Enhanced removal of phosphate from aqueous solution using Mg/Fe modified biochar derived from excess activated sludge: removal mechanism and environmental risk

An anionic biosorbent was derived from an industrial fermentation biowate, Corynebacterium glutamicum, by being cross-linked with polyethylenimine (PEI). A fiber form of the biosorbent was used to examine its potentiality of removing anionic metals such as As (V), Cr (VI) and Mn (VII) in aqueous system. As (V) and Cr (VI) were efficiently removed by the biosorbent through anionic adsorption mechanism. Sulfate ion seriously inhibited adsorption of the anionic metals through competitive inhibition with respect to the binding site of the biosorbent. In the case of Mn (VII), its removal mechanism by the biosorbent was not anionic adsorption. Mn (VII) was completely removed in aqueous phase, meanwhile, Mn (II) appeared and increased in proportion to the Mn (VII) depletion. As a result, adsorption coupled reduction was chosen as the mechanism of Mn (VII) removal by the biosorbent. In conclusion, the anionic biosorbent could be used to remove various anionic metals from aqueous solution through anionic adsorption or reduction mechanism.

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Removal Mechanism of Organic Matter in Conventional Activated Sludge Process

Japanese Journal of Water Treatment Biology ◽

10.2521/jswtb.51.49 ◽

2015 ◽

Vol 51 (3) ◽

pp. 49-59

Author(s):

KAZUHISA MIMURA ◽

HIROSHI DEGUCHI ◽

MINGXING LIU

Keyword(s):

Organic Matter ◽

Activated Sludge ◽

Activated Sludge Process ◽

Removal Mechanism ◽

Conventional Activated Sludge ◽

Conventional Activated Sludge Process

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Adsorption of cadmium and lead from aqueous solution using modified biochar: A review

Journal of Environmental Chemical Engineering ◽

10.1016/j.jece.2021.106502 ◽

2021 ◽

pp. 106502

Author(s):

Tianqi Liu ◽

Yelly Lawluvy ◽

Yang Shi ◽

Joshua O. Ighalo ◽

Yide He ◽

...

Keyword(s):

Aqueous Solution ◽

Modified Biochar ◽

Cadmium And Lead

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Enhanced phosphate sequestration by Fe(iii) modified biochar derived from coconut shell

RSC Advances ◽

10.1039/c8ra10400j ◽

2019 ◽

Vol 9 (18) ◽

pp. 10425-10436 ◽

Cited By ~ 7

Author(s):

Zhenxing Zhong ◽

Guowen Yu ◽

Wenting Mo ◽

Chunjie Zhang ◽

Hao Huang ◽

...

Keyword(s):

Aqueous Solution ◽

Coconut Shell ◽

Modified Biochar ◽

Coconut Shell Biochar

In this work, a novel Fe-modified coconut shell biochar (Fe-CSB) was synthesized and utilized to remove phosphate from aqueous solution.

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Treatment of organic chlorine in pulping effluents by activated sludge

Water Science & Technology ◽

10.2166/wst.1999.0057 ◽

1999 ◽

Vol 40 (1) ◽

pp. 275-279 ◽

Cited By ~ 2

Author(s):

G. (Goktayoglu) Demirbas ◽

C. F. Gokcay ◽

F. B. Dilek

Keyword(s):

Carbon Source ◽

Activated Sludge ◽

Treatment Plant ◽

Organic Content ◽

Domestic Sewage ◽

Municipal Sewage ◽

Removal Mechanism ◽

Start Up ◽

Organic Chlorine ◽

Aox Removal

A model activated sludge (AS) plant was fed by pulping effluents from a straw and reed processing paper works. The model was initially operated to simulate a dedicated treatment plant by continuously receiving chlorinated effluents from the pulp bleachery. In this simulation cycle the model activated sludge was seeded only once during start-up and did not receive any domestic sewage after that. A carbon source was added in some of the experiments to bring up the organic content. In the second simulation cycle the pulping effluent was co-treated with municipal sewage. In this case the activated sludge unit was being continuously dosed by microorganisms and the organics present in the sewage. A higher organic chlorine (AOX) removal was obtained at shorter SRTs in the co-treatment AS. High AOX removal was achieved at longer SRTs in the dedicated, once-seeded AS. The AOX removal mechanism was mineralization in both cycles.

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Simultaneous removal of Cd(II) and As(III) from co-contaminated aqueous solution by α-FeOOH modified biochar

Biochar ◽

10.1007/s42773-020-00040-8 ◽

2020 ◽

Vol 2 (1) ◽

pp. 81-92 ◽

Cited By ~ 4

Author(s):

Sihang Zhu ◽

Ting Qu ◽

Muhammad Kashif Irshad ◽

Jianying Shang

Keyword(s):

Aqueous Solution ◽

Simultaneous Removal ◽

Modified Biochar

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Efficient Removal of Diclofenac from Aqueous Solution by Potassium Ferrate-Activated Porous Graphitic Biochar: Ambient Condition Influences and Adsorption Mechanism

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph17010291 ◽

2019 ◽

Vol 17 (1) ◽

pp. 291 ◽

Cited By ~ 6

Author(s):

Nguyen Thi Minh Tam ◽

Yunguo Liu ◽

Hassan Bashir ◽

Zhihong Yin ◽

Yuan He ◽

...

Keyword(s):

Aqueous Solution ◽

Adsorption Capacity ◽

Diclofenac Sodium ◽

Maximum Adsorption Capacity ◽

Potassium Ferrate ◽

Solution Ph ◽

Modified Biochar ◽

Prepared Material ◽

Endothermic Process ◽

One Step

Porous graphitic biochar was synthesized by one-step treatment biomass using potassium ferrate (K2FeO4) as activator for both carbonization and graphitization processes. The modified biochar (Fe@BC) was applied for the removal of diclofenac sodium (DCF) in an aqueous solution. The as-prepared material possesses a well-developed micro/mesoporous and graphitic structure, which can strengthen its adsorption capacity towards DCF. The experimental results indicated that the maximum adsorption capacity (qmax) of Fe@BC for DCF obtained from Langmuir isotherm simulation was 123.45 mg·L−1 and it was a remarkable value of DCF adsorption in comparison with that of other biomass-based adsorbents previously reported. Thermodynamic quality and effect of ionic strength studies demonstrated that the adsorption was a endothermic process, and higher environmental temperatures may be more favorable for the uptake of DCF onto Fe@BC surface; however, the presence of NaCl in the solution slightly obstructed DCF adsorption. Adsorption capacity was found to be decreased with the increase of solution pH. Additionally, the possible mechanism of the DCF adsorption process on Fe@BC may involve chemical adsorption with the presence of H-bonding and π–π interaction. With high adsorption capacity and reusability, Fe@BC was found to be a promising absorbent for DCF removal from water as well as for water purification applications.

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