ISSN:0278-4491    

DOI:10.1002/ep.670050302

出版商:American Institute of Chemical Engineers    

年代:1986

数据来源: WILEY

ISSN:0278-4491    

DOI:10.1002/ep.670050303

出版商:American Institute of Chemical Engineers    

年代:1986

数据来源: WILEY

ISSN:0278-4491    

DOI:10.1002/ep.670050304

出版商:American Institute of Chemical Engineers    

年代:1986

数据来源: WILEY

ISSN:0278-4491    

DOI:10.1002/ep.670050305

出版商:American Institute of Chemical Engineers    

年代:1986

数据来源: WILEY

ISSN:0278-4491    

DOI:10.1002/ep.670050306

出版商:American Institute of Chemical Engineers    

年代:1986

数据来源: WILEY

摘要:

AbstractParticle size distributions and heavy metal removals are presented for hydroxide precipitations and heavy metal removals are presented for hydroxide precipitation and sulfide precipitation of zinc and cadmium in the presence of several weak complexing agents, namely citrate, tartrate, and ammonia. The pH was held constant at pH 10.0 in these experiments. The presence of these weak complexing agents had little effect on the chemical equilibrium for both the hydroxide and sulfide systems due to their weak complexing ability with metal ions. The presence of the complexing agents does affect the particle size distribution, generally forming smaller particles. Particle size distributions are presented for the Zn(OH)2, ZnS, Cd(OH)2, and CdS systems (at pH 10.0) in the presence of the chelating agents citrate, tartrate, and ammonia. Sulfide precipitation exhibits a better particle size distribution and settling characteristics than the corresponding metal hydroxide precipitation for both zinc and cadmium.

ISSN:0278-4491    

DOI:10.1002/ep.670050307

出版商:American Institute of Chemical Engineers    

年代:1986

数据来源: WILEY

摘要:

AbstractProcess waters collected during a Department of Energy's in situ tar sand extraction experiment near Vernal, Utah were treated by polymer assisted induced air flotation and activated carbon adsorption. The flotation process removed over 99 percent of the organic load as emulsified bitumen but did little to reduce residual toxicity in the effluents. Activated carbon adsorption was needed to remove the toxic materials from the waste stream.GC/MS analysis, using a modification of the EPA Method 625, yielded an estimated 2000 compounds in the untreated process water. Internal and recovery standards present at 10 ppm were totally obscured in the chromatogram. Flotation effluents contained 39 identified organic compounds; none of which was listed on EPA's hazardous chemicals list. Internal and recovery standards were immediately visible in the chromatogram. The GC/MS analysis was unable to determine the chemical basis for the toxic properties present.

ISSN:0278-4491    

DOI:10.1002/ep.670050308

出版商:American Institute of Chemical Engineers    

年代:1986

数据来源: WILEY

摘要:

AbstractRemoval of contaminants from process and waste water by adsorption with transition aluminas is receiving increased attention. As separation requirements become more stringent, the advent of controlled surface chemistry and pore morphology in adsorbent processing has resulted in innovative application of these materials to water treatment. This paper reviews current technology and examines emerging processes utilizing these versatile materials.

ISSN:0278-4491    

DOI:10.1002/ep.670050309

出版商:American Institute of Chemical Engineers    

年代:1986

数据来源: WILEY

摘要:

AbstractThis article describes a work‐in‐progress. The development work described herein has culminated in the construction of a full‐scale treatment system which is currently in operation and is being optimized in both its practical operating as well as its treatment process as

ISSN:0278-4491    

DOI:10.1002/ep.670050310

出版商:American Institute of Chemical Engineers    

年代:1986

数据来源: WILEY

摘要:

AbstractThe United States currently depends on coal for over half of its electric power generation. Current legislative and regulatory initiatives related to acid rain and other environmental concerns have focused on retrofit controls on existing plants and increasingly stringent requirements for new plants. This paper focuses on some of the technological approaches United States utilities are using and could be using in the future to generate electric power cleanly and reliably. Those technologies discussed include precombustion controls (physical coal cleaning and coal switching/blending), combustion controls (low NOxcombustion, furnace sorbent injection, and fluidized bed combustion), and postcombustion controls (flue gas NOxcontrol, wet and dry flue gas desulfurization, and post‐furnace dry sorbent injection) The commercial status, economics, and critical issues for retrofit and new commercial application of these technologies to utility systems are discusse

ISSN:0278-4491    

DOI:10.1002/ep.670050311

出版商:American Institute of Chemical Engineers    

年代:1986

数据来源: WILEY