Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: MSWI fly ash

Sortuj według:

Ogranicz wyniki do:

Leaching of heavy metals from MSWI fly ash : experiments vs. simulation

Qiu Q, Jiang X., Chen Z., Lu S., Ni M.

Archives of Environmental Protection

2018

Vol. 44, no. 2

55--61

In this work, pH-dependence experiments and leaching modeling using Visual MINTEQ were performed to evaluate the stability and simulate the leaching characteristics of heavy metals in municipal solid waste incineration (MSWI) fly ash. Modeling the equilibrium concentration of Cd, Cu, Cr, Ni, Pb and Zn in raw and treated fly ash was the main target and was conducted over a pH range of 0.5–14. In addition, simulation of the leaching behavior of MSWI fly ash with different additives was also conducted. The treated fly ash was solidified by a microwave-assisted hydrothermal process with added phosphate. The initial elemental concentrations of MSWI fly ash, including raw and treated fly ash, were detected by a microwave apparatus and inductively coupled plasma atomic emission spectroscopy (ICP-AES). The ICP-AES analysis showed that most leaching concentrations of treated fly ash decreased considerably compared to the raw fly ash. The simulation results indicated that the dissolution/precipitation simulation models of Zn, Cu and Pb were broadly consistent with the experimental results, while the leaching behaviors of Ni, Cr and Cd were determined by both dissolution/precipitation and surface complexation mechanisms. In addition, the models of reagent solidification revealed that the stabilization effect of Na2S was better than that of Na2CO3. This model will be useful in the evaluation of the leaching concentrations of heavy metals in fly ash.

Removal of chlorides from waste incineration residues

Hartmann S., Matysek D., Stary M., Skrobankova H.

Inżynieria Mineralna

2015

R. 16, nr 1

145--150

Chlorides were removed from the medical waste bottom ash and the municipal solid waste incineration fly ash samples using washing/leaching procedure. The treatment procedures as well as mineralogical phase analysis of raw and washed/leached samples were discussed. Pozzolanic/hydraulic properties of samples were determined and discussed in relationship to bottom ash/fly ash utilization.

Chlorki zostały usunięte z próbek popiołu dennego odpadów medycznych oraz popiołu lotnego ze spopielenia miejskich odpadów stałych przy zastosowaniu procedur czyszczących/ługujących. Przeprowadzono dyskusje na temat procedur procesu, jak również analizy faz mineralogicznych próbek przed i po procesie oczyszczania/ługowania. Właściwości pucolaniczne/hydrauliczne próbek zostały określone i omówione w związku z wykorzystaniem popiołu dennego/lotnego.