Abstract：
:The mature landfill leachate containing high ammonia concentration (>1000 mg/L) is a serious threat to environment; however, the low COD to TN ratio (C/N, <3) strongly inhibits the denitrification process and poses a severe obstacle for efficient treatment. Herein, two kinds of acidogenic liquids, fermented from oil-removed food waste and oil-added food waste, were first applied as external carbon sources for the biological nitrogen removal from mature landfill leachate in an aerobic/anoxic membrane bioreactor. "Acidogenic liquid b" served quite better than commercial sodium acetate, considering the higher denitrification efficiency and the slightly rapider denitrification rate. The effect of C/N and temperature were investigated under hydraulic retention time (HRT) of 7 d, which showed that C/N ≥ 7 (25 °C) was enough to meet the general discharge standards of NH4+-N, TN and COD in China. Even for some special areas of China, the more stringent discharge standards (NH4+-N ≤ 8 mg/L, TN ≤ 20 mg/L) could also be achieved under longer HRT of 14 d and C/N ≥ 6. Notably, the COD concentration in effluent could also be well reduced to 50-55 mg/L, without further physical-chemical treatment. This proposed strategy, involving the high-value utilization of food waste, is thus promising for efficient nitrogen removal from mature landfill leachate.
journal_name
J Environ Managejournal_title
Journal of environmental managementauthors
Yan F,Jiang J,Zhang H,Liu N,Zou Qdoi
10.1016/j.jenvman.2018.03.003subject
Has Abstractpub_date
2018-05-15 00:00:00pages
184-191eissn
0301-4797issn
1095-8630pii
S0301-4797(18)30220-2journal_volume
214pub_type
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