The impact of increasing the incinerator ash content on landfill site biostabilisation

Lo, Huang-Mu (1999) The impact of increasing the incinerator ash content on landfill site biostabilisation. University of Southampton, Doctoral Thesis.

Abstract

The results of ash characterisation showed that the total carbon (TC) and total nitrogen (TN) in different sieved particle sizes increased as the particle size decreased. The average total content of the heavy metals Cu, Cd, Pb, Zn, Ni and Cr was 7786, 29, 994, 4006, 224 and 226 μgg^-1 respectively. The leaching results of 10 g bottom ash mixed with 500 ml distilled water using tumbling and reciprocating shaking showed that the leaching concentration was in the range of 0~11 μgg^-1. Leaching from the ash was greater at the extremes of pH and temperatures these having the greatest effect on leachate concentrations of Zn, Pb, and Cu. An inhibitory effect of heavy metals was shown at a 50% levels for Zn, Cu and Ni of 650mg Znl^-1 dry solid sludge, 360 mg Cul^-1 and 40 mg Cug^-1 dry solid sludge and 380 mg Nil^-1 and 39 mg Nig^-1 dry solid sludge respectively. Bottom ash showed potential adsorption capacity for organic matter which was influenced by ash concentration, pH, temperature and particle size. the adsorption capacity increased as the ash concentration, pH, temperature, and particle size decreased. The anaerobic co-digestion of bottom ash and a simulated domestic refuse showed the beneficial effect of bottom ash addition. These studies were conducted in laboratory scale anaerobic digesters with a retention time of 20 days. Four reactors were used, two of these (controls) had no ash addition whilst the other two had ash added with the batch fed refuse simulant in a ration of 25/100 and 50/100 respectively.

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