Combination with catalyzed Fe(0)-carbon microelectrolysis and activated carbon adsorption for advanced reclaimed water treatment: simultaneous nitrate and biorefractory organics removal

A process combining catalyzed Fe(0)-carbon microelectrolysis (IC-ME) with activated carbon (AC) adsorption was developed for advanced reclaimed water treatment. Simultaneous nitrate reduction and chemical oxygen demand (COD) removal were achieved, and the effects of composite catalyst (CC) addition, AC addition, and initial pH were investigated. The reaction kinetics and reaction mechanisms were calculated and analyzed. The results showed that CC addition could enhance the reduction rate of nitrate and effectively inhibit the production of ammonia. Moreover, AC addition increased the adsorption capacity of biorefractory organic compounds (BROs) and enhanced the degradation of BRO. The reduction of NO₃^?–N at different pH values was consistently greater than 96.9%, and NH₄⁺–N was suppressed by high pH. The presence of CC ensured the reaction rate of IC-ME at high pH. The reaction kinetics orders and constants were calculated. Catalyzed iron scrap (IS)-AC showed much better nitrate reduction and BRO degradation performances than IS-AC and AC. The IC-ME showed great potential for application to nitrate and BRO reduction in reclaimed water.

     

超临界CO2回收线路板工艺研究

采用正交试验设计进行了超临界CO₂回收废弃印刷线路板的实验。以温度、压强、时间和夹带剂为实验因素，通过对实验前后样本在重量、厚度、弯曲强度和断裂强度四方面变化的分析考察了各实验因素对实验效果的影响。实验结果表明，影响超临界CO₂法回收印刷线路板的最主要因素为温度、时间和夹带剂，超临界CO₂法回收废弃印刷线路板的最佳工艺条件：温度270℃，压强大于7.38 MPa，时间3 h，夹带剂(水)160 mL。实验进一步验证了压强对实验结果的非显著性影响。     

Remobilization of polycyclic aromatic hydrocarbons during the resuspension of Yangtze River sediments using a particle entrainment simulator

Remobilization of 16 polycyclic aromatic hydrocarbons (PAHs) during sediment resuspension was investigated using a particle entrainment simulator at shear stress from 0.2 to 0.5Nm(-2), typical of the energy levels present in many tidally driven aquatic environments. The results suggested that desorption from the entrained particles was the primary source of dissolved PAHs. summation operatorPAHs concentrations in particles on volume normalization increased about four times. However, on mass weight basis, summation operatorPAHs concentrations decreased from 6039.74+/-138.28microgkg(-1) to 1665.39+/-112.26microgkg(-1). The same trend was observed for individual PAHs. Dissolved concentrations of PAHs demonstrated significant differences depending on molecular weight and applied shear. The distribution of PAHs between particle and water phase suggested that for three-ring PAHs, the amounts of PAHs in particles were higher than the predicted values during our experiments. This might be due to presence of another active sorbent.     

湿地生态环境需水量研究

分析了湿地生态环境需水量的内涵和临界阈值。探讨了湿地生态环境需水量计算方法和相关指标，对湿地生态需水量和环境需水量各种类型的主要特点，存在特征和关键指标进行了系统剖析，特别对湿地植物需水量，土壤需水量，野生生物栖息地需水量，补水需水量，防止盐水入侵需水量，防止岸线侵蚀及河口生态环境需水量，净化污染物需水量等计算方法和理论模型进行了探讨。     

热带海洋环境中BHC和DDT的行为特征研究Ⅰ.中国珠江口区旱季BHC和DDT的含量与分布

本文于1994年11月用气相色谱法研究了旱季珠江口区环境中BHC和DDT的含量与分布。结果表明，表层海水BHC含量为0.187μg/L，DDT为0.080μｇ/L；底层海水BHC为0.117μｇ／L，DDT为0.506μｇ／L。沉积物BHC为11.15×10－9（干），DDT为33.46×10－9（干）。海水中的盐度、DO、C     

基于指标体系的地下水环境承载力评价

在分析可持续发展指标体系及模型研究的基础上，对地下水环境承载力问题进行了探讨，并提出了相应的指标与模型，通过实全对两个模型进行了进一步阐释。结果表明，模糊优选模型较系统学模型更能反映问题的实质，结果亦更具说服力。     

明渠潮流中垂向紊动射流流场的数值模拟

选用ｋ－ε双方程紊流模型，对自由水面做“动”刚盖假设，建立了明渠潮流中垂向射流流场的数学模型，根据潮汐流动返复回荡的特点，对离散方程组的求解采用“跟踪扫描”逐行求解法，保护和加快了解的收敛，计算了５种不同回荡周期情况下射流流场的变化过程，预报回流区高度与实测值吻合。分析了潮汐非恒定性的影响，获得了一些有益的结论。     

废旧家用空调器的回收及关键技术研究

家用空调器等废旧家电的回收再利用，对全球的可持续发展具有重要意义，已受到国内外的高度重视。文章介绍了一般废旧家用电器的回收过程、回收方法，并对废旧家用空调器的回收过程做了具体介绍，最后提出了家用空调器等废旧家电的回收再利用过程中的关键技术。     

环境影响评价中的多方案比选研究

在环评中多方案比选实践的基础上,查阅了大量的资料,比较了国内外多方案比选的研究现状,总结了中国环评中多方案比选研究的不足,阐述了多方案比选的技术经济评价方法、环境社会评价方法及综合评价方法的内容及步骤.重点介绍了应用层次分析法解决多目标决策问题,对环评中多方案比选研究作了一些有益的探索.