소각비산재를 이용한 흡착제 제조 및 중금속 흡착특성

초록

The disposal of MSWI(Municipal Solid Waste Incinerator) ashes has induced serious environmental problems because of their large amounts discharged. Therefore, many technologies have been studied to detoxificate, reutilize and dispose of them. In our study, we synthesized zeolite-like adsorbent with MSWI ash by means of hydrothermal processing. We use the concentration of NaOH, a reaction temperature and a reaction time in a reactor and a autoclave as principal variables. The phase of adsorbent after synthesis was identified by X-ray diffraction(XRD), and their morphology was examined by scanning electron microscopy(SEM). And also cation exchange capacity(CEC) were analyzed by ammonium acetate method. The maximum CEC value was obtained under the condition of 3N NaOH, 100℃ and 12hr reaction. Its value was 62.13meq/100g at this condition, which was 7 times higher than that of raw fly ash. The BET surface area of adsorbent lead to maximum value at the same condition. We conducted adsorption experiment to evaluate the adsorption capability of synthesized adsorbent. The experiment to remove heavy metals, such as Pb and Cu in waste water was carried out. According to the results, approximately 70% of Pb was removed at pH 7. Therefore, MSWI ashes could be used as raw material of adsorbent for heavy metals.

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