Increasing cake solids of cellulosic sludge through enzyme-assisted dewatering

J, Lu; Rao, S.N.R.; Le, Tuan Van; Mora, Sabrina; Banerjee, Sujit

doi:10.1016/j.procbio.2010.09.008

Cited by 17 publications

(5 citation statements)

References 16 publications

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“…Moreover, shorter fibers, known as the fines, would cause the pores of cake to clog and deteriorate the sludge dewaterability. This was in accordance with the results of Lu et al (2011) using enzymes conditioning to promote the sludge dewatering. After cellulase pretreatment, the addition of shorter fibers increased 3 to 6 percentage points in cake solids, leading to the porosity reduction of sludge cake.…”

Section: Table 1 Properties Of the Wpt Fiberssupporting

confidence: 92%

Enhancing paper sludge dewatering by waste polyester fiber and FeCl3 for preparation of Fe-rich biochar

Zhang

Tong

Zhou

et al. 2021

BioRes

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The paper sludge conditioning effects of waste polyester textile fibers as skeleton builders combined with ferric chloride (FeCl3) were evaluated and the sludge dewatering mechanism was explored. The catalytic effect of Fe-rich sludge biochar (Fe-SB) on enhancing sludge dewaterability was evaluated. Results showed the combined fiber-FeCl3 conditioning significantly promoted the sludge dewaterability compared with conditioner alone, leading to a 77.5% decrease in specific filtration resistance and a 68.9% increase in net yield. The decrease of extracellular polymeric substances (EPS) contents showed that the EPS were difficult to extract and sludge floc strength was enhanced as a result of chemical reactions such as complexation processes and charge neutralization. Hence, the enhancement of sludge dewaterability was primarily due to the sludge cake with a porous and incompressible structure formed by fiber and FeCl3, and the rigidity structure of fiber. Moreover, the Fe-SB prepared by fiber-FeCl3 conditioning sludge could effectively activate persulfate to enhance the sludge dewaterability, with water content of dewatered sludge decreasing by 14.6%. The Fe-SB had dual functions of the heterogeneous catalyst of persulfate and skeleton builder. This study presents a sludge recycling method that combined physicochemical conditioning and sludge biochar materials prepared by pyrolysis.

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Section: Table 1 Properties Of the Wpt Fiberssupporting

confidence: 92%

Enhancing paper sludge dewatering by waste polyester fiber and FeCl3 for preparation of Fe-rich biochar

Zhang

Tong

Zhou

et al. 2021

BioRes

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“…1). This reflects about 20% conversion of cellulose, which is also the approximate amorphous content of a bleached softwood fiber used earlier (Lu et al 2011). Hence, the likely reason that the polymer preferentially increases the rate of endoglucanase hydrolysis is that it associates more with the amorphous regions of fiber that are particularly susceptible to endoglucanase attack (Coughlan 1992; Zhang and Lynd 2004).…”

Section: Resultsmentioning

confidence: 97%

Mechanism of rate enhancement of wood fiber saccharification by cationic polyelectrolytes

Mora

Banerjee

2011

Biotechnol Lett

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“…The inoculants, Lactobacillus buchneri (LB, strain ATCC 4005) and Lactobacillus plantarum (LP, strain ATCC 14917), were obtained from the American Type Culture Collection (ATCC, 10801 University Blvd, Manassas, VA, USA). The cellulose enzyme (Cellic® Ctec2) that contained 87 -95 filter paper units (FPU)/mL activity with optimum pH of 5 (Lu et al, 2011), was obtained from Novozymes, Franklinton, N.C., USA. The inoculants (either LB or LP) were prepared by mixing 0.2 g inoculant with 32 mL of distilled water and sprayed over a 16 kg fresh WCSS to obtain at least 2.5 x 10 5 colony forming units of LAB/g fresh WCSS.…”

Section: Methodsmentioning

confidence: 99%

Effects of bacterial inoculants and an enzyme on the fermentation quality and aerobic stability of ensiled whole-crop sweet sorghum

Nkosi¹,

Vadlani²,

Brijwani³

et al. 2012

SA J. An. Sci.

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________________________________________________________________________________ AbstractA study was conducted to evaluate the effects of bacterial inoculation and cellulase on the fermentation quality of ensiled whole-crop sweet sorghum (WCSS, Sorghum bicolor L. Moench). The WCSS (323 g dry matter (DM)/kg, 251 g water soluble carbohydrates (WSC)/kg DM, 43 g crude protein (CP)/kg DM and 439 g neutral detergent fibre (NDF)/kg DM) was ensiled with i) no additive (control); ii) Lactobacillus buchneri (LB); iii) Lactobacillus plantarum (LP); and iv) LB+E, a combination of LB and enzyme. These treatments were ensiled in 1 L anaerobic jars for 25 days. The jars were opened on days 3, 7 and 15 to determine pH, while those of day 25 were sampled to determine nutrient composition, fermentation characteristics and aerobic stability. Inoculation reduced pH, butyric acid and ammonia-N and increased lactic acid content in sweet sorghum silage compared with the control. The aerobic stability of WCSS was improved with LB, while it was reduced with the homofermentative LP treatment compared with the control. The LB+E reduced the fibre, but increased residual WSC of silage. The aerobic stability of LB+E silage was lower than LB treated silage. Using enzymes to increase the WSC content of crops that already have high levels of WSC may result in reduced aerobic stability of silage. Further work is needed to evaluate these effects on silage produced on farm scale and on animal production performance. ________________________________________________________________________________

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Increasing cake solids of cellulosic sludge through enzyme-assisted dewatering

Cited by 17 publications

References 16 publications

Enhancing paper sludge dewatering by waste polyester fiber and FeCl3 for preparation of Fe-rich biochar

Enhancing paper sludge dewatering by waste polyester fiber and FeCl3 for preparation of Fe-rich biochar

Mechanism of rate enhancement of wood fiber saccharification by cationic polyelectrolytes

Effects of bacterial inoculants and an enzyme on the fermentation quality and aerobic stability of ensiled whole-crop sweet sorghum

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