Open AccessStudy on rapid formation of aerobic granular sludge promoted by addition of Fe2+
Author(s) -
Ke Wang,
Xiaolei Zhang,
Wei Song,
Tao Song,
Li Ji
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2009/1/012047
Subject(s) - chemistry , activated sludge , particle size , sewage treatment , volume (thermodynamics) , wastewater , mixed liquor suspended solids , particle (ecology) , chemical engineering , pulp and paper industry , nuclear chemistry , environmental engineering , physics , environmental science , biology , ecology , quantum mechanics , engineering
The aerobic granular sludge (AGS) process has been regarded as a promising sewage treatment technology. Compared with the activated sludge process, AGS process has the advantages of high efficiency and saving space. However, AGS process has several limitations in its application such as long cultivation cycle and easy disintegration. In this study, Fe 2+ was added to the wastewater to cultivate AGS. The improvement on the cultivation of AGS with the addition of Fe 2+ was investigated by analyzing the characteristics of AGS and the removal efficiency of pollutants. The results showed that adding Fe 2+ (3~5 mg/L) to the reactor could effectively promote the formation of AGS. The sludge particles could be granulated within 7 days with the average particle size of more than 0.35 mm. In addition, the SEM showed that the dominant microorganisms were coryneform bacteria inside of the AGS. The XRD results indicates that the Fe 2+ was converted into Fe2O3 presenting in AGS. The mixed liquid suspended solids (MLSS) and the sludge volume index at 30 min (SVI30) was 3.1 g/L and 40 mL/g, respectively, at the 40th day. The COD and NH 4 + -N were effectively removed by AGS. This study could provide an effective approach for rapid formation of AGS.