Treatment of Waste Water from Wet Lime (Stone) Flue Gas Desulfurization Plants with Aid of Crossflow Microfiltration

Autor:	P. Tigchelaar, Jan Bernard Lefers, W. Spiering, J. de Niet, G. D. Enoch
Rok vydání:	1990
Předmět:	Chromatography Gypsum Chemistry Process Chemistry and Technology General Chemical Engineering Microfiltration Membrane fouling Backwashing Filtration and Separation General Chemistry engineering.material Pulp and paper industry Flue-gas desulfurization Pilot plant Wastewater engineering Lime
Zdroj:	Separation Science and Technology. 25:1587-1605
ISSN:	1520-5754 0149-6395
Popis:	A treatment method has been developed to remove heavy metals such as As, Cd, Cr, Cu, Hg, Ni, Pb, Se and Zn very efficiently from waste water from wet lime(stone)-gypsum flue gas desulfurization plants (FGD). This method has been based on coprecipitation of heavy metal hydroxides and sulfides followed by crossflow microfiltration as a post-treatment. The experiments were carried out on pilot plant scale with actual waste water from a FGD plant downstream of a coal fired boiler. The effect of membrane fouling as a function of several process parameters was investigated. From SEM-EDS analysis it was found that the fouling layer on the membrane surface mainly consists of Mg-, Al-, Si-, Fe-compounds and gypsum. Membrane fouling could be decreased by periodical backwashing and by increasing the liquid velocity in the membranes. Moreover, a computer controlled start up procedure of the crossflow microfiltration unit was developed to minimize the effect of membrane fouling and to increase the operating t...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::c8353b958992551e22ed32de85fec7f2 https://doi.org/10.1080/01496399008050411 Zobrazit plný text záznamu