Research on COD Removal and SOUR of Aerobic Granule with Intermittent Aeration in Continuous Flow System

2012 ◽  
Vol 518-523 ◽  
pp. 478-484 ◽  
Author(s):  
Feng Deng ◽  
Rui Zhang
Keyword(s):  
Removal Efficiency ◽  
Continuous Flow ◽  
Flow Reactor ◽  
Operation Mode ◽  
Granular Sludge ◽  
Cod Removal ◽  
Aerobic Granular Sludge ◽  
Intermittent Aeration ◽  
Cod Removal Efficiency ◽  
The Impact

The impact of intermittent aeration on aerobic granular sludge in a continuous flow reactor was studied. Nine intermittent aeration modes were set up to investigate the change of DO, pH, COD removal efficiency and SOUR. The results showed DO and pH had different change tendencies. The 3-1 mode was the optimal mode under these experiment conditions. In aerating stage, the highest COD removal efficiency could achieve 96.32%. Stopping aeration for one hour, COD removal efficiency could still reach at 90.20%. This operation mode could save about 25% energy consumption theoretically. The comparison of SOUR between continuous aeration and 4-2 mode showed that the intermittent aeration had little effect on granular sludge activity. The theory of stress & damage and unbalanced growth could explain this appearance.

scholarly journals Effects of CuO NPs on the pollutant removal, EPS and microbial community of aerobic granular sludge

2019 ◽  
Vol 131 ◽  
pp. 01129
Author(s):  
Xiaoying Zheng ◽  
Xiaoyao Shao ◽  
Yuan Zhang ◽  
Mengmeng Yang ◽  
Zhi Xu ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Phosphorus Removal ◽  
High Throughput Sequencing ◽  
Cupric Oxide ◽  
Granular Sludge ◽  
Pollutant Removal ◽  
Aerobic Granular Sludge ◽  
High Concentration ◽  
Cuo Nps ◽  
The Impact

With the increasing use of cupric oxide nanoparticles (CuO NPs), its potential environmental toxicity has been concerned nowadays. Aerobic granular sludge (AGS) is a special collection of microorganisms. This research studied under long exposure to the concentration of 5, 10 and 20 mg/L of CuO NPs, pollutants removal efficiency of AGS, extracellular polymers (EPS) and microbial communities in aerobic/anaerobic/anoxic (A/O/A) sequencing batch reactors (SBRs). The results showed that COD removal rates was stable, and the removal efficiencies of TN decreased because of the high concentration CuO NPs. On the 45th day, the TP removal efficiency of the reactor with CuO NPs concentration of 10 mg/L and 20 mg/L decreased to 55.83% and 43.72%, respectively. The denitrifying phosphorus removal-aerobic granular sludge (DPR-AGS) had certain resistance to the short-term impact of CuO NPs, and the phosphorus removal ability decreased at the late stage of the impact test. Besides, CuO NPs decreased the stability of DPR-AGS. High-throughput sequencing showed that CuO NPs decreased microbial diversity of DPR-AGS.

Phenolic refinery wastewater biodegradation by an expanded granular sludge bed reactor

2005 ◽  
Vol 52 (1-2) ◽  
pp. 391-396 ◽  
Author(s):  
F.J. Almendariz ◽  
M. Meraz ◽  
A.D. Olmos ◽  
O. Monroy
Keyword(s):  
Toxic Effect ◽  
Removal Efficiency ◽  
Methane Production ◽  
Granular Sludge ◽  
Cod Removal ◽  
Organic Load ◽  
Refinery Wastewater ◽  
Mineral Supplements ◽  
Cod Removal Efficiency

Refinery spent caustics (SC) were diluted with sour waters (SW) in a ratio 1:7, neutralized with CO2 (SC/SWCO2) and 83% of H2S was striped during this procedure, remaining an aromatic portion that contained 2123, 2730 and 1379 mg L−1 of phenol, p-cresol and o-cresol, respectively. The mixture was treated anaerobically in an EGSB reactor fed with 1.5 gCOD L−1 d−1, without mineral supplements causing loss of COD removal efficiency that dropped to 23%, methane production ceased and no phenol or cresols were biodegraded. The EGSB experiments were resumed by feeding the reactor with nutrients and phenol at 1.0 gCOD L−1 d−1. The mixture SC/SWCO2 added to the phenol load, was step increased from 0.10 to 0.87 gCOD L−1 d−1 maximum. When total organic load was increased to 1.6, COD removal efficiency was 90% and at the highest load attained, 1.87, efficiency dropped to 23% attributed to the toxic effect produced by cresols.

Characteristic of Granular Sludge Bed and Granular Sludge in Interior Diversion Expanded Granular Sludge Bed

2013 ◽  
Vol 726-731 ◽  
pp. 2813-2817
Author(s):  
Guang Li ◽  
Jing Li ◽  
Ke Sun
Keyword(s):  
Removal Efficiency ◽  
Granular Sludge ◽  
Gas Production ◽  
Cod Removal ◽  
Organic Loading Rate ◽  
Anaerobic Sludge ◽  
Cod Removal Efficiency ◽  
Seed Sludge ◽  
Bed Expansion

The interior diversion expanded granular sludge bed was concurrently operated for 140d to study the characteristic of the granular sludge bed. The influent COD concentration varied from 2000mg/L to 22300 mg/L, hydraulic retention time was maintained constant at 24 h and the organic loading rate was changed through a change in substrate concentration. The results showed that the reactor had great COD removal efficiency. When the MLSS was 23.1g/L, the influent COD was 18890mg/L, the COD removal efficiency was 80.4%; The interior diversion EGSB could greatly improve the role of gas-dynamic, when the liquid upflow velocity was 3.55m/h, the gas production was 5.96 L/d shows higher sludge bed expansion rate than 2.77 L/d about 9.5%. During the experimental, the anaerobic sludge has the following properties: the average sludge diameter was increased from 0.41mm to 1.66mm. Observed under the scanning electronic microscopy, we found that the sludge appeared obviously granulation, the bacteria amount and species are more than seed sludge after operation of 50d. It was found that rough surface of anaerobic sludge has clear figure with being covered by mucous lamina, with visible hole or cavity on surface.

Removal Efficiency of Hazardous Material in Cyclohexanone Production Wastewater Applying Anaerobic Upflow Bed Filter

2010 ◽  
Vol 160-162 ◽  
pp. 1440-1444
Author(s):  
Dou Li ◽  
Dong Wei Li
Keyword(s):  
Removal Efficiency ◽  
Granular Sludge ◽  
Hazardous Materials ◽  
Cod Removal ◽  
The Self ◽  
Coagulation Necrosis ◽  
Anaerobic Sludge ◽  
Operational Parameters ◽  
Hazardous Material ◽  
Cod Removal Efficiency

The cyclohexanone production wastewater includes hazardous material such as cyclohexanone and cyclohexane which can harm the vessel of human body resulting in coagulation necrosis of viscera and brain. Our experiment choosed the cyclohexanone production wastewater to be investigated, and used the self-made anaerobic upflow bed filter (UBF) to deal with it. We try to find the optimal operational parameters which can make the degradation of hazardous materials maximizing. The COD removal efficiency was decreasing with the COD of influent’s increasing in starting stage, the shock load made the microbe in UBF can’t adapt the high VLR temporarily. In the running stage, the anaerobic sludge in UBF was incompact and the settleability of sludge was not very well. As the UBF running, the granular sludge shaped up greatly, the COD removal efficiency kept on 80%. The result showed that the UBF reactor was valid for hazardous material in cyclohexanone production wastewater.

Evaluation of UASB Reactor Performance During Start-Up Operation Using Glucose Bearing Synthetic Wastewater

2020 ◽  
Vol 9 (1) ◽  
pp. 32-51
Author(s):  
Revanuru Subramanyam
Keyword(s):  
Removal Efficiency ◽  
Loading Rate ◽  
Granular Sludge ◽  
Cod Removal ◽  
Synthetic Wastewater ◽  
Organic Loading Rate ◽  
Anaerobic Sludge ◽  
Cod Removal Efficiency ◽  
Start Up ◽  
Seed Sludge

This research article describes start-up performance of an UASB (Upflow Anaerobic Sludge Blanket) reactor in terms of chemical oxygen demand (COD) removal efficiency, biogas production, sludge loading rate (SLR), volatile fatty acids (VFA), pH, alkalinity, total solids (TS) and volatile suspended solids (VSS), fed with synthetic wastewater with increased concentrations of glucose. The reactor was loaded up to an OLR (Organic Loading Rate) of 15 kg COD m-3 d-1 and achieved a COD removal efficiency of 82 ±3%. The results showed that digested seed sludge was successfully acclimatized and transformed finally into granular sludge within a period of 120 days. An increase in the accumulation of VFA at high OLRs showed that methanogenesis could be the rate-limiting step in the reactor operation. The SLR and VSS/TS ratio were increased with an increase in OLR. During the initial stages, uniform distribution of VSS concentration and later on maximum VSS concentration were found at port number two at a height of 350 mm. The carbon balance depicts that the maximum percentage of influent COD converted to methane COD. An increase in specific methanogenic activity values with the age of sludge confirmed the transformation of the seed sludge in to a granular sludge.

Continuous flow aerobic granular sludge reactor for dairy wastewater treatment

2015 ◽  
Vol 71 (3) ◽  
pp. 440-445 ◽  
Author(s):  
C. Bumbac ◽  
I. A. Ionescu ◽  
O. Tiron ◽  
V. R. Badescu
Keyword(s):  
Continuous Flow ◽  
Flow Reactor ◽  
Batch Reactor ◽  
Oxygen Demand ◽  
Granular Sludge ◽  
Experimental Period ◽  
Phosphate Removal ◽  
Dairy Wastewater ◽  
Aerobic Granular Sludge ◽  
Removal Efficiencies

The focus of this study was to assess the treatment performance and granule progression over time within a continuous flow reactor. A continuous flow airlift reactor was seeded with aerobic granules from a laboratory scale sequencing batch reactor (SBR) and fed with dairy wastewater. Stereomicroscopic investigations showed that the granules maintained their integrity during the experimental period. Laser diffraction investigation showed proof of new granules formation with 100–500 μm diameter after only 2 weeks of operation. The treatment performances were satisfactory and more or less similar to the ones obtained from the SBR. Thus, removal efficiencies of 81–93% and 85–94% were observed for chemical oxygen demand and biological oxygen demand, respectively. The N-NH+4 was nitrified with removal efficiencies of 83–99% while the nitrate produced was simultaneously denitrified – highest nitrate concentration determined in the effluent was 4.2 mg/L. The removal efficiency of total nitrogen was between 52 and 80% depending on influent nitrogen load (39.3–76.2 mg/L). Phosphate removal efficiencies ranged between 65 and above 99% depending on the influent phosphate concentration, which varied between 11.2 and 28.3 mg/L.

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