Učinkovitost evapotranspiracijskega sistema za zapiranje snovnih poti odpadne vode

Pavliha, Gaja (author), Istenič, Darja (mentor), Pintar, Marina (co-mentor)

Prevladujoči načini čiščenja odpadnih voda ne upoštevajo zapiranja snovnih tokov in vodnega kroga, odpadno vodo obravnavajo zgolj kot odpadek. Evapotranspiracijski sistem (ETS) je sistem brez emisijskih izpustov v okolje (angl. »zero-emission«), kjer se vsa odpadna in padavinska voda porabi za rast vrb in pri izhlapevanju v atmosfero. Pilotni ETS na območju Centralne čistilne naprave Ajdovščina je sestavljen iz 9 neprepustnih gred dolžine 3 in širine 1 m. V vsaki gredi so zasajene tri sadike istega klona bele vrbe. Porabo odpadne vode ter vpliv na rast vrb in produkcijo biomase smo raziskovali na treh klonih bele vrbe, in sicer na klonu avtohtone vrste Salix alba in dveh klonih hibridov S. alba L. × S. alba L. var. calva G.F.W. Mey ter (S. alba) in S. alba L. × S. alba var. vitellina (L.) Stokes v vegetacijskih sezonah v letih 2016 in 2017. Vrbe v ETS so imele večje število poganjkov, večjo višino ter debelino poganjkov v primerjavi s kontrolnimi drevesi, kar kaže na pozitiven vpliv odpadne vode na rast. S spremljanjem znižanja gladine vode v gredah smo opredelili porabo odpadne vode v ETS in izračunali potrebno površino sistema, ki znaša za štiričlansko družino v zmernem klimatskem pasu 144 m2. ETS imajo pomembno vlogo pri zniževanju onesnaženosti površinskih in podzemnih voda, s produkcijo biomase kot obnovljivega vira energije, vplivajo na razvoj gospodarstva.

• Language: Slovenian
• Keywords: Evapotranspiracijski sistem, učinkovitost, Salix, odpadna voda, zapiranje snovnih zank
• Work type: Master's thesis/paper
• Organization: BF - Biotechnical Faculty
• Year: 2020
• PID: 20.500.12556/RUL-113547
• COBISS.SI-ID: 5316943
• Publication date in RUL: 18.01.2020

Secondary language

• Language: English
• Title: Efficiency of the evapotranspirative system for closing the nutrient loop of wastewater treatment

Abstract

The prevailing methods of wastewater treatment do not take into account the closure of nutrient loops and water circuits, and wastewater is treated only as waste. Evapotranspirative system (ETS) is a system with closed nutrient loop and zero-emission, where all wastewater and rainwater is used for the growth of willow clones and evaporation into the atmosphere. Pilot ETS at Central Wastewater Treatment Plant Ajdovščina consists of nine beds, each 3 m long and 1 m wide; each bed is sealed with an impermeable membrane. Wastewater consumption and the impact on growth and biomass production were studied on three clones of white willow: autochthonous species Salix alba and hybrids S. alba L. × S. alba L. var. Calva GFW Mey, and (S. alba) and S. alba L. × S. alba var. vitellina (L.) Stokes. Wastewater was added in two vegetation periods, in the years 2016 and 2017. The positive effect of wastewater on clones is reflected in a larger number of shoots, higher growth, and thickness of the shoots compared to control plants. By monitoring the decrease in the water level in the beds we defined the wastewater consumption in the ETS and calculated the necessary area of the system, which is 144 m2 for a four-member household in a temperate climate zone. ETSs play an important role in reducing surface and groundwater pollution and with the production of biomass as a renewable energy source, also affecting economic development.

• Keywords: Evapotranspirative system, efficiency, Salix, wastewater treatment, closing the nutrient loop