| Abstract | As increasing the industrial activities, accumulation of greenhouse gas in the atmosphere is
the most threaten to the environment. Especially CO2 is the outrun gas than others. The fact
that cement manufacturing basically involves many processes such as mining, transportation
and fuel combustion, it has been the highest carbon dioxide emissions plant around the
world. As the other reviews and literatures, 1 ton of cement produce 0.81 ton CO2of as usual.
There are four difference sources CO2 generated from transportation, electricity, fuel
combustion and decomposition of limestone. In this study by reducing the fuel consumption
and electricity utilization in addition substitution of natural pozzolans to the required clinker
in the new process and implementation to mitigate the CO2 emissions.
LCA is the technique to evaluate the environmental impact by considering cradle to grave
of the products such as processing, production, usage, disposal and recycling. The LCA
software Simapro and Recipe (E) midpoint, endpoint are used to evaluate and compare the
processes. The functional unit of analysis in this thesis is 1 ton of cement producing and the
limitation is gate to gate of life cycle. The inventory data of raw materials, heat and electricity
generation by combustion of the fuel are collected from the Kyankhin cement plant, which
is the case study of the thesis that used wet process production. In the changing of the wet to
dry process, the new kiln and preheater have replaced belonging the process. The required
fuel and electricity utilization amount are helped from the Kyouksal dry cement plant. In the
implementation to the blended cement, the rice husk ash is chosen as the pozzolanic
materials for the cement substitution. The involving ash are collected from the boiler of the
rice mill.
By comparing the results through the Simapro software, the result show the blended cement
is more environmental friendly than the existing process. As the achievement of the study,
the CO2 emission could be reduced from 895kg till to 411kg in the process implementing.
The others disposing such as dust and water discharging were the continuous achievement
of the study. |