Influence of hydraulic loading rate on performance and energy-efficient of a pilot-scale down-flow hanging sponge reactor treating domestic wastewater

Environmental Technology & Innovation, Volume 21, February 2021, 101273 (SCIE, Q1, IF 7.758)

Authors: Van-Tung Tra, Bao-Trong Dang, Quach An Binh, Quy-Hao Nguyen, Phuong-Thao Nguyen, Hong-Hai Nguyen, Thanh-Tin Nguyen, Thanh-Hai Le, Duc-Trung Le, Tomoaki Itayama. Xuan-Thanh Bui

Research Article: Influence of hydraulic loading rate on performance and energy-efficient of a pilot-scale down-flow hanging sponge reactor treating domestic wastewater

Environmental Technology & Innovation, Volume 21, February 2021, 101273 (SCIE, Q1, IF 7.758)

Authors: Van-Tung Tra, Bao-Trong Dang, Quach An Binh, Quy-Hao Nguyen, Phuong-Thao Nguyen, Hong-Hai Nguyen, Thanh-Tin Nguyen, Thanh-Hai Le, Duc-Trung Le, Tomoaki Itayama. Xuan-Thanh Bui

Highlights

• Pilot-scale down-flow hanging sponge reactor could operate stably at 11.12 m3/m2 d.
• COD removal successfully achieved up to 78% at the steady operation.
• Nitrification reached 88.4% and 80.7% for with and without internal recirculation.
• Low COD/N ratios of 2.6–4.0 in the feed wastewater affected denitrification.
• Specific energy consumption was as low as 0.068 kWh/m3.

Abstract

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 m3/d was investigated under different HLRs (5.56 and 11.12 m3/m2.d). The DHS reactor was operated at an organic loading rate of 1.2 kgCOD/m.d. The results showed that COD removal attained 60.4 ± 11.4% at HRL of 5.56 m3/m2 d while this removal increased to 78% during the steady stage of operating at HLR of 11.12 m3/m2.d. Total suspended solid (TSS) was moderately removed with the efficiencies of 69.7%–75.6%. High NH-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.

Keywords: Down-flow hanging media reactor, Hydraulic loading rate, Sponge, Nitrification, Denitrification

Thông tin chi tiết vui lòng đọc thêm tại:

Van-Tung Tra, Bao-Trong Dang, Quach An Binh, Quy-Hao Nguyen, Phuong-Thao Nguyen, Hong-Hai Nguyen, Thanh-Tin Nguyen, Thanh-Hai Le, Duc-Trung Le, Tomoaki Itayama, Xuan-Thanh Bui, Influence of hydraulic loading rate on performance and energy-efficient of a pilot-scale down-flow hanging sponge reactor treating domestic wastewater, Environmental Technology & Innovation, Volume 21, 2021,101273, https://doi.org/10.1016/j.eti.2020.101273.
(https://www.sciencedirect.com/science/article/pii/S235218642031573X)