The machine is used to deal with kitchen waste at a residential community in Zhengzhou, Henan province. [Photo by Wei Qianli/chinadaily.com.cn]

A staff member explains to the children how to classify different kinds of garbage. [Photo by Wei Qianli/chinadaily.com.cn]

A residential community in Zhengzhou, Henan province, aims to turn trash into treasure. [Photo by Wei Qianli/chinadaily.com.cn]

A residential community in Zhengzhou, Henan province, aims to turn trash into treasure. [Photo by Wei Qianli/chinadaily.com.cn]

A residential community in Zhengzhou, Henan province, aims to turn trash into treasure. [Photo by Wei Qianli/chinadaily.com.cn]