An innovative biological treatment process with fixed bacteria to treat wastewater with high ammonia concentrations is presented. The process is realized in the presence of low values of dissolved oxygen, resulting in the production of neutral, molecular nitrogen gas with very low sludge
production. Typical wastewater to be treated by this process are characterized by high ammonia concentration (500 – 2000mg NH4-N/L) and the absence or limited presence of biodegradable carbon. Being developed applying a semi-synthetic wastewater simulating a digested
sludge centrate, the process has been tested on leachates from household landfills. The objective of this publication is to present results obtained on these leachates, which differ according to age or storage duration in their composition, i.e. in their C/N ratio. This allows to determine
experimentally the limits of the developed process with respect to the level of biodegradable carbon.
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