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excellent manufacturers of study on optimal conditions of poly ferric chloride in china

  • Study on optimal conditions of poly ferric chloride (PFC ...

    2021-1-1 · Poly ferric chloride (PFC) solution with general formula [Fe 2 (OH) nCl 6-n] m when dissolved will produce 4 polymer particles: Fe 2 (OH) 2 4+, Fe 3 (OH) 4 5+, Fe x (OH) y (3x-y) + and Fe x O y (OH) x + r (2x-2y-r). is supplied by Saigon Green Environment & Construction Co. Ltd in Tan Phu District, Ho Chi Minh City. The tested PFC has been prepared to use as the …

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  • Optimization of coagulation with ferric chloride as a ...

    2017-8-1 · Optimal conditions for coagulation were 5.58 pH and 26.38 mg L −1 of Fe 3+. • Coagulation and sand filtration pretreatment reduced membrane fouling 4 to 19 times. • Membrane fouling after coagulation and sand filtration was mostly reversible.

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  • The removal of COD, TSS and colour of black liquor by ...

    2017-5-1 · Combination of Ferric chloride, PAC and cationic polymer was excellent in COD reduction and reduced more than 81% of COD as well as 95% TSS. This combination was not found to be good in case of colour reduction which might be due to the presence of ferric chloride that induces its own colour at little higher dosing rate.

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  • Feasibility and optimization of wastewater treatment by ...

    2020-11-17 · Regarding the aim of our study, the experiment was divided into two phases. Batch tests were applied to select an optimal chemical coagulant from polyalumin-ium chloride (PAC), polyaluminium ferric chloride (PAFC), poly ferric sulfate (PFS) (individual or couple with poly acrylamide [PAM]) during the first phase. At the second

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  • Synthesis and evaluation of cationic flocculant P(DAC ...

    1 College of Urban Construction, Nanjing Tech University, Nanjing 211800, China. 2 College of Urban Construction, Nanjing Tech University, Nanjing 211800, China. Electronic address: [email protected] 3 School of Environmental Sciences and Engineering, Nanjing Tech University, Nanjing 211816, China.

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  • Mechanistic insights into the effect of poly ferric ...

    2021-2-1 · Poly ferric sulfate (PFS), the polymerized iron salts, can provide a variety of nucleic hydroxyl high-valence complex ions and hydrolyze to the highly cross-linked hydrophobic multinucleate and multichain-hydroxyl polymers after dissolving in aqueous phase, making it possess the high coagulation efficiency (Jiang et al., 1998; Zouboulis et al., 2008).

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  • Characteristic of silver nanowires prepared by polyol ...

    2021-5-18 · ferric chloride (FeCl 3) were purchased from Sinopharm Chemical Reagent Co. Ltd. Poly(N-vinylpyrrolidone) (PVP K88-96, Mw&1,300,000) and sodium chloride (NaCl) were purchased from Aladdin. Oil bath was obtained from Gongyi Yuhua Instrument Co. Ltd. Injection pump was obtained from Jianyuan Medical Co. Ltd. High-speed cen-

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  • Novel insight into sludge dewaterability mechanism using ...

    2020-3-1 · The main objectives of this study were to: (1) apply response surface methodology (RSM) to determine the optimal operating parameters of the combined PAFC/AMD conditioning and UPFP dewatering process that lead to an optimized water content level in the dewatered cake (Wc); (2) investigate the detailed conditioning and dewatering mechanisms by tracing the sludge, filter …

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  • Application of coagulation/flocculation in oily wastewater ...

    2021-4-15 · With the initial COD concentration increasing up to 17,312 mg/L, the removal efficiency of COD and turbidity could reach above 90% and 99% respectively under optimal conditions. Chen et al. (2007) reported that the electrocoagulation technology was used to treat catering oily wastewater with an oil content of 120–1500 mg/L. The experiment showed that the oil removal …

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  • Characteristic of silver nanowires prepared by polyol ...

    2021-4-28 · Material. Silver nitrate (AgNO 3, 99.9%), ethylene glycol (EG) and ferric chloride (FeCl 3) were purchased from Sinopharm Chemical Reagent Co. Ltd. Poly(N-vinylpyrrolidone) (PVP K88-96, Mw. Preparation Formulation of orthogonal experiment table: We designed four factors and three-level orthogonal experiment form, as listed in table 1.

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  • ISSN: 0975-766X CODEN: IJPTFI Available Online through ...

    2016-7-24 · The results showed that after using the poly aluminum chloride, ferrous sulfate, ferric chloride and aluminum sulfate coagulants, in the turbidity of 200, 100, 50, 20, 10 NTU, the pH level have reduced in a way that by increasing each mg/l poly aluminum chloride, ferrous sulfate, ferric chloride about 0.01 unit pH have reduced.

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  • Characteristic of silver nanowires prepared by polyol ...

    2021-5-18 · In this study, silver nanowires (AgNWs) were prepared by the polyol method using silver nitrate (AgNO ... of ferric chloride (FeCl 3), and the AgNWs exhibit optimal morphology with the diameter ranging from 60 to 200 nm. The ... In order to obtain the optimal experimental conditions for the preparation of AgNWs, the orthogonal experiment

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  • Optimal conditions of Al and Fe extraction from laterite ...

    2012-8-9 · This paper reports pioneering work in identifying an alternative coagulation agent of wastewater treatment, given the availability of commonly used agents are of a higher cost relative to more natural sources, such as soil. The alternative proposed is laterite soil from northern Malaysia because it contains high amounts of Al and Fe, which are well-known coagulants.

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  • Treatment of primary effluent by coagulation–adsorption ...

    2019-11-7 · and ferric chloride on a raw wastewater. Percentages of reduction are 83.3 for turbidity, 75 for BOD and 78% for the COD for a concentration of FeCl 3 equal to 300 mg/l and 400 mg/l of Al 2 (SO 4) 3 with an optimum pH = 4.8. Al Malack and Anderson [2] determined the coagulation optimal conditions of raw wastewater with a concentration of 200 mg ...

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  • Characterization of an inorganic polymer coagulant and ...

    The pH of water always influences the coagulation performance significantly. 16 It has been reported that organic matter can be better treated under acidic condition than under neutral and alkaline conditions. 28 However, in this study, the optimal pH for the treatment of HA/algae-polluted water was between 6 and 9.

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  • A facile preparation of immobilized naringinase on ...

    2.3 Preparation of immobilized naringinase An amount of 0.2 g of Fe 3 O 4-PEI material was mixed with 2 mL of naringinase fermentation broth, and then 6 mL of citrate buffer was added to adjust the pH to 4.5.Then 1 mL of glutaraldehyde was added for cross-linking. In addition, the mixture was shaken at a constant temperature of 160 rpm for 4 hours, and was separated by magnet …

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  • Applied and Environmental Microbiology Journal Homepage

    2011-3-8 · Applied and Environmental Microbiology Article September 2020. 3-Hydroxypyridine Dehydrogenase HpdA Is Encoded by a Novel Four-Component Gene Cluster and Catalyzes the First Step of 3-Hydroxypyridine Catabolism in Ensifer adhaerens HP1. Haixia Wang, Xiaoyu Wang, Hao Ren, Xuejun Wang and.

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  • Chemical Compatibility Guide - Pumping Solutions, Inc.

    2015-12-31 · duplicate conditions. Chemical resistance of materials can vary widely, and is affected by factors such as temperature, aeration, oxidizing agents and fluid movement. Material chemical compatibility is considered to be for materials between room temperature and 120°F unless otherwise specified. 5-1 thru 5-28 10/7/98 9:09 AM Page 5-2

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  • Controlling gelation time of in situ polymerization of gel ...

    2020-2-14 · To better control the gelation time of in situ polymerization of gel system in reservoir, an activator regenerated by AGET (activator generated by electron transfer) ATRP (atom transfer radical polymerization) initiating system was developed. The AGET ATRP initiating system was composed of an initiator 1,2-dibromoethane, a catalyst ferric chloride and a reducing agent …

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  • Immobilized Microbial Catalytic Oxidation Preparation and ...

    2019-3-19 · A novel inorganic polymer flocculant, biopolymeric ferric sulfate (BPFS), was prepared by immobilization technology of microorganisms and by oxidation of ferrous sulfate using domestic Thiobacillus ferrooxidans ( T. f ) under acidic condition. T. f was isolated on the agarose single-plate medium, which exhibited an unusual trait on the utilization of low concentration of the nitrogen …

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  • Immobilized Microbial Catalytic Oxidation Preparation and ...

    2019-3-19 · A novel inorganic polymer flocculant, biopolymeric ferric sulfate (BPFS), was prepared by immobilization technology of microorganisms and by oxidation of ferrous sulfate using domestic Thiobacillus ferrooxidans ( T. f ) under acidic condition. T. f was isolated on the agarose single-plate medium, which exhibited an unusual trait on the utilization of low concentration of the nitrogen …

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  • WKLRSKHQH QDQRILEHUVRQFDUERQ Ka Yeung Terence

    2019-6-9 · In this study, an evaporative vapor-phase polymerization approach was employed to fabricate vertically aligned poly(3, 4-ethylenedioxythiophene)(PEDOT) nanofibers on the surface of carbon cloth (CC). Optimized reaction conditions can obtain well distributed and uniform layers of high-aspect-ratio PEDOT nanofibers on CC.

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  • XVIIth World Congress of the International Commission of ...

    2013-1-16 · chloride (CHPTMA) using pre-drying dry process. Through the orthogonal test, the optimal conditions for preparing the cationic starch with high DS were: cationic etherifying agent dose 55% of starch (dry base), the mole ratio of NaOH to etherification substance is1, reaction temperature is 85°, reaction time is 5 h, getting

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  • UV-Initiated Polymerization of Cationic Polyacrylamide ...

    2.1. Experimental Material and Instruments. The acrylamide (AM) (Chongqing Lanjie Tap Water Company, Chongqing, China), butyl acrylate (BA) (Tianjin Guangfu Fine Chemical Research Institute, Tianjin, China), acryloyloxye-thyltrimethyl ammonium chloride (DAC, 80% in water) (Guangchuangjing IMP. EXP. Co., Ltd., Shanghai, China), and the photoinitiator 2,2′-azobis(2 …

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  • Preparation of GO/MIL-101(Fe,Cu) composite and its ...

    2021-5-13 · In this study, MIL-101(Fe), MIL-101(Fe,Cu), and graphene oxide (GO)/MIL-101(Fe,Cu) were synthesized to compose a novel sorbent. The adsorption properties of these three MOF-based composites were compared toward the removal of phosphate. Furthermore, the influencing factors including adsorption time, pH, temperature, and initial concentration on the adsorption capacity …

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  • Indicator-Free Argentometric Titration for Distance-Based ...

    2021-2-26 · Chloride solution (100 mg L –1) was used to study the effect of volume of chloride solution on the length of the white-colored band by keeping the volume and concentration of silver nitrate constant at 7.5 μL and 0.1 mol L –1, respectively. Figure 4 shows that the length of the white-colored band increased with volume in a range of 15–45 ...

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  • Magnetic nanowires in biomedical applications - IOPscience

    2020-7-29 · Core shell NWs was also synthesized by dissolving 3 g of Ferric chloride hexahydrate (FeCl 3.6H 2 O) in 1000 ml of DI water to form ferric solution [61, 114]. NaBH 4 solution was formed by adding 6 g of NaBH 4 added to 400 ml of DI water.

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  • Studies of hydrolyzed aluminum chloride solutions. 1 ...

    2019-5-26 · Study on chemical speciation in aluminum chloride solution by ESI-Q-MS. Journal of Mass Spectrometry 2007, 42 (5) , 591-597. DOI: 10.1002/jms.1188. Yongqiang Yang, Daling Yang, Shouhai Zhang, Fajie Yang, Xigao Jian.

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  • Application of TiO 2 -organobentonite modified by ...

    2016-6-13 · This study investigated the treatment performance for aging leachate containing refractory organic pollutants by TiO 2-organobentonite photocatalyst combined with polyaluminum chloride (PAC) coagulant.TiO 2 was immobilized on organobentonite granules as a supporter modified by cetyltrimethylammonium chloride (CTAC). The prepared catalysts were …

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  • Everything You Need to Know About Nicotinamide Riboside ...

    2021-1-22 · Nicotinamide Riboside Chloride or Niagen is the crystal form of Nicotinamide Riboside, which is an NAD+ precursor vitamin. While Nicotinamide Riboside weighs 255.25 g/mol, Nicotinamide Riboside Chloride weighs 290.70 g/mol and 100 mg of Nicotinamide Riboside Chloride provides 88 mg of Nicotinamide Riboside.

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  • Discussions of Fluorescence in Selenium Chemistry ...

    2021-1-28 · Also, a methylene blue assay was invoked. H 2 S reacts with p–aminodimethylaniline, in the presence of zinc acetate and ferric chloride to help generate methylene blue . In the report from Ecker et al. cellular toxicities of three selenium–containing molecules, along with AZT (used as a reference molecule), were tested and compared.

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  • Polycyclic Aromatic Hydrocarbons: Sources, Toxicity, and ...

    2020-11-5 · Polycyclic Aromatic Hydrocarbons: Physico-chemical Properties, Sources of Pollution, and Routes of Exposure. Polycyclic aromatic hydrocarbons are organic pollutants and composed of two or more fused aromatic rings of carbon and hydrogen atoms, which are primarily colorless, white, or pale yellow solid compounds (Abdel-Shafy and Mansour, 2016; Suman et al., 2016).

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  • High Thermoelectric Power Factor of a Diketopyrrolopyrrole ...

    2017-3-20 · Thermoelectric properties. To obtain the optimal thermoelectric performance of conjugated polymers, their doping levels should be accurately controlled 11,12,13,14,15,16,17.In this study…

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  • Graphene and Its Industrial Applications – A Review

    2020-10-1 · Graphene has been recently introduced as a promising material for various applications due to its outstanding mechanical, electrical, and thermal properties. It is classified as an allotropic form of carbon with the size of a single layer of graphite. This paper provides an extensive review regarding different critical applications of graphene including three categories namely: energy ...

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  • Nanoparticle-based biosensors for detection of ...

    Tumor-derived extracellular vesicles have emerged as an alternative source of cancer biomarkers in liquid biopsies. Despite their clinical potential, traditional methods for isolation and analysis have hampered their translation into the clinic. The use of nanomaterial-based biosensors can speed up the devel Recent Open Access Articles Journal of Materials Chemistry B Recent Review Articles ...

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  • Application of TiO 2 -organobentonite modified by ...

    2016-6-13 · This study investigated the treatment performance for aging leachate containing refractory organic pollutants by TiO2-organobentonite photocatalyst combined with polyaluminum chloride (PAC) coagulant. TiO2 was immobilized on organobentonite granules as a supporter modified by cetyltrimethylammonium chloride (CTAC). The prepared catalysts were …

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  • MOFzyme: Enzyme Mimics of Fe/Fe-MIL-101 - SCIRP

    2019-6-20 · In this work, metal-organic frameworks (MOFs) Fe-MIL-101 was synthesized by hydrothermal method, and Fe/Fe-MIL-101 with different loadings was prepared. The crystal structure of the Fe/Fe-MIL-101 sample was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and specific surface area measurement (BET). Fe/Fe-MIL-101 was found …

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  • Effect of Synergism Between Carboxylated Poly-l-Lysine

    2021-3-8 · Carboxylated poly-l-lysine (CPLL), an ampholytic polymer, has remarkable cryoprotective properties.It was hypothesized that CPLL will reduce/replace glycerol in extender and improve the freezability of buffalo semen. The objective was to evaluate various combinations of CPLL and glycerol in extenders for any synergism toward cryosurvivability of Nili-Ravi buffalo …

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  • In Vivo Study of the Antibacterial Chitosan/Polyvinyl ...

    Silver nanoparticles have attracted great interests widely in medicine due to its great characteristics of antibacterial activity. In this research, the antibacterial activity and biocompatibility of a topical gel synthesized from polyvinyl alcohol, chitosan, and silver nanoparticles were studied. Hydrogels with different concentrations of silver nanoparticles (15 ppm, 30 ppm ...

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  • Membrane processes - Arabi - 2020 - Water Environment ...

    Pretreatment. Myat et al. conducted a testing study to evaluate the pretreatment of oxidation and coagulation on ceramic microfiltration (CMF) and subsequently reverse osmosis (RO) in an advanced treatment train for water reuse.The use of coagulation with either ozone (O 3) or ultraviolet hydrogen peroxide (UV/H 2 O 2) and coagulation with poly aluminum chloride helped …

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  • Comprehensive reutilization of iron in iron ore tailings ...

    2020-6-23 · A large number of iron ore tailings (IOTs) are produced in steel industry, posing threat to the environment during its storage and disposal. To effectively reutilize Fe in IOTs, we propose a comprehensive utilization scheme: (1) most Fe in IOTs is extracted by concentrated hydrochloric acid to form FeCl3 flocculants; (2) after separation from the FeCl3 flocculants, a small amount of …

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  • Preparation and Conductive and Electromagnetic Properties ...

    2017-3-20 · Thermoelectric properties. To obtain the optimal thermoelectric performance of conjugated polymers, their doping levels should be accurately controlled 11,12,13,14,15,16,17.In this study…

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  • Atomic spectrometry update – a review of advances in ...

    2021-6-3 · In addition to traditional inorganic coagulants and synthetic flocculants including polyaluminium chloride, ferric chloride, and polyacrylamide derivatives …

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  • High Thermoelectric Power Factor of a Diketopyrrolopyrrole ...

    In a further study, this time in Japan, ten major cultivars (Oryza sativa L.) were grown under flooded conditions in a paddy field with low As soil levels or in pots filled with soil containing a high level of As. 144 In the low As soil, the total As ranged from 0.11 to 0.17 mg kg −1, with a mean concentration of 0.14 mg kg −1, and iAs was ...

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  • Evaluation of hydrophobically associating cationic starch ...

    2020-1-31 · The sustainability of nitrile glove production process is essential both in the financial and energy perspective. Nitrile glove has the lowest material cost with positive mechanical and chemical performance quality for the disposable glove market. Nitrile glove also holds a major market in disposable gloves sector, and nitrile rubber compounds may contribute to the huge …

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  • Atomic spectrometry update. Elemental speciation - Journal ...

    The zeolite A product can be prepared using HAFA with the optimal conditions of the alkali fusion temperature at 850 °C, the Si/Al in raw material at 0.8, the alkali concentration in hydrothermal synthesis at 2.5 mol L −1, the crystallizing temperature at 90 °C with 18 h holding time. The surface area of prepared zeolite A product is lower ...

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  • Everything You Need to Know About Nicotinamide Riboside ...

    2021-3-12 · Composite cryogels containing boronic acid ligands are synthesized for effective separation and isolation of bacteria. The large and interconnected pores in cryogels enable fast binding and release of microbial cells. To control bacterial binding, an alkyne-tagged boronic acid ligand is conjugated to azide-functionalized cryogel via the Cu(I)-catalyzed azide–alkyne …

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  • Recent Advances in Nanoscale Metal–Organic Frameworks ...

    2021-1-29 · The acidic conditions induce decomposition of the prepared MOFs DHA-Fe 3 O 4 @[email protected](Fe) (DHA-FCM) and consequently of the drug release (Appendix 2. (entry b). The Fe(III) ions are reduced to Fe(II) ions by ferric reductase, which can then react with DHA, hence supplying ROS and inducing cell death (Fig. 8) [44, 45]. HeLa cells were used for ...

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  • Environmental Science & Technology | Vol 50, No 22

    2016-11-15 · On Listening, Science, and Justice: A Call for Exercising Care in What Lessons We Draw from Flint. Yanna Lambrinidou*. Environmental Science & Technology 2016, 50, 22, 12058-12059 (Letter to the Editor) Publication Date (Web): November 4, 2016. Full text.

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  • The critical role of carbon in marrying silicon and ...

    2019-9-5 · The Si/G/C exhibited a reversible capacity of 736 mAh/g at 500 mA/g and excellent stability over 300 cycles (83.6% capacity retention), which was superior to similar reports in literature. 60, 61 The excellent results came from the AC shell, which relieved the pressure of Si expansion and promoted stability.

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  • Porous ionic liquid polymer: A reusable adsorbent with ...

    2019-7-31 · Under the optimal conditions, correlation coefficient (R 2) was 0.9996 and LOD was 0.1 µg L −1. This method presented the linearity in the concentration range between 0.1–100 µg L …

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  • Enhancing the Antifouling Properties of Poly(vinylidene ...

    2021-3-12 · Poly(vinylidene fluoride) (PVDF, M w ca. 534 000) was purchased from Shanghai 3F New Materials; bovine serum albumin (BSA, M w ca. 66 000) and copper(I) chloride (CuCl, 97%) were supplied by Aladdin Industrial Corporation; n-hexadecane (98.5%) was purchased from Beijing JK-Chemical; N,N,N′,N′,N′-pentamethyldiethylenetriamine (PMDETA, 98% ...

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  • PCR Amplification | An Introduction to PCR Methods |

    Successful RT-PCR also depends on RNA quantity, which may need to be varied to determine the optimal amount. Excellent amplification results can be obtained with the Access and AccessQuick™ RT-PCR Systems using total RNA template levels in the range of 1pg–1μg per reaction (Figure 3) or poly(A)+ RNA template levels in the range of 1pg–100ng.

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  • Sigma-Aldrich - MilliporeSigma | United States

    Our purpose is to solve the toughest problems in life science by collaborating with the global scientific community – and through that, we aim to accelerate access to …

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  • Mineral trioxide aggregate and other bioactive endodontic ...

    Transfer the tubes from ice to a 42°C water bath and heat-shock for 45–60 seconds. Place on ice immediately to cool for 2 minutes. Add 1ml of LB or SOC medium and incubate for 45 minutes at 37°C with shaking (~150rpm). Plate 100–200µl of the transformation mix or an appropriate dilution, onto selection plates.

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  • Subcloning | An Introduction to Subcloning Methods

    2019-4-10 · Herein, a comparative study of various submerged silicon solar cells in diverse environmental conditions is being carried out. This includes the effects of different water environments, spectral ranges, and multiple light sources. Correspondingly, the transmission of solar radiation in water is being analyzed.

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  • 18 F-labeled magnetic nanoparticles for monitoring anti ...

    2019-10-11 · Briefly, poly (acrylic acid) (PAA, 50 wt%, solution in water, MW 1000, Acros, 8 mmol) and anhydrous ferric chloride (FeCl 3, 4 mmol) were dissolved in 30 mL of DEG (diethylene glycol) and heated in a microwave under vigorous stirring. When the temperature reached 220 °C, sodium hydroxide solution (100 mg/mL, 2 mL) which dissolved in DEG was ...

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  • Peroxidase-Like Reactivity at Iron-Chelation Sites in a ...

    2021-3-1 · Peroxidase-Like Reactivity at Iron-Chelation Sites in a Mesoporous Synthetic Melanin. High catalytic activity and substrate specificity make enzymes a rich source of inspiration for catalyst development. Co-opting the advantages of natural materials while tuning them to a modified form and purpose, however, is not a straightforward synthetic task.

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  • IOP Conference Series: Materials Science and Engineering ...

    We report a facile and environmentally friendly solid-state method to prepare mesoporous wollastonite (calcium silicate, CaSiO 3) based composite adsorbent from chicken eggshells and SiO 2 powder as starting materials for food dyes removal, i.e. brilliant blue. The CaSiO 3 particles were prepared using CaCO 3 /SiO 2 molar ratio of 1:5 and 2:5 and calcined at 1100°C.

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  • IOP Conference Series: Materials Science and Engineering ...

    The 2019 2nd International Conference on Manufacturing Technology, Materials and Chemical Engineering (MTMCE 2019), as an international forum aiming at presenting and exchanging technological advances and research results in the broad fields of Manufacturing Technology, Materials and Chemical Engineering, was held at the Kailaixi Hotel (Hubei Yellow Crane Tower …

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  • Environmental Science & Technology | Vol 50, No 22

    2016-11-15 · On Listening, Science, and Justice: A Call for Exercising Care in What Lessons We Draw from Flint. Yanna Lambrinidou*. Environmental Science & Technology 2016, 50, 22, 12058-12059 (Letter to the Editor) Publication Date (Web): November 4, 2016. Full text.

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  • Subcloning | An Introduction to Subcloning Methods

    Transfer the tubes from ice to a 42°C water bath and heat-shock for 45–60 seconds. Place on ice immediately to cool for 2 minutes. Add 1ml of LB or SOC medium and incubate for 45 minutes at 37°C with shaking (~150rpm). Plate 100–200µl of the transformation mix or an appropriate dilution, onto selection plates.

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  • Frontiers | A 40-Marker Panel for High Dimensional ...

    Chegg Study Expert Q&A is a great place to find help on problem sets and study guides. Just post a question you need help with, and one of our experts will provide a custom solution. You can also find solutions immediately by searching the millions of fully answered study questions in …

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  • What Is Polysorbate 80 And Why Should You Avoid It? -

    2021-6-24 · The average fluoride concentration in the filtrate was 5.8 mg F/L where the dose was 1,000 mg/L. The fluoride at 100, 250 and 500 mg/L doses were 9.5, 8.9 and 8.4 mg F/L, respectively. A dose of 1,500 mg/L magnesia and a contact period of 3 hr was required to reduce the fluoride content in the water to 1 mg/L.

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