Phosphogypsum (CaSO) is produced as a waste by-product during phosphoric acid production in the fertilizer industry. Only 15% of worldwide phosphogypsum production is recycled, while 85% is stored in the vicinity of factories as huge piles resulting in environmental and health hazards. An extensively studied biotransformation of phosphogypsum to calcium carbonate or calcite (CaCO) using sulfate reducing bacteria (SRBs) is a prolonged process and results in the formation of extremely hazardous HS gas.
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