PPBES + provides a modularized plant purification tank. Plants that can be purified according to the wastewater discharged from the plant are planted to facilitate the absorption of various types of heavy metals, nitrogen, phosphorus and other harmful substances to achieve the complete purification of sewage. The replaced and eliminated plants will be subjected to high-temperature liquefaction. Under the high-temperature and high-pressure environment, biomass fuel will be produced, and the biomass energy can be used to generate electricity.