“COPPER REMOVAL FROM BIOLOGICAL TREATMENT SYSTEM USING MODIFIED ADSORBENT DERIVED FROM GROUNDWATER TREATMENT PLANT SLUDGE AND RICE HUSK”. Jurnal Teknologi 78, no. 5-3 (May 8, 2016). Accessed July 23, 2024. https://journals.utm.my/jurnalteknologi/article/view/8512.