Organic matter release from primary sludge by mechanical cutting

Wang, Xiaochang C.; Chen, Tiantian; Qi, Xuefei; Zhang, Yudi; Gao, Chuyue; Xie, Yili; Zhang, Anlong

doi:10.1016/j.jwpe.2020.101896

Cited by 7 publications

(2 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A high degree of sludge disintegration is evident from hydromechanical shear forces and increased bulk temperature. The degree of disintegration of nonbiological solids, for example, primary sludge and animal manure, are relatively better in comparison to biological sludge (Wang et al., 2021). Sonication treatment can increase sCOD and reduction in particle size in sludge properties.…”

Section: Resultsmentioning

confidence: 99%

COD fractionation and solubility assessment of sonicated waste‐activated sludge

Al-Hoqani¹,

Zafar²,

Musharafi³

et al. 2021

Environmental Quality Mgmt

View full text Add to dashboard Cite

Ultrasonic treatment is adopted as one of the important strategies to accelerate the hydrolysis of waste‐activated sludge (WAS). This study intends to optimize amplitude and time for ultrasonic treatment of WAS using statistically designed experiments that would render a better degree of disintegration, measured in terms of chemical oxygen demand (COD) solubilization. The main and interaction effects of nonlinear regression analysis revealed a significant interaction between amplitude and time over the degree of sludge disintegration. The ultrasonic density of 0.45 W/mL for 30 min favored a 153.84% increase in COD solubilization with a 27.65% degree of sludge disintegration. This condition also favored the minimum specific energy input of 801.58 kJ/g total suspended solids compared to other sonication conditions. Besides, the sludge volume index was reduced by 45% and 26% at the ultrasonic density of 0.45 W/mL for 60 and 30 min, respectively. Microscopic examination of WAS revealed disintegration of bacterial flocs during the ultrasonication process releasing filamentous bacteria with smaller floc sizes. The results from this study indicate that higher ultrasonic density for short time could improve the sludge disintegration with minimum specific energy input.

show abstract

Section: Resultsmentioning

confidence: 99%

COD fractionation and solubility assessment of sonicated waste‐activated sludge

Al-Hoqani¹,

Zafar²,

Musharafi³

et al. 2021

Environmental Quality Mgmt

View full text Add to dashboard Cite

show abstract

“…The extraction of SS mostly focused on waste-activated sludge, with the mechanism of extracellular polymers and intracellular carbon sources released from tough cell walls by disintegration. Other researchers also reported that primary SS contained large amounts of easily degradable organic compounds [8]. It has been reported that 80% of primary SS contains extracellular polymeric materials, including polysaccharides, proteins, and phospholipids [9,10].…”

Section: Introductionmentioning

confidence: 95%

Optimizing the Extraction of Sugars from Sewage Sludge Using Ultrasound Combined with Thermal–Alkali

Fan,

Li,

Fonseca

et al. 2024

Water

View full text Add to dashboard Cite

The extraction and utilization of sugars from readily available and cost-effective sewage sludge increases the economic potential of this residue, contributing to sustainable urban development. The work presented here presents a novel method in which sugars can be directly extracted from sewage sludge following an ultrasound + thermal–alkali pretreatment. The best results indicated that by subjecting the sludge to a 240 W ultrasound for 20 min, followed by alkali digestion using 6 mL of a 2 M NaOH solution at 48 °C for 60 min, it was possible to maximize the yield of crude sugar (34.22 wt.% dry) with the purity of crude sugar at 46.80%, reaching an extraction efficiency of 99.84%. Response surface methodology was used to optimize the crude sugar yields based on experimental data, reaching a value of 34.67 wt.% dry when employing an ultrasound exposure time of 12.5 min and 6 mL of the NaOH solution for a digestion time of 57.5 min; these results were considered consistent with the experimental data.

show abstract