351 |
Integrated design of chemical waste water treatment systemsWalsh, Stephen January 1993 (has links)
No description available.
|
352 |
Measurement uncertainty in contaminated land investigations related to analyte concentration and costLee, Jongchun January 2002 (has links)
No description available.
|
353 |
The comparative metabolism and toxicity of the pyrethroid insecticide cypermethrin in vertebratesEdwards, Robert January 1985 (has links)
No description available.
|
354 |
Development and performance of polyferric sulphate as a coagulant in water treatmentJiaqian, Jiang January 1995 (has links)
No description available.
|
355 |
The environmental implications of the heat treatment of sewage sludgeNicholls, T. P. January 1980 (has links)
No description available.
|
356 |
Effects of oil pollution on the saltmarch grass Puccinellia maritima (Huds.) ParlAmakiri, Jonathan Ombo January 1985 (has links)
No description available.
|
357 |
Mechanisms of penetration in cartridge filtration of de-ionised waterBentley, James Michael January 1991 (has links)
A programme of research has been carried out into the performance of cartridge filters rated from 0.1 to 0.45 micron in response to steady and varying particle concentrations and water flows. It was discovered that pulsing the water flow to these filters often resulted in release of particles which had been previously captured by the filter. For membrane filters the release of particles was instantaneous. However, for one filter with more depth, a considerable time was required for most of the particles released to be detected. This filter was described as a pre-filter rather than a membrane filter.
|
358 |
Composition, time, and size distributions of airborne particulate material in Utah ValleyLawson, Douglas R. 01 April 1975 (has links)
The Lundgren impactor is used to determine the variations in time and size distributions of particulate matter in Utah Valley. Charged particle X-ray fluorescence is employed in this study to determine elemental concentrations. Air samples are taken during two 24-hour periods in downtown Provo, 24 hours near U.S. Steel Corporation, Geneva Works, and 12 hours at Lindon Elementary School, and diurnal particulate variations are compared. The amounts of lead and bromine are four times greater on a weekday than on a Sunday in downtown Provo, suggesting the effect of the automobile on atmospheric particulate concentrations. Paraffin coated impaction surfaces are compared with uncoated surfaces, and it is shown that collection efficiency is at least 1.5 times greater when a coated impaction surface is used. The effect of rainfall on particulate levels is studied. Experimental results show that potassium, calcium, iron, and titanium are concentrated in larger airborne particulates, while lead, bromine, zinc, and manganese are concentrated in the smaller particles.
|
359 |
Application of fate and transport models to evaluate the efficiency of a Cr(VI) remediation pump and treat systemNkosi, Sifiso Collen January 2016 (has links)
A dissertation submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg, in fulfilment of requirements for the degree of Master of Science in hydrogeology, School of Geosciences. Johannesburg, 23 May 2016. / Groundwater treatment by chemical precipitation is a popular form of remediation at mines
that are in operation. The water quality status at the implementation of the PAT in this study was
compared to the water quality status after a six-month period of active remediation. Chromium is very
important as an industrial metal owing to its numerous uses in a variety of industries. The objective of
the remedial action is to intercept the Cr(VI) plume, abstract contaminated groundwater and
chemically treat it on the surface. The long-term (15-year) objective is to eventually reduce Cr(VI)
concentrations in the aquifer(s) to below 0.05 mg/ℓ. The PAT system was implemented as a mediumterm
(5-year) strategy to intercept the Cr(VI) contamination plume during migration to prevent it from
negatively impacting on groundwater users downstream of the mine.
In the vicinity of the three PAT systems’ abstracting wells, water levels declined by an
average of 2 m compared to the same period in 2014. Periodical fluctuations in the fractured aquifer
are reflective of the influence of fractures on groundwater flow. In the aquifer, hydrochemical
signatures show evidence of mixing between the primary and secondary aquifers. The treatment
system has been successful in reducing Cr(VI) to Cr(III) and precipitating Cr(OH)3. The treatment
system was designed to treat Cr(VI), other elevated constituents and generally high dissolved ions are
not treated in this remedial process. Sulphate concentrations increase after treatment as a result of the
addition of Fe(II)SO4 for chromate contamination treatment purposes.
The simulated reaction path shows that the transformation of CrO4
2- to Cr2O3 in the treatment
system is not immediate. The Cr(VI) to Cr(III) transformation is irreversible, this is beneficial as the
water is abstracted from more reducing conditions, and the treatment ponds are open to the atmosphere
thus the conditions following dosing with Fe(II)SO4 are oxic and chromate complexes are stable over a
wider range of Eh-pH conditions than Cr(III) compounds. This ensures that the efficiency of the
dosing system is not reversed in Settling Pond B. The modelled flow paths are similar to the inferred
flow vectors in the plume capture zone. Fracture flow is the dominant type of flow, the fault zones and
dykes create high permeability conduits to flow. Flow paths are parallel to fault lines or the lateral
dimension of dykes; flow occurs along fractures and deformation zones.
The reduction of Cr(VI) concentrations in some of the peripheral sampling points indicates
that the PAT system has been successful in capturing the chromate contaminated water through
pumping.
Keywords: Hexavalent chromium, groundwater pollution, remediation, pump-and-treat,
fractured aquifers / GR2016
|
360 |
The sea shore contamination of the Lebanese coast /Kortbaoui, Ziad S. January 1997 (has links)
No description available.
|
Page generated in 0.0197 seconds