SUSTAINABLE MINERAL MORDENITE BIOREGENERATION IN ADSORPTION PROCESS OF IRON AND MANGANESE ION IN GROUNDWATER

• Main Author: Noor Azizah, Rifka
• Format: Theses
• Language: Indonesia
• Subjects: Teknik saniter dan perkotaan; teknik perlindungan lingkungan
• Online Access: https://digilib.itb.ac.id/gdl/view/51823
• Institution: Institut Teknologi Bandung

Groundwater is one of the sources in fulfilling the primary consumption of the Indonesian people. Based on BPS data, 2019 shows that around 42% of the water sources used by the community come from groundwater (the proportion of dug wells that are protected, dug wells unprotected, and wells). High Fe and Mn content in groundwater is one of the phenomena resulting from anthropogenic activities including industrial and domestic activities. One of the sources of residential groundwater with excess iron and manganese existed in West Java. It was confirmed that the air content reached 6 mg / L for Fe and 4 mg / L for Mn.. The test results in these areas have exceeded the requirements for drinking water quality Permenkes 492/2010, namely 0.3 mg / L for Fe and 0.4 mg / L for Mn. Mordenite mineral is an alternative medium that can reduce Fe and Mn content in groundwater through the adsorption process. In several studies, mordenite is one of the Transcarpathian zeolites which has a better adsorption capacity than activated carbon in deionized water. However, in use, mordenite certainly experiences saturation. The adsorbent saturation in this study engineered using the bio regeneration principle to extend the service life of the adsorbent. Pure microorganism cultures are employed to carry out the desorption principle on the adsorbent surface. Previously, the microorganism was propagated through 9K medium and grown on an orbital shaker set at 120 rpm at room temperature for 14-29 days—the growth of strains monitored by the spectrophotometric method. After saturation used for the first adsorption, then the adsorbent is immersed in the strain media containing microorganisms. Soaking carried out for 29 days according to the bacterial growth curve. Based on the test, the adsorption stage before regeneration gave Fe removal ability up to 95.7% and post-regeneration by 75.3%. The rate of removal of iron ions was by the pseudo-second-order kinetic. Meanwhile, the adsorption isotherm follows the Freundlich isotherm principle both before and after regeneration.