Optimization of Pitch Removal by Dissolved Air Flotation in a Eucalyptus Kraft Mill

Negro, Carlos; Blanco, A.; Saarimaa, Ville; Tijero, J.

doi:10.1081/ss-200048173

Cited by 12 publications

(16 citation statements)

References 15 publications

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“…The data can be used to analyze the flocs properties and the flocculation mechanisms allowing the selection of both the best chemicals and the optimal chemical dosages [26]. FBRM technique has been previously used for the chemical optimization of the DAF treatments in papermaking processes [8][9][10][27][28][29].…”

Section: Methodsmentioning

confidence: 99%

Efficiency of chitosans for the treatment of papermaking process water by dissolved air flotation

Miranda

Nicu

Latour

et al. 2013

Chemical Engineering Journal

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Interest has grown in bio-polymers as being environmental friendly alternatives to synthetic additives. In this work, two native chitosans with different molecular weights have been evaluated on a laboratory scale for their effectiveness for the removal of contaminants from papermaking process waters by dissolved air flotation (DAF). The use of chitosan quaternary derivatives and the use of the native chitosans in combination with anionic bentonite microparticles have also been tested. Results demonstrate a high efficiency of the native chitosan products at intermediate dosages and furthermore, their efficiency is enhanced by the combined addition of bentonite. For an equivalent removal of contaminants, the required dosage of chitosan is about half that the dosage required in absence of bentonite. Quaternary derivatives have not improved the efficiency of the native chitosan in this case. The optimum treatment would be 50 mg/L of native chitosan and 100 mg/L of bentonite where this treatment is capable of the removal of 83-89% turbidity (residual turbidity 210-320 NTU), 68-71% dissolved turbidity (residual dissolved turbidity of 22-24 NTU), 18-22% total solids (residual total solids of 2750-2900 mg/L) and 19-23% COD (1440-1525 mg/L). The low molecular weight native chitosan is more efficient than the medium molecular weight chitosan in all cases. The Focused Beam Reflectance Measurement (FBRM) is used to assess the aggregation process and to predict the separation efficiency of DAF units either with single or dual systems. The efficiency predicted through the FBRM technique is very similar to that obtained later in the DAF tests.

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Section: Methodsmentioning

confidence: 99%

Efficiency of chitosans for the treatment of papermaking process water by dissolved air flotation

Miranda

Nicu

Latour

et al. 2013

Chemical Engineering Journal

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“…Flocculation performance can be monitored on-line, allowing a continuous assessment and insights into flocculation mechanisms (Rasteiro et al 2008;Blanco et al 2002a,b). This approach has been used to optimize dissolved air flotation systems for pulp and paper mills (Negro et al 2005;Saarimaa et al 2006a,b;Miranda et al 2008Miranda et al , 2009bMiranda et al , 2013.…”

Section: Enhanced Clarification Dosage Optimizationmentioning

confidence: 99%

Wastewater Treatment and Reclamation: A Review of Pulp and Paper Industry Practices and Opportunities

Hubbe

Metts

Hermosilla

et al. 2016

BioRes

194

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The pulp and paper (P&P) industry worldwide has achieved substantial progress in treating both process water and wastewater, thus limiting the discharge of pollutants to receiving waters. This review covers a variety of wastewater treatment methods, which provide P&P companies with costeffective ways to limit the release of biological or chemical oxygen demand, toxicity, solids, color, and other indicators of pollutant load. Conventional wastewater treatment systems, often comprising primary clarification followed by activated sludge processes, have been widely implemented in the P&P industry. Higher levels of pollutant removal can be achieved by supplementary treatments, which can include anaerobic biological stages, advanced oxidation processes, bioreactors, and membrane filtration technologies. Improvements in the performance of wastewater treatment operations often can be achieved by effective measurement technologies and by strategic addition of agents including coagulants, flocculants, filter aids, and optimized fungal or bacterial cultures. In addition, P&P mills can implement upstream process changes, including dissolved-air-flotation (DAF) systems, filtration save-alls, and kidney-like operations to purify process waters, thus reducing the load of pollutants and the volume of effluent being discharged to end-of-pipe wastewater treatment plants. Keywords: Wastewater treatment; Pulp and paper manufacturing; Advanced oxidation; Membrane technologies; Clarification; Activated sludgeContact information: a: North Carolina State University, Dept. of Forest Biomaterials, Campus Box 8005, Raleigh, NC 29695-8005; b: WestRock Company, Water and Waste Treatment, 600 S 8th St, Fernandina Beach, FL 32034; c: Department of Agricultural and Forestry Engineering, University of Valladolid, Campus Duques de Soria, E-42004 Soria, Spain; d: Complutense University of Madrid, Department of Chemical Engineering, Ingn. Quim, Facultad de Ciencias Químicas, Ciudad Universitaria s/n,S-N, E-28040 Madrid, Spain; e: Concordia University, Dept. Bldg. Civil & Environm. Engn., 1455 Maisonneuve Blvd, West Montreal, PQ H3G 1M8, Canada; f: University of Jyväskylä, Dept. Chem., Box 35, FI-40014 Jyväskylä, Finland; g: Department of Biology, Center for Environmental and Marine Studies, CESAM, University of Aveiro, 3810-193 Aveiro, Portugal; h: Department of Environment and Planning, Center for Environmental and Marine Studies, CESAM, Aveiro & Department of Materials and Ceramics, Institute of Materials, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal; i: FPInnovations, 570 St. Jean Blvd., Pointe Claire, PQ H9R 3J9, Canada; * Corresponding author: hubbe@ncsu.edu Contents of the Article INTRODUCTIONThe pulp and paper (P&P) industry occupies a challenging position with respect to the natural environment. On the positive side, the industry is based on the usage of renewable, photosynthetic resources. On the other hand, the industry discharges huge quantities of aqueous effluents. Large volumes (up to 70 m 3 ) of wastewater ...

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“…Miranda et al (2008 and describe the application of the dissolved air flotation to purify the process water from paper mill producing newsprint from 100% recovered paper, where lipophilic extractives are aggregated with the help of cationic polyelectrolytes and are then removed in the flotation process. Negro et al (2005) show that the aggregation of the lipophilic extractives with a cationic polyelectrolyte and dissolved air flotation (DAF) can be used successfully in the purification of eucalyptus process water as well. Controlling the pitch by additions of cationic polyelectrolytes may introduce limitations in the further utilization of the removed material due to the fact that polyelectrolyte adsorption is, in general, irreversible (Holmberg et al 2002).…”

Section: Introductionmentioning

confidence: 99%

Removal of lipophilic extractives and manganese ions from Spruce TMP waters in a customized flotation cell

Zasadowski¹,

Hedenström²,

Edlund³

et al. 2012

BioResources

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The influence of a chelating surfactant, different foaming agents, cationic polyelectrolytes, pH value, and temperature on the purification efficiency of process waters from a mechanical pulp mill has been studied by flotation in a 1 L customized unit. Turbidity measurements and gas chromatography (GC) were carried out to determine the removal and characteristics of dissolved and colloidal substances (DisCo). The manganese ion content in the process waters before flotation and the metal chelate removal capacity by flotation were determined by Inductively Coupled Plasma (ICP) and Atomic Absorption Spectrometry (AAS) measurements. It was found that a 99% removal of complex bound manganese ions and a 94% decrease in turbidity of the TMP water produced at the laboratory can be achieved in a single-stage flotation with a chelating surfactant and a foaming agent. Furthermore, a 91% decrease in turbidity, the removal of up to 96% of resin and fatty acids, and 93% of triglycerides from TMP water can be obtained after application of a foaming agent.

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Optimization of Pitch Removal by Dissolved Air Flotation in a Eucalyptus Kraft Mill

Cited by 12 publications

References 15 publications

Efficiency of chitosans for the treatment of papermaking process water by dissolved air flotation

Efficiency of chitosans for the treatment of papermaking process water by dissolved air flotation

Wastewater Treatment and Reclamation: A Review of Pulp and Paper Industry Practices and Opportunities

Removal of lipophilic extractives and manganese ions from Spruce TMP waters in a customized flotation cell

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