A Modified ASTM Semi-Continuous Activated Sludge Test to Compare Nonionic Surfactant Biological Removal

2009 ◽  
pp. 393-393-16
Author(s):  
AM Nielsen ◽  
PA Filler ◽  
JE Heinze ◽  
TM Lachocki
Keyword(s):  
Activated Sludge ◽  
Nonionic Surfactant ◽  
Biological Removal

Biological removal of selenate and ammonium by activated sludge in a sequencing batch reactor

2017 ◽  
Vol 229 ◽  
pp. 11-19 ◽  
Author(s):  
J. Mal ◽  
Y.V. Nancharaiah ◽  
E.D. van Hullebusch ◽  
P.N.L. Lens
Keyword(s):  
Activated Sludge ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Biological Removal

Simultaneous biological removal of sulphide and nitrate by autotrophic denitrification in an activated sludge system

2006 ◽  
Vol 53 (12) ◽  
pp. 91-99 ◽  
Author(s):  
I. Manconi ◽  
A. Carucci ◽  
P. Lens ◽  
S. Rossetti
Keyword(s):  
Activated Sludge ◽  
Removal Efficiency ◽  
Electron Donor ◽  
Product Formation ◽  
Fish Analysis ◽  
Autotrophic Denitrification ◽  
Biological Removal ◽  
N Removal ◽  
Activated Sludge Reactor ◽  
Denitrification Process

The feasibility of an autotrophic denitrification process in an activated sludge reactor, using sulphide as the electron donor, was tested for simultaneous denitrification and sulphide removal. The reactor was operated at nitrate (N) to sulphide (S) ratios between 0.5 and 0.9 to evaluate their effect on theN-removal efficiency, the S-removal efficiency and the product formation during anoxic oxidation of sulphide. One hundred per cent removal of both nitrate and sulphide was achieved at a NLR of 7.96 mmol N·L−1·d−1 (111.44 mg NO3−-N·L−1·d−1) and at a N/S ratio of 0.89 with complete oxidation of sulphide to sulphate. The oxygen level in the reactor (10%) was found to influence the N-removal efficiency by inhibiting the denitrification process. Moreover, chemical (or biological) oxidation of sulphide with oxygen occurred, resulting in a loss of the electron donor. FISH analysis was carried out to study the microbial population in the system.

Magnesium requirement for biological removal of phosphate by activated sludge

1988 ◽  
Vol 66 (6) ◽  
pp. 657-666 ◽  
Author(s):  
Hiroshi Imai ◽  
Kazuo Endoh ◽  
Takeshi Kozuka
Keyword(s):  
Activated Sludge ◽  
Biological Removal

Petro® concept: a tentative approach to biological phosphorus removal incorporating waste stabilisation ponds

2000 ◽  
Vol 42 (10-11) ◽  
pp. 223-229 ◽  
Author(s):  
O. V. Shipin ◽  
P. G. Meiring ◽  
J. R. Hoffmann
Keyword(s):  
Activated Sludge ◽  
High Rate ◽  
Biological Nutrient Removal ◽  
Biological Phosphorus Removal ◽  
Waste Stabilisation Ponds ◽  
Biological Removal ◽  
Activated Sludge Reactor ◽  
Calcium Magnesium ◽  
Additional Process ◽  
Biological Phosphorus

Ponding which is usually considered a low tech process can be successfully integrated with downstream Biological Nutrient Removal (BNR) facility. The PETRO system incorporating ponds and downstream trickling filter (TF) or activated sludge process (ASP) is a technology which offers simplicity of O and M combined with biological removal of P and N. It is feasible to produce in a primary facultative pond with a deep fermentation pit quantities of readily biodegradable substrates sufficient to meet the requirements of phosphate accumulating organisms (PAO) in a downstream BNR facility. Malodorous conditions are dealt with by high rate recirculation. This novel low tech approach is a step towards a more straightforward BNR process. PETRO concept features phenomenon of algae-assisted chemical P-removal in activated sludge reactor. The process results in precipitation of inorganic phosphates apparently in a form of calcium/magnesium salts. Possible mechanism of this additional process which removes up to several milligrams per litre of inorganic P is discussed.

Treatment of farm dairy effluent with hybrid upflow multilayer bioreactor and activated sludge module

2010 ◽  
Vol 61 (7) ◽  
pp. 1683-1690 ◽  
Author(s):  
D. F. Shams ◽  
N. Singhal ◽  
P. Elefsiniotis ◽  
A. Johnson
Keyword(s):  
Activated Sludge ◽  
Oxygen Demand ◽  
Cod Removal ◽  
Synthetic Wastewater ◽  
Aeration Tank ◽  
Dairy Effluent ◽  
Biological Removal ◽  
Operational Variables ◽  
Farm Dairy Effluent ◽  
Good Potential

Biological removal of nitrogen and carbon from farm dairy effluent (FDE) was studied with two laboratory-scale systems following nitrification and denitrification processes. Each system consisted of an upflow multilayer bioreactor (UMBR) as a pre-denitrification unit, an aeration tank (AT) as nitrification unit and a secondary clarifier. The optimization of two operational variables, total hydraulic retention time (HRT) and internal recycle (IR) rate with both real-FDE and a synthetic-wastewater were investigated. First, HRTs of 2, 3, 4 and 5 days were tested with synthetic-wastewater at uniform IR rate. The HRT of 4 days proved optimum with high efficiencies for nitrification (>90%), denitrification (>90%) and total chemical oxygen demand (COD) removal (∼90%). The lowest efficiency was recorded at 2 days HRT with 7% nitrification efficiency. This was followed by experimentation with IR rates of 200%, 300% and 400% on both real-FDE and synthetic-wastewater at optimized HRT. The increase in IR to 300% improved the denitrification potential and overall performance with continuous high nitrification efficiency and COD removal whereas IR of 400% retarded the process. The application of combined UMBR and activated sludge system showed good potential for biological removal of nitrogen from FDE.

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