Modelling the effects of ferric salt dosing for chemical phosphorus removal on the settleability of activated sludge

The German design guideline A 131 “Design of single stage activated sludge plants” was amended in 1999. The main changes of the guideline from 1991 are outlined. The design procedure for plants with nitrogen and phosphorus removal is presented.

Download Full-text

Glycogen accumulating population and its anaerobic substrate uptake in anaerobic-aerobic activated sludge without biological phosphorus removal

Water Research ◽

10.1016/0043-1354(95)00121-z ◽

1996 ◽

Vol 30 (1) ◽

pp. 75-82 ◽

Cited By ~ 92

Author(s):

Wen-Tso Liu ◽

Takashi Mino ◽

Kazunori Nakamura ◽

Tomonori Matsuo

Keyword(s):

Activated Sludge ◽

Phosphorus Removal ◽

Substrate Uptake ◽

Biological Phosphorus Removal ◽

Biological Phosphorus

Download Full-text

Start-Up of A2/O Humic Activated Sludge Systemphosphorus Removal Efficiency Analysis

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.113-116.2201 ◽

2010 ◽

Vol 113-116 ◽

pp. 2201-2207 ◽

Cited By ~ 2

Author(s):

Jun Yin ◽

Lei Wu ◽

Ke Zhao ◽

Yu Juan Yu

Keyword(s):

Activated Sludge ◽

Removal Efficiency ◽

Phosphorus Removal ◽

Removal Rate ◽

Phosphorus Uptake ◽

Phosphorus Release ◽

Activated Sludge System ◽

Start Up ◽

Article Analysis ◽

Sludge Activity

In this article, analysis the start-up of A2/O humic activated sludge system phosphorus removal efficiency and the characteristics of anaerobic phosphorus release, aerobic phosphorus uptake, sludge activity and their change in the Series Technologies process. The results show that A2/O humic activated sludge system phosphorus removal rate stabilized at 90.7% ~ 97.6%. Sludge activity except for anoxic zone 2 increased, along the process showed a gradual decrease trend.

Download Full-text

A Parametric Model for Biological Excess Phosphorus Removal

Water Science & Technology ◽

10.2166/wst.1983.0112 ◽

1983 ◽

Vol 15 (3-4) ◽

pp. 127-152 ◽

Cited By ~ 23

Author(s):

I P Siebritz ◽

G A Ekama ◽

G v R Marais

Keyword(s):

Activated Sludge ◽

Phosphorus Removal ◽

Parametric Model ◽

Municipal Waste ◽

Anaerobic Reactor ◽

New Process ◽

Fractional Mass ◽

Activated Sludge Processes ◽

P Removal

Biological excess phosphorus removal in nitrification-denitrification single sludge activated sludge processes is shown to be stimulated by having a concentration of rapidly biodegradable COD (Sbsa) ≧25 mg/ℓ in the anaerobic reactor; the magnitude of the P removal is determined by a P removal propensity factor (Pf) defined by the product of (Sbsa−25) and the fractional mass of sludge in the anaerobic reactor. Sbsa is rapidly depleted by nitrate entering the anaerobic reactor; in the Phoredox process treating municipal waste flows if the TKN/COD ratio of the influent is greater than about 0,08 mgN/mgCOD the process, if designed to ensure efficient nitrification, is unlikely to remove all the nitrate and nitrate is recycled to the anaerobic reactor whereupon P removal declines. A new process is proposed that protects the anaerobic reactor from the nitrate in the effluent; tests indicate that this process can give excess P removal for TKN/COD ratios up to 0,14 mgN/mgCOD.

Download Full-text

Efficiency of Biological Phosphorus Removal by Filamentous Bacteria

Chemistry-Didactics-Ecology-Metrology ◽

10.1515/cdem-2016-0010 ◽

2016 ◽

Vol 21 (1-2) ◽

pp. 117-123 ◽

Cited By ~ 1

Author(s):

Alicja Machnicka ◽

Klaudiusz Grübel

Keyword(s):

Activated Sludge ◽

Phosphorus Removal ◽

Water Environment ◽

Treatment Plant ◽

Chemical Precipitation ◽

Heterogeneous Structure ◽

Filamentous Bacteria ◽

Biological Phosphorus Removal ◽

High Concentration ◽

Sludge Flocs

AbstractPhosphorus removal in wastewater treatment plant is carried out by chemical precipitation, advanced biological treatment or a combination of both. One of the biggest problems with high concentration of phosphorus in water environment is eutrophication. Activated sludge flocs have a heterogeneous structure, which consist of a variety of microorganisms. Filamentous bacteria are normally present in the activated sludge and have ability to assimilation of phosphorus. In this study phosphorus accumulation by isolated filamentous bacteria from activated sludge foam was present.

Download Full-text