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The role of external carbon sources at each stage of an A 2 /O process for simultaneously removing nitrogen and phosphorus
Author(s) -
Xie Jingyi,
Guo Yi,
Li Yongfeng
Publication year - 2018
Publication title -
environmental progress and sustainable energy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.495
H-Index - 66
eISSN - 1944-7450
pISSN - 1944-7442
DOI - 10.1002/ep.12885
Subject(s) - phosphorus , nitrogen , carbon fibers , effluent , chemistry , eutrophication , environmental chemistry , nitrate , wastewater , environmental engineering , environmental science , nutrient , materials science , organic chemistry , composite number , composite material
Eutrophication has increased globally which has resulted in a deterioration of water quality, largely due to an increase nitrogen and phosphorus from urban sewage. In this study, a novel A 2 /O process to simultaneously remove nitrogen and phosphorus from wastewater is presented which could overcome issues regarding insufficient carbon sources, and maximizing the use carbon sources. Moreover, the carbon source could not meet the required A 2 /O system, which aggravated the competition of carbon sources in the A 2 /O system. Methanol, glucose and ethanol were used as carbon sources with different ratios (3:0:0, 1:1:1, 0:2:1, 0:1:2, and 0:0:3) in the three chambers in the A 2 /O experiment. Results show that ethanol was the most efficient carbon source for removing nitrogen and phosphorus. Total nitrogen (TN) and total phosphorus (TP) removal rates were 78.23 and 78.18%, and the removal time ofNO 2 – – N was 25 min. A dosing ratio of 0:1:2 (external carbon source) and a nitrate recycling ratio of 250% were then optimum conditions for the A 2 /O system, the A 2 /O system efficiently removed TN and TP. The removal rates of TN, NH 3 –N, and TP were 82.36, 96.67, and 92.18%, respectively. The effluent concentrations were 11.43, 4.1, and 0.45 mg/L, respectively, which reached the requirements of the type A standard GB18918‐2002. © 2018 American Institute of Chemical Engineers Environ Prog, 37: 1901–1907, 2018