Author/Editor		Šajn-Slak, A; Bulc, TG; Vrhovšek, D
Title		Comparison of nutrient cycling in a surface-flow constructed wetland and in a facultative pond treating secondary effluent
Type		članek
Source		Water Sci Technol
Vol. and No.		Letnik 51, št. 12
Publication year		2005
Volume		str. 291-8
Language		eng
Abstract		There is a growing interest in the possibilities offered by combinations of waste stabilisation ponds (WSP) and constructed wetlands (CW). The purpose of our study was to treatment performances and nutrient cycling in a surface-flow wetland (SFW) and in a WSP treating secondary effluent. In the period between 2000 and 2003, a pilot SFW and a pilot WSP were constructed at the outlet of the wastewater plant and their performance monitored while both were active under the same conditions. The SFW was planted with Phragmites australis and Eichhornia crassipes, while in the WSP development of algae was spontaneous. Performance efficiency was monitored by means of evaluation of physical and chemical parameters in water, by measurement of plant productivity and by analysis of N and P contents in biomass. The SFW with macrophytes proved more efficient in decreasing the suspended solids (64.6%), settleable solids (91.8%), organic N (59,3%), total N (38%), COD (67.2%) and BOD5 (72.1%) than the WSP. The WSP with algae was more efficient in treatment of ammonia nitrogen (48.9%) and ortho-phosphate (43.9%). The results of this study provide data that are of help in optimising combinations of SFW and WSP.
Descriptors		FRESH WATER WATER PURIFICATION PLANTS NITROGEN PHOSPHORUS BIOMASS ALGAE