#TITLE_ALTERNATIVE#

• Main Author: KHRISNASAR ( 15311008 ), AJENG
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/20882
• Institution: Institut Teknologi Bandung

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.