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Removal of Cd,Ni,Zn from secondary treated municipal wastewater by constructed wetlands with halophytes

Fyntrilakis Konstantinos

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Year 2020
Type of Item Diploma Work
Bibliographic Citation Konstantinos Fyntrilakis, "Removal of Cd,Ni,Zn from secondary treated municipal wastewater by constructed wetlands with halophytes", Diploma Work, School of Environmental Engineering, Technical University of Crete, Chania, Greece, 2020
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The main aim of this thesis is to examine the removal of heavy metals Cd, Ni, Zn, from secondary wastewater treatment plants using constructed wetlands with halophytes.Constructed wetlands are an economical and effective solution for tertiary treatment, as they are based on renewable energy sources and are distinguished for their resistance to hydraulic and pollutant load fluctuations.Halophytes have the ability to grow naturally in an environment characterized by an abundance of toxic ions, including heavy metals, as they absorb salts from the environment of their roots and use them to increase the osmotic potential of their leaves from that of groundwater. The preference of using such plants was made because they showed promising results in similar experimental studies in the past. As a result, they are considered ideal for this strain as urban wastewater.For the implementation of this study, a constructed wetland of horizontal underground continuous flow and dimensions 1 x 0.5 x 0.5 m and operating volume 67.15 liters planted with Juncus acutus L. was placed in the Wastewater Treatment Plant of Chania. Experiments were performed to remove Cd, Ni, Zn from urban wastewater from secondary treatment. Samples were taken from the entrance and exit of the wetland, which were taken to the laboratory for measurements of the concentration of heavy metals under examination, as well as for pH, DO, ORP, EC, TDS with the aim of studying the effectiveness of the constructed wetland for the removal of heavy metals from secondary wastewater. Measurements were also performed for COD, BOD, TSS, total nitrogen and total phosphorus with the aim of studying the removal of the organic load.In order to carry out results, two phases of operation of the system lasting 65 and 30 days, respectively, took place. The results led us to the conclusion of a successful process of removing heavy metals through a constructed wetland as encouraging removal of heavy metals such as for zinc 51-60%, for cadmium 65-88% and for nickel 27% during the second operation. Positive removals were also recorded for TSS, total nitrogen and total phosphorus.

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