Catalytic Wet Air Oxidation of Sewage Sludge: A Review

Li, Debin; Wang, Duo; Zi-sheng, Jiang

doi:10.2174/2213337207999200819143311

Cited by 16 publications

(6 citation statements)

References 106 publications

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“…In the future, CWAO is planned to be developed with an aim of high stability and easy recovery of toxic byproducts. 162 Advanced oxidation is an efficient sludge reduction technology, and its application in the field of sludge treatment has gradually become a research hotspot. 163 The strong oxidizing ability of oxidant can destroy the organic components of sludge particles and can also lead to the rupture of microbial cells, so as to release intracellular water, adsorbed water, and capillary water, and improve the dewatering performance of sludge.…”

Section: Advanced Oxidation Process (Aop)mentioning

confidence: 99%

Dehydration Performance of Municipal Sludge and Its Dewatering Conditioning Methods: A Review

Jiang

Gao

Zhang

et al. 2023

Ind. Eng. Chem. Res.

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Municipal sludge is an inevitable byproduct during the treatment of wastewater, which is produced by sewage treatment plants in urban residential areas, and it contains pathogens, heavy metals, and other pollutants. Municipal sludge is suitable for application in energy utilization because of its high organic content and relatively low toxic matter. The high moisture content of municipal sludge brings huge difficulties to its harmless disposal and resource utilization. At present, the main method used for sludge dehydration is mechanical dewatering. However, the mud cake produced by this method still has a water content of up to 80%, which does not meet the current rigorous requirements. Therefore, the development of deep dehydration technology for sludge is imperative. In this paper, the basic properties and structure of sludge were summarized. As a key component of sludge flocs, extracellular polymeric substance (EPS) has received much attention in sludge dewatering conditioning. Meanwhile, the influencing factors of sludge dewatering were also fully elaborated, including sludge types, sewage hardness, surface charge, size distribution, and sludge viscosity. And the main methods of sludge dewatering treatment were comprehensively included, namely, the physical method, chemical method, biological method, and combined conditioning methods. The advantages and disadvantages of each method are mentioned, and their application situations were analyzed. Furthermore, comment was provided on the conditioning mechanism, adaptability, prospects, and limitations of the techniques for improving sludge dewatering. This systematic review related to sludge dewatering can not only provide reference information for the conditioning method but also benefit the exploitation of efficient and ecofriendly sludge dewatering technology.

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Section: Advanced Oxidation Process (Aop)mentioning

confidence: 99%

Dehydration Performance of Municipal Sludge and Its Dewatering Conditioning Methods: A Review

Jiang

Gao

Zhang

et al. 2023

Ind. Eng. Chem. Res.

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“…This method was initially designed for the paper industry, but it has since been modified for use in sewage treatment facilities, particularly for the treatment of high-toxicity industrial liquid effluent (Li et al, 2020). It is advised, however, when the effluent is too diluted to be burnt and too hazardous to be treated biologically.…”

Section: Wet Air Oxidationmentioning

confidence: 99%

Sludge Management: Current Scenario, Available Solutions and Way Forward

Balkrishna¹,

Singh²,

Pathak³

et al. 2022

Preprint

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Sewage sludge is a consequence of wastewater treatment that is produced in vast amounts all over the world, posing the responsibility of properly handling organic waste. The two primary disposal techniques for municipal sewage sludge management are reuse, which includes agricultural or landscaping applications, and ultimate disposal. Because there are a variety of concerns with final disposal techniques across the world, preparing sewage sludge for reuse, also known as sludge processing, provides another option. The goal of this review paper was to investigate sludge management strategies throughout the world and highlight its use in the agricultural sector in developing nations like India. The use of sewage sludge as a fertilizer is ecologically beneficial and results in the reuse of potentially hazardous wastes, in addition to contributing in waste reduction. The quantity of heavy metals, on the other hand, is the most significant criteria for the safe use of sewage sludge in agriculture, followed by pathogen reduction. If sewage sludge is correctly processed with appropriate technology, it has the potential to lessen our dependency on chemical fertilizers and so fall within the scope of our government's 'waste to wealth' initiative.

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“…Previously reported high catalytic activity of MOF materials showed excellent performance only in acidic environments (pH 3–4) and inactivation near neutral pH . In addition, Li reviewed the wet air oxidation of sludge catalyzed by a Cu-based MOF and found that although it has high catalytic activity, it usually requires conditions above 60 °C . Fortunately, Zr-based MOF-808 has recently been shown to be highly active under acidic, neutral, and alkaline conditions and has been used as a peroxidase simulator and a reaction catalyst. , Most importantly, MOF-808 has been proven to have excellent proton transport performance, and its unique frame structure makes it have an excellent proton conductivity of more than 10 –3 S/cm at ambient temperature .…”

Section: Introductionmentioning

confidence: 99%

High Proton Conductivity of MOF-808 Promotes Methane Production in Anaerobic Digestion

Chen

Dai

et al. 2022

ACS Sustainable Chem. Eng.

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Metal−organic frameworks (MOFs) are widely used in fuel cells, catalysis, and other fields. However, the influence and mechanism of the excellent properties of MOFs on biomethane production are still unclear. In this paper, MOF-808 was used to study anaerobic digestion (AD) of corn stalk, which increased biogas production and methane content by 11.06−39.82% and 10.15−14.28%, respectively. The optimal effect of biogas production was reached by adding 0.5 g/L MOF-808. The −OH of MOF-808 provided protons through protonation during AD, and then, a continuous hydrogen bond network was formed in the channels of frameworks. The hydrogen bond network led to the appearance of the Grotthuss mechanism, which made the dispersed H + in the system to rapidly transport to the outside of the methanogen membrane along the inner surface of the sample and the nanopores, and promoted interspecies hydrogen transfer. The formation of a transmembrane proton gradient improved the hydrogen metabolism level of methanogens and promoted the energy synthesis of microorganisms. In addition, MOF-808 had a positive impact on the community and function of the microorganisms. Due to the stable structure of MOF-808, the reflux of anaerobically digested effluent is a potential way of MOF-808 recycling.

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Catalytic Wet Air Oxidation of Sewage Sludge: A Review

Cited by 16 publications

References 106 publications

Dehydration Performance of Municipal Sludge and Its Dewatering Conditioning Methods: A Review

Dehydration Performance of Municipal Sludge and Its Dewatering Conditioning Methods: A Review

Sludge Management: Current Scenario, Available Solutions and Way Forward

High Proton Conductivity of MOF-808 Promotes Methane Production in Anaerobic Digestion

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