Povečanje proizvodnje bioplina z anaerobno razgradnjo sirotke

Jurjevec, Maja (author), Marinšek Logar, Romana (mentor), Zupančič, Gregor D. (comentor)

V raziskavi smo preverjali, če je možno z anaerobno razgradnjo surovega blata z dodatkom sirotke z laktozo proizvesti več bioplina kot iz samega surovega blata. Surovo blato je mešanica primarnega in sekundarnega blata vzetega iz čistilne naprave Domžale - Kamnik. Želeli smo ugotoviti način doziranja in maksimalno količino dodane sirotke z laktozo v anaerobne bioreaktorje, da ostane proces stabilen in brez negativnega vpliva na strojno zgoščanje. Preverili smo tudi ali se ob povečani proizvodnji bioplina na račun sirotke z laktozo tudi poveča delež metana v bioplinu. Raziskavo smo izvedli z dvema pilotnima bioreaktorjema, katerih volumen je 197 L. Ugotovili smo, da je anaerobna razgradnja sirotke z laktozo potekala stabilno in brez večjih težav. V eksperimentalnem reaktorju se je povečala proizvodnja bioplina, in sicer v prvih petih obdobjih dodajanja po 1 L sirotke na dan za 172 % in v naslednjih petih obdobjih dodajanja po 2 L sirotke na dan za 200 %. S povečano proizvodnjo bioplina v eksperimentalnem reaktorju se ni povečal delež metana v bioplinu, ampak je ta celo upadel. Ob dodajanju 1 L sirotke na dan je delež metana v bioplinu upadel za 2 % in ob dodajanju 2 L sirotke na dan za 11 %. Bioplinska produktivnost je tako znašala v eksperimentalnem reaktorju ob dodajanju 1 L sirotke na dan 19 m3/m3/dan in ob dodajanju 2 L sirotke na dan 21 m3/m3/dan, medtem ko je v kontrolnem reaktorju znašala 14 m3/m3/dan. Rezultati so pokazali, da je bil na račun dodane sirotke izplen bioplina večji v eksperimentalnem reaktorju. Ugotovili smo, da se količina suhe snovi in delež organske snovi ne razlikujeta med bioreaktorjema in da sirotka nima vpliva na učinkovitost centrifugiranja dehidriranega blata.

• Language: Slovenian
• Keywords: odpadne vode, bioplin, bioplinski reaktorji, sirotka, čistilne naprave, dehidrirano blato, surovo blato, anaerobna razgradnja
• Work type: Master's thesis/paper
• Organization: BF - Biotechnical Faculty
• Year: 2018
• PID: 20.500.12556/RUL-105840
• COBISS.SI-ID: 4964431
• Publication date in RUL: 20.12.2018

Secondary language

• Language: Unknown
• Title: Increasing the production of biogas through the anaerobic digestion of cheese whey

Abstract

In the study, we examined if anaerobic degradation of raw sludge (RS) with addition of whey produces more biogas then anaerobic degradation of RS. The RS is a mixture of primary and secondary sludge taken from a wastewater treatment plant Domžale -¬ Kamnik. We wanted to find out the method of dosing and the maximum amount of added whey to the anaerobic bioreactors to keep the process stable and without adversely affecting machine densification. We checked whether the increased biogas production at the expense of whey increases the proportion of methane present in biogas. The study was carried out with two pilot bioreactors, the volume of which was 197 L. We found that anaerobic decomposition of the whey was stable. In the experimental reactor (R2), the production of biogas increased in the first five periods of adding 1 L/day of whey by 172 % and in the next five periods of adding 2 L/day of whey by 200 %. With the increased production of biogas in the R2, the proportion of methane in biogas did not increase, but it even declined. When adding 1 L/day of whey, the methane content decreased by 2 % and added 2 L/day of whey it decreased by 11 %. Biogas productivity was thus found to be in the R2 while adding 1 L/day of whey 19 m3/m3/day and adding 2 L/day of whey 21 m3/m3/day while 14 m3/m3/day was produced in the control reactor. The results showed that the extraction of the biogas was higher in the R2 where we used whey. It has been found that the amount of dry matter and the proportion of organic matter does not differ between bioreactors and that whey has no influence on the efficiency of centrifugation of dehydrated sludge.

• Keywords: Wastewater, biogas, biogas reactors, whey, wastewater treatment plant, dehydrated sludge, sewage sludge, anaerobic digestion