Biodegradation of volatile solids and water mass balance of bio-drying sewage sludge after electro-dewatering pretreatment

Li, Qian; Zhi, Suli; Yu, Xiaoli; Li, Yingte; Guo, Haigang; Yang, Zhenwen; Zhang, Shuting

doi:10.1016/j.wasman.2019.04.051

Cited by 14 publications

(10 citation statements)

References 55 publications

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“…High biodrying index is demanded if biodried material is to be utilized as RDF whereas lower values of the index is preferred in the case of construction material. 39 In this study, biodrying indexes were calculated according to Equation (2). The results obtained are presented in Figure 4.…”

Section: Results Of the Dynamic Temperature And Mass Loss Measurementsmentioning

confidence: 99%

Biodrying for fuel recovery from sewage sludge: An integrated evaluation by ultimate and proximate analyses

Özbay

Akdemir

2021

Env Prog and Sustain Energy

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This study investigates the utilization of the biodrying process, which is an eco-friendly approach for sewage sludge management to produce a fuel-like product.Biodrying tests were conducted for six trials containing different amounts of bulking agents (straw and sawdust). Higher volatile matter removal was achieved for trials with sawdust as a result of better porosity conditions. Consequently, biodrying indexes were higher for straw containing trials (7.73-30.85) with straw than those trails with sawdust (6.94-13.99). Trials with straw resulted in biodried materials with lower moisture content and higher calorific value due to lower water holding capacity of straw. However, sawdust provided better fuel quality due to the higher bulk density of the product. Thus, fuel value indexes determined for trials with sawdust (81.62-152.17) were remarkably higher than those of trials with straw (16.02-68.97). Furthermore, biomass characterization indexes (>25.000) indicated that products with sawdust can be used as promising alternatives to biomass such as wood chips and wood chunks in combustion facilities.

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Section: Results Of the Dynamic Temperature And Mass Loss Measurementsmentioning

confidence: 99%

Biodrying for fuel recovery from sewage sludge: An integrated evaluation by ultimate and proximate analyses

Özbay

Akdemir

2021

Env Prog and Sustain Energy

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“…Bio-drying samples (60 g) were collected, and the analytical test method was the same as described by Li et al To indicate the heat production clearly among the four treatments, temperature accumulation (TC, °C) as an index was defined as the sum of the temperature differences between the mixtures and ambient temperature based on the following equation TC = ∑ i = 1 n T m i − T a i where T m i (°C) and T a i (°C) is the mixture temperature and ambient temperature at day i , respectively …”

Section: Methodsmentioning

confidence: 99%

“…Electro-dewatering (ED) technology is an efficient and energy-saving method for material dehydration, which can remove a significant proportion of moisture that cannot be removed using the mechanical dehydration technology. , Compared with mechanical dehydration, ED can reduce the moisture content (MC) of sludge to below 60% . However, the energy consumption per unit of dehydration increased, when the sludge cake solid content exceeded 40% .…”

Section: Introductionmentioning

confidence: 99%

Synergistic Effects of Initial Moisture Content and Particle Size on Drying Rate and Heat Production during Bio-Drying of Sludge after Electro-Dewatering

Yang

Kong

et al. 2022

ACS Sustainable Chem. Eng.

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Electro-dewatered sludge (EDS) can be bio-dried alone, instead of adding bulking agents. The initial moisture content (IMC) and particle size of the electro-dewatered sludge affect the efficiency and energy consumption during the bio-drying process. This study aimed to investigate the synergistic effects of sludge IMC and particle size on the drying rate and heat production of bio-drying with EDS. Experiments were conducted with two different IMC sludge and two different sludge particle sizes. Results showed that the highest moisture removal rate was 43.18% in treatment T4, which had materials with a smaller particle size (<3 mm) and lower IMC (38.69%). And bio-drying of T4 had the highest biological heat production (7413.14 kJ, i.e., 741.31 kJ/kg sludge), and the lowest bio-drying index (the ratio of water loss to volatile solid loss) was 7.10 among the four treatments. Five thin-layer drying kinetic models and a nonlinear regression method were analyzed to estimate the bio-drying kinetic parameters. The Midilli et al. model had a better fitting result, and the highest R 2 value was 0.9929 during bio-drying of EDS. The new coefficients k (0.1465) and n (1.0898) were obtained. Through the heat balance, the heat used for evaporation was 40−57% of the total energy consumption (5873−9140 kJ). According to the PCA, the particle size had a great influence on the bio-drying process. Also, the particle size positively correlated with temperature, moisture ratio, and drying rate.

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“…While less than 20% of the sludge attains proper treatment . Improper disposal of sludge will harm the environment and human health . Since sludge contains a large amount of organics and nutrients, the recovery of valuable resources such as short‐chain fatty acid (SCFA) through the anaerobic fermentation process can effectively offset economic consumption of WWTPs .…”

Section: Introductionmentioning

confidence: 99%

“…Improper disposal of sludge will harm the environment and human health . Since sludge contains a large amount of organics and nutrients, the recovery of valuable resources such as short‐chain fatty acid (SCFA) through the anaerobic fermentation process can effectively offset economic consumption of WWTPs . SCFA has proven to be a valuable industrial commodity and is attracting more and more attention .…”

Section: Introductionmentioning

confidence: 99%

A novel and effective pretreatment to stimulate short‐chain fatty acid production from waste activated sludge anaerobic fermentation by ferrous iron catalyzed peracetic acid

Wang

Shang

Guo

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND: This study investigates a novel, efficient and green pretreatment approach using ferrous iron catalyzed peracetic acid oxidation (Fe 2+ /PAA) on anaerobic fermentation of waste activated sludge. The underlying mechanisms are also studied for both the chemical and microbial effects. RESULTS:The results indicate that Fe 2+ /PAA exhibit significant positive synergistic effect on short-chain fatty acid (SCFA) generation, especially acetic acid. The maximal SCFA concentration of 272 mg COD g −1 VSS is obtained with Fe 2+ (2.7 mmol L -1 )/PAA (3.0 mmol L -1 ), which is 5.2 times that of the control test. Fe 2+ /PAA can effectively facilitate sludge solubilization due to the disruption of extracellular polymeric substances structure and microbial cells. The biodegradability of released organic substance is also improved due to the oxidation of non-biodegradable substances. The activity of functional enzymes for hydrolysis and acidification is enhanced but that for methanogenesis is inhibited. Further analysis on microbial community structure indicates that phylum Firmicutes and genera Proteiniclasticum showed the maximal positive correlation with SCFA production, while the abundance of methanogenic archaea especially acetoclastic methanogenic archaea is inhibited by Fe 2+ /PAA treatment. Moreover, the presence of Fe 2+ lengthened the oxygen release period of PAA, the main functional reactive oxygen species are hydroxyl radicals and Fe 2+ facilitated PAA generates more hydroxyl radicals thus enhancing the oxidation ability of PAA.CONCLUSION: This study demonstrated that Fe 2+ /PAA can be used as an effective pretreatment method for SCFA accumulation in sludge anaerobic fermentation process. The findings obtained in this study will supply information for the application of Fe 2+ catalyzed PAA pre-oxidation in sludge treatment.

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Biodegradation of volatile solids and water mass balance of bio-drying sewage sludge after electro-dewatering pretreatment

Cited by 14 publications

References 55 publications

Biodrying for fuel recovery from sewage sludge: An integrated evaluation by ultimate and proximate analyses

Biodrying for fuel recovery from sewage sludge: An integrated evaluation by ultimate and proximate analyses

Synergistic Effects of Initial Moisture Content and Particle Size on Drying Rate and Heat Production during Bio-Drying of Sludge after Electro-Dewatering

A novel and effective pretreatment to stimulate short‐chain fatty acid production from waste activated sludge anaerobic fermentation by ferrous iron catalyzed peracetic acid

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