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    REMOVAL AND RECOVERY OF ORGANIC MATTER AND NUTRIENTS FROM WATEWATER

     

    This line of research focuses on the removal and recovery of biological nutrients (nitrogen and phosphorus) from wastewater.

    As regards the recovery of these nutrients, the crystallization of struvite (ammonium nitrogen phosphate) has been studied for use as a fertilizer. CALAGUA has also been working on different sludge line arrangements to maximize phosphorus recovery and prevent problems caused by uncontrolled precipitation during anaerobic digestion.

    As regards the removal of biological nutrients, this line of research uses pilot plant tests and industrial WWTP data to study and optimise advanced treatment systems, such as SHARON and BABE reactors. It also addresses the fermentation of primary sludge to generate the fatty volatile acids needed to improve phosphorus removal in activated sludge systems.

    The BNRM1 model was developed on the basis of experimental studies, and enables the main biological and physical-chemical processes occurring in a WWTP to be represented. BNRM1 provides a mathematical model of the behaviour of the main bacteria in wastewater treatment, i.e. aerobic or facultative heterotrophic bacteria (denitrifier bacteria), ammonia and nitrite oxidising bacteria, polyphosphate accumulating bacteria, acidogenic bacteria and Methanogenic Archaea, and sulphate reducing bacteria. It also includes physical-chemical models of chemical equilibrium, pH changes, gas-liquid equilibrium and chemical precipitation.




     

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