Effect of initial NH4-N, NO3-N, and NO2-N concentrations on nitrification and denitrification processes

master's thesis

• Title: Učinak početne koncentracije NH4-N, NO3-N i NO2-N na brzinu nitrifikacije i denitrifikacije
• Author: Borna Smojver
• Mentor: Tibela Landeka Dragičević (mentor)
• Granter: University of Zagreb; Faculty of Food Technology and Biotechnology; (Department of Food Engineering); (Laboratory for the Biological Waste Water Treatment); Zagreb
• Defense date and country: 2013-09-27, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Biotechnology

Abstract

U ovom radu istražen je učinak biološkog uklanjanja dušika pri različitom opterećenju otpadne vode sa NH4-N, uz različite početne koncentracije NO3-N i NO2-N te uz dodatak NaAc za omjer C/NO2-N+NO3-N=2,2±0,4. Svaki pokus sastojao se procesa denitrifikacije pa nitrifikacije. Aktivni mulj provodi proces nitrifikacije u aerobnim uvjetima i proces denitrifikacije u anoksičnim uvjetima. Koncentracija NH4-N u pokusima je bila 16, 32, 48 i 83 mg NH4-N/L. S povećanjem početne koncentracije NH4-N nitrifikacija je trajala dulje vrijeme. Izvor ugljika u obliku natrijeva acetata u omjeru C/NO2-N+NO3-N 2,2±0,4 je bio dovoljan za potpunu denitrifikaciju. Suma NO2-N+NO3-N bila je u rasponu od 31,2 – 51,9 mg NO3-N+NO2-N/L. Specifične brzine nitrifikacije i denitrifikacije bile su: 11,67 mg NH4-N/gMLSSh i 35,67 mg NO3-N+NO2-N/gMLSSh (NH4-N=16 mg/L); 12,08 mg NH4-N/gMLSSh i 25,58 mg NO3-N+NO2-N/gMLSSh (NH4-N=32 mg/L); 9,24 mg NH4-N/gMLSSh i 10,8 mg NO3-N+NO2-N/gMLSSh (NH4-N=48 mg/L); 9,97 mg NH4-N/gMLSSh i 37,25 mg NO3-N+NO2-N/gMLSSh (NH4-N=83 mg/L).

Abstract (english)

The effect of biological nitrogen removal at different wastewater load with NH4-N, and different initial concentrations of NO3-N and NO2-N, and with the addition of NaAc at ratio C/NO2-N+NO3-N=2.2±0.4 was investigated. Each experiment consisted of nitrification and denitrification processes. Activated sludge process is carried out under aerobic conditions for nitrification and denitrification processes in anoxic conditions. Concentrations of NH4-N in the experiments were 16, 32, 48 and 83 mg NH4-N/L. With increasing initial concentrations of NH4-N nitrification lasted a long time. Source of carbon in the form of sodium acetate in the ratio C/NO2-N + NO3-N 2.2 ± 0.4 was sufficient for complete denitrification. The sum of NO2-N + NO3-N ranged from 31.2 to 51.9 mg NO3-N + NO2-N/L. Specific rate of nitrification and denitrification were: 11.67 mg NH4-N/gMLSSh and 35.67 mg NO3-N+NO2-N/gMLSSh (NH4-N=16 mg/L); 12.08 mg NH4-N/gMLSSh and 25.58 mg NO3-N+NO2-N/gMLSSh (NH4-N=32 mg/L); 9.24 mg NH4-N/gMLSSh and 10.8 mg NO3-N+NO2-N/gMLSSh (NH4-N=48 mg/L); 9.97 mg NH4-N/MLSSgh and 37.25 mg NO3-N+NO2-N/gMLSSh (NH4-N=83 mg/L).

• Keywords: denitrifikacija; nitrifikacija
• Keywords (english): denitrification; nitrification
• Language: croatian
• URN:NBN: urn:nbn:hr:159:590786
• Study programme: Title: Bioprocesno inženjerstvo; Study programme type: sveučilišni; Study level: diplomski; Academic / professional title: magistar/magistra inženjer/inženjerka bioprocesnog inženjerstva (magistar/magistra inženjer/inženjerka bioprocesnog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Restricted access
• Created on: 2017-05-04 10:19:30