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Role of Layered Double Hydroxide in Improving the Stability of Aerobic Granular Sludge
Author(s) -
Sun Haoyuan,
Chen Shanping,
Liu Jianyong,
Qian Guangren,
Song Lijie
Publication year - 2017
Publication title -
clean – soil, air, water
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 66
eISSN - 1863-0669
pISSN - 1863-0650
DOI - 10.1002/clen.201500943
Subject(s) - extracellular polymeric substance , hydroxide , granulation , chemistry , metal hydroxide , sequencing batch reactor , activated sludge , chemical engineering , nuclear chemistry , chromatography , waste management , inorganic chemistry , materials science , bacteria , wastewater , biology , biofilm , engineering , composite material , genetics
Activated carbon (AC), layered double hydroxide (LDH), and metal ions (MIs) were added to aerobic sequencing batch reactors (SBRs), respectively, to improve the stability of aerobic granular sludge (AGS). The results showed that the addition of AC, LDH, and MIs accelerated the sludge granulation. With the addition of LDH, the AGS was denser and more compact, and the protein and polysaccharide contents of the extracellular polymeric substance (EPS) extracted from AGS were higher. In addition, the removal efficiencies of COD and NH 4 + ‐N in the reactor with LDH addition were higher than those with AC and MIs addition, respectively. These results indicate that the AGS cultivated with LDH addition was more stable and more efficient than those with the addition of AC and MIs. The stimulated EPS secretion, the bridging effect and the binding effect played important roles in improving the AGS stability.