retainability for oxidants over Mn/Al₂O₃ membrane were greatly enhanced. As a result, the oxidization of Hg⁰ over Mn/Al₂O₃ membrane was obviously promoted due to incorporation of Mo and Ru. In the presence of 8 ppmv HCl, the removal efficiency of Hg⁰ by Mn/Mo/Ru/Al₂O₃ membrane reached 95% at 423 K. The influence of NO and SO₂ on Hg⁰ removal were insignificant even if 200 ppmv NO and 1000 ppmv SO₂ were used. Moreover, compared with the TCO mode, the Mn/Mo/Ru/Al₂O₃ membrane catalytic system could remarkably reduce the demanded amount of oxidants for Hg⁰ removal. Therefore, the Mn/Mo/Ru/Al₂O₃ membrane catalytic system may be a promising technology for the control of Hg⁰ emission.     

连续流分段进水工艺生物脱氮除磷技术分析及优化控制

连续流分段进水工艺可最大程度利用污水碳源,对低C/N城镇生活污水及工业废水具有深度脱氮除磷特性.详述了连续流分段进水工艺生物脱氮除磷原理和工艺特性,重点分析了段数、流量分配比、各段缺氧区和好氧区容积分配比、溶解氧、污泥回流比、原水水质等对工艺运行性能的影响因素.并结合国内外研究现状和工程应用实例,概述了工艺的过程控制的研究情况和应用前景.开展针对中国污水水质的工艺设计试验研究和相应的工艺过程控制研究是加快分段进水工艺应用于中国污水处理行业的两大技术突破点.