scholarly journals Enhanced removal of phosphate from wastewater by precipitation coupled with flocculation

2021 ◽  
pp. 5-10
Author(s):  
Ho Hong Quyen Ho
Keyword(s):  
Removal Efficiency ◽  
Filter Paper ◽  
Alginic Acid ◽  
Weight Ratio ◽  
Phosphate Concentration ◽  
Phosphate Removal ◽  
Synthetic Wastewater ◽  
Phosphate Solution

Eco-friendly flocculants of alginic acid, NaHCO3 and CaCl2.2H2O with advantages of strong gelation characteristics were prepared for supporting the removal of phosphate in synthetic wastewater using CaO and Ca(OH)2 as precipitants. The effects of weight ratios of each component in flocculants, dosage of flocculants and initial phosphate concentration were investigated through batch of experiments. The results showed excellent flocculation performance with the weight ratio of alginic acid:NaHCO3 and CaCl2.2H2O at 1:0.3:0.02 and the dosage of flocculants at 0.0050 g/25 mL of phosphate solution in the range of initial phosphate concentration from 50 to 1000 ppm. Comparing to the sample without flocculants, the phosphate removal efficiency using CaO and Ca(OH)2 with the addition of flocculants increased from 19 and 20% to 97% at the initial phosphate concentration of 50 ppm, respectively by filtration of filter paper 2.7 μm.

Eco-friendly removal of phosphate from aqueous solution using natural dietary fibers and minerals

2018 ◽  
Vol 32 (19) ◽  
pp. 1840075
Author(s):  
Ho Hong Quyen ◽  
Maki Yoshioka ◽  
Masashi Kurashina ◽  
Mikito Yasuzawa ◽  
Le Thi Xuan Thuy
Keyword(s):  
Aqueous Solution ◽  
Filter Paper ◽  
Adsorption Process ◽  
Alginic Acid ◽  
Removal Rate ◽  
Membrane Filter ◽  
Phosphate Concentration ◽  
Phosphate Removal ◽  
Dietary Fibers ◽  
Particle Retention

In this study, we focused on the investigation of phosphate removal using calcium oxide (CaO) and calcium hydroxide (Ca(OH)2) which are mainly from the calcined shells as adsorbents. Hydroxylapatite Ca[Formula: see text](PO4)6(OH)2, the component of industrial fertilizer was formed after the adsorption process following the XRD results. The phosphate removal increased from 20% to 97% with the aid of the mixture of flocculants alginic acid (AA), NaHCO3 and CaCl[Formula: see text] 2H2O in the case of 50 ppm phosphate concentration when the samples were filtered through 2.7 [Formula: see text]m particle retention filter paper which is roughly equivalent to the case of phosphate removal rate of 0.2 [Formula: see text]m membrane filter paper without flocculants (99%). The results suggest that AA, NaHCO3 and CaCl[Formula: see text]2H2O as the flocculants are effective for phosphate removal from 20 to 100 ppm.

scholarly journals Nutrient removal efficiency of green algal strains at high phosphate concentrations

2019 ◽  
Vol 80 (10) ◽  
pp. 1832-1843 ◽  
Author(s):  
Jairo Hernan Moreno Osorio ◽  
Angelo Del Mondo ◽  
Gabriele Pinto ◽  
Antonino Pollio ◽  
Luigi Frunzo ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Nutrient Removal ◽  
Ammonium Acetate ◽  
Carbon Sources ◽  
Phosphate Removal ◽  
Synthetic Wastewater ◽  
Green Algal ◽  
Nutrient Removal Efficiency ◽  
High Phosphate ◽  
Mixotrophic Conditions

Abstract The effects of autotrophic and mixotrophic conditions on microalgae growth and nutrient removal efficiency from synthetic wastewater by different microalgae were investigated. Although several studies have demonstrated the suitability of microalgae technologies for ammonia-rich wastewater treatment, only a few have been used for treatment of phosphate-rich industrial wastewaters. In this work, six microalgae were cultivated in batch mode in a growth medium with a high phosphate concentration (0.74 Mm PO43−-P) and different carbon sources (ammonium acetate and sodium bicarbonate) without CO2 supplementation or pH adjustment. Their potential for nutrient removal and biomass generation was estimated. The biomass growth in the reactors was modeled and the data aligned to the Verhulst model with R2 > 0.93 in all cases. Chlorella pyrenoidosa ACUF_808 showed the highest final biomass productivity of 106.21 and 75.71 mg·L−1·d−1 in media with inorganic and organic carbon sources, respectively. The highest phosphorus removal efficiency was 32% with Chlorella vulgaris ACUF_809, while the nitrate removal efficiency in all reactors exceeded 93%. The coupled cultivation of the novel isolated strains of C. pyrenoidosa and C. vulgaris under mixotrophic conditions supplemented with ammonium acetate might be a promising solution for simultaneous nitrate and phosphate removal from phosphorus-rich wastewaters.

Ureolytic phosphate precipitation from anaerobic effluents

2009 ◽  
Vol 59 (10) ◽  
pp. 1983-1988 ◽  
Author(s):  
E. Desmidt ◽  
W. Verstraete ◽  
J. Dick ◽  
B. D. Meesschaert ◽  
M. Carballa
Keyword(s):  
Hydraulic Retention Time ◽  
Ph Value ◽  
Continuous Operation ◽  
Phosphate Concentration ◽  
Phosphate Removal ◽  
Synthetic Wastewater ◽  
Processing Industry ◽  
Operational Conditions ◽  
Constant Ph ◽  
High Concentrations

In this work, the elimination of phosphate from industrial anaerobic effluents was evaluated at lab-scale. For that purpose, the ureolytic method previously developed for the precipitation of Ca2 +  from wastewater as calcite was adapted for the precipitation of phosphate as struvite. In the first part of the study, computer simulations using MAPLE and PHREEQC were performed to model phosphate precipitation from wastewater as struvite. The results obtained showed that relative high concentrations of ammonium and magnesium are needed to precipitate phosphate as struvite. The total molar concentrations ratio of Mg2 + :PO43−-P:NH4+ required to decrease PO43−-P concentrations from 20 to 6 mg PO43−-P/l at pH 8.4-8.5 was estimated on 4.6:1:8. In the second part of the study, lab-scale experiments with either synthetic wastewater or the anaerobic effluent from a vegetable processing industry were carried out in batch and continuous mode. Overall, the continuous operation at a hydraulic retention time (HRT) of 2.4 h and an added molar concentration [Mg2 + ]:[PO43−-P]:[NH4+] ratio of 1.6:1:2.3 resulted in a constant pH value in the reactor (around 8.5) and an efficient phosphate removal (>90%) to residual levels of 1–2 mg PO43−-P/l. Different operational conditions, such as the initial phosphate concentration, HRT and the use of CaCl2 or MgO instead of MgCl2, were analysed and the performance of the reactor was satisfactory under a broad range of them. Yet, overall, optimal results (higher phosphate removal) were obtained with MgCl2.

Removal of Phosphate from Aqueous Solution by Using Red Mud

2011 ◽  
Vol 291-294 ◽  
pp. 1804-1807 ◽  
Author(s):  
Xin Feng Zhu ◽  
Hong Ye Liu ◽  
Peng Hui Shi ◽  
Jun Feng Wu ◽  
Yi Fei Guo
Keyword(s):  
Aqueous Solution ◽  
Reaction Time ◽  
Removal Efficiency ◽  
Red Mud ◽  
Phosphate Concentration ◽  
Phosphate Removal ◽  
Batch Experiments ◽  
Reaction Conditions ◽  
Optimal Reaction

Red mud has been used to develop effective adsorbents to remove phosphate from aqueous solution. The effects of different dosage, pH of solution and reaction time on adsorption have been examined in batch experiments. It was found that red mud samples show higher removal efficiency for phosphate. The results showed that phosphate removal efficiency was found to be 97 % with optimal reaction conditions initial phosphate concentration 100mg L−1, red mud dosage 10g L−1, pH 2.0, respectively. The phosphate removal efficiency of the red mud adsorbents decreases with increase of pH.

scholarly journals Effect of electrode configuration and voltage variations on electrocoagulation process in phosphate removal of laundry wastewater

2021 ◽  
Vol 896 (1) ◽  
pp. 012025
Author(s):  
B P Samadikun ◽  
W Oktiawan ◽  
Junaidi ◽  
A K Rais ◽  
T A Taqiyya ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Removal Efficiency ◽  
Phosphate Concentration ◽  
Phosphate Removal ◽  
Electrode Configuration ◽  
Optimum Result ◽  
Electrocoagulation Process ◽  
The Government ◽  
Electrode Plate

Abstract Indonesia is one of the countries that still have to deal with waste problems. In reducing waste, the government has made a series of efforts to reduce waste, especially wastewater. There are many kinds of wastewater. One of them is laundry wastewater. This research aims to estimate the dangerous substance in laundry wastewater and how to treat it. The method using some variables like Al-Al, Al-Fe, Fe-Fe, and Fe-Al and the voltage is changing from 20 V, 30 V, 40 V, and 60 V. The research shows that the most optimum result of laundry wastewater treatment was using Al-Fe electrode plate 60 V. The result that the phosphate concentration decreased by 6.56 mg/l from 9.58 mg/l to 3.01 mg/l and obtained phosphate removal efficiency of 68.56%. The most optimum results for the removal of phosphate levels contained in the 60 V voltage.

scholarly journals Removal of Low Concentration Phosphate in Phosphogypsum Leachate

2019 ◽  
Vol 136 ◽  
pp. 06018
Author(s):  
Zhixiang Liu ◽  
Juan Feng ◽  
Chendi Min ◽  
Lei Gan ◽  
Ying Shi
Keyword(s):  
Removal Efficiency ◽  
Quartz Sand ◽  
Phosphate Concentration ◽  
Phosphate Removal ◽  
Adsorption Time ◽  
Adsorbent Dosage ◽  
Low Concentration ◽  
Optimum Dosage

In order to find a method for removing low-concentration phosphate from phosphogypsum leachate, modified quartz sand was used as adsorbent. The effects of adsorbent dosage, phosphate concentration and adsorption time on phosphate removal efficiency were investigated. The results show that the optimum dosage of modified quartz sand was 0.024g/mL. The effluent phosphate concentration was lower than 0.023g/mL, and the phosphate removal efficiency could reach up to 98%.

Removal of Phosphate Anions from Aqueous Solutions Using Dolomite as Adsorbent

2013 ◽  
Vol 864-867 ◽  
pp. 1454-1457 ◽  
Author(s):  
Xiao Li Yuan ◽  
Wen Tang Xia ◽  
Juan An ◽  
Wen Qiang Yang ◽  
Jian Guo Yin
Keyword(s):  
Particle Size ◽  
Reaction Time ◽  
Removal Efficiency ◽  
Solid Material ◽  
Phosphate Concentration ◽  
Phosphate Removal ◽  
Adsorbent Dosage ◽  
Initial Ph ◽  
Phosphate Anions ◽  
Second Category

Dolomite, an industrial solid material was used as an adsorbent to remove phosphate anions from wastewater. The effects of initial pH, initial phosphate concentration, reaction time, reaction temperature and adsorbent dosage on the phosphate removal efficiency were investigated. The results show that the phosphate removal efficiency exceed 99% under the conditions of pH 9.5, temperature 30 °C, reaction time 50 min, particle size <0.074 mm, initial phosphate concentration 50 mg•L-1, adsorbent dosage 10g•L-1 and stirring speed 250 r/min. After phosphate removal reaction, the residual phosphate concentrations completely meet the requirement of national discharge standards of the second category pollution (GB 1A (TP = 0.5 mgL-1)).

Phosphate removal and recovery by a novel electrolytic process

2002 ◽  
Vol 46 (11-12) ◽  
pp. 147-152 ◽  
Author(s):  
Y. Sakakibara ◽  
H. Nakajima
Keyword(s):  
Electric Current ◽  
Removal Rate ◽  
Phosphate Concentration ◽  
Phosphate Removal ◽  
Synthetic Wastewater ◽  
Bulk Liquid ◽  
Anode Surface ◽  
Electrolytic Process ◽  
Current Densities ◽  
Good Agreement

The possibility of removing and recovering phosphate from wastewater by a novel electrolytic process was investigated experimentally. In the process, ion electrodes are immersed in synthetic wastewater and direct current (DC) is applied to coagulate phosphate on the surface of the anode. Experimental results demonstrated that at electric current densities ranged from 0.001 to 0.1 mA/cm2, phosphate was removed and recovered as phosphate-rich aggregates formed on the anode surface. Decreases in phosphate concentration at bulk liquid were in fairly good agreement with the amounts of phosphate in the aggregates. Moreover, the removal rate of phosphate was increased with increasing electric current. In addition, as heavy metal anions such as Cu2+ deposit on the counter electrode (cathode), it was thought that relatively pure phosphate could be obtained by the present process.

OPTIMIZATION OF PHOSPHATE REMOVAL FROM SYNTHETIC WASTEWATER BY BACTERIAL CONSORTIUM USING BOX-BEHNKEN DESIGN

2013 ◽  
Vol 12 (12) ◽  
pp. 2371-2383
Author(s):  
Krishnaswamy Usharani ◽  
Perumalsamy Lakshmanaperumalsamy ◽  
Muthusamy Muthukumar
Keyword(s):  
Bacterial Consortium ◽  
Phosphate Removal ◽  
Synthetic Wastewater ◽  
Box Behnken Design
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