scholarly journals Application of Alum Sludge in Phosphate Phosphorus Removal from Contaminated Water

2019 ◽  
Vol 15 (2) ◽  
pp. 141-146
Author(s):  
B Ojha ◽  
R K Sharma ◽  
I. M. Amatya
Keyword(s):  
Adsorption Capacity ◽  
Removal Efficiency ◽  
Phosphorus Removal ◽  
Contact Time ◽  
Average Particle Size ◽  
Contaminated Water ◽  
Average Particle ◽  
Intensity Parameter ◽  
Alum Sludge ◽  
P Removal

This study determines application of alum sludge in phosphate phosphorus (PO43-/P) removal from contaminated water. For the study the alum sludge was collected from Mahankal Water Treatment Plant and dewatered by drying in micro oven under 105°C and crumble to average particle size of 5 mm. 10.7 ppm Synthetic PO43-/P solution was prepared by dissolving Na2HPO4.2H2O. Batch test was conduct to determine the PO43-/P removal efficiency and to develop adsorption isotherm. The phosphorus removal efficiency was tested for 8 g, 16 g, 24 g, 32 g and 40 g alum sludge per L PO43-/P solution for different contact time. The PO43-/P content in the sample solution was determine by L-Ascorbic Acid method using Spectrophotometer (Shimadzu UVmini-12400) in the lab of Pulchowk Campus, Institute of Engineering Tribhuvan University. The PO43-/P removal efficiency was found to be 95.5% for 8 g/L dosing and 98.4% % for 40 g/L. The contact time decreases with increase in dosing 50 min for 8 g/L and 5 min for 40 g/L dosing. The adsorption process best fit Freundlich isotherm with higher correlation coefficient (R2 = 0.87) and Freundlich intensity parameter (1/n) less than unit (1/n = 0.76) upto 50min contact time and beyond 50min contact time intensity parameter (1/n) greater than unit. The adsorption capacity determine from isotherm indicate increase in adsorption capacity with increase in dosing. The adsorption capacity increases from 1.39 to 28.07 mg/g when contract time varies from 1 to 120min.

scholarly journals PHOSPHORUS REMOVAL FROM IRAQI TREATED WASTEWATER USING ALUM SLUDGE

2021 ◽  
Vol 25 (Special) ◽  
pp. 3-203-3-212
Author(s):  
Aseel M. Alwan ◽  
◽  
Mohammad Ali Rashid ◽  
Keyword(s):  
Removal Efficiency ◽  
Phosphorus Removal ◽  
Contact Time ◽  
Room Temperature ◽  
Adsorption Process ◽  
Treatment Plant ◽  
Treated Wastewater ◽  
Small Particles ◽  
Phosphorous Removal ◽  
Alum Sludge

Phosphorus is one of the most important nutrients affecting the eutrophication, so its treatment is the most important thing that must be taken before wastewater is dumped into water bodies. This paper presents a study on phosphorous removal by adsorption with oven-dried-alum-sludge (ODAS) that was collected from Baqubah treatment plant (Iraq) and preheat at 105 ° C, cool down at room temperature, and crushed into small particles of (0.8-5) mm. The effect of ODAS studied with doses of 1.25-20 g/l and found that the higher the dose of adsorbent, the higher the percentage of phosphorous removal. Contact time also studied its effect on phosphorous removal and found that it has a clear effect on the adsorption process, as the percentage of phosphorous removal efficiency increased with increasing contact time. The optimum dosage of ODAS was 10 g/l and contact time 180 min with phosphorous removal efficiency (98%, 99%, 97%, and 97%) for initial concentration of (5, 10, 15, and 20) mg/l of phosphorus.

scholarly journals Dewatered alum sludge: a potential adsorbent for phosphorus removal

2006 ◽  
Vol 54 (5) ◽  
pp. 207-213 ◽  
Author(s):  
Y. Yang ◽  
D. Tomlinson ◽  
S. Kennedy ◽  
Y.Q . Zhao
Keyword(s):  
Water Treatment ◽  
Adsorption Capacity ◽  
Phosphorus Removal ◽  
Adsorption Process ◽  
Study Groups ◽  
Phosphorus Adsorption ◽  
Langmuir Adsorption ◽  
Adsorption Capacities ◽  
Alum Sludge ◽  
Best Fit

Alum sludge refers to the by-product from the processing of drinking water in water treatment works. In this study, groups of batch experiments were designed to identify the characteristics of dewatered alum sludge for phosphorus adsorption. Air-dried alum sludge (moisture content 10.2%), which was collected from a water treatment works in Dublin, was subjected to artificial P-rich wastewater adsorption tests using KH2PO4 as a model P source. Adsorption behaviours were investigated as a function of amount and particle size of alum sludge, pH of solution and adsorption time. The results have shown that pH plays a major role not only in the adsorption process but also in the adsorption capacity. With regard to adsorption capacity, this study reveals the Langmuir adsorption isotherm being the best fit with experimental data (R2=0.98–0.99). The maximum adsorption capacities range from 0.7 to 3.5 mg-P/g when the pH of the synthetic P solution was varied from 9.0 to 4.3, accordingly. The outcome of this study indicated that alum sludge is suitable for use as an adsorbent for removal of phosphate from wastewater.

Enhancing nitrogen and phosphorus removal in the BUCT–IFAS process by bypass flow strategy

2015 ◽  
Vol 72 (4) ◽  
pp. 528-534 ◽  
Author(s):  
Yang Bai ◽  
Xie Quan ◽  
Yaobin Zhang ◽  
Shuo Chen
Keyword(s):  
Carbon Source ◽  
Removal Efficiency ◽  
Phosphorus Removal ◽  
P Uptake ◽  
Flow Mode ◽  
Bypass Flow ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
University Of Cape Town ◽  
P Removal

A University of Cape Town process coupled with integrated fixed biofilm and activated sludge system was modified by bypass flow strategy (BUCT–IFAS) to enhance nitrogen and phosphorus removal from the wastewater containing insufficient carbon source. This process was operated under different bypass flow ratios (λ were 0, 0.4, 0.5, 0.6 and 0.7, respectively) to investigate the effect of different operational modes on the nitrogen (N) and phosphorus (P) removal efficiency (λ = 0 was noted as common mode, other λ were noted as bypass flow mode), and optimizing the N and P removal efficiency by altering the λ. Results showed that the best total nitrogen (TN) and total phosphorus (TP) removal performances were achieved at λ of 0.6, the effluent TN and TP averaged 14.0 and 0.4 mg/L meeting discharge standard (TN < 15 mg/L, TP < 0.5 mg/L). Correspondingly, the TN and TP removal efficiencies were 70% and 94%, respectively, which were 24 and 41% higher than those at λ of 0. In addition, the denitrification and anoxic P-uptake rates were increased by 23% and 23%, respectively, compared with those at λ of 0. These results demonstrated that the BUCT–IFAS process was an attractive method for enhancing nitrogen and phosphorus removal from wastewater containing insufficient carbon source.

scholarly journals Isothermal models of Chromium (VI) adsorption by using Fe3O4 nanoparticles

10.30544/489 ◽  
2020 ◽  
Author(s):  
Dang Tan Hiep ◽  
Bui Thi Hoa ◽  
Ngo Thi My Thanh ◽  
Nguyen Viet Long ◽  
Le Hong Phuc ◽  
...  
Keyword(s):  
Fe3o4 Nanoparticles ◽  
Contact Time ◽  
Ph Value ◽  
Average Particle Size ◽  
Adsorption Kinetic ◽  
Average Particle ◽  
Suitable Model ◽  
Isothermal Adsorption ◽  
Adsorption Models ◽  
Chromium Vi

The ferromagnetic Fe3O4 nanoparticles with the average particle size of about 10 nm were used to adsorb chromium (VI) in aqueous solution. The equilibrium of Cr(VI) adsorption can be achieved at the pH value of 2.5, in the contact time of 120 minutes. The mechanisms of Cr(VI) adsorption were evaluated by 4 isothermal adsorption models Langmuir, Freundlich, Redlich-Peterson, and Temkin. The results showed that all four models are satisfied; especially, Redlich-Peterson is the most suitable model to describe the adsorption kinetic of Cr(VI) on ferromagnetic Fe3O4 nanoparticles.

scholarly journals Adsorption of methylene blue from aqueous solutions by pyrolusite ore

2018 ◽  
Vol 18 (44) ◽  
pp. 5-11 ◽  
Author(s):  
Nizamettin Demirkıran ◽  
G D Turhan Özdemir ◽  
M Saraç ◽  
M Dardağan
Keyword(s):  
Methylene Blue ◽  
Particle Size ◽  
Contact Time ◽  
Average Particle Size ◽  
Dye Adsorption ◽  
Blue Dye ◽  
Average Particle ◽  
Order Kinetic ◽  
Adsorbent Dosage ◽  
Initial Ph

In this study, the adsorption of methylene blue dye was examined by using pyrolusite ore as a low-cost alternative adsorbent source. Pyrolusite, which contains mainly MnO2, is a manganese ore. The effects of the initial concentration of dye, contact time, initial pH of solution, adsorbent dosage, stirring speed of solution, and average particle size of adsorbent on the adsorption of methylene blue were studied. It was found that the percentage of the adsorbed dye increased with increasing the amount of pyrolusite. While the initial dye concentration, initial pH, contact time, stirring speed, particle size, and adsorbent dosage were 25 ppm, 6, 90 min, 250 rpm, 63 µm, and 12 g/l, respectively, the efficiency of dye adsorption on pyrolusite ore was 99%. The isotherm and kinetic studies relating to this adsorption process were also made. It was found that the equilibrium data followed the Langmuir isotherm model while the kinetic of process could be described by the pseudo-second order kinetic model.

scholarly journals Adsorption of phosphorus onto nanoscale zero-valent iron/activated carbon: removal mechanisms, thermodynamics, and interferences

2022 ◽  
Author(s):  
Adel Adly ◽  
Nagwan G. Mostafa ◽  
Abdelsalam Elawwad
Keyword(s):  
Activated Carbon ◽  
Removal Efficiency ◽  
Kinetic Models ◽  
Average Particle Size ◽  
Zero Valent Iron ◽  
Solution Temperature ◽  
Average Particle ◽  
Phosphorus Adsorption ◽  
Removal Mechanisms ◽  
Nanoscale Zero Valent Iron

Abstract This study investigated removal mechanisms, thermodynamics, and interferences of phosphorus adsorption onto nanoscale zero-valent iron (nZVI)/activated carbon composite. Activated carbon was successfully used as support for nZVI particles to overcome shortcomings of using nZVI include its tendency to aggregate and separation difficulties. A comprehensive characterization was done for the composite particles, which revealed a high specific surface area of 72.66 m2/g and an average particle size of 37 nm. Several adsorption isotherms and kinetic models have been applied to understand the removal mechanisms. Adsorption isotherm is best fitted by Freundlich and Langmuir models, which indicates that the estimated maximum phosphorus adsorption capacity is 53.76 mg/g at pH 4. Adsorption kinetics showed that the chemisorption process behaved according to a pseudo-second-order model. An adsorption mechanism study conducted using the intra-particle diffusion and Boyd kinetic models indicated that the adsorption rate is limited by surface diffusion. A thermodynamic study showed that phosphorus removal efficiency increased as the solution temperature increased from 15 to 37 °C. Finally, the results of an interference study showed that the presence of Ni2+, Cu2+, Ca2+, Na+ cations, nitrate ions (), and sodium acetate improves removal efficiency, while the presence of sulfate ions () and urea reduces removal efficiency.

scholarly journals Lab-Scale Column Study on Phosphorus Removal from Synthetic Wastewater by Filtralite P and Iron Filings

2017 ◽  
Author(s):  
Ala Kirjanova ◽  
Mindaugas Rimeika ◽  
Kristina Zopelytė
Keyword(s):  
Removal Efficiency ◽  
Phosphorus Removal ◽  
Experimental Period ◽  
Filter Material ◽  
Bottom Layer ◽  
Synthetic Wastewater ◽  
Column Study ◽  
Removal Capacity ◽  
P Removal

Column study was performed in order to compare phosphate phosphorus (PO4-P) removal capacity of iron filings and Filtralite P. The experiment with two vertical downflow columns (0.05 in diameter and with 0.9 m medium height) feeding synthetic wastewater was carried out over a period of 66 days at wastewater temperature of 17.2–21.8 ºC. The study also aimed to determine the effect of submergence of the medium on Filtralite P PO4-P removal potential. During the experiment the submerged Filtralite P sorbed almost double amount of PO4-P (1581 mg PO4-P/kg filter material or 662 mg PO4-P/m3 filter material) compared to the unsubmerged (881 mg PO4-P/kg filter material or 369 mg PO4-P/m3 filter material). In both cases PO4-P removal efficiency exceeded 90 % when pH in the effluent was higher than 9.5. Through the experimental period the iron filings removed 2249 mg PO4-P/kg filter material. When evaluating the amount of removed PO4-P per volume of filter material, the iron filings removed 2164 mg PO4-P/m3 filter material, i. e. 3.3 times more than the submerged Filtralite P did. In the case of iron filings the largest PO4-P amount was removed in the top layer (0–30 cm) of the filter material. The amount of removed PO4-P decreased and PO4-P removal efficiency increased with depth of the medium: in the top layer (0–30 cm) PO4-P removal efficiency was 27 %, whereas in the bottom layer (60–90 cm) it reached 44 %. The same tendency of PO4-P removal efficiency was observed in the column with the submerged Filtralite P; however, the PO4-P removal efficiency in all layers of this filter material was lower in comparison with the iron filings.

Comparative Study of Phenol Adsorption from Aqueous Solution onto Four Kinds of Absorbents

2014 ◽  
Vol 1056 ◽  
pp. 134-137
Author(s):  
Wei Fang Dong ◽  
Li Hua Zang ◽  
Xin Pang
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Fly Ash ◽  
Comparative Study ◽  
Adsorption Capacity ◽  
Removal Efficiency ◽  
Contact Time ◽  
Carbon Powder ◽  
Nay Zeolite ◽  
Phenol Adsorption

The absorbents including MnO2, fly ash, NaY zeolite and activated carbon powder were used to study the adsorption capacity of phenol. The effect of contact time and dosage of absorbents on the removal efficiency were investigated. The experimental results suggested that activated carbon powder is most effective absorbent, following as fly ash, MnO2 and NaY zeolite which the removal efficiency could reached 98.41%,77.65%, 60.19% and 24.13% at 90min respectively. The data indicated that the activated carbon powder was favorable for adsorption while NaY zeolite was unfit for absorbent of phenol from aqueous solution due to lower removal.

scholarly journals Kinetic Study, Modelling and Optimization of Adsorption Processes for Removal of Crude Oil from Contaminated Water using Chitosan-Rice Husk Ash Composite

2018 ◽  
pp. 1-10
Author(s):  
G. G. Oseke ◽  
M. T. Isa ◽  
M. S. Galadima ◽  
A. O. Ameh
Keyword(s):  
Crude Oil ◽  
Adsorption Capacity ◽  
Rice Husk ◽  
Contact Time ◽  
Rice Husk Ash ◽  
Kinetic Studies ◽  
Contaminated Water ◽  
Adsorbent Dosage ◽  
Temkin Isotherm ◽  
Adsorbate Concentration

This study was aimed at developing chitosan-rice husk ash adsorbent for the removal of crude oil from contaminated water. Design Expert software 6.06 was used to design the adsorption experiment. The adsorption was tested for Langmuir, Freundlich and Temkin isotherms and the kinetic studies also carried out. The effect of influencing parameters such as contact time, adsorbate concentration, adsorbent dosage and formulation ratio were studied. It was generally shown that adsorption process increased with time and adsorbate concentration and decreased with adsorbent dosage. Models for the prediction of adsorption capacity for the composite was significant with R2 value of 0.8382 and P-value of 0.0017. Optimum conditions were found to be 0.90 wt/wt chitosan/silica ratio, contact time of 5 min, and oil/water ratio of 0.25 v/v, which gave 20.66 g/g sorption capacity respectively. Adsorption isotherm studies of Langmuir, Freundlich and Temkin were carried out for the chitosan-rice husk ash composite. Temkin isotherm best fitted with R2 value of 0.9999. The adsorption capacity of composite from isotherm studies was obtained to be 18.85 g/g adsorbent. The heat of adsorption bT (kJmol-1) obtained from Temkin isotherm study was -48.67 kJ/mol indicating physisorption of adsorbents to the crude oil.  Kinetic studies indicated that the pseudo-second order model suitably described the removal of crude oil by the composite with R2 value 0.9999.

scholarly journals EFFICIENCY OF FERRIC SULPHATE FOR REMOVAL OF PHOSPHORUS FROM MEAT PROCESSING WASTEWATER

2015 ◽  
Author(s):  
Valerijus GASIŪNAS
Keyword(s):  
Removal Efficiency ◽  
Active Ingredient ◽  
Phosphorus Removal ◽  
Limiting Factors ◽  
Aeration Tank ◽  
Meat Processing ◽  
Ferric Sulphate ◽  
P Concentration ◽  
Total P ◽  
P Removal

Meat processing wastewater is heavily contaminated with phosphorus. It can be removed from wastewater by the use of flocculants. Phosphorus removal efficiency was estimated by treating wastewater with ferric sulphate flocculant, containing 11.5 percent of the active ingredient Fe3+ by weight. The research was conducted with wastewater pretreated in an aeration tank. Wastewater, containing 41.0 ± 3.5 mg l-1 of total phosphorus (TP), was dispensed into calibrated 1.0 liter containers with the following concentrations of flocculating agent: 0, 30, 75, 120, 150, 300, 450, 600, 750, 900 and 1,050 mg/l. The study showed that TP removal efficiency depends on the flocculant dose used for treatment. Increasing the flocculant dose decreases the efficiency of TP removal. One gram of Fe3+, given the flocculant dose of 40 gFe3+/m3, removed 0.5 g/m3 of TP, while 120 g/m3 of the flocculant removed around 40 percent less. According to the dependence of total P removed on the flocculant dose calculated by its active ingredient Fe3+, ferric sulphate flocculant is the most effective at doses of up to 60–80 g/m3 of Fe3+. The use of ferric sulphate may be limited by its impact on pH and sulphate concentrations in the effluent wastewater. If pH is not additionally adjusted, a maximum concentration of 70 g Fe3+/m3 can be used in order to maintain the pH of wastewater above 6.5 and to keep final sulphate concentration below 300 mg/l. In summary, a maximum of 70 g Fe3+/m3 can be used based on the total P removal efficiency and limiting factors. Such dose could remove 28 g total P/m3 from the wastewater. Since the permissible total P concentration in effluent wastewater is 4.0 mg/l, it is reasonable to use the ferric sulphate flocculant, containing 11.5 % of Fe3+ as an active ingredient, for treating wastewater with an initial total P concentration of up to 32 mg/l.

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