Different Types Of Coagulants Research Articles

Coagulation/Flocculation of Slaughterhouse Effluent Using Pac and Tanfloc as Coagulants

Objective: In this context, this research aimed to evaluate the influence of different types of coagulants, one inorganic and one natural (PAC and Tanfloc), in the treatment of an effluent from a pig slaughterhouse. Method/design/approach: Both coagulants were prepared in aqueous solution at the time of the test, 1% (v/v) for PAC and 0.5% (m/v) for Tanfloc. To assess the effect of the coagulants on the effluent, coagulation/flocculation tests were carried out using the jar-test apparatus. The dosages evaluated for both coagulants were 50, 100, 150, 200, 250 and 300 mg/L. The parameters analyzed were color and turbidity. Results and conclusion: According to the results of the statistical analysis, the optimum dosages obtained for both coagulants was 250 mg/L. With these dosages, removal of the parameters analyzed was observed (> 94% for turbidity and > 85% for color) with residuals (< 40 NTU for turbidity and < 400 uH for color), showing better results at this optimum dosage when Tanfloc is used as a coagulant. Implications of the research: The growing awareness that effluent treatment is of fundamental importance to public health and environmental pollution control has led us to look for low-cost alternatives to treat these effluents, using a vegetable organic coagulant based on tannin as an alternative to aluminum polychloride (PAC). Originality/value: Due to the growing need for low-cost, easily accessible treatments that do not require large areas, physical-chemical treatment of slaughterhouse effluent can be used as a pre-treatment, with the use of alternative coagulants, being a viable way to reduce organic matter for subsequent biological treatment, or in some cases replace the biological process.

Effect of different coagulants on physicochemical properties of paneer made from buffalo milk

This study was carried out to develop paneer with buffalo milk under four different coagulants: citric acid (T1), Lime (T2), Vinegar (T3), and Yoghurt (T4). The paneer samples were analyzed for nutritional composition, titratable acidity, pH and colour during the storage. Sensory evaluation was done for fresh paneer samples using a seven-point hedonic scale. The result revealed that the pH of developed paneer under T1, T2, T3 and T4 were 1.67, 2.09, 2.54, and 4.16, respectively. Titratable acidity and pH of paneer were (p<0.05) varied with 5 days storage at 70C. The highest yield (p<0.05), the whitest and hardest body of paneer was observed under T3. Moisture content was (p<0.05) higher under T3, and total solids, ash and fat were significantly (p<0.05) higher in T1. Sensory evaluation revealed that the different types of coagulants were significantly influenced (P<0.05) by sensory attributes. The overall acceptability was highest under T1. Conclusively, paneer produced with buffalo milk using vinegar and citric acid coagulants resulted in the most suitable products compared to other coagulants used in the present study.

Sequential Application of Different Types of Coagulants as an Innovative Method of Phosphorus Inactivation, on the Example of Lake Mielenko, Poland

The process of accelerated eutrophication forces the search for innovative, effective methods to restore the quality of surface waters. This study was conducted on shallow, urban Lake Mielenko (Maximum depth 1.9 m; Mean depth 1.3 m) in the context of implementing a new, sustainable method of lake restoration, i.e., phosphorus inactivation by sequential application of two types of coagulants. Approximately 9.9 tons of polyaluminium chloride (trade name PAX 18) were introduced into the profundal zone of Lake Mielenko, and 9.0 tons of iron chloride (trade name PIX 111) in the coastal area. The applications were divided into two spring and two autumn stages. Before restoration, the mean Pmin. concentration in Lake Mielenko water was 0.031 mg P/L, and TP was in the range of 0.091 to 0.346 mg P/L. After restoration, the average content of Pmin. was 0.007 mg P/L (a decrease of 80%), and the average value of TP was 0.096 mg P/L (a decrease of 72%). The obtained results indicate that phosphorus inactivation does not change nitrogen compounds’ content. However, due to the application of coagulants, P content decreased, i.e., the main factor limiting photosynthesis, which resulted in a significant decrease in primary production in Lake Mielenko. Before restoration, the average content of N-NH4 was 0.100 mg N/L, N-NO3—0.145 mg N/L, Norg. 1.70 mg N/L, and TN—1.86 mg N/L. After restoration, the average content of N-NH4 was 0.096 mg N/L, N-NO3—0.123 mg N/L, Norg. 1.28 mg N/L, and TN—1.50 mg N/L. This also resulted in a reduction in the Norg. content, as well as a reduction in the amount of chlorophyll a (from 30.51 to 13.41 mg/m3), organic compounds (BOD5 from 8.9 to 4.6 mg O2/L), and an increase in water transparency to the bottom (up to 1.45 m on average). The results obtained in Lake Mielenko indicate that the innovative method of phosphorus inactivation, which involves the sequential application of two types of phosphorus-binding preparations, is an excellent solution that ensures higher ecological safety in the coastal areas of the reservoir and also allows for a significant reduction in restoration costs.

Natural Organic Matter Removal in Surface Water Treatment via Coagulation—Current Issues, Potential Solutions, and New Findings

Considerable changes have been observed in surface waters’ quality in recent years. They include an increase in dissolved organic carbon (DOC) concentrations, as well as a shift of natural organic matter (NOM) composition in favor of low molecular weight (LMW), and they are expected to occur on a wider scale in the future. Those predictions are particularly worrying given the importance of surface water as the main potable water source for numerous communities across the globe. Conventional methods of surface water treatment for drinking purposes mostly focus on the process of coagulation. The progressing changes in the quality of surface waters, however, render the conventional treatment via coagulation inefficient. The issue of the presence of natural organic matter in drinking water sources, its anticipated changes, and the related treatment problems are all complex and pressing matters that need addressing. This paper aims to provide a critical review of recent findings regarding NOM removal via coagulation in reference to the current NOM-related issues and their potential solutions. The paper discusses the application of different types of coagulants, and their respective advantages and disadvantages. Coagulation-integrated processes including adsorption, membrane filtration, biological processes, and oxidation are also addressed. Lastly, insights on the future approach to the discussed issues and conclusions are presented.

Investigation of the Application of Coagulants in Case of Domestic Greywater Fraction

Abstract During our research work, we examined the removal of contaminants from synthetically produced bathing waters using different coagulants and studied the efficiency and the mechanism of coagulation-flocculation processes in detail. In our work, we performed experiments with two different types of coagulants (iron(III) chloride and polyelectrolyte) and compared their efficiencies. The zeta potential and its change were monitored as a qualifying parameter while other water quality parameters were also analyzed. In our experiments, a newly acquired flocculator device was also used to study the coagulation-flocculation processes of larger volume samples. The main goal of our research is to promote the sustainable management of drinking water quality and to study the bathing water reuse possibilities.

Chemical and microbial quality of whey from cow milk using calf rennet, microbial rennet, lactic acid and papaya latex

The purpose of the study was to determine the quality of whey obtained from cow milk using different types of coagulants (microbial rennet, calf rennet, lactic acid and papaya latex). The quality of whey was evaluated with the help of chemical and microbial tests. Results revealed that maximum whey yield (765 mL/L milk) was obtained from lactic acid coagulation which was 17 mL higher than that of the microbial rennet coagulation (p=0.000). The pH was found significantly (p<0.05) higher when the microbial rennet was used as coagulants. Whey obtained by the lactic acid coagulation was superior in terms of chemical quality compared to the whey obtained by coagulating action of other coagulating agents (p=0.000-0.001). Total solids and lactose content was found highest (7.2% and 4.8%, respectively) in lactic acid whey which was significantly higher (≈1%) than that of the other types of whey (p=0.000). In addition, protein content was also found higher (p<0.05) in whey obtained by lactic coagulation. On the other hand, efficiency of fat and ash recovery in curd was found lowest in calf rennet (p=0.000) among the studied coagulants. However, phosphorus content was highest (p=0.005) in calf rennet whey and the whey obtained by microbial rennet coagulation had the lowest (p=0.000) calcium concentration. Microbial load was found maximum (117 cfu × 104/mL) in whey drained out in microbial rennet coagulation, whereas, papaya latex whey had the lowest count (78 cfu × 104/ml), and the microbial count of other two whey was intermediate of them (p=0.000-0.001). In general, considering all the quality attributes, lactic acid whey was found better followed by calf rennet and papaya latex. It indicates more nutrient recovery in the curd produced by the microbial rennet.
 Bang. J. Anim. Sci. 2021. 50 (2): 107-113

Utilization and Standardization of Fermented Maize Waste Liquor as a Coagulant for Tofu Production and Its Effect on Tofu Quality

Coagulation of soymilk is the most important step in the production of tofu. Industrially, CaCl2, CaSO4, MgSO4 and MgCl2 are many of the different types of coagulants. Effluent from pap produced from maize is a local coagulant used; however, this has not been standardized. This study therefore aimed at standardizing fermented maize waste liquor (FMWL) as a local coagulant for tofu production. FMWL at ratios of 600 ml, 550 ml, 500 ml, 450 ml to 1000 ml soybean milk was used to prepare tofu and compared with tofu coagulated with lemon juice. The result revealed that the tofu coagulated with 550 ml of FMWL exhibited higher fat (47.78%) while tofu coagulated with 600 mls of FMWL had significantly (p<0.05) higher protein (31.75%). On the other hand, sample coagulated with 500 mls FMWL had significantly (p<0.05) higher crude fibre content. Soymilk coagulated with 400ml of FMWL exhibited significantly (p<0.05) higher contents of magnesium (75.42 mg/100g) and calcium (46.32 mg/100g) and iron (15.85 mg/100g) while the sample coagulated with lemon juice (control) had higher potassium content (201.17 mg/100g) The sensory evaluation result revealed that the control sample was highly acceptable to the panelists and this was followed closely with the sample coagulated with 550mls of FMWL. Hence, FMWL when utilized at a level of 550 mls will yield soybean curd that is acceptable and comparable to soybean curd coagulated with lemon juice. The use of FMWL will serve as an alternative, cheap and natural coagulant for soybean curd preparation at household and commercial levels.

Experimental dataset on the effect of soaking time and coagulant type on the overall quality of cheese extracted from Ethiopian belessa-95 (Glycine max) soya bean.

Vegetable protein as a replacement for raw materials for the dairy industries is essential to meet the gap between food supply and demand in Ethiopia with particular accentuation of soy protein-based milk and cheese. The experimental dataset presents the extraction of cheese from the soya bean (Belessa-95 or Glycine max). The effects of soaking time and types of coagulants on the overall properties of extracted soy cheese were analyzed. Sensory evaluation was accompanied to highlight the acceptability of the soy cheese product and to further strengthen the significance difference between samples. The experimental method involved pre-treatment as well as extraction process in which four levels of soaking time was taken (12, 24, 36 and 48 h) and three different types of coagulants were used including lemon juice, vinegar, and CaSO4•2H2O. Important properties were tasted to evaluate the best possible amount of soaking time and type of coagulant. These properties were mass yield (%), protein content (%), pH and proximate analysis comprising of moisture content (%), ash content (%) and total solid content (%). The different effects eminent within the values of physical tests are a reflection of the diverse coagulants utilized and different soaking time. Sensory analysis was conducted to further investigate the effect of soaking time and coagulant type. Five semi-trained respondents on a five-point hedonic scale were involved in the process. Data gathered from the sensory evaluation were statistically analyzed using one-way analysis of variance (ANOVA) with a significance level of 5%. Principal component analysis (PCA) was performed on the sensory data to provide additional multivariate graphical presentation.

Treatment of Petroleum and Flowstation Wastewater Using Combined Coagulants

Performance and effectiveness of single and combined coagulants in the treatment of petroleum and flow station wastewater has been studied. In this study, samples of petroleum and flowsation were treated separated with Barium Chloride, Iron (ii) sulphate, Magnesium Oxide and then with mixtures of different chemicals. Standard methods for examination of water and wastewater was used in the analysis of some important physico-chemical parameters. The results of the analysis of all the parameters in the petroleum and flow station wastewater samples treated with six different types of coagulants shows significant changes and variations in the level of virtually all the parameters in the treated samples when compared with that of the blank.The combined chemical coagulants exhibited a high capacity to reduce the pollutants to recommended effluent limits with the mixture of Magnesium Hydroxide and Iron (ii) Sulphate been the most effective coagulants. The result revealed that average value of all selected parameters showed variation from points A to F. However, these variations are not statistically significant with F (0.068019) being less than Fcritical Keywords : Petroleum, Flow station, Wastewater, Coagulants, ANOVA DOI : 10.7176/CPER/62-04 Publication date: January 31 st 2020

A Review on Color Removal from Industrial Wastewater using Different Types of Coagulants

A Review on Color Removal from Industrial Wastewater using Different Types of Coagulants

Comparison of conventional coagulation and electrocoagulation methods for dewatering of coal preparation plant

This study compares the results of the dewatering of coal preparation plants tailings by conventional coagulation processes using different types of coagulants and by electrocoagulation methods carried out by two different electrodes. When the results of electrocoagulation and conventional coagulation experiments were compared (aluminium electrode vs. ferric chloride), it was found that the coagulation efficiencies for both methods were similar, in the case that the aluminium electrode was used, there was a 22.2% decrease in the process cost compared to the use of ferric chloride.

16S rRNA Gene Amplicon Sequencing Reveals Significant Changes in Microbial Compositions during Cyanobacteria-Laden Drinking Water Sludge Storage.

This is the first study to systematically investigate the microbial community structure in cyanobacteria-laden drinking water sludge generated by different types of coagulants (including AlCl3, FeCl3, and polymeric aluminum ferric chloride (PAFC)) using Illumina 16S rRNA gene MiSeq sequencing. Results show that Cyanobacteria, Proteobacteria, Firmicutes, Bacteroidetes, Verrucomicrobia, and Planctomycetes were the most dominant phyla in sludge, and because of the toxicity of high Al and Fe level in AlCl3 and FeCl3 sludges, respectively, the PAFC sludge exhibited greater microbial richness than that in AlCl3 and FeCl3 sludges. Due to lack of light and oxygen in sludge, relative abundance of the dominant genera Microcystis, Rhodobacter, Phenylobacterium, and Hydrogenophaga clearly decreased, especially after 4 days storage, and the amounts of extracellular microcystin and organic matter rose. As a result, the relative abundance of microcystin and organic degradation bacteria increased significantly, including pathogens such as Bacillus cereus, in particular after 4 days storage. Hence, sludge should be disposed of within 4 days to prevent massive growth of pathogens. In addition, because the increase of extracellular microcystins, organic matter, and pathogens in AlCl3 sludge was higher than that in FeCl3 and PAFC sludges, FeCl3 and PAFC may be ideal coagulants in drinking water treatment plants.

An investigation into the performance of a high-speed synthetic fiber filter employing different types of coagulants

An investigation into the performance of a high-speed synthetic fiber filter employing different types of coagulants

Comparison of flocs characteristics using before and after composite coagulants under different coagulation mechanisms

The flocs generated by different coagulants under various coagulation mechanisms produce fundamentally different floc characteristics. In this investigation, the fractal dimensions of aggregates produced by the different types of coagulants and coagulation mechanisms to drilling wastewater were described with image-based techniques. The flocs properties, which were evaluated in terms of floc strength, size and structure, formed by non-composite, polyferric chloride (PFC), and by a novel composite coagulant, polyferric chloride −polydimethyldiallylammonium chloride (PFC-PDM), were comparatively investigated. Besides, an intrinsic unity of relation among the floc properties under various coagulation mechanisms was also reported. It was found that the composite coagulant could exhibit better bridging capacity during coagulation process. Fractal dimension analysis revealed that PFC-PDM tended to form more regular and compact flocs with larger Dpf value than PFC formed. The results clearly demonstrated that the size of PFC-PDM-floc was larger than that of PFC-floc. Additionally, the PFC-PDM-flocs strength were higher than PFC-flocs, indicating that the aggregated flocs induced by the composite coagulant could be more resistant to shear and more recoverable than those induced by the non-composite coagulant. Those presented above results indicate that PFC-PDM may be used as alternative coagulant during wastewater treatment process with some capacities exceeding that of PFC, providing there is an economic and practical method to improve floc properties from its application.

Determination of optimum polymeric coagulant in palm oil mill effluent coagulation using multiple-objective optimisation on the basis of ratio analysis (MOORA).

The main limitation of a conventional palm oil mill effluent (POME) ponding system lies in its inability to completely decolourise effluent. Decolourisation of effluent is aesthetically and environmentally crucial. However, determination of the optimum process parameters is becoming more complex with the increase of the number of coagulants and responses. The primary objective of this study is to determine the optimum polymeric coagulant in the coagulation-flocculation process of palm oil mill effluent by considering all output responses, namely lignin-tannin, low molecular mass coloured compounds (LMMCC), chemical oxygen demand (COD), ammonia nitrogen (NH3-N), pH and conductivity. Here, multiple-objective optimisation on the basis of ratio analysis (MOORA) is employed to discretely measure multiple response characteristics of five different types of coagulants as a function of assessment value. The optimum coagulant is determined based on the highest assessment value and was identified as QF25610 (cationic polyacrylamide). On the other hand, the lowest assessment value was represented by AN1800 (anionic polyacrylamide). This study highlights the simplicity of MOORA approach in handling various input and output parameters, and it may be useful in other wastewater treatment processes as well.

Phase separation analysis of Extem/solvent/non-solvent systems and relation with membrane morphology

The phase separation behavior of Extem/water/solvent systems for various solvents and Extem/NMP/non-solvent systems for different types of coagulants was investigated. Ternary phase diagrams of studied systems were constructed based on cloud point data obtained by titration at room temperature. In the first part, N-methyl-2-pyrrolidone (NMP), dimethylacetamide (DMAc), dimethylformamide (DMF) and dimethyl sulfoxide (DMSO) were employed as solvent and water was used as coagulant. The cloud point curves from these systems showed that Extem/NMP/water and Extem/DMSO/water has the smallest and largest demixing gap, respectively. Subsequently, water, methanol, and glycerol were employed as coagulants and NMP was selected as solvent. The obtained results indicated that water and methanol had the strongest and weakest coagulant power, respectively. The linearized cloud point and precipitation value were applied to identify the strength of the non-solvent for casting solution (Extem/NMP) with a certain concentration. The solubility curve of Extem was obtained using the Hansen solubility parameter, calculated by a group contribution method. In order to evaluate the influence of different solvents and non-solvents on the final structure of the resulting membranes, scanning electron microscopy (SEM) was used. The morphology of the membranes prepared from Extem/solvent/water systems (except Extem/DMSO/water) showed a finger like sub-layer, while a sponge-like structure was observed for the Extem/DMSO/water system. Using methanol as coagulation medium resulted in a thick dense layer over a macroporous sub layer, while a fully sponge like structure with microporous skin layer was obtained for the Extem/NMP/glycerol system. In order to find the source of these unexpected observations, thermodynamic and kinematic aspects such as binary interaction parameters, heat of mixing, viscosity and diffusion rate were discussed thoroughly.

A Comparative Study of Floc and Sludge of Leachate under Different Types of Coagulants

This study compared the floc and sludge formed during the coagulation of leachate by different types of coagulants. The coagulants tested in this study were Ferric chloride (FC), pre-hydrolyzed iron (PHI), dual coagulant (PHI+TF(tapioca flour)), and composite coagulant (pre mix of PHI and TF (PHITF)). The floc and sludge were characterized by measuring the sludge volume index (SVI), sludge velocity (SV), and floc size. Results showed that the hierarchy for SVI, SV, and floc size were FC>PHI>PHI+TF>PHITF, PHITF>PHI+TF>PHI>FC, and PHI+TF>PHITF>PHI>FC, respectively. PHITF demonstrated the lowest SVI and the shortest sludge settling time among the tested coagulants. PHI+TF produced the largest floc size. The addition of TF in PHI as a composite and dual coagulant significantly improved the floc and sludge characteristics. PHITF improved the floc and sludge formation of partially stabilized leachate.This study compared the floc and sludge formed during the coagulation of leachate by different types of coagulants. The coagulants tested in this study were Ferric chloride (FC), pre-hydrolyzed iron (PHI), dual coagulant (PHI+TF(tapioca flour)), and composite coagulant (pre mix of PHI and TF (PHITF)). The floc and sludge were characterized by measuring the sludge volume index (SVI), sludge velocity (SV), and floc size. Results showed that the hierarchy for SVI, SV, and floc size were FC>PHI>PHI+TF>PHITF, PHITF>PHI+TF>PHI>FC, and PHI+TF>PHITF>PHI>FC, respectively. PHITF demonstrated the lowest SVI and the shortest sludge settling time among the tested coagulants. PHI+TF produced the largest floc size. The addition of TF in PHI as a composite and dual coagulant significantly improved the floc and sludge characteristics. PHITF improved the floc and sludge formation of partially stabilized leachate.

In-line coagulation to reduce high-pressure membrane fouling in an integrated membrane system: a case study

Membrane fouling is a critical problem for many nanofiltration (NF) membrane plants. This study demonstrated that the poor spaces of the NF membrane were decreased for the deposition of natural organic matter (NOM) on the membrane surface. In-line coagulation was added prior to the low-pressure filtration step to remove more organic material by microfiltration (MF), thereby improving the quality of the feed-water entering the NF membranes. Three different types of coagulants, i.e. aluminum sulfate, ferric chloride, and polyaluminum chloride, with their different levels at different pH values were used for this study. The optimal dose of each coagulant was determined, and the impact on the NF membrane was assessed by batching and running 20 L of post-coagulation MF permeate through a bench-scale NF membrane for 200 h. Ferric chloride was found to perform the best of these three tested coagulants to reduce NF pressure fouling by reduction of NOM in the NF feed-water. High performance size exclusion chromatography study revealed that higher molecular weight fractions of NOM removed preferentially due to in-line coagulation processes. The scanning electron microscopy analysis of the fouled NF membrane trial revealed that the foulant layer consisted of a very large quantity of inorganic and organic matter, bacteria, which resulted in a very rough surface topography.

Analysis of Polyetherimide/N-Methyl-2-Pyrrolidone/nonsolvent phase separation behavior

Nonsolvent Induced Phase Separation (NIPS) is among the most well-known methods for membrane fabrication in which the phase separation behavior of the polymer solution is one factor that governs the structure of the membrane ultimately obtained. In this study, phase separation behavior of the polyetherimide (PEI)-casting dope was investigated for different types of coagulants and nonsolvent additives. Cloud point data were obtained by the titration method on the ternary polyetherimide/solvent/coagulant diagram from a limited number of experiments. The whole cloud point curves were then drawn by calculation using the fitting parameters based on the linearized cloud point relation (LCP). In the first part, water, methanol, ethanol, glycerol, and acetic acid were used as the coagulants for the PEI/NMP solution. The cloud point curves obtained for the above coagulants indicated that water has the strongest coagulation power among them. In the second part, methanol, ethanol, glycerol, and acetic acid were used as nonsolvent additives to NMP in different (nonsolvent additive/NMP) mass ratios. The latter (NMP + nonsolvent additive) mixtures were then used as the solvents to prepare PEI/(NMP + nonsolvent additive) solutions. The cloud point data obtained for the above solutions using water as a coagulant indicated that the cloud point curves shift toward the polymer/solution axis as the (nonsolvent additive/NMP) mass ratio increases.

Lab and pilot scale investigations on membrane fouling during the ultrafiltration of surface water

In the combined laboratory and pilot plant investigation powder activated carbon dosing and inline coagulation were investigated for surface water from river Spree. The aim was to understand the fouling behaviour of this raw water and to understand and to identify strategies to minimize the irreversible fouling in this application. Trials with activated carbon showed significant differences in the adsorption of biopolymers on different types of carbon. Whereas the TOC removal was in the same range for both types the coarse carbon type showed very small removal of biopolymers. The effect of different types of coagulants, dosage and pH was investigated in a laboratory filtration set up. Samples were investigated by LC-OCD measurements for fractionation of DOC for raw water, flocculated water and permeate. The removal of biopolymers was possible with iron and alumina salts, however the alumina salts tend to remove humic acids as well and this results in a higher overall DOC removal. In the pilot plant the inline coagulation was investigated under actual site conditions. Whereas the results for the effect of coagulation and DOC removal were confirmed it turned out that aluminium coagulants give a significantly higher increase in differential pressure. The use of ferric coagulants at slightly acidic pH was thus identified as a robust method to achieve a stable performance of the ultrafiltration system at this site.