Evaluation of two start-up strategies to obtain nitrogen removal via nitrite and examination of the nitrous oxide emissions for different nitritation levels during the treatment of slaughterhouse wastewater

BACKGROUND This study investigated the use of a novel start-up strategy to obtain nitrogen removal via nitrite using real-time aeration control, in a sequencing batch reactor (SBR1), for the treatment of slaughterhouse wastewater. In addition, another SBR (SBR2) was operated with the same objective, but with a start-up from seed sludge. Furthermore, analysis of the nitrous oxide (N2O) production and emission was conducted for different levels of nitritation degree (ND). RESULTS Through the absence of inoculum in SBR1, the nitrifying population could be regulated from the beginning and prevented nitrite oxidising bacteria to occur. This was proved by the ND, which was already above 80% from day 28. Although, it lasted 59 days to achieve a sufficient nitrogen removal efficiency (> 80%). In contrast for SBR2, it took 90-110 days to achieve full nitritation, however the nitrogen removal efficiency was above 90% at all time. The maximum N2O emission resulted in 0.12% of the nitrogen load. CONCLUSION This study suggested the importance of the seeding sludge for the achievement of full nitritation. Moreover, a strong positive relationship between the ND and N2O emission was observed.

Jaar van publicatie:2018

Trefwoorden:A1 Journal article

BOF-keylabel:ja

BOF-publication weight:1

CSS-citation score:1

Authors from:Higher Education

Toegankelijkheid:Open