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Naša Ozonska Rješenja Optimiziraju Nadogradnju Metana
The presence of hydrogen sulfide (H2S) is an issue in many cases, especially in bioplin postrojenja industrije. In this paragraph, we focus in particular on two-stage biogas plants, where the anaerobic digester is separated from the methane upgrading unit. In this case, high concentrations of H2S are already formed in the digester, where ozone can be injected to reduce this issue.
Budući da se proces digestije odvija u anaerobnom, tj. okruženju bez kisika, ubrizgavanje ozona mora biti vrlo precizno i pažljivo izvedeno. Ozon se ubrizgava u zračnu komoru iznad mikrobnog sloja reakcije. Alternativno rješenje je dodavanje ozonacijske komore između anaerobne digestije i nadogradnje metana. Ovo drugo rješenje je sigurnije u pogledu održavanja anaerobnog okruženja, ali ima veće investicijske troškove.
Učinkovitost Ozoniranja u Zračnim Komorama Digestora
The air pocket above the reacting media offers quite a large volume for the ozone to react with the H2S. Therefore, the oxidation reaction with ozone is particularly effective. The H2S conversion for a reference case of ozonated digester is summarized in the figure.
H2S ozonation
As shown, ozone successfully treat H2S with conversions above 80 %. This means that ozone is capable of reducing the H2S concentration from 500 – 1000 ppm to 75 – 150 ppm already before the methane upgrading stage. Based on the incoming conditions and requirements, we offer a range of tailor-made solutions, optimizing the H2S removal and minimizing the energy consumption. H2S is converted into SO2, greatly reducing the odor and corrosion problems, according to the reaction shown.
Compared to other technologies, ozone offers several benefits for reducing H2S in digesters. For example, the use of iron chloride in the bio-bed has been the common practice for several years. However, this practice requires high operational costs, since the iron chloride is continuously consumed during the anaerobic digestion. In addition, there may be corrosion problems due to the high corrosion potential of iron chloride.
Ozoniranje ima znatno veću učinkovitost u usporedbi s ubrizgavanjem/tretiranjem konvencionalnim zrakom ili kisikom, zbog visokog oksidacijskog potencijala ozona. Ako se koristi zrak, konačna kvaliteta bioplina se pogoršava, jer se visoka koncentracija dušika ne može ukloniti u sljedećim procesnim koracima. Korištenje kisika izbjegava smanjenje kvalitete bioplina, ali je učinkovitost tretmana znatno niža u usporedbi s ozonom, jer reakcije oksidacije kisikom teku znatno sporije.To znači da tretman kisikom zahtijeva veće volumene i dulja vremena reakcije, dok ozon postiže učinkovitu obradu u kraćem vremenu i s manjim volumenima. Zbog toga je ozoniranje posebno prikladno za postrojenja s ograničenim prostorom.
