(230328) -- ZHENGZHOU, March 28, 2023 (Xinhua) -- This photo taken on March 28, 2023 shows the eco-agriculture demonstration area of the No. 3 sewage treatment plant in Suixian County of Shangqiu, central China's Henan Province. The No. 3 sewage treatment plant of Suixian County, completed in 2018, is a new concept sewage treatment facility combining wastewater treatment, biomass power generation, scientific research, science popularization, and eco-agriculture demonstration functions. The high-standard recycled water processed by the plant has improved the water quality of the local Limin river. (Xinhua/Zhang Haoran)