Chemical and Bacterial Quality of Aeration-Type Waste Water Treatment System Discharge     

Samuel V. Panno  W.R. Kelly  K.C. Hackley  C.P. Weibel 《Ground Water Monitoring & Remediation》2007,27(2):71-76

  相似文献   

Geochemistry of extremely alkaline (pH>12) ground water in slag-fill aquifers     

Roadcap GS  Kelly WR  Bethke CM 《Ground water》2005,43(6):806-816

Extremely alkaline ground water has been found underneath many shuttered steel mills and slag dumps and has been an impediment to the cleanup and economic redevelopment of these sites because little is known about the geochemistry. A large number of these sites occur in the Lake Calumet region of Chicago, Illinois, where large-scale infilling of the wetlands with steel slag has created an aquifer with pH values as high as 12.8. To understand the geochemistry of the alkaline ground water system, we analyzed samples of ground water and the associated slag and weathering products from four sites. We also considered several potential remediation schemes to lower the pH and toxicity of the water. The principal cause of the alkaline conditions is the weathering of calcium silicates within the slag. The resulting ground water at most of the sites is dominated by Ca2+ and OH- in equilibrium with Ca(OH)2. Where the alkaline ground water discharges in springs, atmospheric CO2 dissolves into the water and thick layers of calcite form. Iron, manganese, and other metals in the metallic portion of the slag have corroded to form more stable low-temperature oxides and sulfides and have not accumulated in large concentrations in the ground water. Calcite precipitated at the springs is rich in a number of heavy metals, suggesting that metals can move through the system as particulate matter. Air sparging appears to be an effective remediation strategy for reducing the toxicity of discharging alkaline water.  相似文献   

Geotechnical properties of municipal sewage sludge   总被引：3，自引：0，他引：3  

Brendan C. O’Kelly 《Geotechnical and Geological Engineering》2006,24(4):833-850

The geotechnical properties of municipal sewage sludge, in particular those pertinent to the handling and landfilling of the material, are presented. Index, drying, compaction, shear strength and consolidation tests were conducted on the material at different states of biodegradation. The organic content and specific gravity of solids were found to be inversely related, with typical organic contents of 50–70% and specific gravity of solids values of 1.55–1.80. The density of the compacted material was low in comparison with mineral soils. Standard Proctor compaction yielded a maximum dry density of 0.56 tonne/m³ at 85% water content. Laboratory vane-shear and triaxial compression tests indicated that, below about 180% water content, the shear strength of the sludge material increased exponentially with reducing water content. Consolidated-undrained triaxial compression tests on the pasteurised sludge material indicated an effective angle of shearing resistance of 32° for the moderately degraded material and 37° for the strongly degraded material. Biogas was produced at rates of up to 0.33 L/day/kg slurry due to ongoing biodegradation and the resulting pore pressure response must be taken into account in any stress analysis. Consolidation tests using the hydraulic consolidation cell, oedometer and triaxial apparatus indicated that the sludge material was highly compressible although practically impermeable, for example the coefficient of permeability for the moderately degraded slurry was of the order of 10⁻⁹m/s. However, creep deformation was significant with typical coefficient of secondary compression values of 0.02–0.08 for the compacted material. A more free-draining material was produced at higher states of biodegradation.  相似文献   

The SuperCOSMOS Sky Survey – I. Introduction and description     

N.C. Hambly  H.T. MacGillivray  M.A. Read  S.B. Tritton  E.B. Thomson  B.D. Kelly  D.H. Morgan  R.E. Smith  S.P. Driver  J. Williamson  Q.A. Parker  M.R.S. Hawkins  P.M. Williams  A. Lawrence 《Monthly notices of the Royal Astronomical Society》2001,326(4):1279-1294

  相似文献   

The Gemini Multiobject Spectrographs     

J. Allington-Smith  P. Bettess  E. Chadwick  R. Content  R. Davies  G. Dodsworth  R. Haynes  D. Lee  I. Lewis  J. Webster  E. Atad  S. Beard  R. Bennett  J. Harris  P. Hastings  D. Kelly  T. Paul  M. Strachan  P. Williams  T. Bond  D. Crampton  T. Davidge  B. Leckie  C. Morbey  R. Murowinski  S. Roberts  L. Saddlemyer  J. Sebesta  J. Stilburn  K. Szeto 《Experimental Astronomy》1997,7(4):293-299

  相似文献   

A Comparison of Seismic Array Processing Methods     

P. E. Green Jr.  E. J. Kelly  Jr.  M. J. Levin 《Geophysical Journal International》1966,11(1):67-84

  相似文献   

Temporal Variability of Iron Speciation in Coastal Rainwater     

Joan D. Willey  Robert J. Kieber  Kelly H. Williams  Jamie S. Crozier  Stephen A. Skrabal  G. Brooks Avery Jr. 《Journal of Atmospheric Chemistry》2000,37(2):185-205

Iron occurs in rain as particulateand dissolved Fe and includes both Fe(II) and Fe(III)species. Model calculations and correlation analysisindicate Fe(II)(aq) occurs almost exclusively as thefree ion whereas Fe(III)(aq) occurs as both ironoxalate and Fe(OH)₂ ⁺(aq) with largevariations over the pH range from 4.0 to 5.0. Complexation with humic-like compounds may also beimportant for Fe(III)(aq); however, the concentrationand structural characteristics of these compounds haveyet to be determined. 112 rain samples were collectedfor iron analysis in Wilmington, North Carolina,between 1 July 1997, and 30 June 1999. Total iron,particulate iron and Fe(III)(aq) were higher inconcentration in summer and spring rain relative towinter and autumn rain. Fe(II)(aq) concentrations, incontrast, did not vary seasonally. Particulate iron,which was approximately half the total rainwater iron,was highest between noon and 6 p.m. (EST), probably dueto more intense regional convection including land-seabreezes during that time. The ratio ofFe(II)(aq)/Fe(III)(aq) was also highest in rainreceived between noon and 6 p.m., which most likelyreflects photochemical reduction of Fe(III)(aq)complexes to form Fe(II)(aq). A conceptual modeldepicting the interplay between iron species, lightintensity and organic ligands in rainwater ispresented.  相似文献   

Distance and discourse in the local labour market: the case of Singapore     

Neil M Coe  Philip F Kelly 《Area》2000,32(4):413-422

Summary In this paper we use the example of Singapore to make two theoretical contributions to the geographical literature on local labour markets. Firstly, we suggest that the local labour market should be conceived of as an extended 'network space' that is constituted by extra-local linkages and flows as well as local interactions. The importance of certain kinds of foreign 'workers' and 'talent' in Singapore can be used to illustrate this argument. Secondly, we contend that locally constructed discourses can actively shape labour market dynamics, exemplified here by the rise of 'knowledge-based economy' rhetoric in Singapore.  相似文献   

Reply to Comment: A Last Glacial Maximum pollen record from Bodmin Moor showing a possible cryptic northern refugium in southwest England. (Kelly et al., 2010)     

Ann Kelly  Dan J. Charman  Rewi M. Newnham 《第四纪科学杂志》2010,25(5):828-829

  相似文献   

Late Holocene fluctuations of Quelccaya Ice Cap,Peru, registered by nearby lake sediments          下载免费PDF全文

Justin S. Stroup  Meredith A. Kelly  Thomas V. Lowell  Colby A. Smith  Samuel A. Beal  Joshua D. Landis  Pedro M. Tapia 《第四纪科学杂志》2015,30(8):830-840

  相似文献