The article compares sewage treatment in rural areas of Suzhou and Kenya. For rural villages, it's best to treat sewage locally using anaerobic treatment and constructed wetlands. For areas near towns, sewage can go to urban treatment plants. In Kenya, a village in Machakos town improved water quality by treating sewage with an anaerobic bioreactor and constructed wetland system. This process is low-energy and easy to manage, making it effective for areas with low population density.