Details

Autor(en) / Beteiligte

• Dias, D. F. C.
• Passos, R. G.
• Rodrigues, V. A. J.
• de Matos, M. P.
• Santos, C. R. S.
• von Sperling, M.

Titel

Performance evaluation of a natural treatment system for small communities, composed of a UASB reactor, maturation ponds (baffled and unbaffled) and a granular rock filter in series

Ist Teil von

• Environmental technology, 2018-02, Vol.39 (4), p.490-502

Ort / Verlag

England: Taylor & Francis

Erscheinungsjahr

2018

Quelle

MEDLINE

Beschreibungen/Notizen

• Post-treatment of anaerobic reactor effluent with maturation ponds is a good option for small to medium-sized communities in tropical climates. The treatment line investigated, operating in Brazil, with an equivalent capacity to treat domestic sewage from 250 inhabitants, comprised a upflow anaerobic sludge blanket reactor followed by two shallow maturation ponds (unbaffled and baffled) and a granular rock filter (decreasing grain size) in series, requiring an area of only 1.5 m 2  inhabitant −1 . With an overall hydraulic retention time of only 6.7 days, the performance was excellent for a natural treatment system. Based on over two years of continuous monitoring, median removal efficiencies were: biochemical oxygen demand = 93%, chemical oxygen demand = 79%, total suspended solids = 87%, ammonia = 43% and Escherichia coli = 6.1 log units. The final effluent complied with European discharge standards and WHO guidelines for some forms of irrigation, and appeared to be a suitable alternative for treating domestic sewage for small communities in warm areas, especially in developing countries.