Integrated membrane process for the treatment of desulfurization wastewate / Na Yin in Industrial & engineering chemistry research, Vol. 49 N° 7 (Avril 2010)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 49 N° 7 (Avril 2010) . - pp. 3337–3341 Titre : Integrated membrane process for the treatment of desulfurization wastewate Type de document : texte imprimé Auteurs : Na Yin, Auteur ; Fei Liu, Auteur ; Zhaoxiang Zhong, Auteur Année de publication : 2010 Article en page(s) : pp. 3337–3341 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Integrated Membrane Desulfurization Wastewate Résumé : In the desulfurization process for purification of coking gas, a huge amount of wastewater is generated. In order to recover the usable substances such as suspended sulfur (SS) and ammonium salts, e.g., (NH4)2S2O3 and NH4SCN, in the wastewater and also to avoid severe environmental problems in the case of improper disposal, an integrated membrane process mainly consisting of ultrafiltration (UF), nanofiltration (NF), and reverse osmosis (RO) was proposed to treat the wastewater. In the UF process, a ceramic membrane was employed to remove SS and an efficiency of 99.9% and a steady flux of about 500 L·m−2·h−1 were achieved. In the NF step, (NH4)2S2O3 was separated from NH4SCN with a retention ratio of 95.0%, and finally 83.0% of (NH4)2S2O3 was recovered in the retentate, whereas 99.2% of NH4SCN was recovered in the permeate via dialysis with deionized water. In the RO process, NH4SCN can be recovered with an efficiency of 99.0% through a four-pass filtration process. Meanwhile, the RO permeate can be reused in the salt diafiltration process. The results show that the proposed integrated membrane process is technically feasible and economically efficient for the treatment of desulfurization wastewater generated in the coking industry. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901267q [article] Integrated membrane process for the treatment of desulfurization wastewate [texte imprimé] / Na Yin, Auteur ; Fei Liu, Auteur ; Zhaoxiang Zhong, Auteur . - 2010 . - pp. 3337–3341. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 7 (Avril 2010) . - pp. 3337–3341 Mots-clés : Integrated Membrane Desulfurization Wastewate Résumé : In the desulfurization process for purification of coking gas, a huge amount of wastewater is generated. In order to recover the usable substances such as suspended sulfur (SS) and ammonium salts, e.g., (NH4)2S2O3 and NH4SCN, in the wastewater and also to avoid severe environmental problems in the case of improper disposal, an integrated membrane process mainly consisting of ultrafiltration (UF), nanofiltration (NF), and reverse osmosis (RO) was proposed to treat the wastewater. In the UF process, a ceramic membrane was employed to remove SS and an efficiency of 99.9% and a steady flux of about 500 L·m−2·h−1 were achieved. In the NF step, (NH4)2S2O3 was separated from NH4SCN with a retention ratio of 95.0%, and finally 83.0% of (NH4)2S2O3 was recovered in the retentate, whereas 99.2% of NH4SCN was recovered in the permeate via dialysis with deionized water. In the RO process, NH4SCN can be recovered with an efficiency of 99.0% through a four-pass filtration process. Meanwhile, the RO permeate can be reused in the salt diafiltration process. The results show that the proposed integrated membrane process is technically feasible and economically efficient for the treatment of desulfurization wastewater generated in the coking industry. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901267q

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