Effect of Sludge Retention Time in a Continuous-Flow Two-Sludge System

2013 ◽  
Vol 316-317 ◽  
pp. 563-566
Author(s):  
Yu Jiao Luo ◽  
Yi Ming Chen ◽  
Ling Feng Qiu
Keyword(s):  
Retention Time ◽  
Phosphorus Removal ◽  
Continuous Flow ◽  
Phosphorus Uptake ◽  
Reflux Ratio ◽  
Biological Phosphorus Removal ◽  
Sludge Retention Time ◽  
Basic Operating ◽  
Biological Phosphorus ◽  
Bypass Ratio

A continuous-flow two-sludge system was operated for efficient enhanced biological phosphorus removal. Phosphorus uptake took place solely under anoxic conditions with simultaneous denitrification in this system. Basic operating condition, namely sludge retention time was chosen as variable in order to assess its impact on the system performance. The experimental results indicated that the system could work stably and efficiently when the inflow was 100 L/h, the sludge retention time was 10 d, the internal bypass ratio was 30% and the reflux ratio was 30%.

Effect of the anaerobic solids retention time on enhanced biological phosphorus removal

1994 ◽  
Vol 30 (6) ◽  
pp. 193-202 ◽  
Author(s):  
Yoshitaka Matsuo
Keyword(s):  
Retention Time ◽  
Phosphorus Removal ◽  
Continuous Flow ◽  
Phosphate Removal ◽  
Substrate Uptake ◽  
Enhanced Biological Phosphorus Removal ◽  
Biological Phosphorus Removal ◽  
Solids Retention ◽  
Biological Phosphorus ◽  
P Removal

Three continuous flow enhanced biological phosphorus removal (EBPR) systems were operated to investigate the effect of the anaerobic SRT on the phosphate removal. The P removal in the system with a short anaerobic SRT declined due to growth of non phosphate accumulating microbes which competed in anaerobic substrate uptake against polyphosphate accumulating bacteria. The phosphorus removal, however, was improved by extending the anaerobic SRT. Restoration and stabilization of P removal by the long anaerobic SRT were confirmed in two other systems.

Biological denitrifying phosphorus removal in SBR: effect of added nitrate concentration and sludge retention time

2001 ◽  
Vol 43 (3) ◽  
pp. 191-194 ◽  
Author(s):  
M. Merzouki ◽  
N. Bernet ◽  
J.-P. Deigenès ◽  
R. Moletta ◽  
M. Benlemlih
Keyword(s):  
Retention Time ◽  
Phosphorus Removal ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Synthetic Wastewater ◽  
Biological Phosphorus Removal ◽  
Denitrifying Phosphorus Removal ◽  
Sludge Retention Time ◽  
Two Parameters ◽  
Biological Phosphorus

Optimizing anoxic biological phosphorus removal in the anaerobic-anoxic sequencing batch reactor (A2 SBR) was observed to depend on two parameters: the amount of added nitrate and the sludge retention time (SRT). The concentration of 120 mg N-NO3 · l-1 in the anoxic medium and the SRT of 15 days were determined as optimal for a complete phosphorus removal in the A2 SBR. The reactor was supplied with synthetic wastewater containing 800 mg COD.l-1 acetic acid, 240 mg N-NH4·l-1 and 30 mg P-PO4·l-1. This study was completed by microscopic observations which revealed three morphological types of phosphate-accumulating bacteria (PAB).

The Effect of PHA on Enhanced Biological Phosphorus Removal

2012 ◽  
Vol 610-613 ◽  
pp. 1343-1348
Author(s):  
Wei Han ◽  
Linjiang Yuan ◽  
Lu Chai ◽  
Kai Zhao ◽  
Guang Zhu Li
Keyword(s):  
Energy Storage ◽  
Carbon Source ◽  
Retention Time ◽  
Phosphorus Removal ◽  
Enhanced Biological Phosphorus Removal ◽  
Biological Phosphorus Removal ◽  
Sludge Retention Time ◽  
Removal Capacity ◽  
Intracellular Energy ◽  
Biological Phosphorus

Used A/O-SBR(anaerobic/aerobic alternating enhanced biological phosphorus removal system) to study carbon source and phosphate accumulating organisms (PAO) intracellular energy storage substance transformation, also studied PAO’s phosphorus removal capacity. PAO could uptake quick degradation organic matters and synthesis polyhydroxyalkanoates(PHA). PHA was a kind of intracellular energy storage substance, its content could affect PAO’s phosphorus removal capacity. When carbon source was plentiful, PAO could synthesis a lot of PHA, phosphorus removal capacity could reach 38.16 mgp/gvss. Sludge retention time could affect PAO synthesis PHA of quantity and structure. Along with the sludge retention time growth, intracellular PHA content was increased, and phosphorus uptake of desired aerobic time continues to decrease, so increasing the phosphorus removal efficiency. When the municipal sewage as carbon source, PHA was mainly composed of PHB(poly-ß-hydroxyvalerate) and PHV(poly-ß-hydroxyvalerate). Along with the sludge retention time prolongation, PAO could synthesis more PHV, PHB content was remain unchanged, PHA composition structure was changed.

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