ISSN:0278-4491    

DOI:10.1002/ep.670060302

出版商:American Institute of Chemical Engineers    

年代:1987

数据来源: WILEY

ISSN:0278-4491    

DOI:10.1002/ep.670060303

出版商:American Institute of Chemical Engineers    

年代:1987

数据来源: WILEY

ISSN:0278-4491    

DOI:10.1002/ep.670060304

出版商:American Institute of Chemical Engineers    

年代:1987

数据来源: WILEY

ISSN:0278-4491    

DOI:10.1002/ep.670060317

出版商:American Institute of Chemical Engineers    

年代:1987

数据来源: WILEY

ISSN:0278-4491    

DOI:10.1002/ep.670060320

出版商:American Institute of Chemical Engineers    

年代:1987

数据来源: WILEY

ISSN:0278-4491    

DOI:10.1002/ep.670060321

出版商:American Institute of Chemical Engineers    

年代:1987

数据来源: WILEY

ISSN:0278-4491    

DOI:10.1002/ep.670060322

出版商:American Institute of Chemical Engineers    

年代:1987

数据来源: WILEY

摘要:

AbstractMembrane treatment of industrial wastewaters is limited to a few applications where the membrane properties and environmental resistance match the particular application. In most cases, however, the membrane in and by itself does not possess all the requirements for the application, such as chemical physical resistance and inherent capability to remove all the waste components. The process described here overcomes these limitations by creating an inert membrane whose task is dewatering only, and relying on chemical and physical pretreatment to render the soluble waste constituents insoluble particles which are then removed by the membrane.

ISSN:0278-4491    

DOI:10.1002/ep.670060323

出版商:American Institute of Chemical Engineers    

年代:1987

数据来源: WILEY

摘要:

AbstractThe feasibility of using electro‐osmosis for removal of heavy metals (Cd, Cu, and Pb) contained in aqueous solutions was examined using soil cores formed from Randall clay — a clay found in Playa lake basins in the High Plains of West Texas. Initially, sorption tests were conducted with the clay dispersed in the metal solutions of interest to determine if adequate sorption would take place. The retention capacity of the clay for Cd was found to be 0.0083 mg/mg of soil. (105kilograms of Cd could be removed in top one‐meter depth of a hectare of Randall clay with a bulk density of 1.4 g/cm3).Electro‐osmosis was found to increase the permeability of the clay but was found to be both a slow rate system (up to 225 days to remove one pore volume of water through a m3of soil) and energy intensive (1.44 × 105kJ to 8.1 × 105kJ per m3of drained water). Problems noted during the test that need solution before further experimentation with this procedure include selection of less corrodible materials for electrodes, prevention of electrolysis of water at potential gradients needed to move the waters being treated through the soil matrix, and control of ion gradients from the anode to the cathode reservoir to prevent backflow episodes from reversing flow from the cathode to the ano

ISSN:0278-4491    

DOI:10.1002/ep.670060324

出版商:American Institute of Chemical Engineers    

年代:1987

数据来源: WILEY

摘要:

AbstractAdsorption of aqueous arsenic on activated alumina was investigated. pH greatly affects the surface chemical interactions of all species of arsenic, inorganic or organic, with hydrous alumina. Arsenate adsorbs well at pHs less than the pHzpcof alumina, with maximum adsorption occurring at pH 5. Maximum adsorption of arsenite occurs at pH 8. The adsorption behavior of monomethyl arsonate (MMA) is similar to that of arsenate. Adsorption of arsenic is enhanced by the presence of cations. Experiments with fixed alumina beds with an empty bed contact time (EBCT) of only five minutes or less indicate that arsenic concentrations typical of North American waters can be removed effectively for long periods of time without regeneration. Spent alumina beds can be successfully regenerated using 0.5% NaOH followed by dilute acid rinse.

ISSN:0278-4491    

DOI:10.1002/ep.670060325

出版商:American Institute of Chemical Engineers    

年代:1987

数据来源: WILEY