Sewage sludge pretreatment by microwave irradiation combined with activated carbon fibre at alkaline pH for anaerobic digestion

Sun, Dezhi; Guo, Sixiao; Ma, Ning; Wang, Guowen; Chun, Ma; Hao, Jun; Xue, Ming; Zhang, Xinxin

doi:10.2166/wst.2016.149

Cited by 8 publications

(3 citation statements)

References 17 publications

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“…The VS reduction of MI pre-treated sludge was observed to be higher than that of conventional heating and was attained in a lesser amount of time. Sun et al, (2016) found that after 20 days of AD, the MI-Alkaline Carbon Fibre process at an alkaline pH attained an increase in biogas production of 63.7% in comparison to the untreated experiment.…”

Section: Microwave Irradiationmentioning

confidence: 91%

Applicability of various pretreatment techniques to enhance the anaerobic digestion of Palm oil Mill effluent (POME): A review

Khadaroo

Poh

Gouwanda

et al. 2019

Journal of Environmental Chemical Engineering

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Palm Oil Mill Effluent (POME) is a potential source of renewable energy. With the intensified energy demands in various industries, if the biogas production from POME treatment can be sustained, the palm oil industry can be made more environmentally and economically sustainable. The current POME treatment process is ineffective in removing residual oil and creates a large amount of greenhouse gas emissions. Furthermore, the limitation of the treatment process is the instability of the anaerobic digestion stage, which is affected by various operating parameters. Subsequently, the chemical and physical characteristics of POME vary depending on different factors, such as the harvest season and the efficiency of the palm oil extraction process. Therefore, having an effective pretreatment system can radically reduce the load on the anaerobic digesters, sustain biogas production, and enhance the treated effluent quality so that it can conform to the stringent environmental standards. The focus of this paper is to review the pretreatment methods (treatments undertaken prior to anaerobic digestion, which contributes to enhancing the hydrolysis step).

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Section: Microwave Irradiationmentioning

confidence: 91%

Applicability of various pretreatment techniques to enhance the anaerobic digestion of Palm oil Mill effluent (POME): A review

Khadaroo

Poh

Gouwanda

et al. 2019

Journal of Environmental Chemical Engineering

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“…Then, Cr(VI) remaining concentrations were determined by a HASH water quality analyser (DR2800, U.S.A). The maximum amount adsorbed (q m ) was calculated by Equation (1) [22]:q m = [(C 0 − C r )/V]/m where C 0 and C r are initial and final concentrations of Cr(VI) (mg·L −1 ), respectively, V is the solution volume(L) and m is the mass of N-SAC(g).…”

Section: Methodsmentioning

confidence: 99%

Preparation of N-Doped Carbon Nanosheets from Sewage Sludge for Adsorption Studies of Cr(VI) from Aqueous Solution

et al. 2019

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Porous activated carbon with specific morphology and structure are of particular importance for waste water treatment, especially for the adsorption of toxic hexavalent chromium Cr(VI). However, the scalable and cheap production of such absorbents still suffer a grand challenge. Herein, a new type of N-doped nanosheet was innovatively prepared from easily available and low-cost sewage sludge via a facile and recyclable KOH activation method. The N-doped porous carbon nanosheets (N-SAC) produced by introduction of KOH and dicyandiamide, which performed favourable features for metal ions adsorption (93.2% for Cr(VI)) due to its high specific surface area, tuneable pore size distributions and good hydrophilicity. Additionally, the capacity also remained high after two cycles of adsorption by thermal regeneration, with 90.8% removal rate. The DFT calculation also approved that the doping of N could optimize the Mulliken charges distribution and improve the HOMO energy and improve the adsorption ability of N-SAC. This original proposal may inspire new possibility of creating porous carbon absorbents in a recyclable method.

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“…Furthermore, digested sludge (or digestate) becomes easier to dewater, transport, and dispose. However, even under typical retention times of 20–30 days, decomposition of sludge in AD is incomplete, leaving 35%–45% of organic matter undigested. − This inefficiency is attributed to the rate-limiting hydrolysis step, ,− which precedes acidogenesis, acetogenesis, and methanogenesis. ,− …”

Section: Overview Of Spion-augmented Microwave-based Sludge Prehydrol...mentioning

confidence: 99%

Superparamagnetic Iron Oxide Nanoparticles as Additives for Microwave-Based Sludge Prehydrolysis: A Perspective

Hatinoglu,

Lee,

Fortner

et al. 2023

Environ. Sci. Technol.

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Wastewater treatment plants are critical for environmental pollution control. The role that they play in protecting the environment and public health is unquestionable; however, they produce massive quantities of excess sludge as a byproduct. One pragmatic approach to utilizing excess sludge is generating methane via anaerobic digestion. For this, a prehydrolysis step can significantly improve digestion by increasing biogas quality and quantity while decreasing final sludge volumes. One of the many prehydrolysis approaches is to deliver heat into sludge via microwave irradiation. Microwave-absorbing additives can be used to further enhance thermal degradation processes. However, the implications of such an approach include potential release of said additive materials into the environment via digested sludge. In this perspective, we present and discuss the potential of superparamagnetic iron oxide nanoparticles (SPIONs) as recoverable, hyperreactive microwave absorbers for sludge prehydrolysis. Due to their size and characteristics, SPIONs pack spin electrons within a single domain that can respond to the magnetic field without remanence magnetism. SPIONs have properties of both paramagnetic and ferromagnetic materials with little to no magnetic hysteresis, which can enable their rapid recovery from slurries, even in complicated reactor installations. Further, SPIONs are excellent microwave absorbers, which result in high local heat gradients. This perspective introduces the vision that SPION properties can be tuned for desirable dielectric heating and magnetic responses while maintaining material integrity to accomplish repeated use for microwave-enhanced pretreatment.

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Sewage sludge pretreatment by microwave irradiation combined with activated carbon fibre at alkaline pH for anaerobic digestion

Cited by 8 publications

References 17 publications

Applicability of various pretreatment techniques to enhance the anaerobic digestion of Palm oil Mill effluent (POME): A review

Applicability of various pretreatment techniques to enhance the anaerobic digestion of Palm oil Mill effluent (POME): A review

Preparation of N-Doped Carbon Nanosheets from Sewage Sludge for Adsorption Studies of Cr(VI) from Aqueous Solution

Superparamagnetic Iron Oxide Nanoparticles as Additives for Microwave-Based Sludge Prehydrolysis: A Perspective

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