Journal
ENVIRONMENTAL TECHNOLOGY & INNOVATION
Volume 21, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.eti.2020.101273
Keywords
Down-flow hanging media reactor; Hydraulic loading rate; Sponge; Nitrification; Denitrification
Funding
- Vietnam National University Ho Chi Minh City (VNU-HCM) [C2020-24-02]
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The study showed that the COD and TSS removal rates of the DHS reactor varied under different hydraulic loading rates, with NH4+-N removal rate reaching 80% and showing mild sensitivity to HLR changes. This proposed technology brings economic benefits by reducing energy consumption and can provide a feasible treatment solution for low-income areas.
The hydraulic loading rate (HLR) is a vital factor affecting the biological attached growth processes. Herein, a pilot-scale down-flow hanging sponge reactor (DHS) with a capacity of 0.5 m(3)/d was investigated under different HLRs (5.56 and 11.12 m(3)/m(2).d). The DHS reactor was operated at an organic loading rate of 1.2 kgCOD/m(sponge)(3).d. The results showed that COD removal attained 60.4 +/- 11.4% at HRL of 5.56 m(3)/m(2) d while this removal increased to 78% during the steady stage of operating at HLR of 11.12 m(3)/m(2).d. Total suspended solid (TSS) was moderately removed with the efficiencies of 69.7%-75.6%. High NH4+-N removal of 80% was attained during operation, indicated that the nitrification process was mildly sensitive to change of HLR. This proposed technology brings a beneficial economic in decreasing energy consumption. This study suggested a viable treatment solution of the DHS using natural air ventilation, which favors low-income areas. (C) 2020 Elsevier B.V. All rights reserved.
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