ADSORPSI Pb2+ DALAM LIMBAH CAIR ARTIFISIAL MENGGUNAKAN SISTEM ADSORPSI KOLOM DENGAN BAHAN ISIAN ABU LAYANG BATUBARA SERBUK DAN GRANULAR

Widi Astuti, Bayu Kurniawan

Abstract

Batubara merupakan salah satu sumber energi alternatif yang murah. Oleh karena itu, penggunaan batubara di Indonesia meningkat pesat setiap tahunnya. Penggunaan batubara ini menghasilkan limbah yang dapat mencemari lingkungan baik limbah gas seperti CO2, NOX, CO, SO2, hidrokarbon maupun limbah padat yang berupa abu layang dan abu dasar. Abu layang mengandung SiO2, Al2O3, dan sisa karbon yang tidak terbakar sehingga potensial digunakan sebagai adsorben. Pada penelitian ini, kemampuan adsorpsi abu layang ditingkatkan melalui aktivasi termal dan diuji untuk menjerap ion Pb2+ dalam limbah cair artifisial. Adsorpsi dilakukan pada sistem kolom yang berlangsung kontinyu menggunakan bahan isian abu layang teraktivasi, dalam bentuk serbuk dan granular, pada laju alir influen yang bervariasi. Hasilnya, laju alir mempengaruhi nilai kapasitas (qo), konstanta thomas (KtH) dan waktu breakthrough.

Kata Kunci : Pb2+ , adsorpsi, abu layang, breakthrough

Coal is one of the inexpensive alternative energy. Therefore, the usage of coal in indonesia has been increased every year. It produces waste that can pollute the environment including gases waste such as CO2, NOX, CO, SO2, hydrocarbons and solid waste including fly ash and bottom ash. Coal fly ash is composed of SiO2, Al2O3 and unburned carbon that enables it to act as a potential adsorbent. In this research, the adsorption capasity has increased by thermal activation and used to adsorp Pb2+ ion in wastewater. The adsorption was carried out in packed column contains powder and granular activated fly ash. In the system, flow rate was varied. The results show that flow rate influences adsorption capacity, Thomas constant and breakthrough time.

Keywords: Pb2+, adsorption, coal fly ash, breakthrough

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