Exploitation of gold in an historic sewage sludge stockpile, Werribee, Australia: resource evaluation, chemical extraction and subsequent utilisation sludge     

S. J. Reeves  I. R. Plimer 《Journal of Geochemical Exploration》2001,72(1)

Sewage sludges are potential targets for economic extraction of Au because of the documented Au content of sewage sludges worldwide, which are of the order of some ore deposits currently mined for Au. The sewage of Melbourne, Australia, was stockpiled in large, closed, lagoonal tanks from 1898 until 1980. Reeves, Plimer and Foster, 1999, have conducted, and published, an extensive and exhaustive study of the Werribee sewage reserves utilising RNAA, INAA, GFAAS, ICPMS, and FLAAS to determine 31 elements, including Au, Ag, Sb, As, Cd, Hg, Zn, Cu, and Pb. The study was initiated to determine Au, Ag and other metal variations in both space and time and to investigate the economics of chemical extraction of the precious metals. A total of 149 samples from over 50 hand-auger drillholes to a depth up to 4m were analysed from the stockpiles, with Au assays yielding remarkably consistent results. Average grades of 0.77 g/t Au and 18.8 g/t Ag have been documented for a measured resource of 770,000 m³. Laboratory-based extractive metallurgy of the Werribee sludges has demonstrated that Au, Ag, and Zn can be removed with relative ease by heap-leaching using modified conventional technology, albeit with prohibitive reagent consumption. The extraction of the precious metals also results in the variable removal of contaminant metals such as Cd, As, Sb, Hg and Cr which may render the sludges fit for sale as agricultural fertiliser, provided organic pollutants and pathogenic organisms are below governmental environmental protection limits.  相似文献   

垃圾土的渗透特性试验   总被引：3，自引：0，他引：3  

介玉新  旦增顿珠  魏弋峰 《岩土工程技术》2005,19(6):307-310

用取自京郊某垃圾堆填场的垃圾土样进行渗透试验,比较不同密度情况下渗透系数的差别。试验中同时记录了渗透系数随时间的变化情况。试验结果表明,垃圾土的渗透系数随密度的不同,可以在(10-3~10-7)cm/s之间变动。试验中也发现垃圾土的渗透系数随时间而逐渐减小,大约6天左右趋于稳定。对垃圾土的渗透系数室内试验测定应以观测7天时间为宜。  相似文献   

Characteristics of trace elements in contaminated rivers and their environmental significance     

Xuyin YUAN Zhiyong SHEN Xu DENG Yun GAO 《中国地球化学学报》2006,25(B08):140-141

Several rivers researched around Taihu Lake in Chinese eastern plain are distributed to the west of the lake. Pollutants of different types from tributaries and inlets flow directly into the main rivers and finally into the lake. They change trace elements of rivers fi＇om which we can analyze. Researches about trace elements are helpful for understanding the pollutant characteristics, industrial structure and agricultural cultivation in the area of network rivers in the plain of China. Samples of water column, suspended matter and sediment were collected fi＇om the west rivers of Taihu Lake, which represent three typical rivers. Observation in the field and the primary composition analysis showed the Caoqiao River was mainly contaminated by industrial wastewater, the Liangxi River was discharged by domestic sewage and the Dapu River was principally input by farmland runoff. REE concentrations and their normalized curves showed obvious characters for rivers discharged by different sewages. The contents of total REE in water column followed the order of the Caoqiao River, the Dapu River and the Liangxi River fi＇om high to low. TREEs in suspended matter and sediments follow the order of the Dapu River 〉 the Caoqiao River 〉 the Liangxi River. REE normalized curves （for Australia shale） suggested that significant diversities were presented in water column, suspended matter and sediments, i.e., heavy REE enrichment in water, middle REE enrichment in suspended matter, and smooth curves for sediments. But the heavy pollution resulted in several anomalous curves in the same rivers. Some element ratios were selected as indices for polluted rivers based on their geochemical properties and diversities between rivers. The results displayed the discriminative indices for water column, suspended matter and sediment. The effective indices were Pb/Fe, Cr/Fe, Ni/Fe, Pb/Ni, Zn/Ni for water column, Cu/Al, Cu/Fe, Zn/Fe, K/Ca, K/Na, Pb/Co, Zn/Co for suspend matter and Pb/Fe, K/Ca, Ca/Mg, Zn/Ni for sediment, respectively. In general, rivers mainly discharged by industrial sewage have high ratios of Pb/Ni, K/Ca, are enriched in the middle REE and have positive Gd anomaly. The domestic sewage flowing into rivers reveals high ratios of Zn/Ni, Pb/Fe, and is enriched in the heavy REE, and has the positive Eu anomaly. If runoff of farmland enters into the rivers, it will have high ratios of Ca/Mg, K/Na, high lanthanum, and show the smooth normalized curves of REE.  相似文献   

粘土水泥固化浆液在某垃圾卫生填埋场防渗帷幕注浆工程中的应用     

周立新 《化工矿产地质》2006,28(4):251-254

城市垃圾卫生填埋场对防渗帷幕注浆的要求较高,单纯的水泥注浆,由于水泥颗粒较粗、水泥浆液凝固时的析水率较高、水泥固结体抗酸稳定性较差,很难满足设计对防渗的要求．采用粘土水泥固化浆液相关性能均能满足垃圾填埋场防渗帷幕的要求。在长沙市垃圾卫生填埋场中应用实践行之有效,为此类帷幕注浆工程提供了一种较好的注浆方法。  相似文献   

GIS环境下污水管网设计流量的快速计算     

孟令奎  边馥苓  刘玉贤 《武汉大学学报(信息科学版)》1997,(1)

针对ＧＩＳ环境下污水管网设计问题，提出了一种快速计算管段设计流量的方法——递归方法。分析了递归的原理、链式表的建立以及递归算法的具体实现等，并以实例阐述了递归计算的各个步骤  相似文献   

污水泵浓盐水示踪测流研究          下载免费PDF全文

郭建斌  张庆五  吴海波  郭智成 《水科学进展》2003,14(5):643-646

针对污水泵流量监测中常规测流方法的缺点,结合工程实践,研究浓盐水示踪法在污水泵流量监测中的可行性,提出该方法适于在低背景盐浓度下污水的测流;观察激励信号、温度等对测流结果的影响,给出修正方法;利用计算机采集技术,提高方法的准确性、实时性。  相似文献   

δ15N在污水生物脱氮机理研究中的应用     

刘贤荣  闫秀懿  张永祥 《吉林地质》2003,22(1):54-57,82

近年来,硝酸盐氮的污染愈来愈严重.无论是地表水还是地下水都受到不同程度的氮污染.控制氮污染及处理氮污染问题已经提到我国水污染控制的议事日程.本文探索微生物处理含氮污水的过程中反硝化作用的脱氮机理,使用δ15N标识技术研究水体中三氮运移转化过程中的质量不守恒,证明δ15N标识技术研究确定不同形态氮的数量各系是可行的.研究水体中三氮质量不守恒现象,将解决含氮污水生物净化中污泥上浮问题、氮污染含水层生物修复中气阻问题.  相似文献   

城市缓流水体污染成因分析及维护对策   总被引：17，自引：0，他引：17       下载免费PDF全文

朱亮  蔡金榜  陈艳 《水科学进展》2002,13(3):383-388

在讨论城市缓流水体的运移特征、水化学过程及污染源的基础上,提出了建立科学的城市水务管理体制,城市水利工程与生态工程建设相结合,充分发挥水系工程在城市水体环境保护中的作用,以及完善暴雨污水综合治理方法等保护城市缓流水体的对策.  相似文献   

天子岭垃圾填埋场有机物降解规律的研究   总被引：11，自引：2，他引：11  

张振营  吴世明  陈云敏 《岩土力学》2002,23(1):60-62

通过对杭州天子岭垃圾填埋场3个钻孔、32点的室内试验结果，研究了填埋场中有机物的含量、有机物随深度的变化规律。研究表明：有机物含量与埋深及埋深的自然对数值成直线关系，这些结论为研究城市垃圾填埋场的压缩变形规律提供了依据。  相似文献   

上海老港垃圾卫生填埋场隔离墙材料特性室内试验研究   总被引：1，自引：0，他引：1  

费培云  季嵘  张道玲  徐超  李志斌 《上海国土资源》2005,(4):51-53,70

为了控制垃圾渗滤液的侧向渗透,在城市垃圾卫生填埋场四周需设置垂直隔离墙。隔离墙采用现场开挖深槽,然后在槽内灌注水泥一膨润土一砂混合浆液的方法构筑。通过室内配比试验的方法,测定不同配比试件的无侧限抗压强度、渗透系数等参数,为隔离墙的施工提供合理的配比。  相似文献