NDLI: Comparative Study on Advanced Nitrogen Removal of Landfill Leachate Treated by SBR and SBBR

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Comparative Study on Advanced Nitrogen Removal of Landfill Leachate Treated by SBR and SBBR

Content Provider	MDPI
Author	Jiang, Jinfeng Ma, Liang Hao, Lianjie Wu, Daoji Wang, Kai
Copyright Year	2021
Description	In order to achieve advanced nitrogen removal from landfill leachate without the addition of external carbon sources, a Sequencing Batch Reactor (SBR) and a Sequencing Biofilm Batch Reactor (SBBR) were proposed for the treatment of actual landfill leachate with ammonia nitrogen ( $NH4+$ -N) and chemical oxygen demand (COD) concentrations of 1000 ± 100 mg/L and 4000 ± 100 mg/L, respectively. The operating modes of both systems are anaerobic–aerobic–anoxic. After 110 days of start-up and biomass acclimation, the effluent COD and the total nitrogen (TN) of the two systems were 650 ± 50 mg/L and 20 ± 10 mg/L, respectively. The removal rates of COD and total nitrogen could reach around 85% and above 95%, respectively. Therefore, advanced nitrogen removal was implemented in landfill leachate without adding any carbon sources. After the two systems were acclimated, nitrogen removing cycles of SBR and SBBR were 24 h and 20 h, respectively. The nitrogen removing efficiency of SBBR was improved by 16.7% in comparison to SBR. In the typical cycle of the two groups of reactors, the nitrification time of the system was the same, which was 5.5 h, indicating that although the fiber filler occupied part of the reactor space, it had no significant impact on the nitrification performance of the system. At the end of aeration, the internal carbon source content of sludge of SBBR was equivalent to that of the SBR system. However, the total nitrogen concentration of SBBR was only 129 mg/L, which is 33.8% lower than that of SBR at 195 mg/L. The main reason was that biofilm enhanced the simultaneous nitrification and denitrification (SND) effect of the system.
Starting Page	3240
e-ISSN	20734441
DOI	10.3390/w13223240
Journal	Water
Issue Number	22
Volume Number	13
Language	English
Publisher	MDPI
Publisher Date	2021-11-16
Access Restriction	Open
Subject Keyword	Water Water Science and Technology Landfill Leachate Sbr Sbbr Advanced Nitrogen Removal Simultaneous Nitrification and Denitrification
Content Type	Text
Resource Type	Article

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