Biosorption of Direct Black 38 by dried anaerobic granular sludge

The biosorption of Direct Black 38 by dried anaerobic granular sludge in a batch system under specific temperatures and initial pH was investigated. The adsorption reaction is pH dependent with higher removal at low pH. The adsorption equilibrium data fit very well with both Langmuir and Freundlich models in the concentration range of Direct Black 38 at all chosen temperatures. The adsorption parameters show that the adsorption of Direct Black 38 is an endothermic and more effective process at high temperatures. The kinetics of adsorption was found to be second order and adsorption rate constants increased with increasing temperature. Activation energy was determined as 26.8 kJ/mol for the process. This suggests that the adsorption of Direct Black 38 by dried anaerobic granular sludge is chemically controlled.     

Determination of the dissociation constants of polyepoxysuccinic acid

The dissociation constants of polyepoxysuccinic acid (PESA) were investigated in this study. Based on the potentiometric titration and the BEST program, the dissociation constants of PESA were determined. Considering the complexity of the dissociation of PESA in aqueous solution, several models were constructed to simulate the dissociation process of PESA. By comparison, the dissociation constants of PESA were obtained with model 4. The species distribution of PESA in aqueous solution as a function of pH was also presented according to the experimental and calculation results. It showed that the H₂L model with five basic structure units to describe the dissociation of PESA was reasonable, and the relevant constants had less error and better matching between the experimental and calculation data. The corresponding values of pK _ai were 4.68 and 4.92, respectively, for H₂L at 35°C with ionic strength of 0.1 mol/L.     

废水催化湿式氧化稀土金属氧化物催化剂的研制

采用共沉淀法制得锰铈复合氧化物催化剂,催化湿式氧化处理高浓度苯酚废水。通过正交实验筛选催化剂制备条件,单因素实验优化制得催化剂。研究了CWAO处理废水条件下的金属离子溶出和催化剂的表征。结果表明,该催化剂在低温低压条件下具有优良的湿式氧化催化活性,且金属离子溶出量低,是一种CWAO处理高浓度有机废水中极具应用前景的新型高效催化剂。     

稳定同位素技术在河岸带功能研究中的应用

简要概述稳定同位素技术在生态学的应用领域,通过对河岸带反硝化作用限制因素、效率以及机理的回顾,体现稳定同位素技术应用的优势。重点阐述该技术在研究河岸带功能实现机理、分析河岸带生态系统物质来源和时空迁移转化规律以及研究河岸带与外界环境物质联系,生态系统食物网络组成及营养级关系中的应用,指出其能够科学反映物质空间变化和时间累积效应的特点。稳定同位素技术与传统地球化学技术的结合对国内河岸带功能研究以及生态河岸带建设具有重大的实际应用价值。     

Seasonal variation effects on the formation of trihalomethane during chlorination of water from Yangtze River and associated cancer risk assessment

For the system of water samples collected from Yangtze River,the effects of seasonal variation and Fe(III) concentrations on the formation and distribution of trihalomethanes (THMs) during chlorination have been investigated.The corresponding lifetime cancer risk of the formed THMs to human beings was estimated using the parameters and procedure issued by the US EPA.The results indicated that the average concentration of THMs (100.81 μg/L) in spring was significantly higher than that in other seasons,which ...     

中铝山西分公司排污措施及控制

简要介绍了中铝山西分公司的建设与发展状况,重点介绍了其环境保护措施及排污达标和总量控制情况。同时解释了“可持续发展”理论和总量控制的概念。通过一、二期工程必须削减污染物排放量和正在建设中的三期工程采取先进的生产技术和环境保护措施,说明排污达标和总量控制是保护环境的有效措施,是促进中铝山西分公司“可持续发展”的关键。     

酚酸类有机化工废水处理技术

酚酸废水是典型的难降解有毒有机化工废水之一。在分析中 ,综述了我国酚酸类有机化工废水的几种主要处理技术及应用情况 ,指出了酚酸废水处理技术的发展方向     

Occurrence and risk assessment of trace metals and metalloids in sediments and benthic invertebrates from Dianshan Lake,China

Environmental Science and Pollution Research - The present study measured concentrations of Cr, Ni, Cu, Zn, As, Cd, Sb, and Pb in surface sediments and two benthic invertebrate species (Anodonta...     

湿式氧化再生活性炭研究进展

重点介绍了近年来发来的湿式氧化再生活性炭技术的发展和基本探讨了影响活性再生率效率的主要技术参数。以及再生过程中动力学研究现状。     

Characterization of dissolved organic matter in urban sewage using excitation emission matrix fluorescence spectroscopy and parallel factor analysis

Wastewater dissolved organic matter (DOM) from different processing stages of a sewage treatment plant in Xiamen was characterized using fluorescence and absorption spectroscopy. Parallel factor analysis modeling of excitation-emission matrix spectra revealed five fluorescent components occurring in sewage DOM: one protein-like (C1), three humic-like (C2, C4 and C5) and one xenobiotic-like (C3) components. During the aerated grit chamber and primary sedimentation tank stage, there was only a slight decrease in fluorescence intensity and the absorption coefficient at 350 nm (a350). During the second aeration stage, high concentration of protein-like and short-wavelength-excited humic-like components were significantly degraded accompanied by significant loss of DOC (80%) and a350 (30%), indicating that C1 and C2 were the dominant constituents of sewage DOM. As a result, long-wavelengthexcited C4 and C5 became the dominant humic-like components and the DOM molecular size inferred from the variation of spectral slope S (300–650 nm) and specific absorption (a280/DOC) increased. Combination use of Fmax of C1 and the ratio of C1/C5, or a350 may provide a quantitative indication for the relative amount of raw or treated sewage in aquatic environment.