Traditional lead battery recycling may be the world's most polluting industry. Many startup companies are looking to create new ways to recycle used car batteries using water, chemicals and electricity.

Singapore-based ACE Green Recycling has developed a room-temperature process that turns lead from scrap batteries into ingots. ACE Green Recycling uses machines that run on electricity to refine lead components from scrap batteries into briquettes, which are then cast into ingots and sold to battery manufacturers.

The new technologies are promising, but it is too early to say if any of them are commercially viable on a large scale.

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