Byrne, John Anthony

Fava, Natália de Melo Nasser

Fernandez-Ibañez, Pilar

Lamon, Atônio Wagner

Lubarsky, Helen

Oliveira, Milina

Pichel, Natalia

Sabogal-Paz, Lyda Patricia

Souza Freitas, Bárbara Luíza

Terin, Ulisses Costa

English

Schmutzdecke, the biofilm formed on the top of the sand bed in household slow sand filters (HSSF) is a key factor for the filters’ high efficiency in removing particles and microorganisms from water. This paper aims to investigate the extracellular polymeric substances composition (carbohydrates and proteins), biomass, dissolved oxygen, and microbial community in two types of HSSFs and identify a correlation between them and their efficiency. A continuous- and an intermittent-HSSF (C-HSSF and I-HSSF) were studied to treat river water for 48 days. Their efficiencies for bacteria (E. coli and total coliforms), turbidity, and apparent color removals were analyzed. Results clearly showed an increase of carbohydrates (from 21.4/22.5 to 101.2/93.9 mg·g−1 for C-/I-HSSF) and proteins (from 34.9 to 217/307.8 mg g−1 for C-/I-HSSF), total solids (from 0.03/&lt;0.03 to 0.11/0.19 g L−1 for C-/I-HSSF), dissolved oxygen depletion inside the filter (6.00 and 5.15 mg L−1 for C- and I-HSSF) and diversity of microorganisms over time, pointing out the schmutzdecke development. A clear improvement on the HSSFs’ efficiency was observed during operation, i.e., E. coli removal of 3.23 log and 2.98 log for total coliforms, turbidity from 60 to 95%, and apparent color from 50 to 90%.</p

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Biological Layer in Household Slow Sand Filters: Characterization and Evaluation of the Impact on Systems Efficiency

https://pure.ulster.ac.uk/files/100431953/water-14-01078.pdf

Biological Layer in Household Slow Sand Filters: Characterization and Evaluation of the Impact on Systems Efficiency:Characterization and Evaluation of the Impact on Systems Efficiency

Biological Layer in Household Slow Sand Filters: Characterization and Evaluation of the Impact on Systems Efficiency:Characterization and Evaluation of the Impact on Systems Efficiency

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