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Nickel is one of the heavy metal that can cause respiratory problems <br /> <br /> <br /> and cancer in human health. One of the developing technologies in this area is <br /> <br /> <br /> precipitation process which is widely known for its cost-effective, ea...
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Main Author: | |
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Format: | Final Project |
Language: | Indonesia |
Online Access: | https://digilib.itb.ac.id/gdl/view/20882 |
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Institution: | Institut Teknologi Bandung |
Language: | Indonesia |
Summary: | Nickel is one of the heavy metal that can cause respiratory problems <br />
<br />
<br />
and cancer in human health. One of the developing technologies in this area is <br />
<br />
<br />
precipitation process which is widely known for its cost-effective, easy to <br />
<br />
<br />
manage, and high heavy metal removal efficiency. Based on that, this experiment <br />
<br />
<br />
was conducted with purpose for determining the type of precipitation processes <br />
<br />
<br />
that could have the highest nickel removal efficiency in plate making wastewater <br />
<br />
<br />
from printing industry. The external conditions such as pH and dosage that <br />
<br />
<br />
influence the precipitation process were also investigated. This experiment used 3 <br />
<br />
<br />
types of precipitation process, which were hydroxide precipitation, carbonate <br />
<br />
<br />
precipitation and hydroxide co-precipitation using Fe. This experiment was <br />
<br />
<br />
performed on synthetic wastewater which has initial soluble nickel content of 500 <br />
<br />
<br />
ppm. The type that had highest nickel removal efficiency would be applied on <br />
<br />
<br />
actual wastewater with initial nickel concentration up to 3317 ppm. Final nickel <br />
<br />
<br />
content was measured after the Jar Test (rapid stirring: 100 rpm for 1 minute ; <br />
<br />
<br />
slow stirring: 60 rpm for 10 minutes) and sedimentation in 2 hours preceded by <br />
<br />
<br />
reagent addition and pH adjustment. AAS (Atomic Absorption <br />
<br />
<br />
Spechtrofotomethry) was used for measuring nickel concentration. Based on the <br />
<br />
<br />
results of the study, the type of precipitation that has the best nickel removal <br />
<br />
<br />
efficiency was hydroxide co-precipitation using Fe at optimum pH 10 and <br />
<br />
<br />
optimum ratio dosage Fe : Ni was 1 : 1. This precipitation process gave nickel <br />
<br />
<br />
removal efficiency of 99.96% on synthetic wastewater and 99.93% on actual <br />
<br />
<br />
wastewater. |
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