Biotic and abiotic bisphenol-A removal from wastewater by activated sludge: effects of temperature, biomass, and bisphenol-A concentrations

2015 ◽  
Vol 73 (2) ◽  
pp. 317-328 ◽  
Author(s):  
Olcayto Keskinkan ◽  
Behzat Balci
Keyword(s):  
Bisphenol A ◽  
Activated Sludge ◽  
High Performance ◽  
Oxygen Demand ◽  
Kinetic Studies ◽  
Control Groups ◽  
Reaction Rate Constants ◽  
Activated Sludge System ◽  
Bpa Removal ◽  
And Control

In this study, bisphenol-A (BPA) removal from synthetic wastewaters using a laboratory-scale activated sludge system was achieved. Activated (biotic) sludge was used for BPA elimination, whereas inactivated (abiotic) sludge was used during the adsorption study. In each step, six different BPA concentrations (5, 10, 20, 30, 40, and 50 mg L−1) were tested, and temperatures were set to 10, 20, and 30 °C in the shakers. Four different activated sludge concentrations (1,000, 2,000, 3,000, and 4,000 mgTSS L−1) were applied in the biotic study, and only 2,000 mgTSS L−1 was used in the abiotic study. After settlement of the sludge in the shakers, supernatants and control groups were filtered and analyzed for BPA using high performance liquid chromatography. In the biotic study, BPA and chemical oxygen demand (COD) concentrations were reduced at 100% and 99% levels, respectively. However, the BPA concentrations during the abiotic study changed slightly at varying temperatures, whereas there was no change of BPA concentration observed in the control groups. Results indicate that the main factor of BPA removal in an activated sludge system is biological. Kinetic studies were also conducted. BPA removal was best fit to zero- and first-order reaction kinetics, and the reaction rate constants are provided in this paper.

Removal of Bisphenol-A from Aqueous Solutions by Pseudomonas aeruginosa in Batch Reactors: Effect of Carbon Source, Temperature and Concentrations

2018 ◽  
Vol 16 (6) ◽  
Author(s):  
Olcayto Keskinkan ◽  
Behzat Balci
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Carbon Source ◽  
Bisphenol A ◽  
High Performance ◽  
Synthetic Wastewater ◽  
Second Step ◽  
Batch Reactors ◽  
Control Groups ◽  
Bpa Removal ◽  
And Control

AbstractThis study was carried out to investigate the potential ofPseudomonas aeruginosafor the removal of bisphenol-A (BPA) from synthetic wastewater. To achieve this, BPA removal capability ofP. aeruginosawith respect to BPA concentration, and temperature were examined in batch reactors. Experiments were conducted in the presence/absence of glucose, as a carbon source. The first set of experiments consisted of evaluating the kinetic of removal of BPA at different concentrations (5, 10, 20, and 30 mg BPA/L) without glucose. In the second set of experiments, three different glucose concentrations (0.5, 1.0, and 2.0 glucose/L) with BPA concentrations were tested. After settlement of theP. aeruginosabiomass in the shakers, supernatants and control groups were filtered and analyzed for BPA using high performance liquid chromatography. In the biotic study, BPA removal rates were between 63 % and 100 %. All concentrations of BPA under 20 mg/L were completely degraded at 25 and 35 ºC at first step. However, 30 mgBPA/L was decreased to 8.56 mg/L byP. aeruginosaat first step at 25 ºC. At the second step, all concentrations of BPA were completely degraded by the cells at the presence of glucose. Hence, it can be summarized that bisphenol A can be used byP. aeruginosaas an external carbon source in the wastewater environments.

scholarly journals Biofloc production in activated sludge system treating shrimp farming effluent

2018 ◽  
Vol 23 (6) ◽  
pp. 1143-1152 ◽  
Author(s):  
Sandra Tedde Santaella ◽  
Maria do Socorro Vale ◽  
Clara Cabral Almeida ◽  
Willame de Araújo Cavalcante ◽  
Alberto Jorge Pinto Nunes ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Oxygen Demand ◽  
Shrimp Farming ◽  
Effluent Treatment ◽  
Nitrogen Compounds ◽  
Suitable Alternative ◽  
Activated Sludge System ◽  
Feed Cost ◽  
Shrimp Feed ◽  
Farming Industry

ABSTRACT The release of wastewater and the shrimp feed cost are the main challenges faced by the shrimp farming industry. An alternative solution to both problems is biofloc production in a unit external to the farm, in an activated sludge system for effluent treatment. The treatment system’s influent was composed of the shrimp farm wastewater supplemented with urea and sugarcane molasses. The results show that the average removal of chemical oxygen demand was 71% and the average biofloc production in the reactor was approximately 1.5g.L-1. Adding molasses to the influent contributed to the increase in the quantity and diversity of existing microorganisms that are beneficial to cultured shrimp. The mass balance of nitrogen compounds confirmed that nitrification occurred in the system. Therefore, the use of the activated sludge system is a viable and environmentally suitable alternative to produce bioflocs and shrimp farming effluent treatment.

Reduction of chemical oxygen demand in a conventional activated sludge system treating coke oven wastewater

2020 ◽  
Vol 273 ◽  
pp. 122482 ◽  
Author(s):  
Viktória Pitás ◽  
Viola Somogyi ◽  
Árpád Kárpáti ◽  
Péter Thury ◽  
Tamás Fráter
Keyword(s):  
Activated Sludge ◽  
Chemical Oxygen Demand ◽  
Oxygen Demand ◽  
Coke Oven ◽  
Conventional Activated Sludge ◽  
Activated Sludge System

scholarly journals Performance of Novel Contact Stabilization Activated Sludge System on Domestic Wastewater Treatment

2015 ◽  
Vol 19 (2) ◽  
pp. 7
Author(s):  
Andrés Felipe Torres Franco ◽  
Nancy Vásquez Sarria ◽  
Jenny Rodriguez Victoria
Keyword(s):  
Activated Sludge ◽  
Oxygen Demand ◽  
Domestic Wastewater ◽  
Growth Zone ◽  
Pilot Scale ◽  
Ammonia Nitrogen ◽  
Activated Sludge System ◽  
Suspended Growth ◽  
Removal Efficiencies ◽  
Final Effluent

A pilot-scale study was conducted to evaluate a traditional contact stabilization activated sludge system (CSASC) and a modified CSAS (CSASM) treating domestic wastewater. The CSASC system was comprised of a contact reactor (CR), a stabilization reactor (SR) and a secondary settler (SS); the CSASM included a second CR, a second SS (CR2 and SS2), and a modified SR (SRM) divided into four zones: an attached-suspended growth zone which allowed the system to reach an average sludge retention time close to 36 d and favored the occurrence of nitrification; an anoxic zone for denitrification occurrence; an aerated suspended growth zone with a high presence of organic carbon; and an additional aerated suspended growth zone with a high ammonia concentrations environment. The CSASC’s removal efficiencies of chemical oxygen demand (COD) and total ammonia nitrogen (TAN) were respectively 94±4 % and 53±12%; whereas CSASM’s efficiencies were 88±7% for COD and 92±7% for TAN. Concentrations of TAN and NO3 --N in the CSASC’s final effluent were 14.3±5.2 and 5.0±2.9 mg×L-1; and 4.8±4.4 and 9.1±5.8 mg×L-1 in the CSASM’s final effluent. Results demonstrated that the proposed configuration obtained higher nitrogen removal efficiencies than traditional CSAS.</p>

Adaptation of microbial communities in activated sludge to 1-decyl-3-methylimidazolium bromide

2016 ◽  
Vol 74 (5) ◽  
pp. 1227-1234 ◽  
Author(s):  
Dorota Gendaszewska ◽  
Ewa Liwarska-Bizukojc
Keyword(s):  
Activated Sludge ◽  
Oxygen Demand ◽  
Biotic Index ◽  
Activated Sludge Process ◽  
Control Test ◽  
Chemical Oxygen Demand Removal ◽  
Microbial Composition ◽  
Mean Values ◽  
Activated Sludge System ◽  
High Level

The effects of 1-decyl-3-methylimidazolium bromide on activated sludge process and microbial composition were investigated. Ionic liquid (IL) was dosed continuously to the laboratory activated sludge system at an influent concentration from 1 to 20 mg l−1 for about 1 month. As compared to the control test, mean values of degree of chemical oxygen demand removal and degree of biochemical oxygen demand removal were almost remaining constant at a high level, equaling 92.6% and 98.1%, respectively. In addition, no influence of IL on size and shape of flocs was observed. The values of the sludge biotic index indicate that sludge exposed on IL was stable and very well colonized with good biological activity. Increases in Proteobacteria (mainly Variovorax sp., Vogesella sp., Hydrogenophaga sp.), Bacteroidetes (mainly Lewinella sp., Haliscomenobacter sp., Runella sp.) and Nitrospirae were detected in sludge adapted to IL compared to the control system. The results showed that activated sludge can adapt to IL present in wastewater.

The Relationship between SOUR and some Process Parameters in Activated Sludge System

2012 ◽  
Vol 462 ◽  
pp. 169-172 ◽  
Author(s):  
Xue Feng Wang ◽  
Yu Gui Jia ◽  
Dan Li
Keyword(s):  
Biological Activity ◽  
Activated Sludge ◽  
Oxygen Uptake Rate ◽  
Control Parameters ◽  
Activated Sludge System ◽  
Pollutant Concentrations ◽  
The Status ◽  
Specific Oxygen Uptake Rate ◽  
And Control ◽  
The Relationship

Specific oxygen uptake rate (SOUR), which reveals the status of activated sludge physiology and substrate metabolism by detecting respiration rate of microorganisms, is an important parameter reflecting the biological activity of activated sludge. Through the measurement of SOUR in SBR system, the SOUR variation and the correlation between SOUR and pollutant concentrations and control parameters in SBR process were studied. The result showed that SOUR can effectively reflect the biochemical reaction course of SBR process. There was better correlation between the SOUR and DO, ORP and pH in SBR process.

Denitrification of nitrate-contaminated groundwater using a simple immobilized activated sludge bioreactor

2012 ◽  
Vol 66 (3) ◽  
pp. 517-524 ◽  
Author(s):  
Zhengfang Ye ◽  
Feng Wang ◽  
Haitao Bi ◽  
Zhongyou Wang ◽  
Guo-hua Liu
Keyword(s):  
Activated Sludge ◽  
Oxygen Demand ◽  
Operating Conditions ◽  
Nitrite Accumulation ◽  
Activated Sludge System ◽  
N Concentration ◽  
Immobilized Microorganisms ◽  
N Loading ◽  
Anaerobic Biomass

A simple anaerobic-activated sludge system, in which microorganisms are immobilized by a novel functional carrier, was used for removing nitrate in groundwater. The operating conditions, including hydraulic retention time (HRT), C/N ratio, temperature and NO3−-N loading concentration were investigated. The NO3−-N concentration, residual chemical oxygen demand (COD) and nitrite accumulation were used as indicators to assess the water quality of the effluent. The anaerobic biomass loading capacity in the carrier was 12.8 g/L and the denitrifying Pseudomonas sp. and Rhodocyclaceae bacterium were dominant among the immobilized microorganisms in the anaerobic-activated sludge. Under operating conditions of HRT= 1.5 h, C/N= 2–3 and T= 16.8–20 °C, the removal efficiency of NO3−-N exceeded 93%, corresponding to a relatively high denitrification rate of 0.73 kg NO3−-N m−3 d−1, when the NO3−-N loading concentration was 50 mg/L. The NO3−-N concentration of the effluent always met regulatory criteria for drinking water (&lt;10 mg/L) in the main developed and developing countries. The effluent COD was also below 10 mg/L. Although some nitrite accumulated (0–1.77 mg/L) during the operating period, it can be decreased through adjusting the operating pH and HRT. The immobilized activated sludge system may be useful for the removal of nitrate from groundwater.

scholarly journals High-performance inulin and oligofructose prebiotics increase the intestinal absorption of iron in rats with iron deficiency anaemia during the growth phase

2011 ◽  
Vol 108 (6) ◽  
pp. 1008-1016 ◽  
Author(s):  
Karine de Cássia Freitas ◽  
Olga Maria Silvério Amancio ◽  
Mauro Batista de Morais
Keyword(s):  
Intestinal Absorption ◽  
High Frequency ◽  
High Performance ◽  
Fe Deficiency ◽  
Control Group ◽  
Control Groups ◽  
Deficiency Anaemia ◽  
Significant Difference ◽  
Group 2 ◽  
And Control

Considering the high frequency of anaemia due to Fe deficiency, it is important to evaluate the effects of prebiotics on the absorption of Fe. The aim of the present study was to evaluate the effects of high-performance (HP) inulin, oligofructose and synergy1 during recovery from anaemia in rats through the intestinal absorption of Fe, food intake, body growth, caecal pH and weight of the intestine. Wistar rats (n 47) were fed with rations of AIN93-G with no Fe to induce Fe deficiency anaemia. At 36 d of life, anaemic rats were divided into four groups: (1) the HP inulin group; (2) the synergy1 group; and (3) the oligofructose group, all with 100 g of the respective prebiotic per kg of ration; and (4) a control group, in which the prebiotic was replaced by maize starch. Then, 25 mg of elemental Fe/kg of ration was added to all rations to allow recovery from anaemia. The final values of Hb in the HP inulin, synergy1, oligofructose and control groups were, respectively: 98 (94–99); 83 (81–92); 100 (90–114); 77 (72–81) g/l, with a statistically significant difference (P ≤ 0·001) between the oligofructose and control groups and the HP inulin and control groups. The four groups had an increase in weight and body length and had similar consumption of rations. The intestinal weight and caecal pH were significantly different between the groups that consumed prebiotics and the control group. HP inulin and oligofructose increased the intestinal absorption of Fe in rats.

Reliability analyses of activated sludge systems in attaining effluent standards

1993 ◽  
Vol 20 (2) ◽  
pp. 171-179
Author(s):  
Mukesh Sharma ◽  
W. B. Hall ◽  
E. A. McBean
Keyword(s):  
Activated Sludge ◽  
Oxygen Demand ◽  
Point Method ◽  
Aeration Tank ◽  
Design Point ◽  
Effluent Standards ◽  
Activated Sludge System ◽  
First Order Second Moment ◽  
Key Words Reliability ◽  
Activated Sludge Processes

A design-point method, or advanced first-order second-moment technique, is used for reliability-based analyses of activated sludge processes in meeting specified effluent standards. Three non-normal random variables, namely flow, influent biochemical oxygen demand (BOD), and influent suspended solids (SS) concentrations, are utilized in evaluating the performance of the activated sludge system. Two types of failure to attain specified effluent standards are considered, namely BOD failure and SS failure. The reliability of activated sludge system is studied with respect to the volume of the aeration tank using design-point method. Key words: reliability analyses, BOD, activated sludge.

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