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1. |
The Dow Stretford chemical recovery process |
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Environmental Progress,
Volume 5,
Issue 1,
1986,
Page 1-4
C. Alan Hammond,
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摘要:
AbstractThe Dow patented Stretford Chemical Recovery Process reclaims the two key chemicals while purging undesirable by‐products from Stretford gas sweetening plants. Recovery of these chemicals can reduce costs in terms of chemical loss and solution disposal. The process involves filtration, charcoal adsorption and ion exchang
ISSN:0278-4491
DOI:10.1002/ep.670050106
出版商:American Institute of Chemical Engineers
年代:1986
数据来源: WILEY
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2. |
Bhopal plus one: A chemical engineer's watershed |
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Environmental Progress,
Volume 5,
Issue 1,
1986,
Page 2-3
Peter B. Lederman,
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ISSN:0278-4491
DOI:10.1002/ep.670050102
出版商:American Institute of Chemical Engineers
年代:1986
数据来源: WILEY
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3. |
Calcium sulfite hemihydrate: Crystal growth rate and crystal habit |
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Environmental Progress,
Volume 5,
Issue 1,
1986,
Page 5-11
Philip C. Tseng,
Gary T. Rochelle,
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PDF (848KB)
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摘要:
AbstractThe crystal growth rate of CaSO3· 1/2H2O was measured by a pH‐stat method in aqueous solution with pH 3.5 to 6.5, 1 to 25 mM dissolved sulfite, 0.01 to 0.3 M Ca++, and 0 to 25 mM sulfate. The growth rate was a strong function of relative supersaturation and was strongly inhibited by dissolved sulfate. The growth rate per unit BET surface area, R' (mole/cm2‐min), is given by: 9.7 × 10−4exp (−10250/RT) × (RSCaSO3−1)2× RSCaSO4−1, where RSCaSO3and RSCaSO4are the relative saturations with respect to calcium sulfite and gypsum, respectively. Scanning electron microscopy and IR spectroscopy demonstrated that solids generated in the presence of dissolved sulfate contained solid solution sulfate and crystallized as agglomerates of very thin platelets. In the absence of solid or dissolved sulfate the solids were agglomerates of well‐informed columnar, h
ISSN:0278-4491
DOI:10.1002/ep.670050107
出版商:American Institute of Chemical Engineers
年代:1986
数据来源: WILEY
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4. |
Environmental shorts |
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Environmental Progress,
Volume 5,
Issue 1,
1986,
Page 7-8
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ISSN:0278-4491
DOI:10.1002/ep.670050104
出版商:American Institute of Chemical Engineers
年代:1986
数据来源: WILEY
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5. |
Books |
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Environmental Progress,
Volume 5,
Issue 1,
1986,
Page 8-8
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PDF (108KB)
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ISSN:0278-4491
DOI:10.1002/ep.670050105
出版商:American Institute of Chemical Engineers
年代:1986
数据来源: WILEY
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6. |
Hazardous waste characterization extraction procedures for the analysis of blast‐furnace slag from secondary lead smelters |
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Environmental Progress,
Volume 5,
Issue 1,
1986,
Page 12-17
Nancy Karen Fish Woodley,
James V. Walters,
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摘要:
AbstractQuantitative data from actual field tests show that the carbonic‐acid content of the landfill area is critica
ISSN:0278-4491
DOI:10.1002/ep.670050108
出版商:American Institute of Chemical Engineers
年代:1986
数据来源: WILEY
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7. |
Volatile organic compounds at hazardous waste sites and a sanitary landfill in New Jersey |
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Environmental Progress,
Volume 5,
Issue 1,
1986,
Page 18-27
John LaRegina,
Joseph W. Bozzelli,
Ron Harkov,
Sam Gianti,
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摘要:
AbstractAn up‐to‐date review of the present situat
ISSN:0278-4491
DOI:10.1002/ep.670050109
出版商:American Institute of Chemical Engineers
年代:1986
数据来源: WILEY
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8. |
Modeling the transport of 2,3,7,8‐TCDD and other low volatility chemicals in soils |
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Environmental Progress,
Volume 5,
Issue 1,
1986,
Page 28-33
Raymond A. Freeman,
Jerry M. Schroy,
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摘要:
AbstractA model has been developed to describe the transport of low volatility organic chemicals in a column of soil. The mathematical model calculates the rate of movement through the soil by solving the dynamic material and energy balances around the soil column. The model is used to make predictions on the transport of 2,3,7,8‐tetrachlorodibenzop‐dioxin (TCDD) at the Eglin Air Force Base Agent Orange biodegradation test plots. The model predicts a vertical movement of TCDD, buried in 1972, through the soil column. Soil column profile data confirm the vertical movement of T
ISSN:0278-4491
DOI:10.1002/ep.670050110
出版商:American Institute of Chemical Engineers
年代:1986
数据来源: WILEY
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9. |
Dissolution rate of calcium sulfite hemihydrate in flue gas desulfurization processes |
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Environmental Progress,
Volume 5,
Issue 1,
1986,
Page 34-40
Philip C. Teseng,
Gary T. Rochelle,
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PDF (705KB)
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摘要:
AbstractThe rate of calcium sulfite dissolution in slurry scrubbers and hold tanks for flue gas desulfurization affects SO2absorption, limestone utilization and sulfite oxidation. The dissolution rates of calcium sulfite were measured by the pH‐state method. A mass transfer model was developed assuming that calcium sulfite particles behave as spheres in an infinite stagnant solution. The model combined with the Bechtel‐modified Radian solution equilibrium program successfully predicts calcium sulfite dissolution rates at pH 3.5 – 5.5, 23 and 55°C, 0.001 – 0.3 M Ca++and 2 – 25 mM dissolved sulfite. The effects of sulfate content in solids and liquids and particle size/shape were also studied.At conditions typical of flue gas desulfurization processes calcium sulfite dissolution was controlled by mass transfer, not surface reaction kinetics. Dissolution was fast at low pH and slowed near the equilibrium pH determined by dissolved Ca++and SO3=concentrations in the aqueous solutions, Kspof the CaSO3· 1/2H2O solids, and temperature. The presence of dissolved Mg++increased the equilibrium pH and enhanced the disolution rate. The presence of dissolved sulfate reduced the dissolution rate and the equilibrium pH. The effect of sulfate was not adequately described by the mass tra
ISSN:0278-4491
DOI:10.1002/ep.670050111
出版商:American Institute of Chemical Engineers
年代:1986
数据来源: WILEY
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10. |
Biological treatment of a landfill leachate in sequencing batch reactors |
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Environmental Progress,
Volume 5,
Issue 1,
1986,
Page 41-50
Wei‐Chi Ying,
Robert R. Bonk,
Vernon J. Lloyd,
Stanley A. Sojka,
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摘要:
AbstractA landfill leachate is treated, after mixing with chemical manufacturing wastewaters, by activated carbon adsorption. Biotreatment of the combined wastewater in sequencing batch reactors (SBRs) reduced the carbon requirement by 90%. Excellent treatment efficiency was consistently achieved under a variety of operating conditions: wastewater TOC, feed rate, hydraulic retention time, MLSS, organic loading, temperature, and cycle time. The SBR performance was unaffected when wastewater feeding was suspended during weekends and holidays. Results obtained in 1‐L SBRs were reproduced in 12‐L and 500‐L units. The experimental data served as the basis for design of a full‐scale SBR‐adsorption system. The integrated wastewater treatment system would produce a better quality effluent at a lower overall cost. Biodegradation rates for some of the more persistent wastewater constituents were enhanced in batch bioreactors which were supplemented with strains of bacteria isolated from the land
ISSN:0278-4491
DOI:10.1002/ep.670050112
出版商:American Institute of Chemical Engineers
年代:1986
数据来源: WILEY
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