Lysimeter Washing of Msw Incinerator Bottom Ash

Abstract

Stockpiled municipal waste incinerator bottom ash is frequently considered for utilization as a construction material. Two 360 kg lysimeter experiments were conducted to study percolation washing of contaminants from stockpiled MSW bottom ash. One lysimeter was leached with a concentrated sodium hydroxide solution, as a possible pre-treatment for improvement of the bottom ash characteristics prior to utilization, while the other was leached using distilled water. The lysimeter leachate was analysed, and at the end of the 2-year leaching period, the bottom ash from each lysimeter was subjected to several laboratory tests to assess the effect of the treatments. The laboratory tests showed that distilled water leachability of both treated ashes was an order of magnitude lower than that of fresh ash, but long-term contaminant leachability under acidic conditions had not changed. Although alkaline washing clearly resulted in greater contaminant removal than did distilled water washing, the chemical properties of the alkaline-leached bottom ash were not significantly different from those of the water-leached ash.

Characterization of Municipal Solid Waste Incineration Residues From Facilities with Different Air Pollution Control Systems

“…MSWI offers a reduction in both the mass and volume of waste subjected to final disposal, as well as the possibility of energy recovery; waste mass is reduced approximately 70%, and volume by about 90%, and it provides energy that can be recovered to produce electricity or steam. 1 Current regulations governing the operation of MSWI try to reduce adverse human health effects and control environmental impacts. A consequence of MSWI is the generation of residues such as bottom ashes, fly ashes (particulate matter carried over from the furnace and removed from the flue gas without injection of sorbents), and Air Pollution Control (APC) residues (combined materials collected in electrostatic precipitators or fabric filter devices, including fly ash, injected sorbents and flue gas condensate).…”

“…Many studies have shown the presence of such toxic metals as Cd, Pb, Cr, Zn, Hg, and soluble salts, and have studied the leaching behavior of these types of wastes. 1,[7][8][9][10] Several works 11,12 have surveyed heavy metal distribution in APC residue as a function of particle size, showing that the most volatile elements, except Hg, tend to concentrate on the smallest particles. These results are in agreement with the assumption that IMPLICATIONS Improvements in flue gas cleaning by modern incinerators produce APC residues with higher metal solubility than fly ash.…”

Enrichment of elements in industrial waste incineration bottom ashes obtained from three different types of incinerators, as studied by ICP-AES and ICP-MS

“…Therefore, much research has been carried out in terms of recycling utilization of incineration bottom ash derived from municipal solid waste. [3][4][5] Generally, such ashes are used as secondary building materials for road construction or as raw materials in the ceramic industry, because their compositions of major and minor constituents are quite similar to basaltic and other geological materials. 4 However, incineration bottom ashes generally contain many kinds of heavy metals, although the concentrations of the more volatile elements such as Zn, Cd, and Pb are 1-2 orders of magnitude lower than those in fly ash.…”

A study of the application of residue from burned biomass in mortars

“…These defects are broadly evaluated by microscopic analyses, mainly by scanning electron microscopy, which provides important data on mortar studies. On the other hand, the major concern regarding the utilization of these materials is the environmental impact they can cause [6][7][8][9][10] . Experiments carried out during three years on road constructions under real conditions 7 , have shown a low contribution of bottom ash on the composition of the percolation water.…”