Geotextile

Wastewater

Filtration (mathematics)

Engineering

Statistics

Geotechnical engineering

Materials science

Archaeology

Clogging

Total suspended solids

Filter (signal processing)

Geology

Polypropylene

Waste management

Environmental engineering

Mathematics

Effluent

Environmental science

Greywater

Composite material

Suspended solids

Chemistry

Pulp and paper industry

Chemical oxygen demand

Electrical engineering

History

Journal of Water Reuse and Desalination

Intermittent sand filtration (ISF) is an efficient system for treatment of greywater; however, the high quality of effluent and the simple set-up contrast with the high failure rate due to clogging of surface layers. The efficacy of several polypropylene non-woven geotextiles (apparent opening size from 0.10 to 0.18 mm) used as primary treatment filters to remove suspended particles from domestic greywater and the effects of this pretreatment in the performance of fine and small media size (0.3 and 0.6 mm) ISFs was examined. Results showed geotextile achieved suspended solids (SS) removal rates from 25 to 85% and chemical oxygen demand (COD) from 3 to 30%; although the portion larger than 75 μm was removed at higher rates (55–90%), particles smaller than the nominal pore size of the filter were also captured. Geotextile used as pretreatment resulted in improvement of lifetime of the ISFs over an experimental run of 60 days. The vertical profile of volatile organic matter in the ISFs was evaluated at the end of the experiment and it showed a clear reduction in the accumulation of organic material on the top layer of the ISFs, effectively avoiding its early failure by accumulation of solids.

Treatment of domestic greywater by geotextile filter and intermittent sand filtration bioreactor