Abstract
In arguably the first‐ever study of its kind, a common terrestrial weed, Achyranthes aspera, has been used to treat greywater (domestic sewage) of wide‐ranging strength. The weed was used in the novel SHEFROL® (SHEet Flow ROot Level) bioreactor earlier developed by the authors, of which a patent claim has been registered. Without the use of soil or any other anchor, and at very brisk rate reflected in low hydraulic retention times of just 4–6 h, A. aspera was able to achieve substantial secondary treatment and significant primary and tertiary treatments of the greywater in a clean and inexpensive fashion. Biological and chemical oxygen demands were removed to the extents of about 81 and 84%, respectively, suspended solids to the extent of 96%, and nitrogen, phosphorous, and heavy metals, to the extent of 28–41%. © 2018 American Institute of Chemical Engineers Environ Prog, 38: 467–476, 2019
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