ph indicator paper Articles

  • pH Adjustment - A Primer

    A brief review of the definition of pH, the pH scale, and some of the chemistry involved in pH Adjustment systems is provided below. For some this may be trivial, yet for many others this may be useful. The information provided below is typical of the background information we provide in our training classes / seminars. By Definition pH is the measure of free hydrogen activity in water and can be ...


    By Digital Analysis Corp.

  • Bioremediation of Effluent the Pulp and Paper Industry

    The treatment of industrial effluent from the paper manufacturing facilities in British Columbia is a major concern because the effluent is discharged into prime salmon habitat in the marine environment (Cross, 1994). High levels of biological oxygen demand (BOD) in the effluent reduce the dissolved oxygen (DO) available to species in the marine environment. In 1988, the Federal Department of ...


  • The Influence of Alkalising Amines on the Film Formation of Oleyldiamine Paper

    Summary The film formation of film forming amines (FFAs), commonly used as corrosion inhibitors in water/steam cycles, has been subject of various studies. However, less is known of the impact of alkalising amines (AA) on the film formation. AAs have a solubilising effect on the FFA and as a consequence might indirectly influence the properties of the ...


    By Kurita

  • Preparation of cationic waste paper and its application in poisonous dye removal

    Cationic paper was prepared by reaction of paper with 2,3-epoxypropyltrimethylammonium chloride in aqueous suspension, and tested as low-cost adsorbent for wastewater treatment. The experimental results revealed that anionic dyes (Acid Orange 7, Acid Red 18, and Acid Blue 92) were adsorbed on the cationic paper nicely. The maximum amount of dye Acid Orange 7 adsorbed on cationic paper was 337.2 ...


    By IWA Publishing

  • Chemical sequential extraction of heavy metals and sulphur in bottom ash and in fly ash from a pulp and paper mill complex

    A five-stage sequential extraction procedure was used to determine the distribution of 11 metals (Cd, Cr, Cu, Mo, Pb, Zn, As, Co, V, Ni, Ba), and sulphur (S) in bottom ash and in fly ash from a fluidized bed co-combustion (i.e. wood and peat) boiler of Stora Enso Oyj Oulu Mill at Oulu, Northern Finland, into the following fractions: (1) water-soluble fraction (H2O); (2) exchangeable fraction ...


    By SAGE Publications

  • Adsorption of hexavalent chromium on dunite

    The paper presents and discusses the effect of various physicochemical parameters (e.g. pH, ionic strength, Cr(VI) initial concentration, amount of the adsorbent, temperature and contact time between metal ion and adsorbent) on the adsorption efficiency of Cr(VI) on dunite in aqueous solutions under atmospheric conditions. Evaluation of the experimental data shows that dunite presents increased ...


    By IWA Publishing

  • Mechanistic study of ozonation of p-nitrophenol in aqueous solution

    Ozonlysis in the treatment of p-nitrophenol solution was studied in this paper. The results indicated that the decomposition of p-nitrophenol was accelerated as the gas flow rate or pH value increased. When gaseous ozone concentration was 20.11 mg/L and pH was 3, after 24 min reaction, the removal rate of p-nitrophenol reached 73.04%, 86.11%, 91.71 % and 95% at the gas flow rate of 32, 40, 48 and ...


    By IOS Press

  • Modeling Strategy for SBR Recovery after Upset

    The paper presents results of treatability study on wastewater highly contaminated with ammonia (800 mg/l), (phenols (300 mg/l), thiocyanate (210 mg/l), and arsenic up to 11 mg/l. The study was conducted in two sequencing batch reactors (SBRs) using biomass from a coke plant. After two months of acclimatization the biomass was able to remove ammonia to below 1 mg/l and phenols and thiocynate ...

  • Leach Tests on Lime-Treated Clays

    This paper describes the design, use, and results of a multiple leach-cell operation to test the changes in permeability and calcium removal of a lime-treated expansive clay under continuous water leaching. Seventy laboratory-prepared lime-treated clay specimens were subjected to continuous accelerated leaching for periods of 45 and 90 days with varying lime contents and compactive moisture ...


    By ASTM International

  • Inactivation of particle-associated Escherichia coli with chlorine dioxide

    In this paper, the inactivation of both free Escherichia coli (FE) and particle-associated E. coli (PAE) with chlorine dioxide (ClO2) were investigated using granular activated carbon effluent water samples. The inactivation rate of FE was higher than that of PAE and the reactivation ratio of PAE was higher than that of FE, indicating the threat of ...


    By IWA Publishing

  • Removal of ammonium from aqueous solutions using the residue obtained from struvite pyrogenation

    This paper reports the results of laboratory studies on the removal of ammonium from aqueous solutions using struvite pyrogenation residues. A series of experiments were conducted to examine the effects of the pyrogenation temperature (90–210 °C) and time (0.5–4 h) on the ammonium release of struvite. In addition, the pyrolysate of struvite produced at different pyrogenation temperatures and ...


    By IWA Publishing

  • Adsorption of 2-methylisoborneol and geosmin by a low-cost hybrid adsorbent synthesized from fly ash and bentonite

    This paper describes the synthesis of a low-cost hybrid adsorbent from activation of fly ash and bentonite to remove 2-methylisoborneol (MIB) and geosmin from water. These substances produce objectionable taste and odor problems at levels as low as 4–10 ng/L and an effective, low-cost method of removal would be useful. The effect of the initial pH, contact time and adsorbent dosage on the ...


    By IWA Publishing

  • Electrochemical degradation of methyl parathion

    This paper describes the degradation of commercially available methyl parathion by electro oxidation using Ti/RuO2 as anode, stainless steel as cathode and sodium chloride as a supporting electrolyte. Experiments were carried out at constant flow rate and various current densities such as 10, 12 and 15 A/dm² and various concentrations of sodium chloride. At regular time ...


    By Inderscience Publishers

  • Implications and remediations of DMAEA-Q type polymer hydrolysis in wastewater treatment plants

    The present paper outlines the impact of hydrolysis occurring in DMAEA-Q type polymers in the dewatering facilities of municipal wastewater treatment plants. Laboratory studies of polymer hydrolysis kinetics were combined with full-scale dewatering experiments to investigate the influence of polymer charge loss on polymer consumption and cake dry matter yields. The results indicate that prolonged ...


    By IWA Publishing

  • Microencapsulation of bacteriophage felix o1 into chitosan-alginate microspheres for oral delivery

    This paper reports the development of microencapsulated bacteriophage Felix O1 for oral delivery using a chitosan-alginate-CaCl2 system. In vitro studies were used to determine the effects of simulated gastric fluid (SGF) and bile salts on the viability of free and encapsulated phage. Free phage Felix O1 was found to be extremely sensitive to ...

  • Characterization and greenhouse evaluation of brazilian calcined nonapatite phosphate rocks for rice

    Little information is available on the agronomic effectiveness of calcined nonapatite phosphate rock (PR) sources containing crandallite minerals in the form of Ca–Fe–Al–P for flooded and upland rice (Oryza sativa L.). We conducted laboratory and greenhouse studies to (i) characterize the mineralogical composition, (ii) investigate the solubility and dissolution behavior, and (iii) evaluate the ...

  • Effect of different carriers and operating parameters on degradation of flax wastewater by fluidized-bed Fenton process

    This investigation evaluates the effectiveness of a fluidized-bed Fenton process in treating flax wastewater. Flax wastewater was taken from a paper-making factory in a secondary sedimentation tank effluent of a paper-making factory in Hebei. The performance of three carriers (SiO2, Al2O3, Fe2O3) used in the reactor was compared, and the effects of ...


    By IWA Publishing

  • An experimental design approach for modeling As(V) adsorption from aqueous solution by activated carbon

    The present paper discusses response surface methodology as an efficient approach for predictive model building and optimization of As(V) adsorption on activated carbon derived from a food industry waste: peach stones. The objectives of the study are application of a three-factor 23 full factorial and central composite design technique for maximizing As(V) removal by produced activated carbon, ...


    By IWA Publishing

  • Water polishing of phenol by walnut green hull as adsorbent: an insight of adsorption isotherm and kinetic

    The present paper aims to investigate water purification of phenol by walnut green hull adsorbent. The surface characteristics of the adsorbent were studied using Fourier transform infra-red (FTIR), scanning electron microscope, and X-ray diffraction (XRD) techniques. The presence of functional groups such as hydroxyl and carbonyl onto walnut green hull surface was proved by FTIR analysis. ...


    By IWA Publishing

  • Removal of ammonium from rare-earth wastewater using natural brucite as a magnesium source of struvite precipitation

    This paper presents a study regarding ammonium removal from rare-earth wastewater by struvite precipitation with natural brucite mineral as a source of magnesium. Experimental results indicated that a pH ranging from 8.5 to 9.5 was the optimum for the removal of ammonium using the soluble form of brucite as a magnesium source. Additionally, when solid brucite was used as a magnesium source as ...


    By IWA Publishing

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