Abstract: A method of purifying nutrient contaminated water for safe reuse or discharge, while recovering the fertilizer value of the contaminants. The system includes digestion tanks for the conversion by appropriate fauna and aerobic bacteria of dissolved or suspended organic contaminants into dissolved inorganic contaminants, which are flow connection with biofiltration tanks for the removal by plant root uptake of the dissolved inorganic contaminants. Generally, the digestion and biofiltration tanks are configured wherein contaminated water is conducted between one or more digestion tanks containing detritivorous or omnivorous fauna which feed on suspended contaminants and pathogens and aerobic bacteria which feed on the excreta of the fauna which will solubilize and decompose organic contaminants, oxidize nitrogen compounds into nitrates and competes with pathogens, and one or more biofiltration tanks containing pants potted in the water which uptakes dissolved inorganic contaminants.

Abstract: The present invention relates to a method to purify nutrient-contaminated water for safe reuse or discharge, while recovering the fertilizer value of the contaminants. The core components of the invention are digestion tanks for the conversion by appropriate fauna and aerobic bacteria of dissolved or suspended organic contaminants into dissolved inorganic contaminants, which are flow-connected to biofiltration tanks for the removal by plant root uptake of dissolved inorganic contaminants.

Abstract: Methods and systems that remove impurities from phosphogypsum (PG), including from radium and heavy metal salts, and produce gypsum binders and products. In one embodiment, PG is reacted with a chloride solution in an acidic environment under mechanical manipulation and/or heat followed by galvanic and/or zeolite absorption removal of impurities.

Abstract: Methods and systems that remove impurities from phosphogypsum (PG), including from radium and heavy metal salts, and produce gypsum binders and products. In one embodiment, PG is reacted with a chloride solution in an acidic environment under mechanical manipulation and/or heat followed by galvanic and/or zeolite absorption removal of impurities.

Abstract: Methods and systems that remove impurities from phosphogypsum (PG), including from radium and heavy metal salts, and produce gypsum binders and products. In one embodiment, PG is reacted with a chloride solution in an acidic environment under mechanical manipulation and/or heat followed by galvanic and/or zeolite absorption removal of impurities.

Abstract: Methods and systems that remove impurities from phosphogypsum (PG), including from radium and heavy metal salts, and produce gypsum binders and products. In one embodiment, PG is reacted with a chloride solution in an acidic environment under mechanical manipulation and/or heat followed by galvanic and/or zeolite absorption removal of impurities.