When farmland is scarce, growing seasons short and winters cold, as in the northern rim of Michigan’s Upper Peninsula, what’s to be done with a growing volume of biosolids?The Marquette (Mich.) Area Wastewater Treatment Facility answered the question with a flexible solids process that yields either Class B liquid or cake, and with diverse options for applying material in the field.“I’m all for beneficial use of biosolids,” says Curt Goodman, the city’s water and wastewater superintendent since 1994. “I refuse to landfill it. We’ve always got that option as a last resort, but it’s something I just hate to do.”Therefore,
