Pascal Mwenge and  Tumisang Seodigeng,  Greywater Treatment Using Activated Biochar Produced from Agricultural Waste.   journal   = {International Journal of Chemical and Molecular Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2019, vol. 147(3). 140 - 145
    [viewed 27 January 2022]. Available from: https://publications.waset.org/pdf/10010165.