Toward green technology: a review on some efficient model plant-based coagulants/flocculants for freshwater and wastewater remediation

Othmani, Bouthaina; Rasteiro, Maria G.; Khadhraoui, Moncef

doi:10.1007/s10098-020-01858-3

Cited by 60 publications

(41 citation statements)

References 69 publications

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“…The conditions of experiment including the mixing rate, pH modifications, the concentration of the colloidal particles, acidity/alkalinity of the wastewater, and dosages of the organic coagulants are contributing factors toward achieving greater clarification efficiency [9,10]. The challenges of using organic coagulants still remain that fundamental background knowledge about their pH modifications, clarification efficacy, and interactions with the substrates in the water medium is often scarce, or insufficient to infer the best chemical configuration for treating a specific effluent [9,24,25,4]. These challenges have grown with the proportionate increase in their inability to satisfy the EPA pH standards for wastewater discharge.…”

Section: Supplementary Informationmentioning

confidence: 99%

Optimization studies on turbidity removal from cosmetics wastewater using aluminum sulfate and blends of fishbone

Ovuoraye

Ugonabo

Nwokocha³

2021

SN Appl. Sci.

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This research is centered on the optimization of coagulation–flocculation treatment of cosmetic wastewater. It analyzes blends of fishbone (BFB) and aluminum-based coagulant (ABC) to determine the efficacy of BFB as a potential coagulant–flocculants aid at optimum conditions using response surface methodology (RSM). The experiment was carried out employing the standard nephelometric procedure at 1000 rpm stirring rate. The central composite design (CCD) was used to examine the interactions of pH, dosage, and settling time to maximize the turbidity removal efficiency of the ABC- and BFB-driven coag–flocculation. The optimal pH, dosage, and settling time for ABC were obtained as 10, 0.1 g/L, and 2 min, while pH 6, 0.4 g/L, and settling time of 4 min were recorded for BFB following the established quadratic model of the RSM. The removal efficiency of ABC and BFB plots 80% and 88%, respectively; this corresponds to 262 NTU and 288 NTU of removal from the wastewater at optimal conditions. The kinetics result indicated that the rate constant (Kf) 3 × 10−3 (L/g min) of BFB surpassed 5 × 10−5 (L/g min) recorded for ABC following second-order coag–flocculation reaction, with correlation coefficients (R2) values of 0.999 and 0.9985, respectively. The research also applied cost–benefit analysis for the determination of the efficacy of BFB. The figure obtained shows that the benefit of using BFB will save $5.50 compared to ABC based on this work. At optimal conditions, BFB satisfied the environmental protection agency pH standard for industrial wastewater discharge, promising coagulant–flocculants aid for industrial wastewater purification purpose and the preservation of the environment.

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Section: Supplementary Informationmentioning

confidence: 99%

Optimization studies on turbidity removal from cosmetics wastewater using aluminum sulfate and blends of fishbone

Ovuoraye

Ugonabo

Nwokocha³

2021

SN Appl. Sci.

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“…Thus, several studies on water clarification with natural coagulants like Moringa seeds (Adeniran et al, 2017;Camacho et al, 2017;Hoa and Hue, 2018) or other natural coagulants (Adewuyi and Adewumi, 2018;Benalia et al, 2019;Freitas et al, 2015;Hussain and Hydar, 2019;Jayalakshmi et al, 2017) have already been carried out. Other researches have shown the efficiency of addition of Opuntia ficus-indica extracts as coagulant aids or flocculant (Adjeroud-Abdellatif et al, 2020;Bouaouine et al, 2019;Karanja et al, 2017;Othmani et al, 2020). Bouaouine et al (2019) revealed that quercetin and starch constitute the active agents found in O. ficus-indica.…”

Section: Introductionmentioning

confidence: 99%

Comparative study of the effects of Herbal and chemical Coagulants in the clarification of raw water

Konkobo¹,

Diao²,

Savadogo³

et al. 2021

Afr. J. Agric. Res.

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The use of aluminum sulphate in clarifying raw waters raises many concerns about its impact on human health. Thus, the present study was initiated to compare the effects of Moringa oleifera and aluminum sulphate besides evaluating the association between M. oleifera or aluminum sulphate with Opuntia ficus-indica or syntofloc for water treatment. The essays were carried in Jar Test using waters of 352.80 Nephelometric Turbidity Units (NTU). The monitoring of different physico-chemical and microbiological parameters at different doses and after different decanting time was used to determine optimal conditions and evaluate the effectiveness of treatment. The results showed that it took fewer doses and less decanting time for aluminum sulphate than moringa to obtain the same residual turbidity. The use of 0.9 g/L of moringa removed 99% of turbidity after 12 h of decanting. Successive use of moringa (0.9 g/L) with O. ficus-indica extract (0.6 ml) reduced the decanting time to 15 min. However, this treatment eliminated only about 57% of total coliforms. The moringa/cactus association, although highly effective, remains less than the treatment based on aluminum sulphate and synthofloc. This "organic" association is nevertheless an ideal alternative because of its great capacities that could be further optimized.

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“…Coagulation/flocculation can effectively agglomerate sludge colloids to form large flocs through charge neutralization and bridging flocculation effects, is beneficial to sludge sedimentation, filtration and permeability, and is thus one of the most commonly used sludge conditionings in practical operation 15 – 17 . The employed coagulants/flocculants are of great significance in coagulation/flocculation 18 , 19 . Given the critical roles of the microstructural characteristics of resultant sludge cakes in the sludge dewaterability as mentioned above, the ideal sludge conditioners should contain not only hydrophilic groups for improved water solubility and dispersion but also hydrophobic ones to form hydrophobic regions for well building drainage channels.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of hydrophobically associating cationic starch-based flocculants in sludge dewatering

Shen

Yang

2021

Sci Rep

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Two series of binary graft cationic starch-based flocculants (CS-DMCs and CS-DMLs) with different hydrophilicity and charge density (CD) were prepared by graft copolymerization of acrylamide with 2-(Methacryloyloxy)-N,N,N-trimethylethanaminium chloride and methacrylic acid 2-(benzyldimethylaminio) ethyl chloride, respectively, on the starch (St) backbone. The sludge dewatering performance of CS-DMCs and CS-DMLs were evaluated and compared based on the changes in filter cake moisture content (FCMC), specific resistance of filtration (SRF), fractions and components of extracellular polymeric substances, and various physiochemical characteristics of sludge flocs and cakes. Increase in CD of the St-based flocculants caused improved sludge dewaterability. Under the similar CD, CS-DML with relatively high hydrophobicity exhibited lower FCMC and SRF, larger and denser sludge flocs, and better permeability of sludge cakes than CS-DMCs due to the synergistic effects of charge neutralization, bridging flocculation and hydrophobic association. Furthermore, a second-order polynomial model on the basis of phenomenological theory was successfully applied to quantitatively evaluate the influences of the two important structural factors of these St-based flocculants, i.e., hydrophobicity and CD, on the sludge dewaterability. The structure–activity relationship of the St-based flocculants in sludge dewatering was obtained according to the theoretic simulation. The dewatering mechanisms was discussed in depth on the basis of the experimental and simulated results; besides, the FCMC and optimal dose can be predicted by the established structure–activity relationship. This current work offered a novel and valuable way to exploit and design of low-cost and high-performance graft natural polymeric flocculants applied in efficient conditioning of sludge.

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Toward green technology: a review on some efficient model plant-based coagulants/flocculants for freshwater and wastewater remediation

Cited by 60 publications

References 69 publications

Optimization studies on turbidity removal from cosmetics wastewater using aluminum sulfate and blends of fishbone

Optimization studies on turbidity removal from cosmetics wastewater using aluminum sulfate and blends of fishbone

Comparative study of the effects of Herbal and chemical Coagulants in the clarification of raw water

Evaluation of hydrophobically associating cationic starch-based flocculants in sludge dewatering

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