ISSN:0278-4491    

DOI:10.1002/ep.670120402

出版商:American Institute of Chemical Engineers    

年代:1993

数据来源: WILEY

ISSN:0278-4491    

DOI:10.1002/ep.670120413

出版商:American Institute of Chemical Engineers    

年代:1993

数据来源: WILEY

ISSN:0278-4491    

DOI:10.1002/ep.670120414

出版商:American Institute of Chemical Engineers    

年代:1993

数据来源: WILEY

ISSN:0278-4491    

DOI:10.1002/ep.670120415

出版商:American Institute of Chemical Engineers    

年代:1993

数据来源: WILEY

ISSN:0278-4491    

DOI:10.1002/ep.670120416

出版商:American Institute of Chemical Engineers    

年代:1993

数据来源: WILEY

ISSN:0278-4491    

DOI:10.1002/ep.670120418

出版商:American Institute of Chemical Engineers    

年代:1993

数据来源: WILEY

ISSN:0278-4491    

DOI:10.1002/ep.670120419

出版商:American Institute of Chemical Engineers    

年代:1993

数据来源: WILEY

摘要:

AbstractMany incinerators in Texas and the USA are required to achieve 95–99% destruction efficiency. Over time incinerator efficiency may drop due to leaks developing in older equipment, resulting in bypass of catalyst beds or heat exchangers. The use of an additional catalyst bed on the incinerator exhaust stack is an economical way to boost the efficiency back to acceptable levels. The secondary catalyst bed is also efficient in converting CO to CO2 and oxidizing other products of incomplete combustion (PICs).Following is a case history of a 12 year old incinerator at IBM‐Austin which was retrofitted with a secondary catalyst bed and successfully achieved 99% destruction in VOCs and reduction in PICs by an order of magnit

ISSN:0278-4491    

DOI:10.1002/ep.670120403

出版商:American Institute of Chemical Engineers    

年代:1993

数据来源: WILEY

摘要:

AbstractThis study investigated the feasibility of using existing ash sedimentation ponds at coal‐fired power plants as treatment reactors to reduce concentrations of metals in bottom ash and fly ash transport waters by precipitation and/or adsorption onto iron oxyhydroxide. Intrapond treatment offers economic advantages over construction of a plant for treatment of ash pond effluent. Bench‐scale experiments were conducted with bottom ash and fly ash suspensions to investigate pH control and removals of aluminum, manganese, and arsenic under different chemical conditions, including addition of ferric chloride to promote adsoption on iron oxyhydroxide. The effects of pH and iron addition on ash‐water partitioning of the metals of interest were studied via batch experiments. In addition, the ability to control pH and promote removal of manganese in an intrapond treatment process was investigated using semi‐continuous, bench‐scale, pond‐simulation reactors. Results of the reactor experiments indicated that the pH could be maintained in range of 8 to 8.5 by dosing the influent with the proper amount of base as determined by batch titration, and that by doing so the influent manganese concentration of 2ppm could be consistently lowered to less than 0.2 ppm. The effects of accumulation of settled ash were examined in the reactor studies and with the use of a coupled hydraulic/sedimentation model for ash ponds. Overall, results of this study suggest that concentrations of most metals of interest in ash pond water can be kept low with control of pH, in situ precipitation of iron oxyhydroxide, and effective sedimentation of particles. Further examination of the intrapond treatment approach i

ISSN:0278-4491    

DOI:10.1002/ep.670120404

出版商:American Institute of Chemical Engineers    

年代:1993

数据来源: WILEY

摘要:

AbstractA mathematical model of bio‐remediation of hydrocarbons in a soil matrix has been developed to predict the rate controlling step and the remediation rate during the bioremediation of a contaminated soil. The model is based on mass transfer of oxygen and oil into the aqueous solution in the soil matrix and the biodegradation of the hydrocarbons in the aqueous solution. Monod's equation was used to describe the biodegradation rate in aqueous solution while the mass transfer equations were used to describe the mass transfer rates of oxygen and oil in the soil matrix. Results from model calculations indicate that the bio‐remediation rate increases and approaches a limiting value when one of the rates becomes controlling. When the parameters of the site soil samples are measured and the solubilities of oxygen and oil in aqueous solution are obtained, the bioremediation rate can be predicted by this model. The rate controlling step of the bioremediation site may be identified quickly and steps to improve the bioremediation rate can be recommen

ISSN:0278-4491    

DOI:10.1002/ep.670120405

出版商:American Institute of Chemical Engineers    

年代:1993

数据来源: WILEY