Treatment of Bleachery Effluents from Kraft Mills Pulping Mature Eucalypts

Boyden, Brace H.; Li, X. Z.; Schulz, Terry J.; Hijazin, O.; Peiris, Paul; Bavor, John

doi:10.2166/wst.1994.0719

Cited by 9 publications

(6 citation statements)

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“…The effluent showed a high concentration of organic matter for COD and BOD. The COD values obtained are higher than typical values found in literature ranging from 500 to 1500 mg/L of COD and 200 to 800 mg/L of BOD (Asplund and Germgard, 1991;Boyden et al, 1994;Hertstad-Svard, 1997). Although the concentration of organic matter in the effluent depends on the type of bleaching and dosage of reagents used, the higher values obtained can be attributed to the partial closing of the water circuit within the bleaching process and /or to the low fiber recovery during the process.…”

Section: Resultscontrasting

confidence: 61%

Treatment of Bleach Pulp Mill Effluent by MF‐MBR

Amaral

Lange²,

Borges³

2012

Water Environment Research

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BSTRACT: The types of treatment most commonly used by pulp mills are biological treatments in combination with sedimentation or coagulation/flocculation as pretreatment. The main issues faced by these types of treatment are low efficiency in the removal of organic matter and the loss of aggregate value for the recovered fiber. Therefore, this study aims to evaluate the use of microfiltration (MF) combined with a membrane bioreactor (MBR) for the treatment of bleach pulp mill effluents. The results showed that the use of the MF-MBR system was an excellent alternative for the treatment of bleach pulp mill effluents with an average COD removal of 95%. The microfiltration allowed the recovery of fibers, which can be returned to the production process without losing economic value, and produced a better quality effluent for further treatment in the MBR. The MBR presented high efflciency removal of organic matter. Water Environ. Res., 84, 547 (2012).

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Section: Resultscontrasting

confidence: 61%

Treatment of Bleach Pulp Mill Effluent by MF‐MBR

Amaral

Lange²,

Borges³

2012

Water Environment Research

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“…Effluent treatment results are presented in Table 3. The distribution of COD, BOD and TOC in the LMM and HMM fractions of the treated effluent are presented in removal were comparable to those obtained in well operated biological treatment processes [2,5,[11][12][13]. However, the relatively high removal of COD was not sufficient to meet current the current operating license effluent discharge limits for most Brazilian bleached kraft pulp mills (< 350 mg l -1 ) or the World Bank COD discharge guideline (300 mg l -1 )…”

Section: Filtrate Treatmentsupporting

confidence: 62%

“…Bleaching filtrates, rich in dissolved organic matter, can account for up to 85% of total effluent volume in bleached kraft pulp mills [2,3]. The pollutant loads associated with the organic matter in bleaching filtrates from modern eucalypt bleached kraft mills typically varies from 500 to 1500 mg chemical oxygen demand (COD) l -1 , 200 to 800 mg biochemical oxygen demand (BOD) l -1 and 10 to 20 mg adsorbable organic halides (AOX) l -1 , depending on the bleaching sequence, reagent dosages and degree of fresh water consumption and mill closure [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Potential for Enhancement of Aerobic Biological Removal of Recalcitrant Organic Matter in Bleached Pulp Mill Effluents

Mounteer¹,

Souza²,

Silva³

2007

Environmental Technology

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Increasingly stringent effluent quality limits for bleached kraft pulp mills pose a great challenge to mill wastewater system managers since these limits can require levels of chemical oxygen demand (COD) removal efficiency rarely reported for biological treatment of these types of effluents. The present study was therefore undertaken to better understand the nature of recalcitrant COD in bleached kraft pulp effluents that persists through the biological treatment system. Bleaching effluents from a Brazilian eucalypt bleached kraft pulp mill were collected and treated in a bench-scale sequencing batch reactor. Organic matter in raw and treated effluents was characterized before and after separation into low and high molecular mass fractions. Biological treatment removed 71% of the COD, with 83% removal of the low molecular mass COD but only 36% removal of the high molecular mass COD. Microorganisms capable of degrading the recalcitrant COD were isolated from enrichment cultures of the original activated sludge fed on fractions of the bleaching effluent that presented low biodegradabilities. Use of a microbial consortium composed of ten of these isolates to treat the biologically treated effluent removed a further 12% of the effluent COD, all from the high molecular mass fraction. Results of this research indicate that microorganisms with potential for degrading recalcitrant COD are present in activated sludge, but that these are not metabolically active during normal activated sludge treatment of mill effluents. The use of biological selectors in the treatment system to promote growth of such microorganisms may enhance removal of recalcitrant organic matter.

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“…Depending upon the obtained results of previous study (Boyden et al, 1994), F/M ratio was selected as 0.3 in an activated sludge reactor. As can be shown in Figure 4, COD removal efficiency of the activated sludge reactor obtained from the 24-h treatment period was 61% for untreated wastewater and independently to the ozonation pH, this value was ranged from 68% to 72% for wastewater that contained pre-ozonated CEH and CEHDED effluents, respectively.…”

Section: Biological Treatment Of Bleached Kraft Mill Effluentmentioning

confidence: 99%

Application of Ozonation and Biotreatment for Forest Industry Wastewater

Balcıoğlu

Saraç

Kıvılcımdan

et al. 2006

Ozone: Science & Engineering

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This research is focused on the integrated process for the treatment of bleached Kraft pulp mill effluents. Preozonation of softwood and hardwood combined bleaching effluents at alkaline pH resulted in 50 and 44% COD abatement, respectively. Segregation of highly polluted streams of bleaching process can be recommended to reduce the cost of treatment since the COD removal yield of CEH effluents was higher than combined bleaching effluents. Moreover, biodegradability of CEH effluents in terms of BOD 5 /COD ratio was increased from 0.16 to 0.32. Noticeable color removal was achieved by pre-ozonation of the CEH stage and combined bleaching effluents. Preozonation enhanced the performance of subsequent algal treatment in the sequential batch reactor (SBR) and activated sludge treatment. Algae have a higher ability to degrade AOX producing compounds together with a high COD removal rate. Although pre-ozonation increased the abatement rate of COD of SBR, the AOX removal rate remained constant as 87%.

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Treatment of Bleachery Effluents from Kraft Mills Pulping Mature Eucalypts

Cited by 9 publications

References 0 publications

Treatment of Bleach Pulp Mill Effluent by MF‐MBR

Treatment of Bleach Pulp Mill Effluent by MF‐MBR

Potential for Enhancement of Aerobic Biological Removal of Recalcitrant Organic Matter in Bleached Pulp Mill Effluents

Application of Ozonation and Biotreatment for Forest Industry Wastewater

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