COPPER REMOVAL FROM BIOLOGICAL TREATMENT SYSTEM USING MODIFIED ADSORBENT DERIVED FROM GROUNDWATER TREATMENT PLANT SLUDGE AND RICE HUSK. J. Teknol. [Internet]. 2016 May 8 [cited 2024 Dec. 19];78(5-3). Available from: https://journals.utm.my/jurnalteknologi/article/view/8512