摘要:

AbstractChitosan, a polyglucosamine, can be formed by de‐acetylating chitin, a major structural component of crustacean shells. Crab shell particles were treated and deacetylated to elaborate chitosan on their outer peripheries. Experimental data and an approximate preliminary economic analysis are presented to show the potential of using treated crab shell waste for purifying electroplating rinsewater. This approach is compared with currently used precipitation technology for removing metal ion

ISSN:0278-4491    

DOI:10.1002/ep.670090116

出版商:American Institute of Chemical Engineers    

年代:1990

数据来源: WILEY

摘要:

AbstractHumidity effects on carbon adsorption were investigated using five volatile organic compounds (VOCs). Relative humidities ranged from 54% to 92%. Under these high relative humidity conditions, the Dubinin–Polanyi equation was used to analyze the results of activated carbon adsorption capacity. Based on the Dubinin–Polanyi equation and the concept of a mass transfer zone, an adsorption kinetic equation was derived to predict the carbon adsorption (MTZ) velocity and the adsorbate concentration profile in the

ISSN:0278-4491    

DOI:10.1002/ep.670090117

出版商:American Institute of Chemical Engineers    

年代:1990

数据来源: WILEY

摘要:

AbstractA mathematical model has been developed for in situ biodegradation of contaminants in a soil bed. The model equations comprise three convection‐dispersion partial differential equations and one ordinary differential equation. Dimensional analysis of the model equations has been performed, and solution of these equations has been conducted by the newly‐developed three‐point backward finite difference method. The effects of insufficient oxygen supply, growth of biomass and resistance to contaminant migration on the rate of biodegradation have been examined by numerically simulating the dynamic behavior of in situ biodegradation processes. The results of numerical simulation indicate that the rate of biodegradation of contaminants in soil may be constrained not only by insufficient oxygen supply, but also by resistance to contaminant migration within the pore network. The effect of recycling the unreacted contaminants from the bottom of the bed to the top has been examined through simulation, showing that biodegradation takes place mainly in the upper part of th

ISSN:0278-4491    

DOI:10.1002/ep.670090118

出版商:American Institute of Chemical Engineers    

年代:1990

数据来源: WILEY

摘要:

AbstractDisposal of refinery biotreatment sludges through land application is being strictly controlled and, in many cases, eliminated by regulatory constraint. An alternative to land application of sludges is incineration. This paper discusses fluidized‐bed incineration pilot studies conducted on refinery sludges obtained from two different refineries. Destruction of hazardous organic constituents, as well as the fate of inorganic metals, is discussed. Metal emissions are examined and the impact of the new EPA metals emissions limits is investigated. Installation of a waste heat recuperator to preheat combustion air is explored as an alternative to a high‐pressure sludge dewatering proc

ISSN:0278-4491    

DOI:10.1002/ep.670090119

出版商:American Institute of Chemical Engineers    

年代:1990

数据来源: WILEY

摘要:

AbstractPilot tests by Fluidized Bed Combustion (FBC) have successfully destroyed Spent Potliner (SPL), a hazardous waste by‐product from aluminum smelters. Well known technical challenges such as ash agglomeration, ash leachate control, and off‐gas emission control have been studied and overcome by additives and by special combustion chamber design. Economic evaluation of a 20,000 tons per year (9 megawatt) facility indicates that disposal costs are competitive with land‐based disposal. A 0.5 MW Fluidized Bed Combustor of this design is under construction by Turnpoint Engineering Corpor

ISSN:0278-4491    

DOI:10.1002/ep.670090121

出版商:American Institute of Chemical Engineers    

年代:1990

数据来源: WILEY

ISSN:0278-4491    

DOI:10.1002/ep.670090101

出版商:American Institute of Chemical Engineers    

年代:1990

数据来源: WILEY