Removal of Arsenic from Micro-Polluted Water by Enhanced Coagulation Process

By the coagulation-flocculation jar test, the PAC adsorption property and coagulation removal property of Atrazine and Chlorothalonil, and influence on removal effect of Atrazine and Chlorothalonil by PAC Adsorption and Enhanced Coagulation in combination have been acknowledged, with different doses of PAC or polyaluminium chloride. The results of test showed that PAC can absorb Atrazine and Chlorothalonil effectively, and that the removal effect of the enhanced coagulation for Atrazine and Chlorothalonil is affected by coagulation effect. Enhanced coagulation cannot remove Atrazine effectively, while it can remove 75% of Chlorothalonil. PAC adsorption and enhanced coagulation in combination can remove Atrazine and Chlorothalonil effectively. For the initial concentration of 0.1 mg/L of Atrazine, dosage of 60mg/L of PAC and 20mg/L polyaluminium chloride can reach more than 98% removal efficiency, and make treated water standard. For the initial concentration of 0.1 mg/L of Chlorothalonil, dosage of 20mg/L of PAC and 20mg/L polyaluminium chloride can reach more than 90% removal efficiency and make treated water up to standard.

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Efficient removal of arsenic from water by dielectrophoresis-assisted adsorption

Water Science & Technology Water Supply ◽

10.2166/ws.2018.155 ◽

2018 ◽

Vol 19 (4) ◽

pp. 1066-1072

Author(s):

Q. H. Jin ◽

C. Y. Cui ◽

H. Y. Chen ◽

Y. Wang ◽

J. F. Geng ◽

...

Keyword(s):

Adsorption Capacity ◽

Removal Efficiency ◽

Solution Ph ◽

Residual Concentration ◽

Initial Concentration ◽

Weight Percentage ◽

Before And After ◽

High Concentrations ◽

Plant Ash ◽

Adsorbent Dose

Abstract Adsorption (ADS) and dielectrophoresis (DEP) techniques were combined (ADS/DEP) to efficiently remove As(V) in industrial wastewater. Fly ash, activated carbon, corncob and plant ash were tested to determine the best adsorbent by their adsorption capacity. Plant ash showed the highest adsorption capacity compared with the others. Different parameters such as solution pH and adsorbent dose were explored. The maximum As(V) removal efficiency was 91.4% at the optimized conditions (pH 9.0, adsorbent dose 5 g/L) when the initial concentration of As(V) was 15 mg/L. With the ADS/DEP technique, the plant ash particles with adsorbed As(V) were trapped on the electrodes in a DEP device. The ADS/DEP process could increase the removal efficiency of As(V) to 94.7% at 14 V even when the initial concentration of As(V) was 15 mg/L. And the residual concentration of As(V) decreased to 0.34 mg/L after two series of the ADS/DEP process. The adsorbents before and after DEP were examined by scanning electron microscope (SEM) and energy dispersive X-ray (EDX) analysis. After the DEP process, the weight percentage of As(V) on the adsorbent surface increased to 0.96% from 0.5%. The ADS/DEP process could be a new efficient way to remove arsenic pollutant at high concentrations.

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Removal of phosphorus compounds from water experience from technological research

E3S Web of Conferences ◽

10.1051/e3sconf/20185900008 ◽

2018 ◽

Vol 59 ◽

pp. 00008

Author(s):

Alina Pruss ◽

Paweł Pruss

Keyword(s):

Phosphorus Compounds ◽

Raw Water ◽

Limit Values ◽

Technological Research ◽

Soil Application ◽

Treated Water ◽

Variable Concentration ◽

Coagulation Process ◽

Required Quality

The aim of the technological research was to determine the technology which would enable reduction of the concentration of phosphorus compounds in water to the level of 0.02 mg PTot/dm3. The raw water during the study period was characterized by a pH of 6.66 to 7.62 and a variable concentration of phosphorus compounds ranging from 0.150 to 0.366 mg PTot/dm3, including phosphates in the range of 0.039 to 0.089 mg PO4/dm3. The concentration of chlorides was below 10 mg Cl/dm3 and sulphates did not exceed 14 mg SO4/dm3. Treated water was intended for soil application therefore its quality after treatment could not exceed the limit values set forth in the regulations in force during the study period. The conducted research has shown that the use of the coagulation process based on the ferric coagulant PIX 112 combined with rapid filtration ensures the required quality of the treated water, among other things, through lowering the concentration of PTot to 0.02 mg/dm3.

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RESEARCH ON ELECTROCHEMICAL METHODS TO REMOVE FLUORIDE FROM WATER

HUE UNIVERSITY JOURNAL OF SCIENCE TECHNIQUES AND TECHNOLOGY ◽

10.26459/hueuni-jtt.v126i2b.4582 ◽

2017 ◽

Vol 126 (2B) ◽

Author(s):

Võ Anh Khuê

Keyword(s):

Optimal Condition ◽

Removal Efficiency ◽

Water Solution ◽

Electrochemical Methods ◽

Fluoride Ion ◽

Residual Concentration ◽

Initial Concentration ◽

Iron Electrodes ◽

Aluminum Electrodes

<p>The use of electrochemical methods such as micro-electrolysis, electrocoagulation, and micro-electrolysis combined with electrocoagulation to remove fluoride from water were studied in this paper. The results indicated that the micro-electrolysis (using Fe/C particles) and the electrocoagulation (using iron electrodes) are not suitable for removal of fluoride from water solution. The electrocoagulation method with aluminum electrodes for removal efficiency of fluoride is very good. But it is not as good as the micro-electrolysis (using Fe/C particles) combined with the electrocoagulation method (using aluminum electrodes). At the optimal condition of the micro-electrolysis (using Fe/C particles) combined with the electrocoagulation method (using aluminum electrodes) and the initial concentration of fluoride ion of 50 mg/L, the removal efficiency of fluoride ion is 94.03% and the residual concentration is 2.986 mg/L.</p>

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Elimination of Arsenic (III) using Phaseolus Lunatus and Phaseolus Vulgaris as Natural Coagulants

International Journal of Engineering and Advanced Technology - Regular Issue ◽

10.35940/ijeat.f2940.0810621 ◽

2021 ◽

Vol 10 (6) ◽

pp. 66-69

Author(s):

Vijayarani. A* ◽

Keyword(s):

Aqueous Solution ◽

Phaseolus Vulgaris ◽

Removal Efficiency ◽

Phaseolus Lunatus ◽

Test Protocol ◽

Jar Test ◽

Coagulation Process ◽

Coagulation Mechanism ◽

Natural Coagulants ◽

Removal Of Arsenic

In this analysis, the efficacy of adding coagulants such as Phaseolus lunatus and Phaseolus vulgaris (polymers) to the coagulation process during the treatment of arsenic aqueous solution to extract the arsenic metal was investigated. Experiments were carried out to evaluate the output of Phaseolus lunatus and Phaseolus vulgaris, both individually and in combination with arsenic, using the standard Jar test protocol. P.lunatus and P.vulgaris were given doses ranging from 1 to 3 gm. For P.lunatus and P.vulgaris, the (optimal) removal efficiency for total arsenic in the aqueous solution was obtained at 2gm. With chemical affinity between arsenic and coagulants used in this process, the valence state of arsenic may affect removal efficiency during the chemical coagulation process. pH is discovered to be a significant factor that has a direct or indirect impact on results. By overcoming the isoelectric point, the complex formed by the interaction of the inorganic pollutant and organic coagulant may aid in the removal of arsenic at pH 9 and 8. P.lunatus and P.vulgaris had optimised arsenic initial concentrations of 57.1µg/L and 42.6µg/L, respectively. The coagulation mechanism is more prevalent in water treatment, as shown by the above findings.

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Study of PFS and PAC coagulation effect on Pi River water

E3S Web of Conferences ◽

10.1051/e3sconf/202127201012 ◽

2021 ◽

Vol 272 ◽

pp. 01012

Author(s):

Wan-Fen Wang

Keyword(s):

Water Sample ◽

River Water ◽

Removal Efficiency ◽

Aluminum Chloride ◽

Ph Value ◽

Removal Rate ◽

Raw Water ◽

Mass Ratio ◽

Enhanced Coagulation ◽

Better Than

Using poly-aluminum chloride (PAC) and poly-ferric sulfate (PFS) as coagulants, the effects of the dosage of PAC and PFS on the removal of turbidity, chromaticity and UV254* in water were investigated by using the method of enhanced coagulation. The results show that when the raw water is neutral and the turbidity is less than 20NTU, and the pH value does not decrease much after coagulation and sedimentation, PAC and PFS are separately added to 7.5mg/l, 35mg/l. The removal rate of turbidity and chromaticity in the water sample can reach 83.75% and 48.47%, respectively, but the removal rate of UV254* is less than 30%, the mass ratio of PAC to PFS is 1:1 to 6:1, the removal efficiency of turbidity and Chroma increased by about 10%, but the removal efficiency of UV254* did not change or even decreased, both PFS and PAC can effectively remove the turbidity and Chroma in the micro polluted Pi River, but the removal effect of UV254* is not good, and the removal effect of PAC is better than PFS.

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RESEARCH ON ELECTROCHEMICAL METHODS TO REMOVE FLUORIDE FROM WATER

HUE UNIVERSITY JOURNAL OF SCIENCE NATURAL SCIENCE ◽

10.26459/hueuni-jns.v126i1c.4623 ◽

2017 ◽

Vol 126 (1C) ◽

pp. 85

Author(s):

Võ Anh Khuê

Keyword(s):

Optimal Condition ◽

Removal Efficiency ◽

Water Solution ◽

Electrochemical Methods ◽

Fluoride Ion ◽

Residual Concentration ◽

Initial Concentration ◽

Iron Electrodes ◽

Aluminum Electrodes

<p>The use of electrochemical methods such as micro-electrolysis, electrocoagulation, and micro-electrolysis combined with electrocoagulation to remove fluoride from water were studied in this paper. The results indicated that the micro-electrolysis (using Fe/C particles) and the electrocoagulation (using iron electrodes) are not suitable for removal of fluoride from water solution. The electrocoagulation method with aluminum electrodes for removal efficiency of fluoride is very good. But it is not as good as the micro-electrolysis (using Fe/C particles) combined with the electrocoagulation method (using aluminum electrodes). At the optimal condition of the micro-electrolysis (using Fe/C particles) combined with the electrocoagulation method (using aluminum electrodes) and the initial concentration of fluoride ion of 50 mg/L, the removal efficiency of fluoride ion is 94.03% and the residual concentration is 2.986 mg/L.</p>

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Photocatalytic degradation of 2,4-dichlorophenoxyacetic acid from aqueous solutions by Ag3PO4/TiO2 nanoparticles under visible light: kinetic and thermodynamic studies

Water Science & Technology ◽

10.2166/wst.2021.193 ◽

2021 ◽

Author(s):

Fatemeh Amiri ◽

Mansooreh Dehghani ◽

Zeinab Amiri ◽

Saeed Yousefinejad ◽

Aboolfazl Azhdarpoor

Keyword(s):

Visible Light ◽

Photocatalytic Degradation ◽

Tio2 Nanoparticles ◽

Removal Efficiency ◽

Contact Time ◽

Polluted Water ◽

Dichlorophenoxyacetic Acid ◽

Good Efficiency ◽

Initial Concentration ◽

2,4 Dichlorophenoxyacetic Acid

Abstract Between the countless chemical substances applied in agriculture, 2,4-dichlorophenoxyacetic acid (2,4-D) herbicide is considered as a toxic and carcinogenic pollutant which is difficult to be removed from water due to its biological and chemical stability and high solubility. The goal of this study was photocatalytic degradation of 2,4-D, using Ag3PO4/TiO2 nanoparticles under visible light. The Ag3PO4/TiO2 nanoparticles were characterized using XRD, FESEM and EDS analysis to investigate its crystal structure and elemental compounds. The effect of operating parameters such as pH, contact time, catalyst dose, initial concentration of herbicide on the efficiency of the process was studied. Increasing the pH and initial concentration of herbicide led to the reduction of the efficiency of removing the herbicide while, increasing contact time and catalyst dose increased the efficiency. The best result (98.4% removal efficiency) was achieved at pH = 3, 1 g/L catalyst dose, 60 min contact time, and 10 mg/L initial concentration of 2,4-D. According to the results, 2,4-D removal efficiency with Ag3PO4/TiO2 photocatalyst reached 96.1% from 98.4% after 5 cycles of reaction. The pseudo-first-order kinetics was the best for the 2,4-D degradation by Ag3PO4/TiO2 with correlation coefficients (R2 = 0.9945). The results demonstrated that the photocatalytic process using Ag3PO4/TiO2 nanoparticles in the presence of visible light had a relatively good efficiency in removing 2,4-D. Moreover, Ag3PO4/TiO2 can be used as a reusable photocatalyst for the degradation of such toxins from polluted water and wastewater.

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Research on Treatment Process for Chemical Agent VX Polluted Water by Enhanced Coagulation

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.361-363.785 ◽

2013 ◽

Vol 361-363 ◽

pp. 785-788

Author(s):

Xiao Jie Wang ◽

Xiao Jing Li ◽

Shuang Wang ◽

Yun Zhe Ji

Keyword(s):

Ammonium Chloride ◽

Ferric Chloride ◽

Treatment Process ◽

Removal Rate ◽

Polluted Water ◽

Chemical Agent ◽

Raw Water ◽

Water Turbidity ◽

Enhanced Coagulation ◽

Better Than

The influences of coagulant species, dose, water turbidity, and pollution situation of raw water on the results of enhanced coagulation have been investigated targeted at water contaminated by chemical agent. Ferric trichloride and polymeric aluminum ferric chloride (PAFC) acted as coagulant, poly dimethyl diallyl ammonium chloride (HCA) worked as coagulant aid and paraoxon acted as simulation agent of chemical agent VX in this process. The results show that: enhanced coagulation process cannot remove effectively chemical agent (paraoxon) in raw water; the result of treatment by PAFC and PAFC+HCA is better than that by FeCl3 and FeCl3+HCA; the addition of certain amount of HCA based on the condition that coagulant has been added will improve removal rate of both chemical agent and turbidity; the bigger the turbidity of raw water is, the higher the removal rate of paraoxon will be.

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Comparative Bio-sorption of Cadmium and Nickel Ions from Aqueous Solution onto Fibers of Date Palm using Fluidized Bed Column

Revista de Chimie ◽

10.37358/rc.19.5.7160 ◽

2019 ◽

Vol 70 (5) ◽

pp. 1507-1512

Author(s):

Baker M. Abod ◽

Ramy Mohamed Jebir Al-Alawy ◽

Firas Hashim Kamar ◽

Gheorghe Nechifor

Keyword(s):

Aqueous Solution ◽

Heavy Metal ◽

Metal Ions ◽

Fluidized Bed ◽

Removal Efficiency ◽

Heavy Metal Ions ◽

Date Palm ◽

Operating Conditions ◽

Initial Concentration ◽

Bed Height

The aim of this study is to use the dry fibers of date palm as low-cost biosorbent for the removal of Cd(II), and Ni(II) ions from aqueous solution by fluidized bed column. The effects of many operating conditions such as superficial velocity, static bed height, and initial concentration on the removal efficiency of metal ions were investigated. FTIR analyses clarified that hydroxyl, amine and carboxyl groups could be very effective for bio-sorption of these heavy metal ions. SEM images showed that dry fibers of date palm have a high porosity and that metal ions can be trapped and sorbed into pores. The results show that a bed height of 6 cm, velocity of 1.1Umf and initial concentration for each heavy metal ions of 50 mg/L are most feasible and give high removal efficiency. The fluidized bed reactor was modeled using ideal plug flow and this model was solved numerically by utilizing the MATLAB software for fitting the measured breakthrough results. The breakthrough curves for metal ions gave the order of bio-sorption capacity as follow: Cd(II)]Ni(II).

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