TECHNOLOGY FOCUS - ENVIRONMENT - Preferred Component: The waste stream/slurry is an output stream from an upstream waste treatment unit. It is a sewage and/or partially treated sewage.The waste treatment unit is a biodigestor.The biomass is selected with regards to maximizing removal of contaminants (i.e., heavy metal) from the land mass; maximizing the amount of biomass produced in order to maximize renewable energy and fuel recovery from the harvested biomass; and growing cash crops that are not affected adversely by contaminants in the land mass.A fast growing biomass with an extensive root system is selected to maximize absorption or stabilization of contaminants (i.e., heavy metal).The biomass is selected from hyperaccumulator species that release chemicals that solubilize heavy metals in the land mass, improving take-up of the soluble heavy metals into biomass.The land mass is biosolids produced at a sewage treatment plant, or at a lagoon treatment unit at a sewage treatment plant.Preferred Method: The system further includes producing:(i) a recoverable energy and fuel source (i.e., methane, biodiesel and ethanol),(ii) the waste stream/slurry, and(iii) biosolids with low levels of contaminants in the waste treatment unit; treating harvested biomass in a gasifier to recover energy from the biomass and an ash product containing valuable constituents, i.e. heavy and precious metals; and recovering heavy metals from the ash product.The system can also include supplying additives that can solubilize heavy metals in the land mass; adding biological species to the land mass to improve biochemical mobility of heavy metals; and adding fungi (i.e., white rot) to the land mass to increase the surface area of the root system of biomass to increase heavy metal uptake.The system can also include mechanically working the section of the land mass to improve aeration of the land mass; and repeating the biomass crop cycle sequence of planting, growing, and harvesting biomass to progressively reduce the levels of contaminants in the sections of the land mass and in the waste streams/slurries discharged onto the land mass with each biomass crop cycle.The system can also include removing a top layer of the biosolids after the levels of contaminants in the top layer has been reduced to a pre-determined level by the above-described biomass crop cycle sequence; composting the removed decontaminated top layer of biosolids with green refuse, i.e. harvested biomass, generating heat to reduce pathogen levels in the finished compost to produce a nutrient rich product; treating biosolids in a gasifier to recover energy from the biosolids and an ash product containing valuable constituents, i.e. heavy metals; and recovering heavy metals from the ash product.The system can also include planting biosolids in a section of the biosolids to retain water in the biosolids to facilitate growth of the biomass and dewaters the biosolids; treating biosolids and/or biomass i n a gasifier to recover energy from the biosolids and the biomass and as ash product containing valuable constituents, i.e. heavy metals; and recovering heavy metals from the ash product.Preferred Condition: The treated effluent produced after harvesting the biomass from the land mass is supplied to a nanofiltration system, reverse osmosis system, or a desalination unit to further reduce the levels of contaminants in the treated effluent.