The new edited volume Thinking with Soils – edited by Juan Francisco Salazar, Céline Granjou, Matthew Kearnes, Anna Krzywoszynska, and Manuel Tironi – is now available. You can download a pre-print version of my chapter here, which examines the use of biosolids (i.e. treated sanitation waste) as part of a broader trend to “close the loop” in contemporary agricultural management. The chapter is part of a larger ethnographic research project in which I’m bringing together insights from wastewater treatment experts, soil scientists, and farmers to understand both the productive possibilities and potential pitfalls of using treated sanitation waste on agricultural landscapes in the US (and beyond).