A group of Arizona State University students have come up with an innovative way to make trash collection and disposal more efficient and economical. With their Hygiea sensing system, the amount of waste materials in a trash receptacle can be intensively monitored, providing information that enables users to practice effective small-scale waste management — saving time, money and resources. Surya Iyer, a graduate student in the Fulton Schools management of technology program, and Saiman Shetty, who earned a master’s degree in electrical engineering in the Fulton Schools, are involved in the Hygiea venture.