Geotube – Filtration – October 2018

Geotube – Filtration – October 2018

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Lieu de l’étude de cas

Cox's Bazar - Bangladesh

Principaux objectifs de traitement

BOD/COD reduction, Pathogen reduction, Solid/liquid separation, TSS and TDS reduction

Description du processus de traitement

Put in practice measure and predispositions for eventual upgrade/decommissioning
Upgrade/decommissioning methodology (internal team or contractor, tender or employment procedure and challenges)
Upgrade/decommissioning methodology and resources
Resources temporally needed for upgrade/decommissioning (electricity, water, special vehicles, access permission, legal permission)
Needed remediation activities in case of decommissioning
Specific security and safeness during upgrade/decommissioning (type of PPE, specific rules, responsibilities, challenges)

Description du contexte d’urgence

The project site – Unichiprang is a hilly area and is currently hosting an estimated 21,300 Rohingya refugees (ISCG Full Situation Report, 11 March 2018). Refugees are continuing to cross the border into Bangladesh, with a total of 3,236 new arrivals reportedly entering the country in February 2018 alone, bringing the number to over 5,000 newly arrived refugees so far in 2018. The population is predominantly Muslim. The latrines provided for the refugees are simple pit latrines. Pits are emptied approximately every 4 to 8 weeks depending on the number of users.

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Leçons apprises

It is essential that the community is informed about the risks related to faecal sludge before the desludging process is initiated. The community needs to be aware of the need to keep a safe distance during the operations, for them and their children and can be part of the planned hygiene promotion activities. Additional awareness raising measures are required to avoid pit latrines being used for solid waste. PPE should be worn and training for involved staff is needed to ensure safety and the proper functioning of the technology.

This technology is appropriate for the stabilisation of faecal sludge in the acute phase of an emergency and can be implemented quickly, where the appropriate geotextile and good quality lime (CaOH2) is available. The infrastructure is not permanent. Once there is land available, the capacity of the system can easily be scaled up by increasing the number of barrels, geotextile tubes and infiltration beds. It is effective in decreasing the sludge volume (through dewatering) which is especially important when sludge needs to be transported elsewhere for end-use or disposal.


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