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Start‐up strategy and bacterial community analysis of SNAD process for treating anaerobic digester liquor of swine wastewater (ADLSW) in a continuous‐flow biofilm reactor
Author(s) -
Xin Xin,
Liu Qin,
Werner David,
Lu Hang,
Qin Jiawei
Publication year - 2020
Publication title -
water and environment journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 37
eISSN - 1747-6593
pISSN - 1747-6585
DOI - 10.1111/wej.12568
Subject(s) - anammox , denitrifying bacteria , effluent , wastewater , bioreactor , chemistry , nitrification , pulp and paper industry , denitrification , ammonium , nitrite , sewage treatment , nitrate , environmental chemistry , microbiology and biotechnology , nitrogen , biology , environmental engineering , environmental science , organic chemistry , engineering
Abstract Simultaneous partial nitrification, anammox and denitrification (SNAD) process for treating anaerobic digester liquor of swine wastewater (ADLSW) was achieved successfully in a continuous ‐flow biofilm reactor by gradually increasing the influent ammonium ( NH 4 + - N ) concentration whilst controlling the low dissolved oxygen (DO) concentration. After 180 days of operation, the average removal efficiencies ofNH 4 + - N , total nitrogen (TN) and COD were 61.59, 55.76 and 75.21% respectively. Also, the average conversion efficiencyYNO 2 - + NO 3 -/ NH 4 +of total effluent nitrite and nitrate production to ammonia consumption was kept at about 0.053 at the last stage (days 181‐218). Anaerolineaceae (26.92%) , Candidatus Brocadia (3.96%), Candidatus‐Kuenenia (4.69%) , Armatimonadetes‐norank (4.25%), Limnobacter (4.15%), Xanthomonadaceae (3.07%) and Ignavibacterium (2.87%) were the dominant genera in the SNAD system for treating ADLSW. The quantitative polymerase chain reaction (qPCR) results further confirmed that the co‐existence and enrichment of anammox bacteria, ammonium oxidising bacteria (AOB) and denitrifying bacteria (HB) in the bioreactor.