Proliferation of glycogen accumulating organisms induced by Fe(III) dosing in a domestic wastewater treatment plant

2006 ◽  
Vol 54 (1) ◽  
pp. 101-109 ◽  
Author(s):  
A. Jobbágy ◽  
B. Literáthy ◽  
M.-T. Wong ◽  
G. Tardy ◽  
W.-T. Liu
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Wastewater Treatment Plant ◽  
Phosphorus Deficiency ◽  
Treatment Plant ◽  
Domestic Wastewater ◽  
Chemical Precipitation ◽  
Microbiological Analysis ◽  
Domestic Wastewater Treatment ◽  
Polyphosphate Accumulating Organisms

To meet the effluent requirements given for the sensitive receiving body, the Southpest Wastewater Treatment Plant of Budapest, Hungary uses a combined activated sludge-biofilter system with chemical precipitation for P removal. Causes of the proliferation of glycogen accumulating organisms (GAOs) observed in the unaerated/oxic activated sludge unit of this system were investigated both in full-scale and in lab-scale experiments combined with a detailed analysis of the microbial communities. Concentration profile measurements throughout the 8-stage activated sludge unit indicated anaerobic conditions in the first two unaerated reactors and low orthophosphate level (<1 mg l−1) in all of the stages that could not be attributed to the influent quality, but to Fe (III)-dosing to the returned activated sludge. Microbiological analysis revealed the presence of GAOs from the GB group in the Gammaproteobacteria and occasionally tetrad-forming organisms from Actinobacteria, and the absence of Rhodocyclus-related polyphosphate accumulating organisms (PAOs) in the activated sludge samples. Comparative lab-scale studies carried out in two identically arranged UCT-systems with staged anoxic reactors also confirmed that Fe (III)-dosing may result in phosphorus deficiency of the microbial niche, leading to the suppression of growth and EBPR activity of PAOs and to the proliferation of GAOs.

scholarly journals EXPLOITATION OF THE DOMESTIC WASTEWATER TREATMENT PLANT BY ACTIVATED SLUDGE IN THE AIRPORT AREA OF THE CITY BEN SLIMANE (MOROCCO)

2020 ◽  
Vol XLIV-4/W3-2020 ◽  
pp. 303-308 ◽  
Author(s):  
M. Najy ◽  
F. Z. Talbi ◽  
H. Ech-Chafay ◽  
M. Lachhab ◽  
M. El Qryefy ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Domestic Wastewater ◽  
Physicochemical Analysis ◽  
Organic Load ◽  
Mineral Matter ◽  
Domestic Wastewater Treatment ◽  
Household Water

Abstract. Domestic wastewater (toilet water and household water from kitchens) is evacuated in unit or separate networks to the purification station (STEP) in order to eliminate their waste; organic and mineral matter, dissolved and suspended before discharging them into the natural environment or reusing them in irrigation. The main purpose of this work is to operate the wastewater treatment plant in the Ben Slimane Airport area by using activated sludge, this process consists of destroying pollutants and microorganisms by bacteria formed in the clarifier. Moreover, the operation of the station was considered by controlling the sensors installed in each basin to promote their optimization, in addition, the physicochemical analysis was carried out in the STEP laboratory. The results found for the parameters studied showed the very effective reduction of the organic load of the wastewater treatment plant, so these values meet the discharge standards defined by Moroccan legislation.

Volatile organic compound emissions during the composting of biosolids from a domestic wastewater treatment plant

2002 ◽  
Vol 46 (10) ◽  
pp. 195-198 ◽  
Author(s):  
C.X. Ramos ◽  
S.L. Estévez ◽  
E. Giraldo
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Solid Phase ◽  
Treatment Plant ◽  
Domestic Wastewater ◽  
Aeration System ◽  
Domestic Wastewater Treatment ◽  
Emission Behavior ◽  
Volatile Organic Compound Emissions ◽  
Aliphatic And Aromatic Hydrocarbons

VOCs emitted by two composting static piles of biosolids coming from the “El Salitre” wastewater treatment plant (Bogotá, Colombia) were analysed during the composting process. Each pile in its sampling time was maintained with a different aeration system. The sampling was made using Solid Phase Microextraction (SPME); separation and identifications were made using Gas Chromatography (GC) coupled to Mass Spectrometry (MS). Aliphatic and aromatic hydrocarbons, chlorinated compounds, ketones, mercaptans, alcohols and amines were identified in concentrations greater than the norms stipulated by the EPA for inhalation in humans beings. The emission behavior varied according to the aeration system used.

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