地表沉陷治理的新方法

最近,兖州矿业(集团)公司济宁二号煤矿在四采区应用覆岩离层注浆技术,减沉效果相当明显,取得了良好的效果.     

燃煤锅炉烟气氨法脱硫技术的应用

电厂燃煤锅炉烟气脱硫是减少和控制酸雨的有效手段。LS氨法喷雾脱硫技术具有脱硫效率高、环境效益好、资源综合利用的特点。以合成氨生产装置回收的低浓度氨水为吸收剂,实施锅炉烟气脱硫技术改造．取得良好的应用效果。     

Impact of dynamic distribution of floc particles on flocculation e ect

Polyaluminum chloride (PAC) was used as coagulant and suspended particles in kaolin water. Online instruments including turbidimeter and particle counter were used to monitor the flocculation process. An evaluation model for demonstrating the impact on the flocculation effect was established based on the multiple linear regression analysis method. The parameter of the index weight of channels quantitatively described how the variation of floc particle population in different size ranges cause the decrement of turbidity. The study showed that the floc particles in different size ranges contributed differently to the decrease of turbidity and that the index weight of channel could excellently indicate the impact degree of floc particles dynamic distribution on flocculation effect. Therefore, the parameter may significantly benefit the development of coagulation and sedimentation techniques as well as the optimal coagulant selection.     

高钙特征焚烧飞灰的加速碳酸化处理及对重金属浸出特性的影响

针对生活垃圾焚烧飞灰的高钙含量特征,在室温下采用CO2对焚烧飞灰在液固比(L∶S)为0.25∶1的条件下进行加速碳酸化处理,考察加速碳酸化处理对焚烧飞灰中重金属(As、Cd、Cu、Zn、Sb、Pb)浸出特性的影响.焚烧飞灰XRD分析表明,加速碳酸化处理后飞灰中的Ca(OH)2和CaClOH衍射峰消失,而CaCO3的衍射峰增多,且强度增加.加速碳酸化处理后飞灰中铅的形态发生了改变,并且能够检测到铜的化合物.TG/DTA分析表明,焚烧飞灰在440℃之前增重达到5.70%,SEM-EDS分析证实了Ca(OH)2(s)+CO2(g)→CaCO3(s)反应的发生.焚烧飞灰加速碳酸化处理后的TCLP浸出实验表明,碳酸化时间在2 h内,重金属的浸出浓度除Cd保持不变外都显著下降;而当碳酸化时间超过50 h后,重金属的浸出浓度除Pb外普遍高于飞灰未经碳酸化处理时的浸出浓度.     

VFSMOD模型对植被过滤带净化效果的模拟与适应性分析

在简述Vegetative Filter Strips Model(VFSMOD)模型的功能和机制的基础上,通过野外小区试验资料检验该模型对国内植被过滤带净化效果的模拟情况,进而分析其适用性.结果表明,出流水量模拟值与实测值的偏差多在±15%以内,出流SS浓度模拟值与实测值的偏差多在±20%以内,出流水量和出流SS浓度模拟值与实测值的判定系数R2分别为0.995和0.889,模型具有较高的精度与较强的适应性,可用于植被过滤带的规划设计.     

不同设置方式下的防风网抑尘效果对比

为对比防风网不同设置方式对露天堆场起尘的影响,以某露天煤堆场为例,结合现场实测数据对数值计算方法进行了验证,并根据实际堆场设计了4种设网方案。通过计算各料堆表面摩阻风速的分布,统计出了各方案下的全年起尘率。结果表明：当防风网呈＂口＂型设置时,抑尘效果最好;沿全年主导风向上方向呈＂L＂型设置时,抑尘效果最差。比较＂П＂型...     

Treatment of taste and odor causing compounds 2-methyl isoborneol and geosmin in drinking water: A critical review

Problems due to the taste and odor in drinking water are common in treatment facilities around the world. Taste and odor are perceived by the public as the primary indicators of the safely and acceptability of drinking water and are mainly caused by the presence of two semi-volatile compounds – 2-methyl isoborneol (MIB) and geosmin. A review of these two taste and odor causing compounds in drinking water is presented. The sources for the formation of these compounds in water are discussed alongwith the health and regulatory implications. The recent developments in the analysis of MIB/geosmin in water which have allowed for rapid measurements in the nanogram per liter concentrations are also discussed. This review focuses on the relevant treatment alternatives, that are described in detail with emphasis on their respective advantages and problems associated with their implementation in a fullscale facility. Conventional treatment processes in water treatment plants, such as coagulation, sedimentation and chlorination have been found to be ine ective for removal of MIB/geosmin. Studies have shown powdered activated carbon, ozonation and biofiltration to be e ective in treatment of these two compounds. Although some of these technologies are more e ective and show more promise than the others, much work remains to be done to optimize these technologies so that they can be retrofitted or installed with minimal impact on the overall operation and e ectiveness of the treatment system.     

行人过街设施节能减排效果评价研究及应用

随着环境质量的恶化与资源的耗竭,对城市规划中交通基础设施节能减排效果的评价愈显重要。文章提出了一套行人过街设施节能减排效果评价方法。该方法以能源的消耗量与污染物的排放量为评价指标,建立了行人过街设施节能减排效果评价模型。通过将微观仿真技术(PARAMICS)与机动车综合排放模型(CMEM)结合,构建了微观交通尾气模拟分析平台,获取了动态的污染物排放量与燃油消耗量,实现了节能减排效益的定量预评估。最后,以广州一处人行天桥修建为例进行节能减排效果评价,发现人行天桥的修建将会使天桥附近路段尾气排放综合降低82.6%、油耗降低80%,一年减少经济损失约90万元;将研究结果与天桥建成前后实测数据对比,所得结果趋势一致,这表明文章提出的方法是合理的、有效的。     

超声波-臭氧破解剩余污泥技术的初步研究

剩余污泥的处理与处置是我国和世界面临的重要环境课题.文章初步研究了臭氧、超声波及其组合工艺对剩余污泥的破解作用,考察了反应时间、臭氧流量、超声功率对污泥破解效果的影响.研究表明:臭氧流量为7I/min时破解效果最好,反应40min,SCOD、NH3-N、TN和TP分别比反应前提高了586%、178%、522%和1781...     

氮形态对人工湿地氮去除效果的影响

采用水平潜流人工湿地处理TN质量浓度为20～25 mgL,氮形态分别以NH4+-N,NO3--N和有机氮为主的生活污水,分析了氮形态时人工湿地N去除效果的影响.试验结果显示:相应的TN去除率分别为47.2%,71.6%和33.1%.表明人工湿地主要适用于水的深度处理,实现污水中N的无机化特别是将N转化为NO3--N,可显著提高人工湿地的N去除效果.