Raw and Treated Coal Fly Ash Amendment Aiming for Water Holding Capacity Adjustment of Natural Soils

Abstract

ABSTRACT:The effects of raw and treated coal fly ash (FA) amending on water holding capacity (WHC) of natural soils were investigated. Apatite mineral was synthesized on FA particles or FA surface was modified by chitosan, sodium alginate, or guanidine hydrochloride. WHC was measured as cumulative water retention during 12-hour drying experiments at 40°C or under natural condition. Experimental results suggest that raw FA amendment at lower temperature is preferable to increase soil WHC. On the other hand, inorganic and organic treatments gave FA positive dependency on temperature. Such treatments are more effective to increase soil WHC at higher temperature. This research found no correlation between WHC and water repellency of FA.

Quantitative Investigation on Pyrolytic Behaviors of Agricultural Residues from Rice Husk and Various Performances of Their Relevant Ash Residues

“…Yet despite all that, energy generation from biomass waste produces a considerable amount of biomass ash containing a variety of heavy metals which, under certain conditions, can leach out and give rise to pollution on disposal [8,9]. Fly ash and bottom ash are the two major by-products from biomass power plants [10]. Besides, it is well known that the biomass ashes also contain a great deal of alkali and alkali earth metals that may result in problems of fouling, slagging, and corrosion on the surface of thermal conversion equipments.…”