Influencing mechanism of high solid concentration on anaerobic mono-digestion of sewage sludge without agitation

Zhang, Yuyao; Li, Huan; Liu, Can; Cheng, Yingchao

doi:10.1007/s11783-015-0806-x

Cited by 25 publications

(10 citation statements)

References 31 publications

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“…Because more than 80% of the sewage sludge in China has already been dewatered before further disposal or treatment, high-solid anaerobic digestion has become an attractive solution to the problem of sewage sludge disposal, addressing the inadequate treatment provided by traditional low-solid anaerobic digestion processes 4 . Nevertheless, anaerobic digestion of sewage sludge as the sole substrate has some disadvantages, such as low efficiency of organic conversion, long retention time and low yield of methane; during the high-solid anaerobic digestion of dewatered sludge, the high ammonia content becomes an inhibitory factor 5 .…”

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confidence: 99%

High-solid Anaerobic Co-digestion of Sewage Sludge and Cattle Manure: The Effects of Volatile Solid Ratio and pH

Dai

Chen

Zhang

et al. 2016

Sci Rep

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High-solid anaerobic digestion is an attractive solution to the problem of sewage sludge disposal. One method that can be used to enhance the production of volatile fatty acids (VFAs) and the generation of methane from anaerobic digestion involves combining an alkaline pretreatment step with the synergistic effects of sewage sludge and cattle manure co-digestion, which improves the activity of key enzymes and microorganisms in the anaerobic co-digestion system to promote the digestion of organic waste. In this study, we describe an efficient strategy that involves adjusting the volatile solid (VS) ratio (sewage sludge/cattle manure: 3/7) and initial pH (9.0) to improve VFA production and methane generation from the co-digestion of sludge and manure. The experimental results indicate that the maximum VFA production was 98.33 g/kg-TS (total solid) at the optimal conditions. Furthermore, methane generation in a long-term semi-continuously operated reactor (at a VS ratio of 3/7 and pH of 9.0) was greater than 120.0 L/kg-TS.

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confidence: 99%

High-solid Anaerobic Co-digestion of Sewage Sludge and Cattle Manure: The Effects of Volatile Solid Ratio and pH

Dai

Chen

Zhang

et al. 2016

Sci Rep

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“…In general, non-SS organic waste is categorised in terms of its total solids (TS) content, with low-solid AD (LS-AD) systems processing non-SS organic waste with a TS content < 15%, and highsolid AD (HS-AD) systems processing non-SS organic waste with a TS content>15% (Rapport et al, 2008;Li et al, 2011). As SS contains a large volume of water, conventional AD operates on SS with a low solid content (0.2%-5%), Zhang et al (2015 and2016) explored the influence of sludge TS content on AD and diffusion behaviour, and concluded that a TS content of 6% represented the boundary between the LS-AD and HS-AD of SS. HS-AD systems have also been applied to treat non-SS solid organic materials, such as yard waste, food wastes, and organic fractions of municipal solid wastes (OFMSW) (Li et al, 2011).…”

Section: H I G H L I G H T Smentioning

confidence: 99%

“…They attributed these findings to the fact that a high TS concentration led to the rapid generation of a high concentration of metabolites (i.e., volatile fatty acids (VFAs) and ammonia), which then accumulated rather than being transformed further. Zhang et al (2015 and2016) demonstrated that the inhibition of mass transfer was a non-negligible problem during the HS-AD of SS, as they found that increasing TS from 6% to 15% without agitation led to sharp decreases in diffusion coefficients. They proposed that solid concentration has a significant influence on the mass transfer during HS-AD.…”

Section: Factors Affecting the Hs-ad Of Ssmentioning

confidence: 99%

High-solid anaerobic digestion of sewage sludge: achievements and perspectives

Gong

Dai

2020

Front. Environ. Sci. Eng.

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High-solid anaerobic digestion (HS-AD) has been applied extensively during the last few decades for treating various organic wastes, such as agricultural wastes, organic fractions of municipal solid wastes, and kitchen wastes. However, the application of HS-AD to the processing of sewage sludge (SS) remains limited, which is largely attributable to its poor process stability and performance. Extensive research has been conducted to attempt to surmount these limitations. In this review, the main factors affecting process stability and performance in the HS-AD of SS are comprehensively reviewed, and the improved methods in current use, such as HS sludge pre-treatment and anaerobic co-digestion with other organic wastes, are summarised. Besides, this paper also discusses the characteristics of substance transformation in the HS-AD of SS with and without thermal pre-treatment. Research has shown that the HS effect is due to the presence of high concentrations of substances that may inhibit the function of anaerobic microorganisms, and that it also results in poor mass transfer, a low diffusion coefficient, and high viscosity. Finally, knowledge gaps in the current research on HS-AD of SS are identified. Based on these, it proposes that future efforts should be devoted to standardising the definition of HS sludge, revealing the law of migration and transformation of pollutants, describing the metabolic pathways by which specific substances are degraded, and establishing accurate mathematical models. Moreover, developing green sludge dewatering agents, obtaining high value-added products, and revealing effects of the above two on HS-AD of SS can also be considered in future.

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“…Due to the high water content in sludge it commonly requires a huge operating volume; consequently, application of CAD is difficult in small WRRFs and in highly urbanized areas where space is limited (Duan et al, 2012). Zhang et al (2015) conducted a study to determine the boundary between CAD and HSAD and found that, without agitation, a solids concentration of 6% was the performance boundary. High solids anaerobic digestion is usually characterized by a high total solids content, ranging between 10 and 20%, and this increase in the solids content will reduce digester volume, energy requirements for heating, and material handling (Guendouz et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Anaerobic Digestion Model No. 1 Simulation of High Solids Anaerobic Digestion with Feasibility Study for El Gabal El Asfar Water Resource Recovery Facility

Aboulfotoh¹

2018

Water Environment Research

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Performance of continuous mesophilic high solids anaerobic digestion (HSAD) was simulated using Anaerobic Digestion Model No. 1 (ADM1), under different conditions (solids concentrations, sludge retention time (SRT), organic loading rate (OLR), and type of sludge). Implementation of ADM1, using the proposed biochemical parameters, proved to be a useful tool for the prediction and control of HSAD as the model predicted the behavior of the tested sets of data with considerable accuracy, especially for SRT more than 13 days. The model was then used to investigate the possibility of changing the existing conventional anaerobic digestion (CAD) units in Gabal El Asfar water resource recovery facility into HSAD, instead of establishing new CAD units, and results show that the system will be feasible. HSAD will produce the same bioenergy combined with a decrease in capital, operational, and maintenance costs.

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Influencing mechanism of high solid concentration on anaerobic mono-digestion of sewage sludge without agitation

Cited by 25 publications

References 31 publications

High-solid Anaerobic Co-digestion of Sewage Sludge and Cattle Manure: The Effects of Volatile Solid Ratio and pH

High-solid Anaerobic Co-digestion of Sewage Sludge and Cattle Manure: The Effects of Volatile Solid Ratio and pH

High-solid anaerobic digestion of sewage sludge: achievements and perspectives

Anaerobic Digestion Model No. 1 Simulation of High Solids Anaerobic Digestion with Feasibility Study for El Gabal El Asfar Water Resource Recovery Facility

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