Nitrogen and phosphorus removal in an anaerobic (UASB)-aerobic (ABF) sewage treatment system

Abstract

A B S T R A C TAnaerobic sewage treatment process using upflow anaerobic sludge blanket (UASB) coupled with aerated biofilter (ABF) was tested for the removal of nitrogen and phosphorus by recycling the final effluent and by adding alum to the influent. TCOD Removal efficiency was about 60% in UASB without recycling of the ABF effluent, while it increased to 90% at recycling ratio of 3. Complete denitrification had occurred in the UASB, and removal efficiencies of both total nitrogen (TN) and NH þ 4 -N were also improved to 74 and 96%, respectively, by recycling the nitrified ABF effluent. Total phosphorus (TP) removal was not improved by recycling of the ABF effluent. TP and soluble phosphorus were effectively removed in UASB by adding alum to the influent. 90% removal of TP was possible with alum dose at Al/P mole ratio of 2.6. In the final effluent, concentrations of TCOD, TN, and TP were below 14.0, 7.0, and 0.27 mg/L, respectively, in the UASB-ABF sewage treatment system at recycling ratio of 3 with alum.

An integrated pilot scale UASB and aerotank system for the treatment of rice paper production wastewater: A case study from Phu Hoa Dong, Ho Chi Minh City, Vietnam

“…The inadequate MLVSS/MLSS ratio in the UASB tank (0.47-0.51) signi es a metabolic activity de ciency among the anaerobic microorganisms, leading to less removal of TN and TP from the rice paper production facility wastewater. In a previous work, the primary mechanism by which TN and TP are eliminated from wastewater was reported to be via the organic nitrogen and insoluble phosphorus mineral particle settlement process within an UASB [35]. In their study, Tian et al [35] discovered that organic nitrogen, organic phosphorus, and COD particulates were effectively separated/removed (> 90%) by anaerobic bacteria in an UASB via bio occulation and the production of EPS.…”

“…In a previous work, the primary mechanism by which TN and TP are eliminated from wastewater was reported to be via the organic nitrogen and insoluble phosphorus mineral particle settlement process within an UASB [35]. In their study, Tian et al [35] discovered that organic nitrogen, organic phosphorus, and COD particulates were effectively separated/removed (> 90%) by anaerobic bacteria in an UASB via bio occulation and the production of EPS.…”

“…Anaerobic bacteria facilitate the degradation and assimilation of organic matter, leading to a decrease in the concentrations of organic nitrogen and organic phosphorus [24,35]. Anaerobic bacteria, according to Tang et al [24], transforms the solid organic matter into its soluble form.…”

The Application of an Upflow Anaerobic Sludge Blanket Reactor in the Treatment of Brewery and Dairy Wastewater: A Critical Review

“…The good performance of this hybrid system was shown in many early studies; for example, high COD and TN removal rates were achieved in a study concerning sewage water treatment, with an HRT of 5-12 h and OLR of 1-2 g-COD/L•d, i.e., a COD removal rate of more than 92% and 68-83% for TN removal [117]. Another Shredded waste plastic bottles 0.263 (3) 0.067 (4) 0.023 89.2-94.55 (3) 60.52-67.59 (4) 12.9-78.1 (5) 25 Nd 20 ± 3 [121] (1) -for DHS, (2) -for FPU, (3) -for TCOD, (4) -for SCOD, (5) -for TN removal, Nd-no data.…”