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Hokkaido University (2015)

Reclamation of domestic greywater for agricultural irrigation by intermittent sand filter bioreactor

Charchalac Ochoa, Sebastian Ignacio

Titre : Reclamation of domestic greywater for agricultural irrigation by intermittent sand filter bioreactor

Auteur : Charchalac Ochoa, Sebastian Ignacio

Université de soutenance : Hokkaido University

Grade : Doctoral Thesis 2015

Résumé partiel
Potential adverse effects to human health, environment and purpose-related infrastructure should be considered when designing systems for treatment and reuse of greywater. Intermittent sand filtration (ISF) bioreactors are efficient systems for treatment of wastewater and are able to produce effluents of high quality. However, ISFs have potential to clog easily under uncontrolled loads of solids and organics. Furthermore, the specifications of its design are varied and generally aim to polish effluents for environmental discharge. This study discusses an approach to extend the lifetime of ISFs by incorporating a pretreatment that aims to control the size of solids loaded to the bioreactor and to design the configuration of an ISF based on standards of quality that are suitable to the agriculture reuse scenario. In Chapter 1, background and the objectives of this study were described. Greywater reuse potential, drawbacks and potential adverse effects were enumerated. Natural treatment technologies were compared and the suitability of intermittent sand filtration bioreactors for some scenarios is discussed. Challenges for an improved setup of these systems are listed. In Chapter 2, the capability of geotextile fabric filter for removal of SS from greywater and the effects of this system when used as pretreatment for ISFs were investigated. 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% to 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.

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