Influence of zero valent scrap iron (ZVSI) supply on methane production from waste activated sludge

Zhen, Guangyin; Lü, Xueqin; Liu, Yuan; Zhao, Youcai

doi:10.1016/j.cej.2014.11.003

Cited by 170 publications

(37 citation statements)

References 69 publications

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“…3(b) and (c)). This corroborated the SCOD results, demonstrated more intracellular and/or extracellular constituents were released from the cells and/or EPSs [19,31].…”

Section: Organic Fractions In Epsssupporting

confidence: 78%

“…Microbial EPSs are the main components of the WAS floc matrix [29,30], and their presences are of great importance for maintaining the functional integrity and strength of sludge as well as biodegradability [31], so the changes of their characteristics are of great concern to understand the effects of pretreatment methods on WAS hydrolysis and further SCFAs production. The EPSs had been divided into two parts, including loosely bound EPSs (LB-EPSs) and tightly bound EPSs (TB-EPSs) [29,32].…”

Section: Epss Extractionmentioning

confidence: 99%

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Feasibility of short-term fermentation for short-chain fatty acids production from waste activated sludge at initial pH10: Role and significance of rhamnolipid

Yang

Wang

et al. 2016

Chemical Engineering Journal

102

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Short-term fermentation for SCFAs production from WAS had been proposed. RL pretreatment enhanced WAS hydrolysis/acidification under alkaline conditions. Role and significance of EPSs had been investigated. The cumulative SCFAs were better fitted with pseudo-first-order kinetic model. RL + initial pH 10 caused positive synergies on anaerobic fermentation process. a r t i c l e i n f o b s t r a c tShort-chain fatty acids (SCFAs), preferred carbon source for enhanced biological nutrients removal system, can be produced from anaerobic fermentation of waste activated sludge (WAS). Hydrolysis is known as the rate-limiting step for SCFAs production. This study presents a novel technology using rhamnolipid (RL) pretreatment connected alkaline anaerobic fermentation to enhance SCFAs production. Experiment results showed that the integration treatments performed significant enhancement of SCFAs production, and the fermentation time was remarkably shortened. The maximum SCFAs production, 378 mg COD/g VSS (volatile suspended solid), reached at 72-h fermentation time under 0.2 g RL/g TSS (total suspended solid) and initial pH 10 treatment, which was 4.31, 1.32 and 1.24 times higher than that of control, initial pH 10 and 0.2 g RL/g TSS treatment, respectively. The mechanism study showed that integration treatments could enhance the release of constituents from the cells and/or extracellular polymeric substances to suspension, and hydrolysis rate constant was improved greatly in integration treatment, 8.68, 2.14 and 1.55 times higher than that of control, sole RL and initial pH 10 treatments, respectively. The results suggested that positive synergy led to improvement of WAS solubilization and SCFAs production under integration conditions. The pseudo-first-order model was successfully built to present the SCFAs accumulation. Therefore, the integration method in this work was a promising technology for SCFAs production enhancement from WAS.

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“…3(b) and (c)). This corroborated the SCOD results, demonstrated more intracellular and/or extracellular constituents were released from the cells and/or EPSs [19,31].…”

Section: Organic Fractions In Epsssupporting

confidence: 78%

Section: Epss Extractionmentioning

confidence: 99%

Feasibility of short-term fermentation for short-chain fatty acids production from waste activated sludge at initial pH10: Role and significance of rhamnolipid

Yang

Wang

et al. 2016

Chemical Engineering Journal

102

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“…As another strategy to reduce the cost of this process (conversion of CO 2 to VFAs using ZVI and anaerobic sludge) the ZVI can be replace by scrap ZVI. Scrap ZVI which is 5-10 times cheaper than ZVI (Alibaba.com, 2020) has been used added in laboratory anaerobic bioreactors for waste and wastewater treatment and an increase of methane were found (Zhen et al, 2015;Wang et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

Methanogenesis Inhibition in Anaerobic Granular Sludge for the Generation of Volatile Fatty Acids from CO2 and Zero Valent Iron

et al. 2020

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A new approach for CO 2 utilization (as a sole carbon source) to acetic acid and other VFAs under ambient conditions using zero valent iron and anaerobic granular sludge was examined by methanogens inhibition. Zero Valent Iron when is anaerobically oxidized generates H 2 that can be utilized along with CO 2 by homoacetogens in the anaerobic granular sludge for the production of acetic acid or other VFAs. However, methanogens in anaerobic sludge act antagonistically with homoacetogens and therefore the main goal of this study is to examine strategies to inhibit methanogenesis and to enrich homoacetogens. Based on this, several strategies were investigated such as the exposure of (a) anaerobic granular sludge to low pH, (b) the short exposure of anaerobic granular sludge to heat, (c) addition of bromoethanesulfonate under various concentrations and (d) exposure of anaerobic granular sludge to salinity 30-90 g NaCl/L. The highest performance (2,020 mg/L of acetic acid) was found when anaerobic granular sludge was exposed to 50 mM of bromoethanesulfonate at 100 g/L (ZVI), pH 6-6.5, after 12 days whereas, the short exposure of anaerobic granular sludge to heat at 100 g/L ZVI at pH 6-6.5 resulted in 1,290 mg/L of acetic acid. The operation of this system in pH 5-6 generated less VFAs compared to operation at pH 6-6-5. The daily regulation of pH to 3 was not practical as the pH was increased to 6.5 due to abiotic anaerobic oxidation of ZVI and this resulted in CH 4 production and propionic acid generation. The exposure of anaerobic granular sludge to ZVI and 30 g NaCl/L as well as to seawater resulted in production of CH 4 (around 28% of the headspace) and mainly production of acetic acid (550-850 mg/L). The increased in salinity to 60 and 90 g NaCl/L resulted in reduction of CH 4 and VFAs however, a more diverse range of VFAs was produced. Exposure of anaerobic granular sludge to heat and then to CO 2 and ZVI resulted in an increase of Clostridium sensu stricto to 65.9% and the same genus was increased when anaerobic sludge was exposed to bromoethanesulfonate and ZVI.

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“…During the operating condition of COD was 6000 mg/L, the total VFA declined from 1424 mg/L to 814 mg/L with the ZVI concentration increasing to 50 mg/L. This was mainly due to its strong reductive property, and ZVI is expected to provide electrons for methanogenesis by producing water-derived H 2 during corrosion: Fe 0 + 2H 2 O → Fe 2+ + 2OH − + H 2 [44]. Fig.…”

Section: Effect Of Zvi On Excessive Acidification Inhibition In Diffementioning

confidence: 95%

Enhancing simultaneous response and amplification of biosensor in microbial fuel cell-based upflow anaerobic sludge bed reactor supplemented with zero-valent iron

Jia

Yang

Ngo

et al. 2017

Chemical Engineering Journal

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The development of a convenient and sensitive sensor such as a microbial fuel cell (MFC) to monitor the operation of upflow anaerobic sludge blanket (UASB) is indispensable. However, the biosensor's properties were affected due to excessive acidification and suffocation of the electron transport. In this study, zero-valent iron (ZVI) was applied to restrain excessive acidification and improve the sensing performance. According to the results, the response rate of electrical signal accumulated with the addition of ZVI compared to the control reactor. As well as the electrical signal amplified and the subsidence rate maximum reached 0.059 V/h with 30 mg/L ZVI added that 883% higher than the control one during the stage (COD concentration 500 mg/L-1000 mg/L). With the electrochemical analysis, the internal resistance of ZVI-UASB-MFC decreased and redox activity promoted effectively with ZVI added. During the overloading phase, the fractional content of butyric acid changed from 53% to 31%, while that of acetic acid rose from 18% to 39% after 30 mg/L ZVI addition. These results indicated that adding ZVI to the digestion could retard excessive acidification by promoting butyric acid conversion and accumulating direct interspecies electron transfer simultaneous for enhancing the biosensor's performance. According to the Fe 2+ and Fe 3+ of effluent were 2.25 mg/L and 0.39 mg/L with 50 mg/L ZVI addition, moderate amount of ZVI was effective for system and safety to the environment. It might helpfully provide a promising way to enhance biosensing.

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Influence of zero valent scrap iron (ZVSI) supply on methane production from waste activated sludge

Cited by 170 publications

References 69 publications

Feasibility of short-term fermentation for short-chain fatty acids production from waste activated sludge at initial pH10: Role and significance of rhamnolipid

Feasibility of short-term fermentation for short-chain fatty acids production from waste activated sludge at initial pH10: Role and significance of rhamnolipid

Methanogenesis Inhibition in Anaerobic Granular Sludge for the Generation of Volatile Fatty Acids from CO2 and Zero Valent Iron

Enhancing simultaneous response and amplification of biosensor in microbial fuel cell-based upflow anaerobic sludge bed reactor supplemented with zero-valent iron

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