摘要:

AbstractAddition of powdered activated carbon (PAC) significantly improved treatment of a chemical waste landfill leachate in sequencing batch bioreactors (SBRs). Concentrations for many of the monitored halogenated organic compounds in the effluent were below their respective detection limits. Excellent treatment efficiency was achieved under a variety of operating conditions: wastewater composition, feed rate, hydraulic retention time, organic loading, PAC dosages, biomass and PAC concentrations in the bioreactors. The PAC‐SBR performance was unaffected when wastewater feeding was suspended during weekends and holidays. The PAC‐SBR treatment cost is much lower than either that of the conventional granular activated carbon adsorption technology or the two‐stage process of biodegradation and carbon trea

ISSN:0278-4491    

DOI:10.1002/ep.670060116

出版商:American Institute of Chemical Engineers    

年代:1987

数据来源: WILEY

ISSN:0278-4491    

DOI:10.1002/ep.670060102

出版商:American Institute of Chemical Engineers    

年代:1987

数据来源: WILEY

ISSN:0278-4491    

DOI:10.1002/ep.670060103

出版商:American Institute of Chemical Engineers    

年代:1987

数据来源: WILEY

ISSN:0278-4491    

DOI:10.1002/ep.670060104

出版商:American Institute of Chemical Engineers    

年代:1987

数据来源: WILEY

ISSN:0278-4491    

DOI:10.1002/ep.670060105

出版商:American Institute of Chemical Engineers    

年代:1987

数据来源: WILEY

ISSN:0278-4491    

DOI:10.1002/ep.670060106

出版商:American Institute of Chemical Engineers    

年代:1987

数据来源: WILEY

摘要:

AbstractThis article describes a 2‐stage scrubbing process which utilizes sodium hydroxide or sodium carbonate as the neutralizing chemical for sulfur dioxide and sulfur trioxide emissions to remove contaminants from gas streams preceding CO2absorption processes.Amine absorption processes are adversely affected by sulfur dioxide in the gas stream, and it is desirable to reduce sulfur dioxide concentrations to less than 5 ppm (vol).Conventional flue gas desulfurization processes do not achieve outlet concentrations at this level. With appropriate controls on pH, ionic strength, and liquid recirculation rates, the sodium alkalies can achieve these outlet concentrations. When concentrations of sulfur dioxide absorbed become sufficiently large to make the economics of a simple throw‐away process uneconomical, the waste solutions can be regenerated in the double‐alkali process by reacting them externally from the scrubbing system with calcium compounds. This process is also described. Particular emphasis is placed on process design for reliability. Materials of construction, process controls, and process chemistry are disc

ISSN:0278-4491    

DOI:10.1002/ep.670060117

出版商:American Institute of Chemical Engineers    

年代:1987

数据来源: WILEY

ISSN:0278-4491    

DOI:10.1002/ep.670060115

出版商:American Institute of Chemical Engineers    

年代:1987

数据来源: WILEY

摘要:

AbstractThe new Resource Conservation and Recovery Act (RCRA) hazardous waste incineration regulations have ushered in a new era which will result in a better understanding of the significant combustion design parameters relative to hazardous waste destruction. This paper discusses some of the important issues involved with the RCRA trial burn program, RCRA trial burn database information, and three RCRA research trial burn programs. These programs have made significant contributions to an increased understanding of important incineration destruction and emission mechanisms.

ISSN:0278-4491    

DOI:10.1002/ep.670060118

出版商:American Institute of Chemical Engineers    

年代:1987

数据来源: WILEY

摘要:

AbstractThe impact of background dissolved organic matter (DOM) on the adsorption of a target organic compound, lindane, by GAC was examined. Both capacity and rate of lindane removal decreased in proportion to the DOM concentration. Two modeling approaches employing homogeneous surface diffusion versions of the Michigan Adsorption Design and Applications Model (MADAM‐HSD) adequately simulated and predicted data for fixed‐bed adsorbers. In one approach, adsorption equilibrium and mass transport parameters were evaluated and the data modeled in terms of the target compound only, using a single‐solute modeling scheme.The second methodology treated the background DOM as an independent component and utilized a two‐solute version of MADAM‐HSD to describe and/or predict adsorber breakthrough profiles for both lindane and DOM. The short bed adsorber (SBA) technique was verified as a useful tool for determination of the mass transport parameters associated with the system

ISSN:0278-4491    

DOI:10.1002/ep.670060119

出版商:American Institute of Chemical Engineers    

年代:1987

数据来源: WILEY