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Behaviors of Intercellular Materials and Nutrients in Biological Nutrient Removal Process Supplied with Domestic Wastewater and Food Waste
Author(s) -
Chae SoRyong,
Jeong HyeongSeok,
Lim JaeLim,
Kang SeokTae,
Shin HangSik,
Paik ByeongCheon,
Youn JongHo
Publication year - 2004
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143004x141834
Subject(s) - enhanced biological phosphorus removal , nitrification , chemistry , wastewater , phosphorus , nutrient , sequencing batch reactor , chemical oxygen demand , sewage treatment , polyhydroxyalkanoates , food science , denitrification , pulp and paper industry , nitrogen , environmental chemistry , activated sludge , environmental engineering , organic chemistry , biology , bacteria , environmental science , engineering , genetics
A four‐stage biological nutrient removal (BNR) process was operated to investigate the effectof anaerobically fermented leachate of food waste (AFLFW) as an external carbon source on nutrient removal from domestic wastewater having a low carbon‐to‐nitrogen ratio. The BNR system that was supplemented with AFLFW showed a good performance at a sludge retention time (SRT) of 30 days, despite low temperature. With this wastewater, average removal efficiencies of soluble chemical oxygen demand (COD), total nitrogen (T‐N), and total phosphorus (T‐P) were 88 to 93%, 70 to 74%, and 63 to 68%, respectively. In this study, several kinds of poly‐hydroxyalkanoates (PHAs) were observed in cells. These included 24% poly‐3‐hydroxybutyrate (PHB), 41% poly‐3‐hydroxyvalerate (PHV), 18% poly‐3‐hydroxyhexanoate (PHH), 10% poly‐3‐hydroxyoctanoate (PHO), 5% poly‐3‐hydroxyde‐canoate (PHD), and 2% poly‐3‐hydroxydodecanoate (PHDD), indicating that microorganisms could store various PHAs through the different metabolic pathways. However, breakdown of the enhanced biological phosphorus removal (EBPR) mechanism was observed when SRT increased from 30 to 50 days for the enhancement of nitrification. To study the effect of SRT on EBPR, a sequencing batch reactor (SBR) system that was supplied with glucose was operated at various SRTs of 5, 10, and 15 days. Nitrification and denitrification efficiencies increased as SRT increased. However, the content of intracellular materials such as PHAs, glycogen, and poly‐P in cells decreased. From these results, it was concluded that SRT should be carefully controlled to increase nitrification activity and to maintain biological phosphorus removal activity in the BNR process.