Etilspirta kā papildus oglekļa avota ietekme uz denitrifikāciju un sērūdeņraža veidošanos notekūdeņu attīrīšanas anaerobajā stadijā
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Latvijas Universitāte
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Abstract
Darbā pētīta etilspirta kā papildus oglekļa avota ietekme uz denitrifikāciju un sulfātu redukciju farmaceitisko notekūdeņu denitrifikācijas etapā. Eksperimenti veikti četros variantos – trijos tika pievienots dažādas koncentrācijas etilspirts, bet ceturtajā netika pievienots. Atkarībā no kopējā slāpekļa sākotnējās koncentrācijas notekūdeņu paraugā tika pievienots 0,004-0,0034 % etilspirta. Slāpekļa savienojumu redukcija notika proporcionāli pievienotajam etilspirta daudzumam. Anaerobā vidē slāpekļa redukcija notika tikai uz nitrātu rēķina, bet zemā izšķīdušā skābekļa vidē vienlaicīgi notika nitrifikācija un denitrifikācija.
Darbs izstrādāts A/S „Grindeks” notekūdeņu attīrīšanas iecirknī.
Atslēgas vārdi: denitrifikācija, oglekļa avots, notekūdens, anaerobā nitrātu redukcija, etilspirts.
Theme of work - Effectiveness of ethanol as additional carbon source on the denitrification and hydrogen sulphide formation at the anaerobic wastewater treatment stage. In this work, influence of ethanol as additional carbon source on denitrification and sulphate reduction at wastewater denitrification stage was investigated. Experiments were performed in four variants – in three variants different concentration of ethanol was added, but fourth variant was without ethanol. Depending on nitrogen concentration in wastewater, ethanol was added in final concentration 0.004-0.0034 %. Reduction of nitrogen concentration was in proportion with added ethanol amount. In anaerobic conditions nitrogen reduction occurred only by reduction of nitrate, but in low dissolved oxygen conditions, nitrification and denitrification occurred simultaneously. Work was developed in JSC „Grindeks” wastewater treatment plant. Keywords: denitrification, carbon source, wastewater, anaerobic sulphate reduction, ethanol.
Theme of work - Effectiveness of ethanol as additional carbon source on the denitrification and hydrogen sulphide formation at the anaerobic wastewater treatment stage. In this work, influence of ethanol as additional carbon source on denitrification and sulphate reduction at wastewater denitrification stage was investigated. Experiments were performed in four variants – in three variants different concentration of ethanol was added, but fourth variant was without ethanol. Depending on nitrogen concentration in wastewater, ethanol was added in final concentration 0.004-0.0034 %. Reduction of nitrogen concentration was in proportion with added ethanol amount. In anaerobic conditions nitrogen reduction occurred only by reduction of nitrate, but in low dissolved oxygen conditions, nitrification and denitrification occurred simultaneously. Work was developed in JSC „Grindeks” wastewater treatment plant. Keywords: denitrification, carbon source, wastewater, anaerobic sulphate reduction, ethanol.