Enhancement of Sedimentation Velocity of Heavy Metals Loaded Hydroxyapatite Using Chitosan Extracted from Shrimp Waste

Kadouche, Slimane; Lounici, H.; Benaoumeur, Kacem; Drouiche, Nadjib; Hadioui, Madjid; Sharrock, Patrick

doi:10.1007/s10924-012-0440-7

Cited by 46 publications

(11 citation statements)

References 26 publications

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“…It has been shown that synthesis of chitinases is also induced under abiotic stress conditions, such as drought, salinity, the presence of heavy metals (Kasprzewska 2003 ) and osmotic stress (Grover 2012 ). Kadouche et al ( 2012 ) have demonstrated that chitosan can facilitate the ecological removal of heavy metals. When applied in a suspension containing also hydroxyapatite and metals, chitosan acts as flocculant and accelerates the sedimentation process.…”

Section: Discussionmentioning

confidence: 99%

Levofloxacin is phytotoxic and modifies the protein profile of lupin seedlings

Orzoł

Piotrowicz-Cieślak

2017

Environ Sci Pollut Res

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The toxicity of levofloxacin to yellow lupin plants was evaluated in this study. Recommended indexes of plant (roots and shoots) growth were determined and new indexes were proposed which better characterise the phytotoxicity of levofloxacin. These were, in particular, the activity of antioxidative enzymes, the content of free radicals, as well as the root protein content and the root protein profile. The results showed that levofloxacin considerably affected EC50, measured as the activity of catalase in roots, and leaves (1.05 and 0.069 mM, respectively). The activity of peroxidase in the roots and the dry weight of seedlings were the least sensitive parameters (EC50 was 1.8 and 1.76 mM, respectively). Units of toxicity clearly showed that the activity of catalase is a better measure of toxicity for low concentrations of the drug, and it is a better index of plant physiological state than the morphological parameters of seedlings. Moreover, levofloxacin changed the location of free radicals and the protein profile in plants. The changes in location of reactive oxygen species in roots were an important symptom of the drug toxicity to lupin seedlings. Our results have shown that the toxicity of levofloxacin was manifested mainly by changes in the protein profile. The content of the glyceraldehyde-3-phosphate dehydrogenase, 14-3-3-like protein A, expansin-B3-like precursor, fructose-bisphosphate aldolase, lipoxygenase, nucleotide-binding subunit of vacuolar ATPase and pyruvate dehydrogenase were found to decrease. On the other hand, plant exposure to levofloxacin resulted in an increase in the content of enolase, protein LlR18A, class III chitinase, ascorbate peroxidase, aspartate aminotransferase, alcohol dehydrogenase 1, leghemoglobin reductase-like 17 and heat shock cognate protein 80-like.

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Section: Discussionmentioning

confidence: 99%

Levofloxacin is phytotoxic and modifies the protein profile of lupin seedlings

Orzoł

Piotrowicz-Cieślak

2017

Environ Sci Pollut Res

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“…Recent investigations have reported on many successful utilization of plant extract as natural coagulant especially in areas where abundant bioresources can be obtained. Among the most studied plant based coagulant are Moringa oleifera [8,9], Cactus [10][11][12], Tannin [13,14], Chitosan [15][16][17], Guar Gum [18,19], and Jatropha curcas [2,20]. Table 1 gives an overview of several natural coagulant and related information.…”

Section: Introductionmentioning

confidence: 99%

Coagulative Behaviour of Jatropha curcas and its Performance in Wastewater Treatment

Abidin

Madehi

Yunus

2017

Env Prog and Sustain Energy

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Alternative natural coagulants from Jatropha curcas seed and press cake were investigated for coagulative behaviors and abilities to treat real wastewater. The characterization of the seed and press cake was done by proximate analysis while characterization on extracts which contain the active coagulant agent was conducted using FTIR, amino acid analysis, and zeta potential. The coagulation performance was evaluated using Jar Floc test on palm oil mill effluent. Proximate analysis indicated that Jatropha seed contained more protein (54%) than press cake (28%). Through HPLC analysis, 18 types of amino acid were detected in Jatropha curcas (JC) seed and press cake extracts. FTIR results confirmed the functional groups that existed in all the amino acids. The zeta potential of the extracts was positive at pH < 3 and became negative as pH increased. This means that the bio‐coagulant possessed net positive and negative charge at pH < 3 and pH > 4, respectively. Hence, the mechanism of coagulation at pH < 3 is due to adsorption and neutralization whereas at pH > 4, adsorption and interparticle bridging dominates. Dosages of 140 mg L−1 of Jatropha seed and 120 mg L−1 of press cake were required to treat 3500 NTU of POME to give 99 and 93% turbidity removal, respectively. Jatropha seed gave maximum turbidity removal at pH 3, while press cake at pH 2. The final pH of the treated POME was not altered greatly and the sludge produced was lesser in comparison to alum. In conclusion, the protein was the compound responsible for Jatropha coagulating behavior and its ability to treat real wastewater is promising. © 2017 American Institute of Chemical Engineers Environ Prog, 36: 1709–1718, 2017

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“…Flocculants were prepared as 1% (w/v) solutions before addition to wastewater. Chitosan was dissolved by mixing for 12 h in 1% acetic acid (Kadouche et al, 2012), starch was dissolved in water by mixing for 30 min at 80°C (Vandamme et al, 2009), and guar gum was dissolved in water at room temperature.…”

Section: Methodsmentioning

confidence: 99%

Combined Precipitation/Flocculation Method for Nutrient Recovery from Greenhouse Wastewater

Dunets¹,

Zheng²

2015

horts

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Phosphorus (P) pollution from greenhouse wastewater is currently a major issue. A treatment method that can efficiently remove P concentrations ([P]) that fluctuate between greenhouse systems and throughout the year is required. An ideal method would also recover nutrients in a reuseable form. A combined precipitation/ flocculation process incorporating addition of lime and a biodegradable flocculant (guar gum, cationic starch, or chitosan) was investigated for providing optimized P removal and recovery. Effectiveness of this process was evaluated in simulated wastewater of low and high alkalinity, as well as real greenhouse wastewater. Precipitation via lime addition reduced total P to below 1 mg · L L1 in low-alkalinity simulated wastewater, but high alkalinity slightly inhibited separation. This inhibition was overcome by flocculation via guar gum or cationic starch addition, which improved separation efficiency and reduced separation time, although chitosan was ineffective as a flocculant. The precipitation/ flocculation method was found to be effective for treating real greenhouse wastewater, although effectiveness varied with variation in wastewater composition. Recovered precipitate contained 57.4 g · kg L1 P as well as high levels of Ca, Mg, K, Fe, and Zn. This study demonstrates a P separation process incorporating lime and biodegradable flocculants could provide a means of reducing P in greenhouse wastewater below a 1 mg · L L1 regulatory limit in a settling time of less than 30 minutes, while simultaneously recovering P and other nutrients in a form that could be reused as fertilizer. An evaluation of viability of full-scale application of this technology is now warranted.

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Enhancement of Sedimentation Velocity of Heavy Metals Loaded Hydroxyapatite Using Chitosan Extracted from Shrimp Waste

Cited by 46 publications

References 26 publications

Levofloxacin is phytotoxic and modifies the protein profile of lupin seedlings

Levofloxacin is phytotoxic and modifies the protein profile of lupin seedlings

Coagulative Behaviour of Jatropha curcas and its Performance in Wastewater Treatment

Combined Precipitation/Flocculation Method for Nutrient Recovery from Greenhouse Wastewater

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