Effect of Biological Treatment on Characteristics of Soluble Organic Compounds in Hardwood KP Bleaching Effluent

Abstract

Hardwood KP bleaching effluents, before (influent) and after (effluent) biological treatment, were characterized and compared to identify the main bio-recalcitrant organic compounds in the effluent. The results indicate that biological treatment reduces COD cr and BOD 5 by 67% and 88%, respectively. However, various bio-recalcitrant organic compounds were still retained in the biologically-treated effluent, which exhibits an increase in effluent color. Spectroscopic analysis suggests that colored substances are the most recalcitrant materials in the effluent. Di-n-octyl phthalate and 6,6'-di-tert-butyl-2,2'-methylenedi-p-cresol are the predominant residual materials in the biologically treated effluent. These two materials are the main recalcitrant organic compounds in the effluent and contribute to the major part of the residual COD cr in the biologically treated effluent.

Refractory organic pollutants and toxicity in pulp and paper mill wastewaters

“…Large amount of freshwater is needed in the pulp and paper industry (Savant et al 2006;Lei et al 2013). In order to produce a ton of paper, about 60 m 3 of water is required even with the most efficient process techniques.…”

“…For example, lignosulfonates are found to inhibit several biological systems, such as functions of enzymes, toxins and antibiotics and the chlorinated derivatives of lignin are poorly degraded by the conventional wastewater treatment processes (Farstad and Naess 1977;Sponza 2003). Lignin and its derivatives degrade very slowly with conventional biological processes due to strong linkages in the lignin molecule, such as biphenyl-type carbon to carbon bonds (Ali and Sreekrishnan 2001;Lei et al 2013). Lignin molecules tend to undergo self-condensation especially in acidic media showing resistance to degradation.…”

“…Aerobic or anaerobic biological treatments have little or no effect on color removal (Lei et al 2013). Colored substances are not removed or degraded during the biological treatment and the effluent color can even be increased instead.…”

Enhanced Bioethanol Production from Industrial Xylose Residue Using Efficient Delignification

“…Additionally, the absorption peak located at 1733 cm -1 was weak; it was associated with the alkyl ester of the acetyl groups in hemicellulose. The intensity of the band at 1053 cm -1 due to C-O stretching in cellulose and hemicellulose (Lei et al 2013) was also reduced in alkali-pretreated bagasse. This result supports previous findings that hemicellulose is destroyed during the pretreatment.…”

POTENSI SELULASE DAN PENGARUH LAJU PEMBEBANAN PADA EFEKTIVITAS PENGOLAHAN AIR LIMBAH KERTAS PROSES LUMPUR AKTIF (<i>POTENTIAL OF CELLULASE AND EFFECT OF LOADING RATE ON TREATMENT OF PAPER WASTEWATER OF ACTIVATED SLUDGE PROCESS</i>)

“…Namun, keberhasilan pengolahan biologi sangat tergantung pada aktivitas dan kemampuan mikroorganisme pendegradasi bahan organik dalam air limbah. Beban organik yang tinggi dalam air limbah pulp dan kertas dapat menyebabkan kendala pada proses pengolahan lumpur aktif, yaitu kemampuan biodegradasi mikroba aerob menjadi menurun terutama untuk organik kompleks seperti lignin dan selulosa (Richard, 2003;Lei, Chen and Li, 2013).…”