Abstract: A biological wastewater treatment process and modular apparatus wherein activated sludge is recirculated in all of aeration, fluidized bed and return sludge phases in the apparatus.

Abstract: A biological wastewater treatment process and modular apparatus wherein activated sludge is recirculated in all of aeration, fluidized bed and return sludge phases in the apparatus.

Abstract: A biological wastewater treatment process and modular apparatus wherein activated sludge is recirculated in all of aeration, fluidized bed and return sludge phases in the apparatus.

Abstract: A process is provided for producing animal feed from food waste by providing a dry, pelletized, fibrous organic material. Specifically, the invention relates to methods of thickening/dewatering solids that contain substantial amounts of moisture, e.g., ground food waste.

Abstract: A process is provided for producing animal feed from food waste by providing a dry, pelletized, fibrous organic material. Specifically, the invention relates to methods of thickening/dewatering solids that contain substantial amounts of moisture, e.g., ground food waste.

Abstract: A method and apparatus for treating contaminated water are described wherein contaminated natural water or industrial wastewater is treated to remove contaminants in a packaged modular treatment unit.

Abstract: A method for treating heavy metal contaminated soils, particularly those containing hexavalent chromium, which includes a first soil washing at pH 9-12 with an anionic synthetic organic flocculant followed by a liquid-solid phase separation such as by gravity separation including sedimentation, an optional second soil sludge washing at pH 2.5-3.0 with addition of a metal valency reducing agent which when done is followed by a second liquid-solid phase separation using a cationic synthetic organic flocculant, combining the first and second stage liquids and optional treating the liquid phase with a metal valency reduction agent such as sodium metabisulfite under acidic conditions followed by treatment with an alkaline agent to form insoluble metal hydroxide which is separated in a phase separation process and is combined with the final sludge, recycling the liquid from washing stage or stages for use in soil processing, dewatering the separated sludge or sludges using a separation method (e.g.

Abstract: A coagulating and flocculating agent based on aluminum pentahydroxychloride for purifying and treating water and/or waste water and/or sludge and/or other contaminated liquids as well as to separate suspended and colloidal particles from liquids in industrial manufacturing processes has its activity enhanced with an inorganic or organic flocculation enhancing additive such as natural or synthetic zeolite and/or cationic, anionic and non-ionic powdered, emulsified or liquid polyacrylamide. Aluminum pentahydroxychloride is formed by treating a natural nepheline, aluminum powder, aluminum oxide or other aluminum providing material with hydrochloric acid after which it is mixed with the flocculation enhancing additive.

Abstract: A method for treating chromium ore waste contaminated soils by detoxification, fixation, immobilization and stabilization comprising the steps of soil grinding, pre-activating, reducing chromium valiancy, forming insoluble metal hydroxides, and incapsulating the chromium compounds containing agglomerates to prevent potential chromium leaching from the soil according with the standard toxicity characteristic leaching procedure requirements. Additive agents such as an acidic solution, a bivalent iron sulfur containing salt, e.g. ferrous sulfate, an alkalifying agent, e.g. calcium lime slurry or lime kiln dust or caustic, a stabilizing agent, e.g. cement, cement kiln dust, silicates, polyelectrolytes, and the like are also disclosed as assisting in the chromium immobilization reactions by reacting with certain constituents in the soil.

Abstract: A process and associated apparatus for removing contaminants such as heavy metals from contaminated water, waste water, sludge or flushed soil elutriates, or leachates. The remediation method utilizes a combination of chemical oxidation/reduction reactions and physical separation techniques employing a pseudofluidized bed and is carried out in a unitary reactor comprising zones for activation, flocculation and phase separation.