Poboljšanje učinkovitosti rada uređaja za obradu otpadne vode mljekarske industrije dodatkom bioaktivatora

The problem in the work of dairy wastewater treatment system of milk processing industry Dukat Dairy Industry Inc., Factory Sirela, which applies the technology of activated sludge are filamentous microorganisms that cause bulking of the activated sludge and consequent inefficient treatment of wastewater. Also, this activated sludge does not have good settling properties and separation from treated water. The factors which caused such poor sludge quality are: a sudden high organic load and changes in environmental factors. In order to improve the efficiency of the system, a role and contribution of bioactivator “Aquatop® BA” was studied. The operation of the system is monitored during the period January-May in the year 2006 (bioactivator not added) and in the year 2009 (with addition of bioactivator). By adding the bioactivator better formation of flocs and good settling of activated sludge, prevention of filamentous bacteria growth and stable quality of the effluent to the required values prescribed by the Croatian waters to the chemical oxygen demand (COD) <700 mg/L and biochemical oxygen demand (BOD) <250 mg/L were achieved.Problem u radu sustava za obradu otpadne vode mljekarske industrije Dukat mliječna industrija d.d., Tvornica Sirela, koji primjenjuje tehnologiju aktivnog mulja čine filamentozne vrste mikroorganizama koje izazivaju napuhavanje mulja, a posljedično tome neučinkovitu obradu otpadne vode. Također, takav mulj nema svojstva dobre taloživosti, odnosno odjeljivanja od pročišćene vode. Na takvo stanje utječe iznenadno veliko organsko opterećenje sustava i promjene okolišnih čimbenika. U svrhu poboljšanja rada sustava istražena je uloga i doprinos bioaktivatora “Aquatop® BA”. Rad sustava motren je tijekom razdoblja siječanj-svibanj 2006. godine (nije dodavan bioaktivator) i 2009. godine (dodavan bioaktivator). Dodatkom bioaktivatora postiže se bolje povezivanje mikroorganizama u nakupine, dobro taloženje aktivnog mulja, sprječavanje rasta filamentoznih bakterijai ustaljena kakvoća izlaznog toka prema zahtijevanim vrijednostima propisanim Vodopravnom dozvolom i to kemijska potrošnja kisika (KPK) <700 mg/L, biokemijska potrošnja kisika (BPK) <250 mg/L

Potencijal otpadne vode mljekarske industrije za proces denitrifikacije

In this work the potential of dairy wastewater for denitrification process by means of a microbial culture of nitrificants and denitrificants was investigated. The aim of this work was to remove nitrate by using organic compounds from the dairy wastewater as an electron donors. The minimal ratio of COD/NO3-N of 10 (COD-chemical oxygen demand/NO3-N-nitrate nitrogen) was required to achieve complete reduction of NO3-N. The microbial culture of nitrificants and denitrificants, that was previously adapted on the dairy wastewater, carried out nitrate reduction with a different substrate utilization rate. The denitrification rate of 5.75 mg NO3-N/Lh was achieved at the beginning of denitrification when the microbial culture utilizes readily biodegradable COD. Further degradation occurred with the denitrification rate of 1.7 mg NO3-N/Lh.U ovom radu istražen je potencijal otpadne vode mljekarske industrije za proces denitrifikacije pomoću mikrobne kulture nitrifikanata i denitrifikanata. Cilj rada je bio ukloniti nitrat koristeći organske sastojke iz otpadne vode industrije prerade mlijeka kao elektron donore. Minimalan omjer KPK/ NO3-N (KPK-kemijska potrošnja kisika/NO3-N-nitratni dušik) potreban za postizanje potpune redukcije NO3-N iznosi 10. Mikrobna kultura nitrifikanata i denitrifikanata, prethodno prilagođena na otpadnu vodu mljekarske industrije, provodi redukciju nitrata uz različitu brzinu iskorištenja supstrata. U početku denitrifikacije mikrobna kultura troši lako razgradivi KPK i postiže brzinu denitrifikacije od 5,75 mg NO3-N/Lh. Daljnja razgradnja zbiva se uz brzinu denitrifikacije od 1,7 mg NO3 N/Lh

Biorazgradnja otpadne vode iz procesa proizvodnje maslinova ulja s pomoću Trichosporon cutaneum i Geotrichum candidum

Olive oil production generates large volumes of wastewater. These wastewaters are characterised by high chemical oxygen demand (COD), high content of microbial growth-inhibiting compounds such as phenolic compounds and tannins, and dark colour. The aim of this study was to investigate biodegradation of olive mill wastewater (OMW) by yeasts Trichosporon cutaneum and Geotrichum candidum. The yeast Trichosporon cutaneum was used because it has a high potential to biodegrade phenolic compounds and a wide range of toxic compounds. The yeast Geotrichum candidum was used to see how successful it is in biodegrading compounds that give the dark colour to the wastewater. Under aerobic conditions, Trichosporon cutaneum removed 88 % of COD and 64 % of phenolic compounds, while the dark colour remained. Geotrichum candidum grown in static conditions reduced COD and colour further by 77 % and 47 %, respectively. This investigation has shown that Trichosporon cutaneum under aerobic conditions and Geotrichum candidum under facultative anaerobic conditions could be used successfully in a two-step biodegradation process. Further investigation of OMW treatment by selected yeasts should contribute to better understanding of biodegradation and decolourisation and should include ecotoxicological evaluation of the treated OMW.Tijekom proizvodnje maslinova ulja nastaju velike količine otpadne vode. Karakterizira je visoka kemijska potrošnja kisika (KPK), visoka koncentracija sastojaka koji inhibiraju rast mikroorganizama, poput fenolnih spojeva i tanina i tamna boja. Cilj ovog rada je bio istražiti biorazgradnju otpadne vode iz procesa proizvodnje maslinova ulja s pomoću kvasaca Trichosporon cutaneum i Geotrichum candidum. Kvasac Trichosporon cutaneum u ovom je istraživanju uporabljen zbog svog visokog potencijala za biorazgradnju fenolnih i drugih toksičnih spojeva. Kvasac Geotrichum candidum uporabljen je kako bi se istražilo koliko je uspješan u biorazgradnji spojeva koji otpadnoj vodi daju tamnu boju. Pri aerobnim uvjetima Trichosporon cutaneum uklonio je 88 % KPK i 64 % fenolnih spojeva, dok tamna boja otpadne vode preostaje. Geotrichum candidum u statičkim je uvjetima smanjio KPK i boju za 77 %, odnosno 47 %. Ovo je istraživanje pokazalo da Trichosporon cutaneum pri aerobnim uvjetima i Geotrichum candidum pri fakultativno anaerobnim uvjetima mogu biti uspješno uporabljeni u dvostupanjskom procesu biorazgradnje. Daljnje istraživanje obrade otpadne vode iz procesa proizvodnje maslinova ulja s pomoću odabranih kvasaca trebalo bi pridonijeti boljem razumijevanju biorazgradnje i uklanjanju boje i trebalo bi biti provedeno zajedno sa ekotoksikološkim vrednovanjem obrađene otpadne vode

Biological degradation of wastewater from sugar production industry

U ovom radu istražena je razgradnja otpadne vode iz procesa proizvodnje šećera. Anaerobna razgradnja otpadne vode šećerane je provedena diskontinuiranim i kontinuiranim pokusima pomoću anaerobnog mulja. Postignuto je 89-92% uklanjanje organskih sastojaka. Postupkom nitrifikacije sa predenitrifikacijom pomoću mikrobne kulture nitrifikanata i denitrifikanata razgradnjom anaerobno obrađene otpadne vode je postignuto 82-85% uklanjanje sastojaka s dušikom i 94% uklanjanje organskih sastojaka. U istraživanju denitrifikacijskog potencijala otpadne vode od pranja šećerne repe određen je minimalni omjer KPK/N = 8 za postizanje potpune redukcije nitrata. U SB reaktoru se primjenom mikrobne kulture nitrifikanata i denitrifikanata postiže potpuno uklanjanje organskih sastojaka i sastojaka s dušikom iz otpadnih voda od pranja šećerne repe i kondenzata.In this work the degradation of wastewater from sugar production industry was investigated. Anaerobic digestion of sugar industry wastewater was carried out in discontinuous and continuous experiments with anaerobic sludge. It was achieved 89-92% removal of organic compounds. By nitrification with predenitrification using microbial culture 82-85% removal of nitrogen and 94% removal of organic compounds from anaerobically treated sugar industry wastewater was achieved Denitrification potential of sugar beet wash wastewater was determined by a minimum ratio of COD/N = 8 for complete reduction of nitrate. In SB reactor by using microbial culture complete removal of the organic compounds and nitrogen from sugar beet wash wastewater and condensate was achieved

Biological degradation of wastewater from sugar production industry

U ovom radu istražena je razgradnja otpadne vode iz procesa proizvodnje šećera. Anaerobna razgradnja otpadne vode šećerane je provedena diskontinuiranim i kontinuiranim pokusima pomoću anaerobnog mulja. Postignuto je 89-92% uklanjanje organskih sastojaka. Postupkom nitrifikacije sa predenitrifikacijom pomoću mikrobne kulture nitrifikanata i denitrifikanata razgradnjom anaerobno obrađene otpadne vode je postignuto 82-85% uklanjanje sastojaka s dušikom i 94% uklanjanje organskih sastojaka. U istraživanju denitrifikacijskog potencijala otpadne vode od pranja šećerne repe određen je minimalni omjer KPK/N = 8 za postizanje potpune redukcije nitrata. U SB reaktoru se primjenom mikrobne kulture nitrifikanata i denitrifikanata postiže potpuno uklanjanje organskih sastojaka i sastojaka s dušikom iz otpadnih voda od pranja šećerne repe i kondenzata.In this work the degradation of wastewater from sugar production industry was investigated. Anaerobic digestion of sugar industry wastewater was carried out in discontinuous and continuous experiments with anaerobic sludge. It was achieved 89-92% removal of organic compounds. By nitrification with predenitrification using microbial culture 82-85% removal of nitrogen and 94% removal of organic compounds from anaerobically treated sugar industry wastewater was achieved Denitrification potential of sugar beet wash wastewater was determined by a minimum ratio of COD/N = 8 for complete reduction of nitrate. In SB reactor by using microbial culture complete removal of the organic compounds and nitrogen from sugar beet wash wastewater and condensate was achieved

The potential of dairy wastewater for denitrification

In this work the potential of dairy wastewater for denitrification process by means of a microbial culture of nitrificants and denitrificants was investigated. The aim of this work was to remove nitrate by using organic compounds from the dairy wastewater as an electron donors. The minimal ratio of COD/NO3-N of 10 (COD-chemical oxygen demand/NO3-N-nitrate nitrogen) was required to achieve complete reduction of NO3-N. The microbial culture of nitrificants and denitrificants, that was previously adapted on the dairy wastewater, carried out nitrate reduction with a different substrate utilization rate. The denitrification rate of 5.75 mg NO3-N/Lh was achieved at the beginning of denitrification when the microbial culture utilizes readily biodegradable COD. Further degradation occurred with the denitrification rate of 1.7 mg NO3-N/Lh