Open AccessPerformance of anaerobic denitrifying upflow anaerobic sludge bed bioreactor (AD-UASB)
Author(s) -
Jundan Wang,
Junyuan Ji
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/508/1/012157
Subject(s) - denitrifying bacteria , effluent , denitrification , anaerobic exercise , wastewater , chemistry , nitrate , bioreactor , pulp and paper industry , nitrogen , sewage treatment , environmental chemistry , environmental engineering , environmental science , biology , physiology , organic chemistry , engineering
Nitrate-containing wastewater has a severely negative impact on the ecological environment, and anaerobic denitrification process is promising biotechnology for nitrate-containing wastewater treatment. The nitrogen removal performance of anaerobic denitrifying upflow anaerobic sludge bedbioreactor (AD-UASB) and granular sludge characteristics were investigated. The results showed the maximum nitrogen removal loading rate (NRR) was reached up to 28.6 kg/(m 3 ·d) as nitrogen loading rate (NLR) was 28.8 kg/(m 3 ·d). At the same time, the effluent NO 3 − -N concentration and total nitrogen removal efficiency of AD-UASB was 5.09 mg/L and 99.51%, and the effluent NO 2 − -N concentration was as low as 10.97mg/L without obvious accumulation. As NLR was elevated to 36 kg/(m 3 ·d), the effluent NO 3 − -N and NO 2 − -N concentration were sharply increased to 199.62mg/L and 453.13mg/L, respectively, Thus, the denitrifying metabolic pathway was strongly suppressed which further led to the accumulation of NO 2 − -N concentration and the collapse of AD-UASB performance. The granular sludge was broken up and washed out from the reactor, and meanwhile, the concentration of MLSS and MLVSS were declined to 55.09g/L and 24.7g/L, respectively. The research can provide a beneficial reference for the anaerobic denitrification biotechnology application in nitrate-containing wastewater treatment.