Detoxification of tannery waste liquors with an electrolysis system

Vlyssides, AG; Israilides, CJ

dc.contributor.author	Vlyssides, AG	en
dc.contributor.author	Israilides, CJ	en
dc.date.accessioned	2014-03-01T01:12:45Z
dc.date.available	2014-03-01T01:12:45Z
dc.date.issued	1997	en
dc.identifier.issn	0269-7491	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/12229
dc.subject	Chromium(III) removal	en
dc.subject	Electrochemical treatment	en
dc.subject	Oxidation of phenols	en
dc.subject	Tannery waste liquors	en
dc.subject.classification	Environmental Sciences	en
dc.subject.other	ammonia	en
dc.subject.other	carbon dioxide	en
dc.subject.other	chlorine	en
dc.subject.other	chromium	en
dc.subject.other	hydroxyl radical	en
dc.subject.other	nitrogen oxide	en
dc.subject.other	oxygen	en
dc.subject.other	phenol derivative	en
dc.subject.other	stainless steel	en
dc.subject.other	sulfide	en
dc.subject.other	sulfur dioxide	en
dc.subject.other	article	en
dc.subject.other	biochemical oxygen demand	en
dc.subject.other	chemical oxygen demand	en
dc.subject.other	electrolysis	en
dc.subject.other	leather industry	en
dc.subject.other	oxidation	en
dc.subject.other	suspended particulate matter	en
dc.subject.other	time	en
dc.subject.other	waste water management	en
dc.subject.other	Gadus morhua	en
dc.subject.other	Pseudomonas phage gh-1	en
dc.title	Detoxification of tannery waste liquors with an electrolysis system	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0269-7491(97)00062-6	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0269-7491(97)00062-6	en
heal.language	English	en
heal.publicationDate	1997	en
heal.abstract	This paper describes an electrochemical treatment and detoxification of tannery waste liquors (TWL). In this technique, TWL was passed through an electrolytic cell using a Ti/Pt anode and a stainless steel 304 cathode. Owing to the strong oxidizing potential of the chemicals produced (chlorine, oxygen, hydroxyl radicals and other oxidants) the organic and inorganic pollutants (ammonia, sulfides and chromium) were wet oxidized to carbon dioxide, nitrogen oxides and sulfur dioxide. In addition, chromium was precipitated as Cr-2(SO4)(3). Experiments were run in a batch, laboratory-scale, pilot-plant, and the results are reported herein. After 30 min and 3 h of electrolysis at 0.26 A cm(-2), 45 degrees C and pH 9, total chemical oxygen demand (GOD) was reduced by 52 and 83% and biochemical oxygen demand (BOD5) was reduced by 35 and 66%, respectively. Additionally, total suspended solids (TSS) were reduced by 8.6 and 26%, total phenolic compounds were reduced by 95.6 and 99.4%. Ammonia, sulfides and soluble chromium were reduced by 100% in both cases, while the mean anode efficiency was 81 g h(-1) A(-1) m(-2) and 1.9 g h(-1) A(-1) m(-2). Also, the mean energy consumption was 4.8 kwh kg(-1) of COD reduced and 200 kwh kg(-1) of COD reduced for 0.5 and 3 h, respectively. These results strongly indicate that this electrolytic method of total oxidation of TWL cannot be cost effective for wide use. However, it can be used as an effective pretreatment stage for detoxification of the wastewater, owing to great efficiency especially with respect to COD and toxicity (phenolics) reduction. (C) 1997 Elsevier Science Ltd.	en
heal.publisher	ELSEVIER SCI LTD	en
heal.journalName	Environmental Pollution	en
dc.identifier.doi	10.1016/S0269-7491(97)00062-6	en
dc.identifier.isi	ISI:A1997YD75800017	en
dc.identifier.volume	97	en
dc.identifier.issue	1-2	en
dc.identifier.spage	147	en
dc.identifier.epage	152	en