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Adsorption of ammoniacal nitrogen from pretreated landfill leachate on clinoptilolite.

Bolaki Maria-Ilianna

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Summary

The future management of waste is to reduce its production and by extension, to their continued reuse. Through the site planning and operation of landfills, it’s necessary to control the leachates resulting from the decomposition of waste and precipitation. The pH of leachate is affected by changes in the composition of the waste or the presence of chemical compounds in it, environmental conditions and mainly by the operating time of the landfill or by technical interventions. One of their qualitative characteristics is their concentration in ammonia nitrogen (NH3-N), which in aqueous solutions is converted to ammonium cations (NH4+) and clinoptilolite, known for its high adsorption capacity for cations, including NH4+, can be used to bind it. It is a subcategory of zeolites, minerals that are found in abundance, nationally and globally, and therefore easy and affordable to obtain. In this thesis, the investigation of NH3-N removal is chosen through the process of physicochemical adsorption from clinoptilolite in batch reactors, so that the units produce a water effluent with a low ammonia concentration that can be safely discharged to the water recipient or recirculated to the unit. Four samples of clinoptilolite have been examined, 1g and 2g of chemical treated, 1g ofchemical and thermal treated, 1g washed and air- dried per 200mL of aqueous NH3-N solution and per 200mL of leachate, pre-treated with reverse osmosis, was carried out, which was supplied by the leachate treatment unit (LTU) of the Mavrorachi landfill site.The aqueous solutions had a low initial NH4+ concentration, between 8 and 15mg/L, and different pH conditions, from 4 to 8, values commonly found in leachates. The measurements demonstrated the rapid adsorption of NH4+, achieving over 50% percent removal in the first 10 minutes in the majority of clinoptilolite samples, while complete (100%) removal was achieved before the end of 3 hours. Measurements from the pretreated leachate were similar to those of adsorption from aqueous NH3-N solutions of higher concentration, achieving an average of 65% removal from 10 minutes and reaching up to 94% in the last measurement of 180 minutes. In conclusion, NH3-N adsorption from leachate as an additional treatment in a landfill leachate treatment plant enhances safe discharge to natural recipients or their reuse in the plant itself, while also providing solutions to a drinking water plant that needs to comply with stricter legislative limits.

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