Heavy metals removal by sand filters inoculated with metal sorbing and precipitating bacteria

Diels, L; Spaans, PH; Van Roy, S; Hooyberghs, L; Ryngaert, A; Wouters, H; Walter, E; Winters, J; Macaskie, L; Finlay, J; Pernfuss, B; Woebking, H; Pumpel, T; Tsezos, M

dc.contributor.author	Diels, L	en
dc.contributor.author	Spaans, PH	en
dc.contributor.author	Van Roy, S	en
dc.contributor.author	Hooyberghs, L	en
dc.contributor.author	Ryngaert, A	en
dc.contributor.author	Wouters, H	en
dc.contributor.author	Walter, E	en
dc.contributor.author	Winters, J	en
dc.contributor.author	Macaskie, L	en
dc.contributor.author	Finlay, J	en
dc.contributor.author	Pernfuss, B	en
dc.contributor.author	Woebking, H	en
dc.contributor.author	Pumpel, T	en
dc.contributor.author	Tsezos, M	en
dc.date.accessioned	2014-03-01T02:42:16Z
dc.date.available	2014-03-01T02:42:16Z
dc.date.issued	2003	en
dc.identifier.issn	0304-386X	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/30895
dc.subject	Bacteria	en
dc.subject	Heavy metals	en
dc.subject	Wastewater	en
dc.subject.classification	Metallurgy & Metallurgical Engineering	en
dc.subject.other	Bacteria	en
dc.subject.other	Polishing	en
dc.subject.other	Precipitation (chemical)	en
dc.subject.other	Sand	en
dc.subject.other	Wastewater treatment	en
dc.subject.other	Sand filters	en
dc.subject.other	Heavy metals	en
dc.title	Heavy metals removal by sand filters inoculated with metal sorbing and precipitating bacteria	en
heal.type	conferenceItem	en
heal.identifier.primary	10.1016/S0304-386X(03)00161-0	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0304-386X(03)00161-0	en
heal.language	English	en
heal.publicationDate	2003	en
heal.abstract	Lame volumes of wastewater containing metals such as Cd, Zn, Cu, Ph, Hg, Ni or Co are mainly treated by precipitation processes. However, waters treated in such ways do not always meet regulatory standards. And in many cases, ecotaxes must be paid on the heavy metals load in the discharged water. Therefore, a second polishing treatment is often necessary. In order to be economically acceptable, the technology must be cheap and adapted to the treatment of large volumes. The use of sand filters inoculated with heavy metal biosorbing and bioprecipitating bacteria fulfils these objectives. The system is based on a moving bed sand filter. A biofilm is formed on the sand grains after inoculation with heavy metal-resistant bacteria able to biosorb or to bioprecipitate heavy metals. Passage of the wastewater over these biofilms leads to the binding of the metals to the biofilm and consequently the removal of the metals from the wastewater. The metal-laden biofilm is removed from the sand grains in a sand washer created by an airlift for the continuous movement of the filter bed. The metal-loaded biomass is separated from the sand in a labyrinth on the top of the sand washer. Nutrients and a carbon source are provided continuously in the system in order to promote the regrowth of the biofilm on the sand grains. The reactor can be used for the removal of heavy metals, nitrates and some COD. The obtained biosludge contains heavy metals at concentrations of more than 10% of the dry weight. The treatment of the sludge is also taken into account. (C) 2003 Elsevier B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Hydrometallurgy	en
dc.identifier.doi	10.1016/S0304-386X(03)00161-0	en
dc.identifier.isi	ISI:000186357900029	en
dc.identifier.volume	71	en
dc.identifier.issue	1-2	en
dc.identifier.spage	235	en
dc.identifier.epage	241	en