Enhanced decomposition of waste activated sludge via anodic oxidation for methane production and bioenergy recovery

Zhao, Zhiqiang; Zhang, Yaobin; Yu, Qilin; Ma, Weican; Sun, Jiaqi; Quan, Xie

doi:10.1016/j.ibiod.2015.10.020

Cited by 65 publications

(16 citation statements)

References 45 publications

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“…The VS/SS using the BES was significantly lower ( p < 0.05) than traditional AD without other treatments, indicating that the bioelectrochemical process is able to enhance the minimizing performance. Anodic oxidation of the BES can enhance the degradation of sludge flocs and cell walls (Zhao et al., ). However, no significant difference ( p > 0.05) was observed during the AD and PSB treatment without the BES in minimizing excess sludge.…”

Section: Resultsmentioning

confidence: 99%

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Ultrasonic treatment enhances sludge disintegration and degradation in a photosynthetic bacteria‐bioelectrochemical system

Wang

Pan

Li³

et al. 2019

Water Environment Research

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Excess sludge contains a large amount of organic matter, most of which is present in the form of bacteria and extracellular polymeric substances. In this study, a photosynthetic bioelectrochemical system (BES) combined with ultrasonic treatment (UT) was investigated to mineralize sludge. The sludge was disintegrated by the UT, and the supernatant separated from the treated sludge was further degraded through a bioelectrochemical system containing photosynthetic bacteria (PSB‐BES). The UT efficiency was enhanced by supernatant separation. The PSB‐BES method effectively improved the degradation of the soluble chemical oxygen demand (SCOD) from the supernatant. The SCOD and protein removal were increased 1.4 and 1.5 times, respectively, compared to BES without PSB. In addition, the effects of several key operating factors including illumination, voltage, and temperature were systematically investigated. This study provides a basis for further development of sludge mineralization processes. Practitioner points The sludge was disintegrated by the ultrasound treatment. The supernatant separated from treated sludge was further degraded by a bioelectrochemical system combined with photosynthetic bacteria. The ultrasonic treatment efficiency was enhanced by supernatant separation. The PSB‐BES method effectively improved the soluble chemical oxygen demand (SCOD) degradation from the supernatant. The effects of several key operating factors including light (dark–photo), voltage, and temperature were systematically investigated.

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Section: Resultsmentioning

confidence: 99%

“…However, PSB were weak in its ability to degrade protein. It has been reported that BES combined with PSB can efficiently degrade organic pollutants (Liu, Ding, Wu, & Teng, 2016;Zhao et al, 2016). Sludge supernatant after UT was investigated by PSB with BES.…”

Section: Short Communicationmentioning

confidence: 99%

Ultrasonic treatment enhances sludge disintegration and degradation in a photosynthetic bacteria‐bioelectrochemical system

Wang

Pan

Li³

et al. 2019

Water Environment Research

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“…In BES, the regenerative source of acetate is utilized to produce MCFAs at the cathodic chamber. Acetate is considered a major intermediate to produce MCFAs as it has a comparatively higher commercial value and energy content compared to the generation of methane using acetate [122]. In BESs, EF with an applied or in-situ potential can use acetate, propionate, and butyrate present majorly in waste effluents for chain elongation to produce MCFAs.…”

Section: Medium-chain Fatty Acids (Mcfa)mentioning

confidence: 99%

“…The heating value of 1 mole of caproic acid (3452 kJ) is greater than 2 moles of ethanol (2638 kJ) needed to produce it, and this indicates the importance of electrodes for commercially viable product recovery in the process of chain elongation [124]. When addressing waste management related issues, MCFA has diverse applications in aviation fuels, producing renewable diesel precursors, antimicrobial, flavor, and fragrance related intermediates [122].…”

Section: Medium-chain Fatty Acids (Mcfa)mentioning

confidence: 99%

A Comprehensive Understanding of Electro-Fermentation

et al. 2020

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Electro-fermentation (EF) is an upcoming technology that can control the metabolism of exoelectrogenic bacteria (i.e., bacteria that transfer electrons using an extracellular mechanism). The fermenter consists of electrodes that act as sink and source for the production and movement of electrons and protons, thus generating electricity and producing valuable products. The conventional process of fermentation has several drawbacks that restrict their application and economic viability. Additionally, metabolic reactions taking place in traditional fermenters are often redox imbalanced. Almost all metabolic pathways and microbial strains have been studied, and EF can electrochemically control this. The process of EF can be used to optimize metabolic processes taking place in the fermenter by controlling the redox and pH imbalances and by stimulating carbon chain elongation or breakdown to improve the overall biomass yield and support the production of a specific product. This review briefly discusses microbe-electrode interactions, electro-fermenter designs, mixed-culture EF, and pure culture EF in industrial applications, electro methanogenesis, and the various products that could be hence generated using this process.

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“…Sewage sludge may contain many pathogens such as viruses, bacteria, protozoa and soil-transmitted helminths (STHs), and is disposed of as fertilizer for agricultural systems 53 . These pathogens are removed and killed by different chemical methods to avoid risk of human exposure 54 . However, Ascaris eggs are highly resistant to chemicals, heat and physical stress 55 .…”

Section: Further Identification Of Nematode Eggs -Lifetime Measuremenmentioning

confidence: 99%

Real-time detection and identification of nematode eggs genus and species through optical imaging

Qazi

Khalid

Poddar

et al. 2020

Sci Rep

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Nematode eggs are pervasive pathogens that infect billions of people and livestock every year. Adult parasitic nematode worms can be distinguished based on their size and morphology. However, their eggs, particularly their species Ascaris lumbricoides and Ascaris suum cannot be identified from each other. Identifying eggs of helminths from wastewater and sludge is important from a public health perspective to minimize the spread of Ascaris infections. Numerous methods exist for nematode identification, from a morphological-based approach to high throughput sequencing technology. However, these techniques are not consistent and often laborious and time-consuming. In this study, we demonstrate that non-invasive real-time identification of eggs is possible based on their intrinsic fluorescence. Using confocal microscopy, we investigate the autofluorescence properties of five species of nematode eggs and observe clear differences between genus and for the first time their species in sludge samples. This non-invasive imaging technique could lead to better understanding of these species and may assist in early control of diseases.

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Enhanced decomposition of waste activated sludge via anodic oxidation for methane production and bioenergy recovery

Cited by 65 publications

References 45 publications

Ultrasonic treatment enhances sludge disintegration and degradation in a photosynthetic bacteria‐bioelectrochemical system

Ultrasonic treatment enhances sludge disintegration and degradation in a photosynthetic bacteria‐bioelectrochemical system

A Comprehensive Understanding of Electro-Fermentation

Real-time detection and identification of nematode eggs genus and species through optical imaging

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