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5930939 
Journal Article 
Rapid treatment of greywater (household sewage) by terrestrial weed Achyranthes aspera in SHEFROL (R) reactors 
Abbasi, SA; Tauseef, SM 
2019 
Yes 
Environmental Progress and Sustainable Energy
ISSN: 1944-7442 
WILEY 
HOBOKEN 
38 
2 
467-476 
WOS:000462079900018 
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 (R) (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%. (c) 2018 American Institute of Chemical Engineers Environ Prog, 38: 467-476, 2019 
Achyranthes aspera; greywater; sewage; SHEFROL (R); copper; nickel; manganese; zinc