Abstract
Hydrothermal reaction of fly ash with slaked lime produces a porous briquette which is composed of amorphous calcium silicate, tobermorite and hydrogarnet. The molar ratio (calcium oxide)/(silicon dioxide), 0.3 in the synthesized briquette is essential for obtaining high ability for carrying microorganism. Biochemical oxygen demand (BOD) and chemical oxygen demand (COD) indices in an artificial non-fecal drainage conducted with the porous briquette decrease more rapidly than those conducted with concrete blocks; decrease behavior in the use of the briquettes is similar to that in the use of activated charcoal. The briquette samples inoculated at low and medium temperatures are effective in cleaning up water at low and medium temperatures, respectively. X-ray photoelectron spectroscopy (XPS) spectra and scanning electron microscope (SEM) images of the briquette samples ensure that these samples are covered with biological membrane. These results indicate that the calcium silicate briquette produced from fly ash can be effectively used as a carrier of microorganism for the prevention of water pollution.
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