Department of Civil and Environmental Engineering at University of Virginia
MDrop or MadiDrop is a water disinfection tablet.
The M-Drop is a porous ceramic tablet embedded with silver and/or copper nitrate. It is placed in a household drinking water storage container for water disinfection.
Goal 6: Clean water and sanitation
People without access to safe drinking water.
M-Drop tablets are manufactured from clay, sawdust, silver and/or copper nitrate, pressed into shape and fired to a ceramic state
Patent protected patent number: WO2014071346 A1
Active chemical and concentration (%) of the product (not the concentration of the treated water)
Form of the chemical disinfection
Does the water flow through a treatment system or does it remain in a container?
Is the dose of the chemical administered automatically or manually?
Manufacturer-specified dosing quantity
Manufacturer-specified time until water is potable, measured in minutes
Remaining level of chemical concentration after manufacturer-specified contact time
Laboratory-evaluated log scale removal rate of bacteria
Laboratory-evaluated log scale removal rate of viruses
Laboratory-evaluated log scale removal rate of protozoa
Reduction levels of heavy metals and/or arsenic through this treatment system
How long can the treated water remain protected and safe to drink?
Manufacturer-specified maximum level of inlet turbidity (NTU)
M-Drop is a small tablet of porous clay embedded with silver. When placed in water silver ions are released gradually and disinfect waterborne pathogens. Silver concentration is below 0.01 mg/L and a 6 log in bacteria reduction and 1 log virus and protozoa reduction can be achieved after 10-24 hours, depending on how contaminated the water is.
Weight: 50 grams; Length: 9.0cm; Height: 1.7; cm; Width: 3.5 cm.
The M-Drop is placed in the water storage container and left there for 6 months. The user should avoid moving the M-Drop from container to container as this will reduce its effectiveness. The M-Drop works best when left in a container for at least several days, preferably weeks and months. The water storage container can be cleaned as needed. The M-Drop should be handled as little as possible to prevent the oil on skin from clogging the pores but it can be cleaned by rubbing it between hands, or gently scrubbing it with a clean brush. The user must remember to replace the M-Drop after 6 months.
A supply chain is needed to purchase additional or replacement MadiDrops locally.
Approximately 6 months; To discard a M-Drop simply throw away into the trash, or break it into pieces and disperse them on the ground.
Performance targets 6 log bacteria removal, 1 log virus and 1 log protozoa removal.
Manufacturer reports silver elution is below USEPA secondary guideline values of 0.1 mg/L.
Can be used in conjunction with boiling or filtration technologies to prevent post-treatment contamination during storage.
Depends on local market regulations. MadiDrop offers support to distributors and resellers to obtain local certification.
Field & Laboratory evaluations, see academic research.
Video on M-Drop.
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