Carbonation of Basic Oxygen-Furnace Slag with Metalworking Wastewater in a Slurry Reactor
Date Issued
2011
Date
2011
Author(s)
Chiu, An-Chia
Abstract
CO2 sequestration by basic oxygen slag in a slurry reactor containing metalworking wastewater was investigated in this study. There were two types of metalworking wastewater used in this study including effluent from metalworking wastewater treatment plant and cold-rolling wastewater.
The effect of operational conditions on the CO2 sequestration process were evaluated including the type of metalworking wastewater, reaction time, liquid to solid ratio and CO2 flow rate. The results indicated that basic oxygen slag in cold-rolling wastewater provided a better carbonation conversion approximate 89.18% at reaction time of 2 h, liquid to solid ratio of 20 and CO2 flow rate of 1
L/min. The developed surface coverage model for CO2 sequestration was used in this study to evaluate the carbonation conversion process. Although there were
insignificant differences between wastewater and tap water in carbonation conversion, reuse of metalworking wastewater as feedstock recycles the water resource and
reduces operational cost. It is a promising alternative for carbon sequestration.
On assessment aspect, the commercial value of CO2 sequestration technology by technical assessment was confirmed. LCA software, i.e., Umberto 5.5 is a useful tool
for environment analysis and quantifying the different environmental impact categories by combining international database, i.e., CML with interior statistics. The results indicate that the sequestration of aqueous carbonation by slurry reactor is more efficient than literature. Although it still has room to reduce CO2 emissions from experiment, this study is a feasible technique due to the highest conversion rate (89.18%) without extra consumption of energy and resources.
Subjects
CO2 sequestration
slag
metalworking wastewater
surface coverage model
carbonation conversion
slurry reactor
LCA
Type
thesis
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