Oil and water may not mix. But oil and revenue most certainly do. On their quest toward zero waste, many retailers overlook oil as a potential source of profit. In most of their commercial kitchens, used cooking oil is woefully wasted or simply thrown out. It needn’t be, according to alternative energy experts. Just ask Whole Foods Market or Buehler’s Food Markets. Each week, Austin, Texas-based Whole Foods repurposes around 1,000 gallons of waste cooking oil from 28 of ...

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