Cadmium Removal from Marine Sediment by Rhamnolipid Biosurfactant

2014 ◽  
Vol 556-562 ◽  
pp. 641-644
Author(s):  
Mei Liu ◽  
Qing Guo Chen ◽  
Li Shao ◽  
Jing Ya Sun ◽  
Zhen Ying Rong
Keyword(s):  
Removal Efficiency ◽  
Marine Sediment ◽  
Laboratory Scale ◽  
Cadmium Removal ◽  
Cadmium Absorption ◽  
Rhamnolipid Biosurfactant

The cadmium removed from sediment by rhamnolipid biosurfactant was explored in laboratory scale. The results suggest that the biosurfactant can remove cadmium from the sediment efficiently, 40% more than SDS. 200 mg/L rhamnolipid biosurfactant can get 84.02% cadmium removal efficiency from the sediment which contained 0.42 mg/g cadmium. pH affect cadmium removal by rhamnolipid, the best pH was 10. Leaching could also affect cadmium removal, there was a remarkable increasing of cadmium removal efficiency after the second washing, and after 48 h leaching cadmium removal and cadmium absorption got the balance.

The Applications of Natural Zeolites for Cadmium Removal from Sample Water: Models on Laboratory Scale

2011 ◽  
Vol 347-353 ◽  
pp. 1930-1933 ◽  
Author(s):  
Usa Onthong ◽  
Pornpan Pungpo ◽  
Wikanda Thongnueakhaeng
Keyword(s):  
Removal Efficiency ◽  
Low Cost ◽  
Experimental Models ◽  
Laboratory Scale ◽  
Natural Zeolites ◽  
Cadmium Removal ◽  
Adsorption Parameters ◽  
Effective Removal ◽  
Sample Water ◽  
Preliminary Study

The removal of the cadmium ion from aqueous solution was studied in batch experiments using five natural zeolites were obtained from South of Thailnd, Clinoptiolite, Mordenite, Willhensonite, Offretite and Ferrierite, on the basis of experimental models on laboratory scale. Clinoptiolite was used for preliminary study of the adsorption parameters. An hour contact time and 40 g/L of the ratio of zeolite per water sample are optimum adsorption parameters with an average cadmium removal efficiency of 91.68 %. The optimum adsorption conditions were then used for other four natural zeolites. The results show that the effective removal sequence can be listed as Offretite  Clinoptiolite > Willhensonite > Mordenite > Ferrierite. Clinoptiolite, Offretite and Willhensonite are successfully used to reduce significantly cadmium from sample water with removal efficiency ranging from of 87-92%, respectively. Accordingly, the natural zeolites are recommendable adsorbents for highly cadmium removal of industrial wastewater with low cost of wastewater treatments and environmentally friendly chemical processes.

Influence of the redox condition dynamics on the removal efficiency of a laboratory-scale constructed wetland

2005 ◽  
Vol 39 (1) ◽  
pp. 248-256 ◽  
Author(s):  
A. Wießner ◽  
U. Kappelmeyer ◽  
P. Kuschk ◽  
M. Kästner
Keyword(s):  
Removal Efficiency ◽  
Constructed Wetland ◽  
Laboratory Scale ◽  
Redox Condition

scholarly journals Reuse of treated wastewater using sequencing batch bioreactor for the improvement of wheat growth

2011 ◽  
Vol 1 (3) ◽  
pp. 179-184 ◽  
Author(s):  
Beenish Saba ◽  
Tariq Mahmood ◽  
Bushra Zaman ◽  
Imran Hashmi
Keyword(s):  
Removal Efficiency ◽  
Growth Parameters ◽  
Wheat Variety ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Laboratory Scale ◽  
Treated Wastewater ◽  
Reclaimed Wastewater ◽  
Attached Growth ◽  
Batch Bioreactor

Reclaimed wastewater reuse for irrigation to crop plants is evaluated in a laboratory-scale experiment to assess growth and water saving potential from natural resources. A prototype laboratory-scale treatment plant was established for this purpose with suspended and attached growth configurations. Chakwal wheat variety was selected to examine growth parameters. The removal of chemical oxygen demand (COD), total nitrogen (TN) and total phosphorus (TP) were evaluated to check the quality of treated water. It was found that a suspended growth sequencing batch bioreactor (SGSBBR) achieved 97% ± 2 removal efficiency over a 4 h hydraulic retention time (HRT). For an attached growth sequencing batch bioreactor (AGSBBR) results showed 98% ± 2 removal efficiencies with polyurethane. TN and TP removal efficiency was 58.7 ± 3% and 64 ± 4.8% in SGSBBR, 53 ± 0.17% and 67 ± 2.7% in polyurethane. AGSBBR enhanced performance with AGSBBR may be due to enforced anoxic/aerobic conditions in the inner layers of biofilm formed on biocarriers which facilitate the required metabolic conditions for treating high strength wastewater. Plant growth was visibly greater in SGSBBR treated wastewater than AGSBBR because of less nutrient removal.

Increasing nitrogen removal efficiency by intermittent aeration in partial areas of laboratory-scale vertical flow constructed wetlands

2020 ◽  
Vol 71 (12) ◽  
pp. 1686
Author(s):  
Chen Chen ◽  
Nannan Zhang ◽  
Zhe Liu ◽  
Shuqing An ◽  
Dehua Zhao
Keyword(s):  
Removal Efficiency ◽  
Constructed Wetlands ◽  
Nitrogen Removal ◽  
Amoa Gene ◽  
Laboratory Scale ◽  
Vertical Flow ◽  
Intermittent Aeration ◽  
Nitrate Reductase Gene ◽  
Partial Area ◽  
Reductase Gene

Intermittent aeration (IA) has been widely used in constructed wetlands (CWs) because it is economical and results in high nitrogen removal efficiency (RE). The aim of this study was to identify whether IA (4hday–1; the recommended frequency according to previous studies) in a partial area (PIA) can improve nitrogen RE compared with IA applied throughout the CW (TIA). Three types of laboratory-scale vertical flow CWs were constructed: PIA, TIA and non-aerated (NA). PIA achieved a higher RE of total nitrogen than TIA and NA (mean RE 60.6 v. 45.2 and 37.4% respectively). In the PIA, the ammonia mono-oxygenase subunit A (amoA) gene was abundant in aerated areas, whereas the nitrate reductase gene narG and nitrite reductase genes nirK and nirS were abundant in anaerobic areas. The results of this study suggest that PIA is an effective strategy for nitrogen removal when applying aeration in CWs because it preserves a constant anaerobic area for denitrification.

Effect of reflux ratio on COD and nitrogen removals from coke plant wastewaters

2010 ◽  
Vol 61 (12) ◽  
pp. 3017-3025 ◽  
Author(s):  
X. L. Shi ◽  
X. B. Hu ◽  
Z. Wang ◽  
L. L. Ding ◽  
H. Q. Ren
Keyword(s):  
Removal Efficiency ◽  
Significant Influence ◽  
Coke Plant ◽  
Biofilm Reactor ◽  
Laboratory Scale ◽  
Reflux Ratio ◽  
Moving Bed Biofilm Reactor ◽  
Moving Bed ◽  
N Removal ◽  
Removal Efficiencies

A laboratory-scale anaerobic-anoxic-aerobic-moving bed biofilm reactor (A1-A2-O-MBBR) system was undertaken to treat coke plant wastewaters from two different factories (wastewater A and B). Wastewater B had higher BOD5/COD ratio and COD/TN ratio than wastewater A. The effects of reflux ratios on COD, TN and NH3-N removals were studied. Results indicated that, with the reflux ratio increased from 2 to 5, COD removals of wastewater A and wastewater B increased from 57.4% to 72.6% and 78.2% to 88.6%, respectively. Meanwhile, TN removals were also increased accompanying reflux ratio rise, from 53.1% to 74.4% for wastewater A and 64.2% to 83.5% for wastewater B. At the same reflux ratio, compared with wastewater A, higher COD and TN removal efficiencies were observed in wastewater B, which had higher BOD5/COD and COD/TN ratio. Reflux ratio had no significant influence on NH3-N removal; 99.0% of the overall NH3-N removal efficiency was achieved by the system for both coke plant wastewaters at any tested reflux ratio. MBBR was effective in NH3-N removal, and about 95% of the NH3-N was removed in the MBBR.

Prediction of the continuous cadmium removal efficiency from aqueous solution by the packed-bed column using GMDH and ANFIS models

2021 ◽  
Vol 234 ◽  
pp. 91-101
Author(s):  
Ali Asghar Behroozpour ◽  
Dariush Jafari ◽  
Morteza Esfandyari ◽  
Seyed Ali Jafari
Keyword(s):  
Aqueous Solution ◽  
Removal Efficiency ◽  
Packed Bed ◽  
Cadmium Removal ◽  
Packed Bed Column

Chaetomorpha linum in the bioremediation of aquaculture wastewater: Optimization of nutrient removal efficiency at the laboratory scale

Aquaculture ◽  
2020 ◽  
Vol 523 ◽  
pp. 735133 ◽  
Author(s):  
Francesca Aquilino ◽  
Annalisa Paradiso ◽  
Roberta Trani ◽  
Caterina Longo ◽  
Cataldo Pierri ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Nutrient Removal ◽  
Laboratory Scale ◽  
Nutrient Removal Efficiency ◽  
Aquaculture Wastewater ◽  
Chaetomorpha Linum

scholarly journals Estimation of hydrogen sulfide removal efficiency with granulated coal ash applied to eutrophic marine sediment using a simplified simulation model

2015 ◽  
Vol 94 (1-2) ◽  
pp. 55-61 ◽  
Author(s):  
Satoshi Asaoka ◽  
Tamiji Yamamoto ◽  
Hironori Yamamoto ◽  
Hideo Okamura ◽  
Kazutoshi Hino ◽  
...  
Keyword(s):  
Hydrogen Sulfide ◽  
Simulation Model ◽  
Removal Efficiency ◽  
Marine Sediment ◽  
Coal Ash ◽  
Sulfide Removal ◽  
Hydrogen Sulfide Removal

Removal and fate of estrogens in an anaerobic-anoxic-oxic activated sludge system

2011 ◽  
Vol 63 (1) ◽  
pp. 51-56 ◽  
Author(s):  
Y. M. Li ◽  
Q. L. Zeng ◽  
S. J. Yang
Keyword(s):  
Activated Sludge ◽  
Removal Efficiency ◽  
Laboratory Scale ◽  
Dominant Mechanism ◽  
Waste Sludge ◽  
Activated Sludge System ◽  
17Β Estradiol ◽  
Solid Phases ◽  
Final Effluent

Laboratory-scale experiments were conducted to investigate the removal and fate of estrogens 17β-estradiol (E2) and 17α-ethinylestradiol (EE2) in an anaerobic-anoxic-oxic (AAO) activated sludge system. Estrogen concentrations in the aqueous and solid phases in each reactor of AAO system were analyzed separately. E2 was not detected in the final effluent. The anaerobic, anoxic and oxic reactors accounted for 71%, 7% and 22% of the overall E2 removal, respectively. The overall EE2 removal efficiency was about 80%, and the anaerobic, anoxic and oxic reactors were responsible for 44%, 8% and 48% of the overall EE2 removal, respectively. In anaerobic unit, sorption was the dominant mechanism for the removal of E2 and EE2. While E2 was degraded in all the three units of the AAO system, EE2 was only degraded in the anoxic and aerobic units. Biodegradation is important for the fate of E2 compared to sorption. Of the total influent E2 in the AAO system, 99.99% was biodegraded and 0.01% remained in the waste sludge. Nevertheless, both sorption and biodegradation play important roles in the removal of EE2. Of the total influent EE2, 79.1% was degraded by activated sludge, 19.9% was discharged in the effluent and 1% remained in the waste sludge.

scholarly journals LABORATORY STUDY ON THE OPTIMIZATION OF IPLT SUMUR BATU DEWATERING UNIT USING DIFFERENT COAGULANTS

2019 ◽  
Vol 2 (2) ◽  
pp. 134
Author(s):  
Sandra Madonna ◽  
Sirin Fairus ◽  
Nadya Nurul Amelinda
Keyword(s):  
Removal Efficiency ◽  
Laboratory Study ◽  
Treatment Plant ◽  
Laboratory Scale ◽  
Test Method ◽  
Impact Study ◽  
Jar Test ◽  
Varied Concentration

<p><strong>Aim:</strong> The aim of this study is to determine the most effective type and concentration of coagulant to reduce TDS, TSS, BOD and COD Sumur Batu Fecal Treatment Plant or <em>Instalasi Pengolahan Lumpur Tinja</em> (IPLT) Sumur Batu. <strong>Methodology and Results</strong>: Using the jar test method at a laboratory scale, the types of coagulants of PAC, Alum and FeSO4 with varied concentration of 70 mg/L, 137.5 mg/L and 200 mg/L were used. Additionally, Polyacrylamide was also used in the study with concentration varied between 0.1 mg/L, 0.6 mg/L, and 1.1 mg/L adjusted to the concentration in the field. <strong>Conclusion, significance and impact study: </strong>Results showed that Alum with a concentration of  200 mg/L was the most effective coagulant, with removal efficiency for each parameter is as follows TDS = 82.17%, TSS = 67.69%, BOD = 60.16%, and COD = 59.76%.</p>

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