scholarly journals Immobilization of Powdered Coal Fly Ashes (CFAs) into CFA Beads and Column Studies on Color Removal from Pulp Mill Effluents Using These CFA Beads

2020 ◽  
Author(s):  
Musfiques Salahin ◽  
George Yuzhu Fu
Keyword(s):  
Pulp Mill ◽  
Breakthrough Curves ◽  
Color Removal ◽  
Column Studies ◽  
Column Study ◽  
Wide Range ◽  
Coal Fly Ashes ◽  
Powdered Coal ◽  
Pulp Mill Effluents ◽  
Operational Time

In this study, immobilization process of the three (3) powder CFAs was studied. The major results on immobilization process were briefly presented. A total number of fifteen (15) column studies from the combination of the five (5) types of CFAs beads and the three (3) PMEs samples were performed. In each column study, a set of aggregate parameters of flow rate, empty bed contract time, operational time, and throughput volume was studied, and the data was fitted to existing modeling of breakthrough curves. The overall operational time was 12–24-hour, color removal efficiencies were 40–90%, and throughput volume of treated PMEs was 10–14 bed volume. For the column study, the correlation coefficient R2 value for each combination indicated that the Thomas model had a better fit with the observed data than the Adams-Bohart model, and the color adsorption capacities of CFA beads varied in a wide range of 0.31–28.23 mg/g.

The Onset of Lignin-Modifying Enzymes, Decrease of AOX and Color Removal by White-Rot Fungi Grown on Bleach Plant Effluents

1991 ◽  
Vol 24 (3-4) ◽  
pp. 189-198 ◽  
Author(s):  
V. P. Lankinen ◽  
M. M. Inkeröinen ◽  
J. Pellinen ◽  
A. I. Hatakka
Keyword(s):  
Lignin Peroxidase ◽  
Active Form ◽  
White Rot Fungi ◽  
Pulp Mill ◽  
Color Removal ◽  
Effluent Treatment ◽  
White Rot ◽  
White Rot Fungus ◽  
Lignin Peroxidases ◽  
Pulp Mill Effluents

Decrease of adsorbable organic chlorine (AOX) is becoming the most important criterion for the efficiency of pulp mill effluent treatment in the 1990s. Two methods, designated MYCOR and MYCOPOR which utilize the white-rot fungus Phanerochaete chrysosporium have earlier been developed for the color removal of pulp mill effluents, but the processes have also a capacity to decrease the amount of chlorinated organic compounds. Lignin peroxidases (ligninases) produced by P. chrvsosporium may dechlorinate chlorinated phenols. In this work possibilities to use selected white-rot fungi in the treatment of E1-stage bleach plant effluent were studied. Phlebia radiata. Phanerochaete chrvsosporium and Merulius (Phlebia) tremellosus were compared in shake flasks for their ability to produce laccase, lignin peroxidase(s) and manganese-dependent peroxidase(s) and to remove color from a medium containing effluent. Softwood bleaching effluents were treated by carrier-immobilized P. radiata in 2 1 bioreactors and a 10 1 BiostatR -fermentor. Dechlorination was followed using Cl ion and AOX determinations. All fungi removed the color of the effluent. In P. radiata cultivations AOX decrease was ca. 4 mg l−1 in one day. Apparent lignin peroxidase activities as determined by veratryl alcohol oxidation method were negligible or zero in a medium with AOX content of ca. 60 mg l−1, prepared using about 20 % (v/v) of softwood effluent. However, the purification of extracellular enzymes implied that large amounts of lignin peroxidases were present in the medium and, after the purification, in active form. Enzyme proteins were separated using anion exchange chromatography, and they were further characterized by electrophoresis (SDS-PAGE) to reveal the kind of enzymes that were present during AOX decrease and color removal. The most characteristic lignin peroxidase isoenzymes in effluent media were LiP2 and LiP3.

Process parameter development for ozonation of kraft pulp mill effluents

1997 ◽  
Vol 35 (2-3) ◽  
pp. 251-259 ◽  
Author(s):  
Zhou Hongde ◽  
Daniel W. Smith
Keyword(s):  
Kraft Pulp ◽  
Film Theory ◽  
Pulp Mill ◽  
Pilot Scale ◽  
Absorption Efficiency ◽  
Operating Conditions ◽  
Kraft Pulp Mill ◽  
Adsorbable Organic Halides ◽  
Wide Range ◽  
Pulp Mill Effluents

Wastewaters discharged from the aerated lagoon basin of a kraft pulp mill were ozonated using both bench scale and pilot scale fine bubble contactors. Effects of contactor scaling-up on ozonation effectiveness were examined by comparing the removal efficiencies of color, AOX (adsorbable organic halides) and other wastewater characteristics. The absorption efficiency of ozone was determined by monitoring the exit off-gas ozone over a wide range of operating conditions. Overall mass transfer coefficient (kLa) and its enhancement factor due to the occurrence of rapid ozone decay reactions (E) were then quantified by applying the two-film theory to an irreversible gas-liquid reaction. Results showed that ozone was very effective in oxidizing color and AOX-causing compounds. The effectiveness could be simply related to the amount of utilized ozone alone, regardless of the variations in gas flowrate, inlet ozone concentration, and contactor configurations. In contrast, the ozone absorption was affected by both operating conditions and wastewater characteristics. Its rate might be enhanced substantially due to the presence of ozone decay reactions, particularly in the cases of occurring rapid ozone decay reactions. Accordingly, a relationship was developed to describe the dynamic changes of EkLa values versus the utilized ozone.

A solid-phase extraction method that eliminates matrix effects of complex pulp mill effluents for the analysis of lipophilic wood extractives

2020 ◽  
Vol 35 (4) ◽  
pp. 577-588
Author(s):  
Sebastian España Orozco ◽  
Philipp Zeitlinger ◽  
Karin Fackler ◽  
Robert H. Bischof ◽  
Antje Potthast
Keyword(s):  
Solid Phase Extraction ◽  
Matrix Effects ◽  
Solid Phase ◽  
Internal Standard ◽  
Pulp Mill ◽  
Phase Extraction ◽  
Wood Extractives ◽  
Wood Extractive ◽  
Pulp Mill Effluents ◽  
The Impact

AbstractThe extraction of lipophilic wood extractives from pulp and paper process waters proves to be a challenging task, due to harsh and alternating process and sample conditions. This study has determined the potential use of polymeric sorbents for solid-phase extraction (SPE) and compared to classical silica-based reversed-phase packed columns, with polymeric hydrophilic-lipophilic balanced (HLB) cartridges being the sorbent with the most potential. Recovery functions were obtained with an internal standard mixture representative for the main lipophilic wood extractive groups, which are fatty acids and alcohols, sterols, sterol esters and triglycerides. The impact of pH, sample volume and sample matrix, expressed as TOC and cations, on the retention behavior of lipophilic extractives during SPE of industrial samples were determined with polymeric HLB sorbent. High variations in the composition of pulp mill matrices led to different optimal extraction conditions. Thus, a new SPE protocol was developed, which bypasses matrix interferences and omits the loss of analytes due to sample preparation. The method is applicable to different pulp mill effluents with large discrepancies in pH and sample matrices, resulting in recoveries >90 % with RSD <5 % for all lipophilic wood extractives.

Avoidance by herring of dissolved components in pulp mill effluents

1977 ◽  
Vol 18 (5) ◽  
pp. 521-525 ◽  
Author(s):  
D. J. Wildish ◽  
H. Akagi ◽  
N. J. Poole
Keyword(s):  
Pulp Mill ◽  
Pulp Mill Effluents ◽  
Dissolved Components

scholarly journals STEROIDAL METABOLITES IN CHILEAN RIVER SEDIMENTS INFLUENCED BY PULP MILL EFFLUENTS

2013 ◽  
Vol 58 (4) ◽  
pp. 2035-2037 ◽  
Author(s):  
V HERNÁNDEZ ◽  
M. N EBERLIN ◽  
S CHAMORRO ◽  
J BECERRA ◽  
M SILVA
Keyword(s):  
River Sediments ◽  
Pulp Mill ◽  
Pulp Mill Effluents

Purification of pulp mill condensates by an adsorptive process on activated carbon

Holzforschung ◽  
2019 ◽  
Vol 73 (6) ◽  
pp. 589-597 ◽  
Author(s):  
José A.F. Gamelas ◽  
Sofia M. Rebola ◽  
Margarita G. Evtyugina ◽  
Valdemar I. Esteves ◽  
Dmitry V. Evtuguin
Keyword(s):  
Activated Carbon ◽  
Volatile Compounds ◽  
Water Cycle ◽  
Black Liquor ◽  
Pulp Mill ◽  
Dimethyl Disulfide ◽  
Pulp Mills ◽  
Wide Range ◽  
New Process ◽  
Pseudo Second Order

Abstract In order to close the water cycle in pulp mills with condensates instead of fresh water, the malodorous/hazardous volatile compounds and colored substances have to be removed by appropriate efficient methods. In the present work, the condensate from the evaporation of black liquor (BL) from a kraft mill was purified by a batch adsorptive process by means of commercial activated carbon (AC). The effluent was found to contain a wide range of aromatic and organosulfur volatile compounds, including toluene, ethylguaicol, syringaldehyde, dimethyl disulfide (DMDS), dimethyl trisulfide (DMTS), 2,3-dimethylthiophene, benzothiol and benzothiophene derivatives. Methanol was the major volatile organic component in the condensate (201 mg l−1), which was, however, poorly adsorbed on the AC surface. Aromatics and organosulfur contaminants were adsorbed almost completely in 2–5 min at 23°C under the optimized AC load (900 mg l−1). The treatment allowed the elimination of up to 99% of the obnoxious odor, color and turbidity of the condensate. The adsorption equilibrium followed the Langmuir model and the pseudo-second-order kinetics. The new process could be incorporated in the pulp mill with relatively low additional reagent costs.

Ozonation of kraft pulp mill effluents: process dynamics

2002 ◽  
Vol 1 (1) ◽  
pp. 45-57 ◽  
Author(s):  
M G El-Din ◽  
Daniel W Smith
Keyword(s):  
Kraft Pulp ◽  
Pulp Mill ◽  
Kraft Pulp Mill ◽  
Process Dynamics ◽  
Pulp Mill Effluents
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