M. Ridho Ulya, Ridho and Indra Perdana, Perdana and Panut Mulyono, Mulyono (2017) Pengaruh Penambahan Surfaktan Sodium Lignosulfonat (SLS) dalam Proses Pengendapan Nano Calcium Silicate (NCS) dari Geothermal Brine. Pengaruh Penambahan Surfaktan Sodium Lignosulfonat (SLS) dalam Proses Pengendapan Nano Calcium Silicate (NCS) dari Geothermal Brine, 11 (02). pp. 54-61. ISSN e-ISSN 2549-1490 p-ISSN 1978-287X

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Abstract

A B S T R A C T High concentration of dissolved silica in geothermal brines frequently causes operational problem in production of steam for electric generation. Hence, mitigation of silica scaling is necessary to reduce the risk of steam production failure. In the present work, silicic acid in the Dieng geothermal brine was reduced by introduction of calcium hydroxide that lead to formation of insoluble nano calcium silicates (NCS). The purpose of this work was to control size of the precipitated NCS by introducing surfactant sodium lignosulfonate (SLS) as surfactant in the Ca(OH)2 added geothermal brine. The effect of temperature (30, 50 and 70C), pH (7, 8 and 9), and surfactant concentration (0.05, 0.15 and 0.30% (w/v)) on the particle size of the resulting NCS was studied to obtain the optimum operating condition. The precipitation-sedimentation behavior of the resulting particles was measured in a vertical tube. Having measured the solid density and solution density and viscosity, average diameter of the precipitated particles was determined using Stokes principle. The calculated particle size was compared with the measurement result using particle size analyzer (PSA). The soluble silica concentration in the solution was measured using UV/Vis spectroscopy method while composition of the resulting solid particles was measured using EDX and FTIR. Experimental results showed that the dissolve silica in Dieng geothermal brine can be reduced and controlled with the addition of Ca(OH)2 and surfactant SLS. The greater the concentration of surfactant SLS results in the smaller the resulting particle size. It was found that the formation of NCS particles was accompanied with precipitation of silica and salts. The optimum condition of NCS formation was at temperature 30C and pH 9 while the concentration of surfactant SLS added to the brine was 0.3 % (w/v). Keywords: geothermal brine, nano calcium silicate, precipitation, sodiumlignosulfonate.

Item Type:	Article
Uncontrolled Keywords:	Keywords: geothermal brine, nano calcium silicate, precipitation, sodiumlignosulfonate.
Subjects:	Q Science > Q Science (General) Q Science > QD Chemistry T Technology > TD Environmental technology. Sanitary engineering T Technology > TP Chemical technology
Divisions:	Fakultas Teknik (FT) > Prodi Teknik Kimia
Depositing User:	M.Eng M. Ridho Ulya
Date Deposited:	15 Apr 2021 10:24
Last Modified:	15 Apr 2021 10:24
URI:	http://repository.lppm.unila.ac.id/id/eprint/29332

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