| Summary: | 碩士 === 國立屏東科技大學 === 環境工程與科學系 === 93 === In Taiwan, huge amounts of granulated blast furnace slag and coal ash are produced, and they are mainly pulverized and added into the cement as the pozzolanic materials. The goal of this study is to increase additional value of granulated blast furnace slag and coal combustion products by transforming them into adsorbent that are capable of treating gaseous pollutants at low cost and with high efficiency. The main idea in this research for adding acetic acid, lactic acid, and citric acid is to utilize organic acids to destroy the hydrate structure, make it produce smaller crystal, loosen organized hydrate, increase the surface area, and improve the ability of adsorbing pollutants.
The adsorbates used were sulfur dioxide, carbon dioxide, formaldehyde, methyl alcohol and ammonia with the adsorbents prepared. Experimental
results showed that the adsorbed amount of the sulfur dioxide is best than other pollutants. The sulfur dioxide and carbon dioxide are acid gas and have similar phenomenon of adsorption. The solubility of carbon dioxide in water is relatively low and only small portion are in the form of carbonic acid so that the adsorbed amount is relatively low. Since adsorbents prepared are alkali adsorbents, they can be effective adsorbents to acid gas, such as the sulfur dioxide. The adsorbents prepared from granulated blast furnace slag are superior to that from coal ash.
The prime cost during preparation of adsorbents come from the calcium hydroxide be added and heating energy. There is much excess waste heat in the power plant and steel mill, therefore the cost of heating energy can be reduced. The adsorbents prepared are highly effective to the sulfur dioxide and less expensive if the power plant and steel mill can prepare by themselves. The waste from process can be reused and furthermore reduce the operating cost.
|
|---|
