Nitrate removal from high strength nitrate-bearing wastes in granular sludge sequencing batch reactors

2016 ◽  
Vol 121 (2) ◽  
pp. 191-195 ◽  
Author(s):  
Tulasi Venkata Krishna Mohan ◽  
Kadali Renu ◽  
Yarlagadda Venkata Nancharaiah ◽  
Pedapati Murali Satya Sai ◽  
Vayalam Purath Venugopalan
Keyword(s):  
Nitrate Removal ◽  
Granular Sludge ◽  
High Strength ◽  
Batch Reactors ◽  
Sequencing Batch Reactors

Effect of C/N ratio on denitrification of high-strength nitrate wastewater in anoxic granular sludge sequencing batch reactors

2016 ◽  
Vol 91 ◽  
pp. 441-448 ◽  
Author(s):  
T.V. Krishna Mohan ◽  
Y.V. Nancharaiah ◽  
V.P. Venugopalan ◽  
P.M. Satya Sai
Keyword(s):  
Granular Sludge ◽  
High Strength ◽  
Batch Reactors ◽  
Sequencing Batch Reactors

scholarly journals Effect of the famine phase length on the properties of aerobic granular sludge treating greywater

2021 ◽  
Author(s):  
U. Rojas-Z ◽  
C. Fajardo-O ◽  
I. Moreno-Andrade ◽  
O. Monroy
Keyword(s):  
Granular Sludge ◽  
High Strength ◽  
Volume Index ◽  
Aerobic Granular Sludge ◽  
Batch Reactors ◽  
Substrate Uptake ◽  
Sequencing Batch Reactors ◽  
Uptake Rates ◽  
Key Factor ◽  
Phase Length

Abstract Sequencing batch reactors (SBR) treating high-strength greywater need an aerobic granular sludge (AGS) with good properties, such as a low sludge volume index (SVI) and high settling velocities and substrate uptake rates to yield short settling and aeration stages. To promote the formation of stable granular sludge, the length of the famine phase could be a key factor. In this regard, the effect of the duration of this variable on the AGS properties was assessed by comparing a gradual versus an abrupt reduction of the famine phase in two SBR treating greywater. The initial average famine phase of 3.3 h was gradually reduced to 0.3 h over 20 weeks in one reactor, and abruptly in another one. This condition induced filamentous outgrowth, as well as the deterioration on the properties of the sludge; being more accelerated the effect when the famine periods were abruptly shortened. In both cases the reduction on the famine periods induced increased organic loading rates, which led to degranulation events when it was higher than 2.5 g-COD g-VSS−1 d−1. Afterwards, the biomass adapted to this situation, by forming new small-filamentous aggregates with similar SVI to that of the stable AGS formed with the longest famine period.

Identification of trigger factors selecting for polyphosphate- and glycogen-accumulating organisms in aerobic granular sludge sequencing batch reactors

2013 ◽  
Vol 47 (19) ◽  
pp. 7006-7018 ◽  
Author(s):  
David G. Weissbrodt ◽  
Guillaume S. Schneiter ◽  
Jean-Marie Fürbringer ◽  
Christof Holliger
Keyword(s):  
Granular Sludge ◽  
Aerobic Granular Sludge ◽  
Batch Reactors ◽  
Sequencing Batch Reactors ◽  
Trigger Factors

scholarly journals Study on aerobic granular sludge formation in sequencing batch reactors for tapioca wastewater treatment

2013 ◽  
Vol 16 (1) ◽  
pp. 40-48
Author(s):  
Phuong Thi Thanh Nguyen ◽  
Phuoc Van Nguyen ◽  
Anh Cam Thieu
Keyword(s):  
Granular Sludge ◽  
Biomass Accumulation ◽  
Synthetic Wastewater ◽  
Aerobic Granular Sludge ◽  
Organic Loading Rate ◽  
Anaerobic Sludge ◽  
Batch Reactors ◽  
Aerobic Granules ◽  
Toxic Substances ◽  
Sequencing Batch Reactors

Aerobic granular sludge has attracted extensive interest of researchers since the 90s due to the advantages of aerobic granules such as good settling ability, high biomass accumulation, being resistant to high loads and being less affected by toxic substances. Studies, however, which have mainly been carried out on synthetic wastewater, cannot fully evaluate the actual ability of aerobic granules. Study on aerobic granular sludge was performed in sequencing batch reactors, using seeding sludge taken from anaerobic sludge and tapioca wastewater as a substrates. After 11 weeks of operation, the granules reached the stable diameter of 2- 3 mm at 3.7 kgCOD/m3.day organic loading rate. At high organic loads, in range of 1.6 - 5 kgCOD/m3.day, granules could treat effectively COD, N, P with performance of 93 – 97%; 65 – 79% and 80 – 95%, respectively.

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