Search

Browse

• Communities
• Authors
• Year
• Titles
• Subjects

My Space

• Login

Investigation of pilot aerated constructed wetlands with different substrates treating municipal wastewater

Paragioudakis Konstantinos

Full record

---

Summary

Constructed wetland, is a developing technology for wastewater management. This diploma thesis investigates the application of artificial aeration in vertical flow-constructed wetlands with different substrates as a way of improving this technology, for wastewater management. For the investigation, three pilot vertical flow constructed wetlands were used, to which artificial aeration was applied and placed on an area of the Technical University of Crete. As the base for each wetland, a barrel made of polyethylene was used. The used substrates were pieces of recycled high-density polyethylene and gravel. The two out of the three wetlands were planted with the species of plant which is called Phragmites australis, which is also known as 'common reed' and the other was used as control. The polyethylene barrel was named P, the barrel that contained the gravel was named G, and the polyethylene barrel used as control barrel, was named C. One aerator for each constructed wetland was used for the aeration of the wetlands. Different hydraulic loads were used while monitoring the units, whereas the wastewater was added to each constructed wetland every second day. The municipal wastewater used was primary effluent from the wastewater treatment plant of the municipality of Chania. One day after the wastewater application and at the same time, the effluent from each wetland was measured. Every eight to ten days, a sample was collected from the primary effluent that was applied and from the effluent from each wetland. Οn the samples, analyses of BOD, COD, TOC, TSS, TN, 〖NΗ〗_4^+-N, NO_3^--N, TP, PO_4^(3-)-P, pH and EC took place, in the laboratory of environmental engineering and management of the School of Chemical and Environmental Engineering of Technical University of Crete. Measurements of the plant biomass of each wetland took place and samples from the leaves, the stems, and the roots were collected and on these samples analyses of total nitrogen, total phosphorus, and metals occurred. The results of this study present the concentration values of the effluent of each wetland, the values of the removals from each wetland, and the values of the measurements and the analyses of the biomass of the plants. From the sample analyses the BOD removal was 94,8±4,0% of P, 85,6±13,2% of G, and 69,2±13,2% of C, the COD removal was 91,0±5,6% at P, 84,2±16,0% at G and 74,9±13,5% at C, the TOC removal was 69,5±13,0% of P, 57,3±21,6% of G and 56,2±25,1% of C, the TSS removal was 83,4±16,0% of P, 86,0±11,2% of G and 63,6±18,9% of C, the TN removal was 84,0±10,6% at P, % at 67,3±17,4G, and 33,9±20,4% at C, the 〖NΗ〗_4^+-N removal was 96,1±9,0% at P, 79,5% at G, and 63,9±19,0% at C, the TP removal was 57,1±26,5% at P, 39,7±21,9% at G, and 24,1±25,5% at C and the PO_4^(3-)-P removal was 60,1±25,4% at P, 44,6±16,6% at G, and 21,7±12,8% at C. As this diploma thesis shows the results are satisfying compared to similar investigations.

Available Files

Services