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Influence of Lead on the Precipitation of Zinc in Synthetic Industrial Wastewater

An efficient procedure of treating municipal solid waste is incineration which enables reduction of the waste volume, and energy recovery during combustion. During this process, fly ashes are produced.

Incineration is an efficient method for energy recovery of municipal solid waste. Usually, the resulting toxic fly ash is disposed of as hazardous waste. Consequently, the metals, mainly Zn, but also Pb, Cu, Hg, Cd, Cr, As, and Ni, which occur in the fly ash, get lost for circular economy. A new procedure called SPOP (specific product oriented precipitation) is a novel energy-efficient way to recover the metals. In this study, we present the effect of Pb on the precipitation of Zn in a model system after applying the SPOP process. For this purpose, four different experiments are carried out with Pb-concentrations varying between 0 - 40% Pb of Zn concentration. Therefore, a synthetic aqueous solution was prepared according to the main composition of the wastewater from the municipal solid waste incineration (MSWI) plant in Ingolstadt, Germany. The results show, that Pb has only little effect on the precipitation of Zn. The rate of water purification is even slightly increased in presence of Pb. The formation of the mineral gordaite (NaZn₄(SO₄)(OH)6Cl*6H₂O) as main phase in all experiments, is not dependent on the Pb concentration. Laurionite (Pb(OH)Cl) is the only Pb-containing phase; it was observed using XRD at 40% Pb in the solution, and already at 5% Pb using FTIR.

Copyright:	© Lehrstuhl für Abfallverwertungstechnik und Abfallwirtschaft der Montanuniversität Leoben
Quelle:	Recy & Depotech 2018 (November 2018)
Seiten:	8
Preis:	€ 4,00
Autor:	Kai Tandon Prof. Dr. Soraya Heuss-Aßbichler Iphigenia Anagnostopoulos
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