Insight into the impact of ZnO nanoparticles on aerobic granular sludge under shock loading

Chemosphere ◽  
2017 ◽  
Vol 173 ◽  
pp. 411-416 ◽  
Author(s):  
Qiulai He ◽  
Zhe Yuan ◽  
Jing Zhang ◽  
Shilu Zhang ◽  
Wei Zhang ◽  
...  
Keyword(s):  
Zno Nanoparticles ◽  
Shock Loading ◽  
Granular Sludge ◽  
Aerobic Granular Sludge ◽  
The Impact ◽  
Insight Into

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.

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.

Analysis for the Impact of Loadings in the Formation Process of Aerobic Granular Sludge

2012 ◽  
Vol 518-523 ◽  
pp. 2340-2343
Author(s):  
Ting Lin ◽  
Xin Gang Wang ◽  
Yu Bin Tang ◽  
Fang Yan Chen
Keyword(s):  
Activated Sludge ◽  
Formation Process ◽  
Granular Sludge ◽  
The Self ◽  
Aerobic Granular Sludge ◽  
Batch Reactors ◽  
Sequencing Batch Reactors ◽  
Removal Rates ◽  
High Sedimentation ◽  
The Impact

The aerobic granular sludge was cultivated in the self-designed sequencing batch reactors (SBR) using ordinary flocculent activated sludge as seeding sludge. In this experiment the effect of different load on the formation of aerobic granular sludge is studied. The formation process of aerobic granular sludge and the capacity of denitrification and phosphorus performance are discussed and characterized. It shows that higher sludge loading is beneficial to the formation of aerobic granular sludge, and mature aerobic granular sludge has high sedimentation speed and the very good decontamination ability. The removal rates of COD, NH4+Subscript text-N and TP are 97%, 85% and 95%.

The Impact of Applying an Internal Substrate Selection Strategy to Improve Aerobic Granular Sludge Formation

2017 ◽  
Vol 2017 (16) ◽  
pp. 96-103
Author(s):  
Rasha Faraj ◽  
Theresa Amante ◽  
Jennifer Warren ◽  
Mariela Mosquera ◽  
Belinda Sturm
Keyword(s):  
Granular Sludge ◽  
Aerobic Granular Sludge ◽  
Selection Strategy ◽  
Substrate Selection ◽  
Sludge Formation ◽  
The Impact

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.

THE IMPACT OF REACTOR HEIGHT/DIAMETER (H/D) RATIO ON AEROBIC GRANULAR SLUDGE (AGS) FORMATION IN SEWAGE

2015 ◽  
Vol 77 (32) ◽  
Author(s):  
Nik Azimatolakma Awang ◽  
Md. Ghazaly Shaaban
Keyword(s):  
Batch Reactor ◽  
Granular Sludge ◽  
Aeration Rate ◽  
Aerobic Granular Sludge ◽  
Organic Loading Rate ◽  
Aerobic Granules ◽  
Working Volume ◽  
Stable Conditions ◽  
The Impact ◽  
Reactor Height

Until now, the development of aerobic granules sludge (AGS) has been extensively reported using sequencing batch reactor (SBR) with reactor height/diameter (H/D) ratio of over 10. This is because the formation process of aerobic granules itself is depending upon the flowing trajectory inside reactor indulge by reactor height and superficial air velocity (SUAV). Thus, this study aims to determine effect of reactor H/D ratio on performance of AGS develop in two SBRS with equal working volume and organic loading rate (OLR). The two SBRs namely as SBR1 and SBR2 had a difference in reactor H/D ratio of 11.3 and 4.4, respectively. At an aeration rate of 4 L/min,  SUAV for SBR1 was two time higher than in SBR2, which were 1.33 cm/s and 0.7 cm/s, respectively. Thus, the SBR2 configuration condition seems unfavorable for development of compact aerobic granules. However, it was found that aerobic granules can be developed in both SBRs at an OLR as low as 0.12 kg CODs/m3 d and up to 0.49 kg CODs/m3 d. Mature aerobic granules were successfully developed after 49 and 89 days of formation, for Batch1 AGS and Batch2 AGS, respectively. At stable conditions, the highest CODs removal and SS effluent for Batch1 AGS and Batch2 AGS were more than 80% and below 26 mg/L, respectively. While effluent performance in both reactors was high, analysis on SVI30 indicated that SBR1 produced more sludge than SBR2. Compare to SBR1, at similar settling time of 15 min, SBR2 provide a short settling distance for biomass which was preferable in case of system breakdown due to shock OLR.

scholarly journals Powdered keramsite as unconventional method of AGS technology support in GSBR reactor with minimum-optimum OLR

2018 ◽  
Vol 44 ◽  
pp. 00024 ◽  
Author(s):  
Joanna Czarnota ◽  
Adam Masłoń ◽  
Monika Zdeb
Keyword(s):  
Batch Reactor ◽  
Granular Sludge ◽  
High Energy ◽  
Aerobic Granular Sludge ◽  
Organic Loading Rate ◽  
Aerobic Granules ◽  
Technology Support ◽  
Technological Parameters ◽  
The Stability ◽  
The Impact

Aerobic Granular Sludge (AGS) technology becomes a very competitive method to activated sludge system. Its main advantages include: high energy efficiency and low investment costs. Despite this fact, intensive research on biogranulation optimization are still carried out, both at laboratory and technical scale. In order to intensify the AGS technology, new methods of biogranulation and ways of improving the stability of aerobic granules are sought. So far, several studies have been conducted in this area, with using among others: chemical coagulants, dosage fragments of granules and powdered materials. The aim of this study was to evaluate the impact of powdered keramsite on the feasibility of rapid aerobic granulation in a GSBR reactor with a minimum-optimum organic loading rate (OLR). The research presents an effective way of cultivating stable aerobic granules in a Granular Sequencing Batch Reactor (GSBR) under specific technological parameters.

scholarly journals The Impact of Different Powdered Mineral Materials on Selected Properties of Aerobic Granular Sludge

Molecules ◽  
2020 ◽  
Vol 25 (2) ◽  
pp. 386 ◽  
Author(s):  
Joanna Czarnota ◽  
Adam Masłoń ◽  
Monika Zdeb ◽  
Grzegorz Łagód
Keyword(s):  
Extracellular Polymeric Substances ◽  
Granular Sludge ◽  
Biological Properties ◽  
Volume Index ◽  
Aerobic Granular Sludge ◽  
Batch Reactors ◽  
Sequencing Batch Reactors ◽  
Mean Values ◽  
The Impact ◽  
Mg Content

This study aimed to evaluate and compare the physical, chemical and biological properties of aerobic granular sludge from reactors with the addition of different powdered mineral materials. These properties have a significant impact on the efficiency of systems in which the biomass in granular form is used. Four identical granular sequencing batch reactors (GSBRs) were adopted for the research performed on a laboratory scale (R1—control reactor; R2, R3 and R4—with materials, PK, PG and PL respectively). The results indicate that the addition of powdered mineral materials improved the properties of biomass in reactors. The SVI5/SVI30 ratio values were significantly lower in the reactors with added materials (approx. 1.3 ± 0.3). The mean values of the sludge volume index at 30 min were the lowest in the R2 (39.8 ± 8.6 mL/g) and R4 (32.8 ± 10.7 mL/g) reactors. The settling velocity of biomass was the highest in the R2 reactor (15.4 ± 6.1 m/h). In the early days of the study, the highest extracellular polymeric substances (EPS) content was found in the biomass from the reactors to which the materials with higher Ca and Mg content were added (380.18–598.30 mg/g MLVSS). The rate of specific oxygen uptake (SOUR) by biomass indicated an insufficient biomass content in the R1 reactor—to 7.85 mg O2/(g MLVSS∙h)—while in the reactors with materials, the SOUR values were at the higher levels.

scholarly journals Cultivation of aerobic granular sludge for the treatment of food-processing wastewater and the impact on membrane filtration properties

2020 ◽  
Author(s):  
H. Stes ◽  
M. Caluwé ◽  
L. Dockx ◽  
R. Cornelissen ◽  
P. De Langhe ◽  
...  
Keyword(s):  
Membrane Filtration ◽  
Feeding Strategy ◽  
Batch Reactor ◽  
Granular Sludge ◽  
Suspended Solid ◽  
Volume Index ◽  
Aerobic Granular Sludge ◽  
Reactor Performance ◽  
Capillary Suction ◽  
The Impact

Abstract A lab-scale sequencing batch reactor was operated for approximately 300 days, divided into four periods based on the feeding strategy, to develop stable aerobic granular sludge (AGS) while treating chocolate processing wastewater. Application of a prolonged mixed anaerobic feeding was not sufficient to develop AGS and reach stable reactor performance. Through the application of a partially non-mixed and a partially mixed feeding strategy, the reactor performance was increased and stable AGS formation was established characterized by low diluted sludge volume index (D)SVI DSVI10,30) values of 78 ± 27 mL·g−1 and 52 ± 17 mL·g−1, respectively, and a capillary suction time/mixed liquor suspended solid value of 0.9 sec·(g·L−1)−1. The membrane bioreactor (MBR) filtration tests showed a reduction of the fouling rate (FR) and an increase of the sustainable flux (SF0.5) for AGS compared to flocs treating the same industrial wastewater. The SF0.5 (FR > 0.5 mbar·min−1) for the flocs was 10 L·(m2·h)−1 while for AGS the SF0.5 is higher than 45 L·(m2·h)−1 because the FR did not exceed 0.1 mbar·min−1. Additionally, the AGS showed reduced irreversible fouling tendencies due to pore blocking. Our results underline the need for an increased substrate gradient during anaerobic feeding for the development and long-term maintenance of AGS under minimum wash-out conditions. The AGS–MBR filtration performance also shows strong advantages compared to a floccular MBR system due to a high increase of the SF0.5 and reduced reversible and irreversible fouling.

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