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Abstract Safely managed waste reuse may be a sustainable way to protect human health and livelihoods in agrarian-based countries without adequate sewerage. The safe recovery and reuse of fecal sludge-derived fertilizer (FSF) has become an important policy discussion in low-income economies as a way to manage urban sanitation to benefit peri-urban agriculture. But what drives the user acceptance of composted fecal sludge? We develop a preference-ranking model to understand the attributes of FSF that contribute to its acceptance in Karnataka, India. We use this traditionally economic modeling method to uncover cultural practices and power disparities underlying the waste economy. We model farmowners and farmworkers separately, as the choice to use FSF as an employer versus as an employee is fundamentally different. We find that farmers who are willing to use FSF prefer to conceal its origins from their workers and from their own caste group. This is particularly the case for caste-adhering, vegetarian farmowners. We find that workers are open to using FSF if its attributes resemble cow manure, which they are comfortable handling. The waste economy in rural India remains shaped by caste hierarchies and practices, but these remain unacknowledged in policies promoting sustainable ‘business’ models for safe reuse. Current efforts under consideration toward formalizing the reuse sector should explicitly acknowledge caste practices in the waste economy, or they may perpetuate the size and scope of the caste-based informal sector. 

Abstract India's flagship program on sanitation and hygiene – the Swachh Bharat Mission – aims to eliminate open defecation and to manage urban waste for a ‘Clean India’. The emptying of toilet pits and the transport of waste are as critical as more toilets are for sustainable sanitation. In unsewered cities of the global South, these services are mainly provided by privately run cleaning trucks. We find that the physical and social mechanisms through which these services are organized are virtually invisible in national fecal sludge and waste management policies. Based on a rich ethnography of cleaning trucks in Bangalore, India, we show that trucking operations dispose of sludge in ways that harm both public health and the environment, and that the caste composition of sanitation work helps to keep it invisible from officials and the public. We draw on the concept of the social role of disgust to explain the seen-and-unseen nature of these trucks. ‘Seeing’ sludge management as it is practiced is essential for understanding how the sanitary city is being produced and for the success of future sanitation reforms. This article has been made Open Access thanks to the generous support of a global network of libraries as part of the Knowledge Unlatched Select initiative.