STUDI OPTIMASI PROSES PRESIPITASI LOGAM NIKEL PADA AIR LIMBAH PEMBUATAN PLAT CETAK

• Main Author: Khrisnasari, Ajeng
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik saniter dan perkotaan; teknik perlindungan lingkungan
• Online Access: https://digilib.itb.ac.id/gdl/view/34696
• Institution: Institut Teknologi Bandung

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