Biological Removal of Ammonia from Municipal Landfill Leachate (Kozodrza, Poland) at Limited Oxygen Access and Presence of Kaldnes Media

Abstract

The effect of filling the sequential batch reactor (SBR) with Kaldnes biomass carrier media on the effectiveness of landfill leachate treatment was examined. The experiment was carried out under limited access to oxygen (0.5-1.0 mg·L -1 ). The raw leachate was characterized with the COD concentration at the level of 7758 mg·L -1 , BOD 5 -904 mg·L -1 , and NH 4 + -980 mg·L -1 . The nitrogen loading rate (NLR) was low and amounted to 0.3 kg·m -3 ·d -1 . The fill fraction had no effect on the concentration of contaminants in effluents, but turned out to be significant as far as the ammonia nitrogen loss rate was concerned. During the first six hours of SBR operation, the reaction rate increased from 0.64 mg·L -1 ·h -1 to 6.85 mg·L -1 ·h -1 with increasing fill fraction. In the remaining time (7-23 h) in the case of the reactor operating only with suspended activated sludge, and the one with 10% of filtration media, the reaction rate was comparable, i.e. 27.24 mg·L -1 ·h -1 and 27.02 mg·L -1 ·h -1 , respectively. Increasing the fill fraction to 20% resulted in a decrease of the reaction rate to 18.28 mg· L -1 ·h -1 .

Combination of ozone-based advanced oxidation process and nanobubbles generation toward textile wastewater recovery

“…In the recent decade, different studies have formulated that the characteristic outcome of ozone-based AOP method is influenced by the chemical and physical parameters, such as pH of the solution (Deng and Zhao, 2015;Boczkaj and Fernandes, 2017;Koc-Jurczyk and Jurczyk, 2019). There is an ongoing discussion that pH is an essential parameter since it plays an important role during O 3 decomposition process (Temesgen et al, 2017).…”