粉煤灰--Fenton法处理酸性红印染废水

以美尔雅酸性红废水为研究对象 ,采用粉煤灰—Fenton法进行处理研究。确定了絮凝剂及其最佳浓度、粉煤灰和Fenton试剂处理的最佳条件。经处理后废水COD的去除率达 97%以上 ,色度去除率达 99%以上。     

壳聚糖/CTAB复合改性膨润土对活性红X-3B的吸附

以壳聚糖和十六烷基三甲基溴化铵(CTAB)为改性剂,制备了复合改性膨润土,并利用傅里叶红外光谱仪(FTIR)和X射线衍射(XRD)对其进行表征,研究了该改性膨润土对活性红X-3B的吸附效果.结果表明:壳聚糖能插入CTAB改性膨润土层间;当复合改性膨润土投加量为5 g·L~(-1),pH为3时,其对活性红X-3B的去除率可达99.15%;吸附过程符合拟二级动力学方程;吸附行为适于用Langmuir吸附等温方程描述.由吸附热力学方程计算得到,吸附焓变ΔH0,吸附自由能变ΔG0,吸附熵变ΔS0,表明吸附为放热和熵减少的自发过程.复合改性膨润土稳定性受搅拌时间和温度的影响不明显,pH较低(pH3)时稳定性会降低.通过Zeta电位分析认为,静电作用为吸附的主要机理.经过6次吸附/再生后,改性膨润土对活性红X-3B的去除率仍在60%以上,表明复合改性膨润土具有较好的重复利用性.研究表明,该复合改性膨润土是一种对水体中活性红X-3B具有良好吸附能力的吸附剂.     

象山港赤潮监控区水质状况的动态变化

根据2002年4～9月份象山港赤潮监控区水质监测基础资料,建立表、底层DO、COD、DIN、DIP以及水质指数(A)和富营养化状态指数(E)时间序列,运用变异系数和相关分析法,探讨了象山港赤潮监控区在赤潮多发期水质状况的动态变化特征。分析结果表明：在赤潮多发期,监控区水质有机污染程度和富营养化状态较严重,明显呈低P高N状态;各环境参数的动态变化存在着明显差异;各环境参数对水质有机污染程度和富营养化状态的贡献也存在显著差异,且赤潮监控区水质富营养化指数与水质指数之间呈显著的正相关关系。     

赤潮浮游植物种类和数量分析的研究进展

简要介绍了浮游植物种类和数量分析的8种方法的研究进展、应用现状,比较了各种方法的特点。基于浮游植物的外观形态特征而进行分析的方法除了传统的显微镜方法外,与计算机技术相结合的图像法使分析速度得以提高。基于浮游植物的色素组成而进行分析的有吸光光度法、荧光分光光度法和高压液相色谱法,可分至门类,同时定量,其中光度法可以直接测量海水,高压液相色谱法需萃取色素。流式细胞仪法的特点是可同时测量每个细胞的多个参数,运用神经网络分析可鉴别种类,应用时主要受限于仪器的操作和价格;化学发光流动注射法目前仅限于特定赤潮浮游植物的检测;分子探针法基于浮游植物的DNA特征,处于实验室研究阶段。     

好氧颗粒污泥对酸性红B的生物吸附模型研究

考察了灭活好氧颗粒污泥吸附酸性红B的吸附等温线、吸附动力学和热力学.结果表明,Langmuir和Redlich-Peterson比Freudlich吸附等温线更符合试验数据,20 ℃时Langmuir最大单分子层吸附量为123.46 mg/g.吸附动力学符合准2级动力学模型.灭活AGS内部扩散过程用Webber-Morris模型拟合,结果表明颗粒内部扩散过程是限速步骤,但边界层扩散和动力学阻力亦不能忽略.热力学分析表明,吸附过程是吸热且自发的过程.     

基于APCS-MLR和PMF模型的赤泥堆场周边耕地土壤重金属污染源解析

为探究重庆某赤泥堆场周边耕地土壤重金属污染特征和来源,分析土壤中8种重金属元素（Cd、Cr、Hg、Ni、Pb、As、Cu和Zn）含量和空间分布特征,利用单因子污染指数法和内梅罗综合污染指数法对土壤重金属污染特征进行评价,并在相关性分析的基础上采用APCS-MLR和PMF模型定量解析重金属来源.结果表明,除土壤Cr外,其他7种重金属元素含量均值均高于重庆市土壤背景值.土壤重金属整体处于中度污染水平,其中Cd、Hg和As为中度污染,Pb、Cu、Ni和Zn为轻度污染.土壤Cr、Ni、Pb、Cu和Zn空间分布格局相似,相互间呈极显著正相关（P < 0.01）;Cd、Hg和As空间分布特征有较大差异,且相互间相关性不显著（P > 0.05）.源解析表明,研究区土壤重金属来源较为复杂,APCS-MLR和PMF模型均能解析出4种相同的污染源,分别为赤泥堆场渗滤排放和自然来源、火力发电排放源、农业活动与自然来源和有色金属冶炼排放源.两种模型源解析结果差异较小,APCS-MLR模型中4种污染源贡献率分别为51.8%、18.0%、15.9%和14.3%,而在PMF模型中分别为45.9%、12.8%、21.5%和19.8%.     

赤泥基纳米零价铁对多金属污染土壤修复效果

为实现重金属复合污染（Pb、Zn、Cu和Cd）土壤同步修复,构建土壤-小白菜体系,探究赤泥（RM）、纳米赤泥（RMn）以及纳米赤泥负载纳米零价铁（RMn-nZVI）这3种不同赤泥基钝化剂对Pb、Zn、Cu和Cd复合污染土壤的修复效果与机制,并考察土壤中Pb、Zn、Cu和Cd形态分布对小白菜积累Pb、Zn、Cu和Cd的控制作用.结果显示,3种钝化剂施用可显著提高土壤pH,降低土壤酸可提取态（F1）Pb、Zn、Cu和Cd含量,增加残渣态（F4）含量,最终钝化效果表现为：RMn-nZVI>RMn>RM.此外,3种钝化剂显著降低了小白菜可食用部分Pb、Zn、Cu和Cd的积累,其中RMn-nZVI处理下降低程度最高,Pb、Zn、Cu和Cd含量分别下降35.11%、45.05%、69.52%和59.63%.结果表明,纳米赤泥负载纳米零价铁新型钝化材料在重金属复合污染土壤修复领域具有一定的应用潜力.     

基于FBM法追踪秦皇岛海域赤潮迁移扩散

在Delft3D-FLOW模型模拟水动力的基础上,基于FBM粒子追踪法建立和验证赤潮迁移扩散模型.模拟了秦皇岛海域潮流和风生流,分析了风生流对赤潮迁移扩散的作用,对比分析了FBM法、拉格朗日法和常规布朗运动法在赤潮迁移扩散模拟中的特性,测试了模型Hurst指数的敏感性并得出其在赤潮模拟中的合理取值范围.主要结论为：①秦皇岛海域的赤潮主要随潮流的涨落而往复移动,一个涨落潮周期内赤潮的净迁移距离较小;②秦皇岛海域夏季潮流较弱,但风对赤潮迁移具有一定影响,易产生东北向风生流,导致赤潮更易往东北方向迁移;③Hurst指数较明显地影响粒子云的扩散范围,Hurst指数取0.80±0.03能比较真实地模拟秦皇岛海域赤潮的迁移扩散;④FBM法可模拟赤潮的non-Fickian扩散现象,使其模拟的粒子云扩散范围和分布形状明显优于拉格朗日法和常规布朗运动法.     

Adsorptive removal of Drimarine Red HF-3D dye from aqueous solution using low-cost agricultural waste: batch and column study

This study involves the utilisation of peanut husk for the removal of Drimarine Red HF-3D dye from aqueous solutions. Batch study experiments were conducted with native, HNO₃-treated and Na-alginate-immobilised peanut husk biomass. Maximum dye removal (95.24 mg/g) was obtained with HNO₃-treated biomass. The experimental data were successfully explained with a pseudo-second-order kinetic model for all types of biosorbents. The equilibrium data fitted well to the Freundlich adsorption isotherm model. A thermodynamic study was also carried out to check the nature of the adsorption process. A fixed-bed column study for Drimarine Red HF-3D was carried out to optimise the effect of bed height, flow rate and initial dye concentration using peanut husk biomass. The column study showed that biosorption capacity increased with the increase in initial dye concentration and bed height, but decreased with increased flow rate. Data for Drimarine Red HF-3D were in very good agreement with the bed depth service time model. Fourier transform infrared analysis demonstrated the involvement of different functional groups in dye biosorption. These results showed that peanut husk biomass possessed good potential for the removal of Drimarine Red HF-3D from aqueous solution.     

Roe and red deer as bioindicators of heavy metals contamination in north-western Poland

The present paper examines the degree of environmental contamination in areas covered by the Natura 2000 programme, located in north-western Poland, with selected heavy metals based on their concentration in target organs of roe and red deer. Lead, cadmium, copper, iron, and zinc concentrations were determined by inductively coupled plasma–atomic emission spectrometry. Residues of lead and cadmium were found in most of the analysed samples of roe and red deer organs The concentration of cadmium in the organs of the animals studied was much higher than that of lead. The median for Pb in liver and kidneys was 0.055 and 0.092 μg/g dry weight (d.w.) in roe deer, and 0.067 and 0.081 μg/g d.w. in red deer, respectively. The median for liver and kidney cadmium was 0.770 and 6.139 μg/g d.w. in roe deer, and 0.422 and 6.365 μg/g d.w. in red deer, respectively. Our study has demonstrated that this area is laden with lead and cadmium. This is evidenced by the fact that maximum permissible levels of these elements in the organs of red and roe deer, which were used as bioindicators of environmental contamination, were exceeded.