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Βελτιστοποίηση σχεδιασμού τεχνητών υγροβιότοπων κατακόρυφης ροής για την επεξεργασία αστικών υγρών αποβλήτων με χρήση πιλοτικών μονάδων

Piperidis Loizos

Full record

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Summary

The purpose of this research was to further study the experimental parameters and better the technology of the Vertical Flow Artificial Wetlands, so as to apply the findings at the municipal wastewater processing. In the experiment, three units were used which were placed outside the greenhouse of the School of Chemical and Environmental Engineering at the Technical University of Crete. The first unit G (gravel) contained gravel as a filler material and the common reed Phragmite Australis for the processing. The second unit P (plastic) contained recycled plastic HDPE as the filler material; this was processed with reed as well. Liquid waste was used as input to the units from the D.E.Y.A. of Chania, which was collected after the primary processing. The units were enriched with the sewage with 8 litres per unit every two days. The volume of the units was 88 L for C (control), and 63L for both G (gravel) and P (plastic). In continuation, analyses were made for inputs and outputs of units to determine the following parameters: BOD5, COD, TSS, TN, NH4-N, NO3-N, TP, PO4 3 -P, TOC, electrical conductivity EC and pH. Through the results of the analyses, the following removal efficiencies were obtained for the units G, P and C. For B0D5 the performance in the unit G is 71,75±8,97%, in the unit P, 80,1±5,99%, and in the unit C, 55,76±18,43%. The performance found in unit G for COD is at 70,06±12,08%, P has 78,91±6,24% and C at 56,68±16,31%. For TSS the performance found in the unit G is at 87,5±10,08%, in unit P 84,4±15,83% and in unit C 82,1±8,66%. Subsequently for TN the unit G has a performance of 52,09±15,35%, the unit P at 62,09±12,28% and C at 18,3±17,80. Also, for NH1-N the unit G is at 63,27±20,25%, P at 71,71±13,19% and C at 24,24±20,32%. It was found for the unit G for TP 49,17±23,69%, for unit P at 41,32±15,55% and for unit C 41,25±17,34%. Respectively the performance for PO4 P is for the unit G at 35,73±16,86%, for the unit P at 21,78±13,83% and for the unit C 21,84±17,60%. Likewise for TOC, unit G has 50,43±26,31% performance, unit P has 56,10±20,94% and unit C 56,34±19,02%. Regarding NO3-N, prices were very low to negligible levels. Also, the PH level fluctuates almost at the same levels as that of the input, unit P and C are slightly alkaline whereas unit G is nearly neutral. Lastly, the electrical conductivity also presents almost the same results as those of the input, with unit G being at slightly higher levels. In conclusion, it appears that the use of recycled plastic (high density polyethylene HDPE) as a substrate, is suitable for the elements above.

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