Analysis of the evolution of ultra-filtered water quality in a drinking water distribution system by particle size distribution: Influence of pre-ozonation
Metadatos
Mostrar el registro completo del ítemAutor
Álvarez Arroyo, Rocío; Pérez Pérez, Jorge Ignacio; Ruiz, Luz Marina; Gómez Nieto, Miguel ÁngelMateria
Drinking water distribution system Particle size distribution Pre-ozonation UF membranes
Fecha
2023Referencia bibliográfica
Álvarez‐Arroyo, R., Pérez, J. I., Ruiz, L. M., & Gómez, M. Á. (2023). Analysis of the evolution of ultra‐filtered water quality in a drinking water distribution system by particle size distribution: Influence of pre‐ozonation. Water Environment Research, 95(2), e10840.[https://doi.org/10.1002/wer.10840]
Patrocinador
Spanish Ministry of Science and Innovation, Grant/Award Number: CTM2010-18899-TECNOResumen
An experimental drinking water distribution system (DWDS) was used to evaluate
the evolution of particle size distribution (PSD) and basic quality parameters
of ultrafiltered water with or without pre-ozonation. An ultrafiltration
(UF) module was set up, associated with a pre-ozonation system (3.7 g O3/m3).
The permeate was circulated in the DWDS (300 m; 0.9 m/s) with 0.4 mg/L of
chlorine, and the analysis of the PSD was performed using a β-variable mathematical
model. A better control of membrane fouling was obtained with preozonation,
and PSD was necessary to observe water quality differences
between permeates and in the DWDS. A decrease in particle concentration of
1.8 logarithms was obtained with the application of UF membranes, while a
decrease of only 1.2 logarithms was obtained with pre-ozonation. The system
without pre-ozonation showed a higher efficiency at removing smaller particles
(around 2 μm), with the absence of particles larger than 23 μm during
both stages. The PSD revealed a worsening of water quality in the DWDS with
an increase of particles smaller than 5 μm during the application of UF membranes,
while with pre-ozonation, all particle sizes analyzed increased their
concentration.
Practitioner Points
• Pre-ozonation led to a better control of membrane fouling, but a worsening
of permeate quality according to particle size distribution.
• Pre-ozonation does not improve the turbidity, dissolved organic carbon or
UV254 removal capacity of ultrafiltration during drinking water treatment.
• Particles size distribution reveals the deterioration of water quality in a
drinking water distribution system better than turbidity or DOC.
• Ozone prior to ultrafiltration membranes led to a worsening of permeate
quality, more significant in the drinking water distribution system.