Investigation of the inhibitory effects of heavy metals on heterotrophic biomass activity and their mitigation through the use of natural minerals

Malamis, S; Katsou, E; Daskalakis, N; Haralambous, KJ

dc.contributor.author	Malamis, S	en
dc.contributor.author	Katsou, E	en
dc.contributor.author	Daskalakis, N	en
dc.contributor.author	Haralambous, KJ	en
dc.date.accessioned	2014-03-01T02:09:24Z
dc.date.available	2014-03-01T02:09:24Z
dc.date.issued	2012	en
dc.identifier.issn	10934529	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/29839
dc.subject	activated sludge	en
dc.subject	biomass inhibition	en
dc.subject	heavy metals	en
dc.subject	minerals	en
dc.subject	Toxicity	en
dc.subject.other	Activated sludge	en
dc.subject.other	Heavy metal concentration	en
dc.subject.other	Heterotrophic biomass	en
dc.subject.other	Inhibitory effect	en
dc.subject.other	Low concentrations	en
dc.subject.other	Mineral addition	en
dc.subject.other	Natural minerals	en
dc.subject.other	Respiratory activity	en
dc.subject.other	Specific oxygen uptake rate	en
dc.subject.other	Toxic effect	en
dc.subject.other	Toxic metals	en
dc.subject.other	Adsorption	en
dc.subject.other	Agglomeration	en
dc.subject.other	Batch reactors	en
dc.subject.other	Biomass	en
dc.subject.other	Heavy metals	en
dc.subject.other	Lead	en
dc.subject.other	Minerals	en
dc.subject.other	Toxicity	en
dc.subject.other	Zinc	en
dc.subject.other	Copper	en
dc.subject.other	bentonite	en
dc.subject.other	copper	en
dc.subject.other	lead	en
dc.subject.other	nickel	en
dc.subject.other	zeolite	en
dc.subject.other	zinc	en
dc.subject.other	activated sludge	en
dc.subject.other	article	en
dc.subject.other	batch reactor	en
dc.subject.other	biomass	en
dc.subject.other	concentration (parameters)	en
dc.subject.other	heterotrophic biomass	en
dc.subject.other	inhibition kinetics	en
dc.subject.other	oxygen uptake rate	en
dc.subject.other	physical parameters	en
dc.title	Investigation of the inhibitory effects of heavy metals on heterotrophic biomass activity and their mitigation through the use of natural minerals	en
heal.type	journalArticle	en
heal.identifier.primary	10.1080/10934529.2012.695266	en
heal.identifier.secondary	http://dx.doi.org/10.1080/10934529.2012.695266	en
heal.publicationDate	2012	en
heal.abstract	This study examined the inhibitory effects of lead, copper, nickel and zinc on heterotrophic biomass and their potential mitigation through the use of low-cost, natural minerals. Activated sludge was placed in batch reactors and specific heavy metal concentrations were added. Subsequently, the biomass specific oxygen uptake rate (sOUR) was determined to assess the level of biomass inhibition. Biomass inhibition by heavy metals followed the order Cu2+>Pb2+>Zn2+>Ni2+, with copper being the most toxic metal, causing high inhibition of heterotrophic biomass even at relatively low concentrations (i.e. 10 mg·L1). Zn had very small toxic effect at 10 mg·L1, while at 40 mg·L1 the level of biomass inhibition reached 80%. Nickel stimulated activated sludge activity at concentrations of the order of 10 mg·L1. The addition of 10 g·L1 bentonite and zeolite in activated sludge resulted in the decrease of the inhibitory effect of heavy metals on biomass respiratory activity. In some cases, mineral addition was very favorable as inhibition was reduced from 69-90% to less than 55% and even up to 12%. The beneficial action of minerals is attributed both to the adsorption of heavy metals on the mineral and on the potential aggregation between mineral and sludge particles. © 2012 Copyright Taylor and Francis Group, LLC.	en
heal.journalName	Journal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering	en
dc.identifier.doi	10.1080/10934529.2012.695266	en
dc.identifier.volume	47	en
dc.identifier.issue	13	en
dc.identifier.spage	1992	en
dc.identifier.epage	1999	en