REMOVAL OF CO, SO2 AND HC GASES FROM INCINERATOR USING DIATOMACEOUS EARTH AND COMPOST-MODIFIED SORBENT IN FIXED BED ABSORPTION REACTOR

摘要

In this work, the removal of SO2, HC, and CO gases from incineration emission is conducted by means of absorption process using the low-cost sorbent based on Ca(OH)2 material. The main aim of this research is to enhance the reactivity of Ca(OH)2 sorbent by using diatomaceous earth (DE) as a source of silica and compost as a bio-sorbent. The calcium sorbent is made from hydrated lime acquired in the local area and modified with DE and compost through a simple mixing technique. Besides the effects of DE and compost addition, other variables such as sorption temperature and height of bed are also studied. The results confirm that combining Ca(OH)2 sorbent with diatomaceous earth and compost successfully enhanced the removal performance of incineration emission gases. In addition, it is also found that the height of the bed and temperature sorption influence gas absorption efficiency. At bed height of 6 cm and temperature of 150°C, Ca(OH)2/DE/compost sorbent showcase the best absorption performance of CO, SO2 and HC gases with absorption efficiency of CO, SO2, and HC gas is 48.76%, 57.53%, and 65.38%, respectively. Diatomaceous earth generally contains CaO, SiO2, and Al2O3. The reaction between SiO2 with Ca(OH)2 to form calcium silicate hydrate which has a porosity and high reactivity. The compost contains bacteria as a bio-sorbent that can convert CO to CO2 and CH4. Both of these minerals are proven to be promising supporting materials in sorbent fabrication.