Ammonia removal from industrial wastewater treatment by a sequenced renewal fluidized bed reactor

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Guillaume Darracq*, Mathilde Marchand, Christel Carême, Philippe Sauvignet

The performances of zeolite to remove ammonia produced by degradation of wastes in wastewater, were measured at laboratory scale by doing tests in batch reactors as well as in treatment facilities (Renewal fluidised bed reactor). This reactor is designed to be used in ascending water flow to fluidize the zeolite bed to have a good understanding between expansion and contact time. In the industrial trials, this optimum was identified with a flow rate at 0.05 m3·h-1 and a contact time of 2 hours. In these conditions, the expansion bed is satisfying (between 8 to 10 %). The best grain size of the zeolite is between 0.3 and 1.0 mm and the adsorption capacity at lab scale was determined at 5.0 mg N-NH4·g-1. But during the industrial trials, this adsorption capacity after a contact time of 36 min reached 5.4 mg N-NH4·g-1. In conclusion, micrograin zeolite is an interesting and feasible solution to treat industrial wastewater effluents in fluidized bed reactors, allowing flexibility in treatment rate, contact time and response to variation of concentration in the effluent.  Natural zeolite (clinoptilolite) from Imerys has a high adsorption capacity for ammonium and is therefore a chemical-free and sustainable solution for the treatment of industrial effluents.

Keywords: Ammonia removal, clinoptilolite, fluidised bed reactor

Proscience vol. 9

Pp 13-18

DOI: 10.14644/EC2023.003