Rückgewinnung von Ammonium und Phosphat aus Deponiesickerwässer mittels ILS-Verfahren
Research output: Thesis › Master's Thesis
Landfill leachates (DSW) contain numerous dissolved components due to their interaction with the waste including the nutrients ammonium (NH4+) and phosphate (PO43-). In Austria, DSW must be treated and also emission limit values must be complied before they can be discharged into running water or a public sewage treatment plant. Due to the current treatment of wastewater, large quantities of the nutrients NH4+ and PO43- are lost under high energy and high costs. In the context of this work it was investigated whether there is a possible potential for the recovery of NH4+ and PO43- from DSW in Austria, whether the ion exchanger-loop-stripping process (ILS-Process) for the simultaneous recovery of NH4+ and PO43- can be applied to DSW, and which DSW are suitable for this. A characterization of 11 DSW samples from Austrian landfills with a high content of biodegradable substances with regard to NH4+ and PO43- was performed. For this purpose, an analysis method specially adapted for the ILS method based on the natural zeolite clinoptilolite (Ca0.5,Na,K)6(Al6Si30)O72·20H2O) was applied. Furthermore, the NH4+ adsorption ability of zeolites with different loads was investigated. For Austria, a theoretical potential of 1134 t of NH4+ per year was determined, which is present in DSW. The potential of PO43- is lower and amounts to 7 t per year. With 20 g Na pretreated clinoptilolite, ammonium exchange capacity of up to 61 % could be achieved with a quantity of 500 mL DSW. The zeolite loaded with Na achieves the highest ammonium exchange capacities. For further tests with a pilot plant 3 samples can be used.
|Translated title of the contribution||Recovery of ammonium and phosphate from landfill leachate with ILS-Process|
|Award date||25 Oct 2019|
|Publication status||Published - 2019|