Ecophysiological characteristics and biogas production of cadmium-contaminated crops

Zhang, Huayong; Tian, Yonglan; Wang, Lijun; Zhang, Luyi; Dai, Liming

doi:10.1016/j.biortech.2013.07.148

Cited by 45 publications

(26 citation statements)

References 31 publications

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“…Comparing the VFA concentrations and biogas yields under different digestion temperature revealed that the amount of the total VFA concentrations did not dominate the biogas production. The stimulatory effects of Cd were also found in anaerobic digestion when other crops were used as feedstocks [8,14]. A previous study found that there was no inhibitory effect on biogas production when Cd less than 1 mg/L was present in a thermophilic reactor [14].…”

Section: Responses Of Vfasmentioning

confidence: 81%

“…The digestion microorganism in the reactors requires a trace amount of certain metals for optimal growth and performance [4]. In the past decades, the impacts of cadmium (Cd) on anaerobic digestion received great attention since it is a metal of major environmental and human concern [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies reported that the toxicity of Cd influenced the efficiency and amount of CH 4 formation [9][10][11][12]. However, only few studies showed that the biogas yields during anaerobic digestion of bioenergy crops were enhanced by Cd contamination at a certain concentration range [5,8,13,14]. Cd concentrations of 2.00 ± 0.44, 39.80 ± 1.25, and 6.37 ± 0.15 mg Cd/kg biomass in the shoot of canola, oat, and wheat improved the biogas yields by 59.37%, 79.23%, and 11.34% compared to the control group under thermophilic conditions (55.0 ± 1.0 • C) [8].…”

Section: Introductionmentioning

confidence: 99%

“…However, only few studies showed that the biogas yields during anaerobic digestion of bioenergy crops were enhanced by Cd contamination at a certain concentration range [5,8,13,14]. Cd concentrations of 2.00 ± 0.44, 39.80 ± 1.25, and 6.37 ± 0.15 mg Cd/kg biomass in the shoot of canola, oat, and wheat improved the biogas yields by 59.37%, 79.23%, and 11.34% compared to the control group under thermophilic conditions (55.0 ± 1.0 • C) [8]. A study on biogas production with maize contaminated with Cd as feedstocks (the final Cd concentration of residues achieved 5.34 mg/kg) found no inhibitory effects during the anaerobic digestion process (42 • C) [7].…”

Section: Introductionmentioning

confidence: 99%

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Cadmium Addition Effects on Anaerobic Digestion with Elevated Temperatures

Tian

et al. 2019

Energies

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Anaerobic fermentation with biogas as an energy source is influenced by the presence of heavy metals. However, the availability of the heavy metals is dependent on the digestion temperature. In this study, the impacts of Cd on the characteristics of biogas, substrate biodegradation, and enzyme activity during anaerobic co-digestion were investigated under varying digestion temperatures. The results showed that 1 mg/L initial Cd concentration improved cumulative biogas yields by 404.96%, 16.93%, and 5.56% at 55 • C, 45 • C, and 35 • C, respectively. In contrast, at low temperatures (25 • C), the yield decreased by 0.77%. In the 55 • C group, Cd addition improved the activity of cellulase (p < 0.05) and coenzyme F 420 (p < 0.01). The total chemical oxygen demand (COD) during the peak period and the transformation of hydrolytic organic components into volatile fatty acids (VFAs) influenced the CH 4 and biogas yields. There were no significant differences in cellulase, dehydrogenase, and coenzyme F 420 activities with or without Cd addition when the digestion temperature was 45 • C, 35 • C, and 25 • C. Therefore, thermophilic digestion is recommended for the efficient degradation of Cd-contaminated biowaste. Moreover, the impact of metals on the performance of anaerobic digestion should be considered together with temperature conditions in future research and practice.there is still lack of information about the role of Cd in biodegradation, particularly on the modification of the methanogenic pathway.The concentration of the available Cd in the reactor is greatly influenced by temperature changes. Under thermophilic conditions (55.0 ± 1.0 • C), Cd concentrations less than 1.0 mg/L were shown to be non-inhibitory to the anaerobic digestion process [14]. However, to the best of our knowledge, most of the previous research on the impacts of temperature was carried out without considering the presence of heavy metals in the reactors.The aim of this study was to examine the effect of elevated temperatures combined with the addition of Cd on the anaerobic digestion of lignocellulosic biomass. The impacts of Cd on the biogas properties, substrate biodegradation, and enzyme activity were investigated by comparing with a control that had no Cd added. Data from this study demonstrate the impact of temperatures on the performance and biodegradability of anaerobic fermentation and provide information for biogas production practice from metal-contaminated lignocellulosic biomass. Materials and Methods Experimental MaterialsA corn stover, a representation of lignocellulosic biomass, collected from farmland in Shandong Province, China was used as the feedstock. Prior to grinding into powder and passing through a 10-mesh sieve, the corn stover was air-dried. The stover was then pretreated with 6% phosphoric acid for 24 h at room temperature to destroy the lignocellulosic structure and enhance fermentation efficiency. After pretreatment, the corn stover was washed with deionized water 5-8 times. Fresh cow dung collected from the Yan...

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Section: Responses Of Vfasmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cadmium Addition Effects on Anaerobic Digestion with Elevated Temperatures

Tian

et al. 2019

Energies

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“…Anaerobic fermentation is a relatively efficient conversion process for biomass waste reduction with simultaneous recovery of biogas as an energy source [8][9][10][11]. In an anaerobic reactor, there are four processes that occur simultaneously, i.e., hydrolysis, acidogenesis, acetogenesis, and methanogenesis [12].…”

Section: Introductionmentioning

confidence: 99%

Biodegradability during Anaerobic Fermentation Process Impacted by Heavy Metals

Tian¹,

Zhang²,

Sanganyado³

2020

New Advances on Fermentation Processes

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In the past decades, biotechnologies for reutilizing the biomass harvested from the metal-contaminated land draw attention to many scientists. Among those technologies, anaerobic fermentation is proven as an efficient conversion process for biowaste reduction with simultaneous recovery of biogas as an energy source. During the process of anaerobic fermentation, the release of metals from the biomass will impact the growth and performance of microorganisms in reactors, which then results the variation of substrate degradation. In this chapter, the impact of metals on the degradation of substrate at different stages of fermentation process, as indicated by variations of lignocelluloses, chemical oxygen demands (COD), volatile fatty acids (VFAs), etc., will be summarized. The objective is to rationalize the relationship between metal presence and substrate degradability and give suggestions for future research on metal-contaminated biomass reutilization.

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