CEDRIG Light
Rapport PDFConstruction of a water treatment plant and sewer system for the Guaqui town, Department of La Paz / Municipality of Guaqui
Vue d'ensemble
Informations Générales
Auteur
Roberto Méndez
Dernière mise à jour
juin 2018
Objectif général
Improve the current living conditions of Guaqui's inhabitants through the implementation of an appropriate sewage system, benefiting the overall population (perspective for the next 20 years)
Pays
- Bolivie
Budget
Bs. 7.000.000 (approximately USD 1'000'000)
Durée de l’activité
September 2016 - July 2017 (approximately 10 months)
Sommaire
Description
Due to the absence of a wastewater treatment plant treatment plant in the Guaqui town, wastewater is discharged directly to Titicaca Lake, causing serious water pollution. Through the construction of a sewage treatment plant, the water pollution will be reduced along with an improvement of the living conditions of the local population. However, as a result of frequent lake level fluctuations, the sewage treatment plant might suffer negative impacts from flooding. In addition, frosts during the cold winter months can affect the plant's main components such as (i) sewage collection network and sewer manhole, (ii) emissary, (iii) pumping sump, (iv) pumping line, (v) treatment plant, (vi) infiltration ditches.
Termes clés
- Wastewater treatment system
- sewage collection network
- emissary
- pump stations
- lake contamination
- Bolivia
- Floods
- frosts
Secteurs d’intervention
- Santé
- Tourisme
- Eau et assainissement
Documents
Images
Perspective des risques
Aléas dûs à la dégradation de l’environnement
Nom de l'aléa
Pollution de l’eau (en surface et souterraine)
Exposition
Pas sûr
Conséquence
Laminar erosion of contaminated soils and effluent infiltration could result in contamination of surface and groundwaters to the detriment of uncovered populations
Probabilité
Peu probable
Gravité
Nuisible
Importance du risque
Risque faible
Nom de l'aléa
Dégradation (terres, sols, écosystèmes, biodiversité)
Exposition
Oui
Commentaires
Altiplano zone with various erosional processes caused by wind (60%) and water (40%), relief with slopes between 2 and 10%.
Conséquence
Silting of network, pumping sump and treatment plant
Probabilité
Probable
Gravité
Peu nuisible
Importance du risque
Risque faible
Aléas naturels (hydro-météorologiques et géologiques)
Nom de l'aléa
Inondations
Exposition
Oui
Commentaires
According to the local hazard map, the water treatment plant is located in a flood prone area. Flood events occurred in 1986, 2002 and 2012. Approximately every 15 years.
Conséquence
Damage of the wastewater treatment plant components such as pumping sump. Overflow of stabilization lagoons would contaminate crops near the plant
Probabilité
Très probable
Gravité
Très nuisible
Importance du risque
Risque élevé
Conséquence
Damage to crops and animal fodder in surrounding areas due to flooding
Probabilité
Probable
Gravité
Nuisible
Importance du risque
Risque moyen
Nom de l'aléa
Froids extrêmes
Exposition
Pas sûr
Commentaires
At the project site, between 90 to 180 days per year with frosts are observed, 3'835 m above sea level, average temperatures around 4°C, minimum temperatures until -10°C. It happens on average every 2 years.
Conséquence
Problems in the operation of the plant and reduced efficiency of the oxidation lagoons
Probabilité
Probable
Gravité
Nuisible
Importance du risque
Risque moyen
Aléas dûs aux changements climatiques (et à la variabilité du climat)
Nom de l'aléa
Changements dans la fréquence et l’intensité des phénomènes météorologiques extrêmes (ex : vagues de froid ou de chaleur, inondations, sécheresses, tempêtes, ouragans, cyclones)
Exposition
Pas sûr
Commentaires
There are variations of extreme temperatures, mainly frost with a tendency to increase in the future
Conséquence
It could affect the operation and efficiency of the wastewater treatment plant in oxidation lagoons
Probabilité
Peu probable
Gravité
Nuisible
Importance du risque
Risque faible
Évaluation détaillée des risques nécessaire ?
Perspective des impacts
Estimer l’impact sur l’environnement
Milieu environnemental
Eau
Élément de l’activité
Wastewater treatment plant
Impact sur l’environnement
Bad odors from the plant could disturb the surrounding population
Estimer l’impact sur les risques de catastrophe
Élément de l’activité
Wastewater treatment plant
Nouveau risque ou risque accentué
Could be an incentive for the construction of new settlements in areas at risk from flooding
Estimer l’impact sur les changements climatiques
Élément de l’activité
Wastewater treatment plant
Impacts sur les changements climatiques
Greenhouse gas emissions from oxidation lagoons
Commentaires
Domestic sewage is untreated and are discharged into the fields/grounds and lake