Study on the Impact of DO and Organic Matter on Aerobic Granular Sludge Treating Municipal Sewage

2014 ◽  
Vol 989-994 ◽  
pp. 603-606 ◽  
Author(s):  
Yang Yu ◽  
Hai Jiao Yu ◽  
Chen Ci Ma
Keyword(s):  
Organic Matter ◽  
Total Nitrogen ◽  
Removal Rate ◽  
Granular Sludge ◽  
Ammonia Nitrogen ◽  
Aerobic Granular Sludge ◽  
Municipal Sewage ◽  
Aerobic Conditions ◽  
Do Concentration ◽  
The Impact

The experiment uses municipal sewage as the research object and runs SBR reactor in completely aerobic conditions. Through controlling different of DO concentration and COD concentration, we study spreading comparison. The results show that when DO concentration was 1mg/L, the removal effect of aerobic granular sludge process in SBR treating municipal sewage was best, the average removal rate of COD, ammonia nitrogen, total nitrogen and phosphorous was 90.12%,98.95%,87.65% and 83.74% respectively. When COD concentration of influent was about 400mg/L, the treatment effects of aerobic granular sludge for COD, ammonia nitrogen, total nitrogen and phosphorous were all better, the average removal rate was up to 92.33%,98.83%,88.17% and 80.25% respectively.

Impact of dissolved oxygen concentration on membrane filtering resistance and soluble organic matter characteristics in membrane bioreactors

2008 ◽  
Vol 57 (2) ◽  
pp. 161-165 ◽  
Author(s):  
Kyung-Nan Min ◽  
Sarina J. Ergas ◽  
Anna Mermelstein
Keyword(s):  
Molecular Weight ◽  
Organic Matter ◽  
Dissolved Oxygen ◽  
Weight Fraction ◽  
Total Resistance ◽  
Soluble Organic Matter ◽  
Aerobic Conditions ◽  
Do Concentration ◽  
The Impact ◽  
Molecular Weight Fractions

This study investigated the impact of dissolved oxygen (DO) concentration on membrane filtering resistance, soluble organic matter (SOM) and extracellular polymeric substance (EPS) characteristics in a membrane bioreactor (MBR). A laboratory-scale MBR was operated under DO limited (0.2 mg L−1 DO) and fully aerobic (3.7 and 5.4 mg L−1 DO) conditions. Membrane filtering resistance was determined for the mixed liquor suspended solids (MLSS) and for resuspended microbial biomass after removing SOM. Regardless of the DO concentration, the cake resistance (Rc) was approximately 95 percent of the total resistance (Rt). The membrane cake resistance was found to decrease significantly after removing the SOM. The total resistance caused by the resuspended biomass was 29 percent of that caused by the MLSS under DO limited conditions, while the total resistance caused by resuspended biomass was 41 to 48 percent of that caused by the MLSS under fully aerobic conditions. Under DO limited conditions, SOM in the MLSS contained a larger amount of high molecular weight compounds, leading to higher cake resistance than under fully aerobic conditions. There was significant variation in the molecular weight fractions of the EPS, with no clear relationship with DO concentration. There was also no distinct relationship between membrane filtering resistance and molecular weight fraction of the EPS.

Research on Filamentous Bulking in Aerobic Granular Sludge

2011 ◽  
Vol 356-360 ◽  
pp. 1267-1271
Author(s):  
Feng Jiang ◽  
Yang Li Zhao ◽  
Shuai Fu Chen ◽  
Rui Liang
Keyword(s):  
Removal Rate ◽  
Batch Reactor ◽  
Granular Sludge ◽  
Ammonia Nitrogen ◽  
Synthetic Wastewater ◽  
Aerobic Granular Sludge ◽  
Feed Water ◽  
Filamentous Bulking ◽  
Hydrodynamic Shear ◽  
Cultivation Process

Aerobic granular sludge (AGS) was cultivated successfully in a sequencing batch reactor (SBR), which has floc sludge as seeding sludge in synthetic wastewater. Removal efficiency in the reactor during the entire working period was investigated. Controlling strategy for filamentous bulking and the effect of a filamentous microorganism on granulation of sludge were discussed. The results showed that whether filamentous bulking occurred or not, there was little impact on the removal rate of phosphorus and ammonia nitrogen, which maintain about 90% and 95%, respectively. Increasing the hydrodynamic shear force has certain effects on the controlling of filamentous bulking. Declining C/N ratio, balancing nutrition in feed water can fundamentally solve the problem of filamentous bulking in the cultivation process of aerobic granular sludge.

Research of Carbon and Nitrogen Ratio and Sludge Stability in Aerobic Granular Sludge Bioreactor

2012 ◽  
Vol 518-523 ◽  
pp. 473-477
Author(s):  
Xia Zhao ◽  
Hui Xia Feng ◽  
Feng Jiang ◽  
Na Li Chen ◽  
Xiao Chun Wang
Keyword(s):  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Removal Rate ◽  
Batch Reactor ◽  
Granular Sludge ◽  
Ammonia Nitrogen ◽  
Nitrifying Bacteria ◽  
Aerobic Granular Sludge ◽  
Nitrogen Ratio ◽  
The Stability

In sequencing batch reactor aerobic granular sludge was cultivated, and the influence of influent C/N ratio to aerobic granular sludge was studied. The results showed that the granulation and the settling ability of the sludge were poor in high C/N, however, low C/N was beneficial to the accumulation of microorganism in reactor and MLSS could reach to as high as 8740 mg/L. Lower C/N ratio would lead to increase of particle size and disintegrate of loose structure and overgrowth on filamentous microbe, these were disadvantage of the stability of the system. It was not obvious that influent C/N ratio affected on the organic removal. The COD removal maintained at 87% after the preliminary form particles were formed in reactor. When C/N ratio was 100:15~100:35, the phosphorus removal efficiency was good. If C/N ratio was too high or too low, the formation of sludge granulation would be affected in the process. The influence of C/N ratio to ammonia nitrogen removal efficiency was obvious. While C/N ratio was 100:10, granular sludge had good simultaneous nitrification and denitrification performance, and the average removal of ammonia nitrogen attained to 91%. But low C/N ratio was able to inhibit the activity of nitrifying bacteria and denitrifying bacteria. At that time, ammonia nitrogen removal rate declined sharply in the system.

Hydrolysis of organic wastewater particles in laboratory scale and pilot scale biofilm reactors under anoxic and aerobic conditions

1998 ◽  
Vol 38 (8-9) ◽  
pp. 179-188 ◽  
Author(s):  
K. F. Janning ◽  
X. Le Tallec ◽  
P. Harremoës
Keyword(s):  
Organic Matter ◽  
Mass Balance ◽  
Particulate Organic Matter ◽  
Removal Rate ◽  
Pilot Scale ◽  
Laboratory Scale ◽  
Synthetic Wastewater ◽  
Aerobic Conditions ◽  
Biofilm Reactors ◽  
Hydrolysis Of

Hydrolysis and degradation of particulate organic matter has been isolated and investigated in laboratory scale and pilot scale biofilters. Wastewater was supplied to biofilm reactors in order to accumulate particulates from wastewater in the filter. When synthetic wastewater with no organic matter was supplied to the reactors, hydrolysis of the particulates was the only process occurring. Results from the laboratory scale experiments under aerobic conditions with pre-settled wastewater show that the initial removal rate is high: rV, O2 = 2.1 kg O2/(m3 d) though fast declining towards a much slower rate. A mass balance of carbon (TOC/TIC) shows that only 10% of the accumulated TOC was transformed to TIC during the 12 hour long experiment. The pilot scale hydrolysis experiment was performed in a new type of biofilm reactor - the B2A® biofilter that is characterised by a series of decreasing sized granular media (80-2.5 mm). When hydrolysis experiments were performed on the anoxic pilot biofilter with pre-screened wastewater particulates as carbon source, a rapid (rV, NO3=0.7 kg NO3-N/(m3 d)) and a slowler (rV, NO3 = 0.3 kg NO3-N/(m3 d)) removal rate were observed at an oxygen concentration of 3.5 mg O2/l. It was found that the pilot biofilter could retain significant amounts of particulate organic matter, reducing the porosity of the filter media of an average from 0.35 to 0.11. A mass balance of carbon shows that up to 40% of the total incoming TOC accumulates in the filter at high flow rates. Only up to 15% of the accumulated TOC was transformed to TIC during the 24 hour long experiment.

Performance of aerobic granular sludge at variable circulation rate in anaerobic–aerobic conditions

2014 ◽  
Vol 69 (11) ◽  
pp. 2252-2257 ◽  
Author(s):  
Hasnida Harun ◽  
Aznah Nor Anuar ◽  
Zaini Ujang ◽  
Noor Hasyimah Rosman ◽  
Inawati Othman
Keyword(s):  
Municipal Wastewater ◽  
Granular Sludge ◽  
Ammonia Removal ◽  
Soy Sauce ◽  
Volume Index ◽  
Aerobic Granular Sludge ◽  
Circulation Rate ◽  
Anaerobic Conditions ◽  
Aerobic Conditions ◽  
Mixed Liquor

Aerobic granular sludge (AGS) has been applied to treat a broad range of industrial and municipal wastewater. AGS can be developed in a sequencing batch reactor (SBR) with alternating anaerobic–aerobic conditions. To provide anaerobic conditions, the mixed liquor is allowed to circulate in the reactor without air supply. The circulation flow rate of mixed liquor in anaerobic condition is the most important parameter of operation in the anaerobic-AGS processes. Therefore, this study investigates the effect of circulation rate on the performance of the SBR with AGS. Two identical reactors namely R1 and R2 were operated using fermented soy sauce wastewater at circulation rate of 14.4 and 36.0 l/h, respectively. During the anaerobic conditions, the wastewater was pumped out from the upper part of the reactor and circulated back into the bottom of the reactor for 230 min. A compact and dense AGS was observed in both reactors with a similar diameter of 2.0 mm in average, although different circulation rates were adopted. The best reactor performance was achieved in R2 with chemical oxygen demand removal rate of 89%, 90% total phosphorus removal, 79% ammonia removal, 10.1 g/l of mixed liquor suspended solids and a sludge volume index of 25 ml/g.

Nitrifier Augmentation for High Ammonia Nitrogen Removal by Aerobic Granular Sludge at Low Temperatures

2016 ◽  
Vol 44 (5) ◽  
pp. 525-531 ◽  
Author(s):  
Shuo Wang ◽  
Qianqian Yang ◽  
Wenxin Shi ◽  
Shuili Yu ◽  
Yan Wang ◽  
...  
Keyword(s):  
Nitrogen Removal ◽  
Low Temperatures ◽  
Granular Sludge ◽  
Ammonia Nitrogen ◽  
Aerobic Granular Sludge ◽  
High Ammonia

Start-up of an aerobic granular sequencing batch reactor for the treatment of winery wastewater

2009 ◽  
Vol 60 (4) ◽  
pp. 1049-1054 ◽  
Author(s):  
S. López–Palau ◽  
J. Dosta ◽  
J. Mata-Álvarez
Keyword(s):  
Organic Matter ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Particle Diameter ◽  
Granular Sludge ◽  
Average Density ◽  
Aerobic Granular Sludge ◽  
Organic Load ◽  
Winery Wastewater ◽  
Start Up

Aerobic granular sludge was cultivated in a sequencing batch reactor (SBR) in order to remove the organic matter present in winery wastewater. The formation of granules was performed using a synthetic substrate. The selection parameter was the settling time, as well as the alternation of feast-famine periods, the air velocity and the height/diameter ratio of the reactor. After 10 days of operation under these conditions, the first aggregates could be observed. Filamentous bacteria were still present in the reactor but they disappeared progressively. During the start-up, COD loading was increased from 2.7 to 22.5 kg COD/(m3 day) in order to obtain a feast period between 30 and 60 minutes. At this point, granules were quite round, with a particle diameter between 3.0 and 4.0 mm and an average density of 6 g L−1. After 120 days of operation, synthetic media was replaced by real winery wastewater, with a COD loading of 6 kg COD/(m3 day). The decrease of the organic load implied a reduction of the aggregate diameter and a density increase up to 13.2 g L−1. The effluent was free of organic matter and the solids concentration in the reactor reached 6 g VSS L−1.

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.

Aerobic granular sludge in an SBR-system treating wastewater rich in particulate matter

2004 ◽  
Vol 49 (11-12) ◽  
pp. 41-46 ◽  
Author(s):  
N. Schwarzenbeck ◽  
R. Erley ◽  
P.A. Wilderer
Keyword(s):  
Particle Size ◽  
Organic Matter ◽  
Primary Particle ◽  
Loading Rate ◽  
Granular Sludge ◽  
Aerobic Granular Sludge ◽  
Organic Loading Rate ◽  
Organic Loading ◽  
Particle Uptake ◽  
Tracer Experiments

Aerobic granular sludge was successfully cultivated in a lab-scale SBR-system treating malting wastewater with a high content of particulate organic matter (0.9 gTSS/L). At an organic loading rate (CODtotal) of 3.4 kg/(m3·d) an average removal efficiency of 50% in CODtotal and 80% in CODdissolved was achieved. Fractionation of the COD by means of particle size showed that particles with a diameter less than 25–50 μm could be removed at 80% efficiency, whereas particles bigger than 50 μm were only removed at 40% efficiency. Tracer experiments revealed a dense sessile protozoa population covering the granules. The protozoa appeared to be responsible for primary particle uptake from the wastewater.

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