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Article: Precipitates in anaerobic granules treating sulphate-bearing wastewater

TitlePrecipitates in anaerobic granules treating sulphate-bearing wastewater
Authors
KeywordsAnaerobic
Granule
Inhibition
Precipitate
SEM
Sulphate
Sulphide
TEM
X-ray
Issue Date1998
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/watres
Citation
Water Research, 1998, v. 32 n. 9, p. 2627-2632 How to Cite?
AbstractThree types of biogranules treating wastewater containing various sulphate concentrations were examined using scanning and transmission electron microscopies. The two biogranules treating wastewater containing sulphate up to 2000 mg·l-1 showed high degrees of activities. However, activities of the third biogranules, which contained 102 mg-S·(g-VSS)-1 after treating wastewater containing sulphate up to 7500 mg·l-1 for over 286 days, dropped drastically. Microscopic examinations showed that precipitates accumulated in the biogranules treating sulphate-bearing wastewater; the degrees of precipitation increased with sulphate concentration in wastewater and the duration of treatment. Excessive precipitation was found throughout the entire biogranule cross-section of the third biogranules. Analyses by X-ray spectrometry further showed that the precipitates were mainly composed of sulphur, plus copper, iron and nickel presumably in the form of metal sulphides. These observations suggest that the inhibition of bioactivities of anaerobic granules was likely resulted from the accumulated sulphureous precipitates on the bacterial surface. This point was overlooked by previous investigators who tended to attribute the inhibition to the toxic effects of either sulphate, sulphide or un-dissociated H2S. | Anaerobic technology has been applied to the full-scale treatment of high-strength industrial wastewater in the recent decade. However, many wastewaters, such as those from pharmaceutical, pulp/paper, fermentation, petrochemical and mining industries, also contain high concentration of sulphate. Three types of biogranules treating wastewater containing various sulphate concentrations were examined using scanning and transmission electron microscopies. The two biogranules treating wastewater containing sulphate up to 2000 mg·l-1 showed high degrees of activities. However, activities of the third biogranules, which contained 102 mg-S·(g-VSS)-1 after treating wastewater containing sulphate up to 7500 mg·l-1 for over 286 days, dropped drastically. Microscopic examinations showed that precipitates accumulated in the biogranules treating sulphate-bearing wastewater; the degrees of precipitation increased with sulphate concentration in wastewater and the duration of treatment. Excessive precipitation was found throughout the entire biogranule cross-section of the third biogranules. Analyses by X-ray spectrometry further showed that the precipitates were mainly composed of sulphur, plus copper, iron and nickel presumably in the form of metal sulphides. These observations suggest that the inhibition of bioactivities of anaerobic granules was likely resulted from the accumulated sulphureous precipitates on the bacterial surface. This point was overlooked by previous investigators who tended to attribute the inhibition to the toxic effects of either sulphate, sulphide or un-dissociated H2S.
Persistent Identifierhttp://hdl.handle.net/10722/70715
ISSN
2015 Impact Factor: 5.991
2015 SCImago Journal Rankings: 2.772
References

 

DC FieldValueLanguage
dc.contributor.authorLiu, Yen_HK
dc.contributor.authorFang, HHPen_HK
dc.date.accessioned2010-09-06T06:25:27Z-
dc.date.available2010-09-06T06:25:27Z-
dc.date.issued1998en_HK
dc.identifier.citationWater Research, 1998, v. 32 n. 9, p. 2627-2632en_HK
dc.identifier.issn0043-1354en_HK
dc.identifier.urihttp://hdl.handle.net/10722/70715-
dc.description.abstractThree types of biogranules treating wastewater containing various sulphate concentrations were examined using scanning and transmission electron microscopies. The two biogranules treating wastewater containing sulphate up to 2000 mg·l-1 showed high degrees of activities. However, activities of the third biogranules, which contained 102 mg-S·(g-VSS)-1 after treating wastewater containing sulphate up to 7500 mg·l-1 for over 286 days, dropped drastically. Microscopic examinations showed that precipitates accumulated in the biogranules treating sulphate-bearing wastewater; the degrees of precipitation increased with sulphate concentration in wastewater and the duration of treatment. Excessive precipitation was found throughout the entire biogranule cross-section of the third biogranules. Analyses by X-ray spectrometry further showed that the precipitates were mainly composed of sulphur, plus copper, iron and nickel presumably in the form of metal sulphides. These observations suggest that the inhibition of bioactivities of anaerobic granules was likely resulted from the accumulated sulphureous precipitates on the bacterial surface. This point was overlooked by previous investigators who tended to attribute the inhibition to the toxic effects of either sulphate, sulphide or un-dissociated H2S. | Anaerobic technology has been applied to the full-scale treatment of high-strength industrial wastewater in the recent decade. However, many wastewaters, such as those from pharmaceutical, pulp/paper, fermentation, petrochemical and mining industries, also contain high concentration of sulphate. Three types of biogranules treating wastewater containing various sulphate concentrations were examined using scanning and transmission electron microscopies. The two biogranules treating wastewater containing sulphate up to 2000 mg·l-1 showed high degrees of activities. However, activities of the third biogranules, which contained 102 mg-S·(g-VSS)-1 after treating wastewater containing sulphate up to 7500 mg·l-1 for over 286 days, dropped drastically. Microscopic examinations showed that precipitates accumulated in the biogranules treating sulphate-bearing wastewater; the degrees of precipitation increased with sulphate concentration in wastewater and the duration of treatment. Excessive precipitation was found throughout the entire biogranule cross-section of the third biogranules. Analyses by X-ray spectrometry further showed that the precipitates were mainly composed of sulphur, plus copper, iron and nickel presumably in the form of metal sulphides. These observations suggest that the inhibition of bioactivities of anaerobic granules was likely resulted from the accumulated sulphureous precipitates on the bacterial surface. This point was overlooked by previous investigators who tended to attribute the inhibition to the toxic effects of either sulphate, sulphide or un-dissociated H2S.en_HK
dc.languageengen_HK
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/watresen_HK
dc.relation.ispartofWater Researchen_HK
dc.subjectAnaerobicen_HK
dc.subjectGranuleen_HK
dc.subjectInhibitionen_HK
dc.subjectPrecipitateen_HK
dc.subjectSEMen_HK
dc.subjectSulphateen_HK
dc.subjectSulphideen_HK
dc.subjectTEMen_HK
dc.subjectX-rayen_HK
dc.titlePrecipitates in anaerobic granules treating sulphate-bearing wastewateren_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0043-1354&volume=32 &issue=9&spage=2627 &epage= 2632&date=1998&atitle=Precipitates+in+anaerobic+granules+treating+sulphate-bearing+wastewateren_HK
dc.identifier.emailFang, HHP:hrechef@hkucc.hku.hken_HK
dc.identifier.authorityFang, HHP=rp00115en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/S0043-1354(98)00010-4en_HK
dc.identifier.scopuseid_2-s2.0-0032171592en_HK
dc.identifier.hkuros41846en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0032171592&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume32en_HK
dc.identifier.issue9en_HK
dc.identifier.spage2627en_HK
dc.identifier.epage2632en_HK
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridLiu, Y=36013132500en_HK
dc.identifier.scopusauthoridFang, HHP=7402542625en_HK

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