A review on sludge conditioning by sludge pre-treatment with a focus on advanced oxidation

Zhou, Xu; Jiang, Guangming; Wang, Qilin; Yuan, Zhiguo

doi:10.1039/c4ra07235a

Cited by 94 publications

(36 citation statements)

References 86 publications

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“…It was consistent with the previous studies. [22][23][24][25][26][27] Also it could be concluded that heat-alkaline pretreatment could perform better than both freeze-thaw and ultrasonication pretreatments, while SCOD concentration obtained in heatalkaline pretreatment were 2.4 and 1.5 times more than freeze-thaw and ultrasonication pretreatment, respectively. The possible reason was that, compared with freeze-thaw and ultrasonication pretreatments, the release of intracellular and/ or extracellular constituents from the cells and/or extracellular polymeric substances (EPSs) to suspension was more effective in heat-alkaline pretreatment, and then WAS hydrolysis/ acidication was much improved.…”

Section: Performance Of Anaerobic Fermentation and Mecs Startupmentioning

confidence: 99%

Toward bioenergy recovery from waste activated sludge: improving bio-hydrogen production and sludge reduction by pretreatment coupled with anaerobic digestion–microbial electrolysis cells

Zhou

Yang

et al. 2015

RSC Adv.

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aIn this study, a novel technology named pretreatment coupled with anaerobic digestion-microbial electrolysis cells (AD-MECs) for waste activated sludge (WAS) reduction and renewable bioenergy recovery has been investigated. The results showed that, compared with the control pretreatment, the three pretreatment methods used greatly enhanced the performance of the AD-MECs process, and efficient sludge reduction was achieved, especially in heat-alkaline pretreatment, 36.9% and 46.7% for total suspended solid (TSS) and volatile suspended solid (VSS) removal in 6 days. MECs fed with fermented WAS, displayed positive potential for bioenergy recovery, and the highest bio-hydrogen yield was 20.30 mg H 2 /g VSS. Kinetic models indicated that with initial concentrations of soluble organic matter increasing, the bio-hydrogen yields of MECs increased linearly (R 2 ¼ 0.8903-0.9742). The results above suggested that the novel technology proposed in this work showed attractive potential for renewable bioenergy recovery and sludge reduction.

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Section: Performance Of Anaerobic Fermentation and Mecs Startupmentioning

confidence: 99%

Toward bioenergy recovery from waste activated sludge: improving bio-hydrogen production and sludge reduction by pretreatment coupled with anaerobic digestion–microbial electrolysis cells

Zhou

Yang

et al. 2015

RSC Adv.

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“…The enhanced removal of toxic metals may thus further improve the AD of WAS. It is known that EPS plays an important role in the dewaterability of sludge20, and as such the disruption of EPS by FNA may also affect the dewaterability of WAS.…”

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confidence: 99%

Nitrite addition to acidified sludge significantly improves digestibility, toxic metal removal, dewaterability and pathogen reduction

Keller

Yuan

et al. 2016

Sci Rep

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Sludge management is a major issue for water utilities globally. Poor digestibility and dewaterability are the main factors determining the cost for sludge management, whereas pathogen and toxic metal concentrations limit beneficial reuse. In this study, the effects of low level nitrite addition to acidified sludge to simultaneously enhance digestibility, toxic metal removal, dewaterability and pathogen reduction were investigated. Waste activated sludge (WAS) from a full-scale waste water treatment plant was treated at pH 2 with 10 mg NO2−-N/L for 5 h. Biochemical methane potential tests showed an increase in the methane production of 28%, corresponding to an improvement from 247 ± 8 L CH4/kg VS to 317 ± 1 L CH4/kg VS. The enhanced removal of toxic metals further increased the methane production by another 18% to 360 ± 6 L CH4/kg VS (a total increase of 46%). The solids content of dewatered sludge increased from 14.6 ± 1.4% in the control to 18.2 ± 0.8%. A 4-log reduction for both total coliforms and E. coli was achieved. Overall, this study highlights the potential of acidification with low level nitrite addition as an effective and simple method achieving multiple improvements in terms of sludge management.

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“…Some methods have been used for WAS treatment. 2,3 Anaerobic digestion (AD) is a sustainable and cost-effective sludge treatment method because it can not only achieve sludge reduction, but also produce resources with high added value. 4 As one of the by-products of AD, volatile fatty acids (VFAs) are an important substrate for the production of bioenergy and nutrient removal and have attracted a great deal of attention.…”

Section: Introductionmentioning

confidence: 99%

Combination of ultrasound and Fenton treatment for improving the hydrolysis and acidification of waste activated sludge

et al. 2015

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The effects of ultrasound (US), Fenton treatment, and combined US/Fenton treatment as physicochemical pretreatment processes for waste activated sludge (WAS) hydrolysis and acidification were investigated in this study. The soluble carbohydrate concentrations after US/Fenton treatment were 2.36-fold, 2.17-fold and 17.11-fold more than that obtained by the Fenton treatment, US and control tests, respectively. The corresponding concentrations of soluble protein after US/Fenton treatment were 2.43-fold, 1.47-fold and 13.37-fold more than that obtained by the Fenton treatment, US and control tests, respectively. The degree of sludge disintegration (DD COD ) for the US/Fenton treatment was 15.4%, whereas it was only 9.97% and 3.18% for the US and Fenton tests. The maximum accumulation of volatile fatty acids (VFAs) was obtained by the US/Fenton pretreatment (4594 mg COD L À1 ), which presented obvious advantages over US (3485 mg COD L À1 ) and Fenton (2700 mg COD L À1) treatments. The combination of the US and Fenton treatments had a synergetic effect on improving the hydrolysis and subsequent acidification of WAS.

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A review on sludge conditioning by sludge pre-treatment with a focus on advanced oxidation

Abstract: The production of excess sludge by biological wastewater treatment processes has been a serious issue for the operation of wastewater treatment plants (WWTP) on both the economic and environmental sides.

Cited by 94 publications

References 86 publications

Toward bioenergy recovery from waste activated sludge: improving bio-hydrogen production and sludge reduction by pretreatment coupled with anaerobic digestion–microbial electrolysis cells

Toward bioenergy recovery from waste activated sludge: improving bio-hydrogen production and sludge reduction by pretreatment coupled with anaerobic digestion–microbial electrolysis cells

Nitrite addition to acidified sludge significantly improves digestibility, toxic metal removal, dewaterability and pathogen reduction

Combination of ultrasound and Fenton treatment for improving the hydrolysis and acidification of waste activated sludge

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