Heavy metals interact with the microbial community and affect biogas production in anaerobic digestion: A review

Guo, Qian; Majeed, Sabahat; Xu, Rong; Zhang, Kai; Kakade, Apurva; Khan, Aman; Hafeez, Fauzia Yusuf; Mao, Chunlan; Liu, Pu; Li, Xiangkai

doi:10.1016/j.jenvman.2019.03.104

Cited by 104 publications

(41 citation statements)

References 66 publications

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“…Mycotoxins [44][45][46][47][48][49][50] Oxidised fat [51][52][53][54][55] Toxic metals (lead, cadmium, mercury, etc.) [17,[56][57][58][59] Imbalance of minerals (Se, Zn, Mn, Cu, etc.) and other nutrients [2,15,18,19,[60][61][62][63] Low water quality [2,18,19,[64][65][66][67] Usage of coccidiostats and other drugs via feed or water [2,18,19,68,69]…”

Section: Nutritional Stressorsmentioning

confidence: 99%

Antioxidant Defence Systems and Oxidative Stress in Poultry Biology: An Update

et al. 2019

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Poultry in commercial settings are exposed to a range of stressors. A growing body of information clearly indicates that excess ROS/RNS production and oxidative stress are major detrimental consequences of the most common commercial stressors in poultry production. During evolution, antioxidant defence systems were developed in poultry to survive in an oxygenated atmosphere. They include a complex network of internally synthesised (e.g., antioxidant enzymes, (glutathione) GSH, (coenzyme Q) CoQ) and externally supplied (vitamin E, carotenoids, etc.) antioxidants. In fact, all antioxidants in the body work cooperatively as a team to maintain optimal redox balance in the cell/body. This balance is a key element in providing the necessary conditions for cell signalling, a vital process for regulation of the expression of various genes, stress adaptation and homeostasis maintenance in the body. Since ROS/RNS are considered to be important signalling molecules, their concentration is strictly regulated by the antioxidant defence network in conjunction with various transcription factors and vitagenes. In fact, activation of vitagenes via such transcription factors as Nrf2 leads to an additional synthesis of an array of protective molecules which can deal with increased ROS/RNS production. Therefore, it is a challenging task to develop a system of optimal antioxidant supplementation to help growing/productive birds maintain effective antioxidant defences and redox balance in the body. On the one hand, antioxidants, such as vitamin E, or minerals (e.g., Se, Mn, Cu and Zn) are a compulsory part of the commercial pre-mixes for poultry, and, in most cases, are adequate to meet the physiological requirements in these elements. On the other hand, due to the aforementioned commercially relevant stressors, there is a need for additional support for the antioxidant system in poultry. This new direction in improving antioxidant defences for poultry in stress conditions is related to an opportunity to activate a range of vitagenes (via Nrf2-related mechanisms: superoxide dismutase, SOD; heme oxygenase-1, HO-1; GSH and thioredoxin, or other mechanisms: Heat shock protein (HSP)/heat shock factor (HSP), sirtuins, etc.) to maximise internal AO protection and redox balance maintenance. Therefore, the development of vitagene-regulating nutritional supplements is on the agenda of many commercial companies worldwide.

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Section: Nutritional Stressorsmentioning

confidence: 99%

Antioxidant Defence Systems and Oxidative Stress in Poultry Biology: An Update

et al. 2019

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“…Generally, the inhibitory and optimum metals concentrations can vary for different temperature conditions of the digesters. 190,191,193,197,201,203 [189,191,193,198,201,202] 3.7.4. Organics…”

Section: Light and Heavy Metalsmentioning

confidence: 99%

Operational Parameters of Biogas Plants: A Review and Evaluation Study

et al. 2020

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The biogas production technology has improved over the last years for the aim of reducing the costs of the process, increasing the biogas yields, and minimizing the greenhouse gas emissions. To obtain a stable and efficient biogas production, there are several design considerations and operational parameters to be taken into account. Besides, adapting the process to unanticipated conditions can be achieved by adequate monitoring of various operational parameters. This paper reviews the research that has been conducted over the last years. This review paper summarizes the developments in biogas design and operation, while highlighting the main factors that affect the efficiency of the anaerobic digestion process. The study’s outcomes revealed that the optimum operational values of the main parameters may vary from one biogas plant to another. Additionally, the negative conditions that should be avoided while operating a biogas plant were identified.

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“…The heavy metals mercury, arsenic, aluminum, cadmium and lead had a negative relationship with the richness of microbial communities in soil [40] and marine sediments [41]. Conversely, as an essential element for microorganism growth, several bacteria in contaminated soil were significantly positively correlated with zinc concentration [42], where low exposure to zinc ion (<5 mg/L) promoted biogas production in an anaerobic digestion process [43] and a low zinc oxide concentration enhanced the microbial richness by 21.3% in an anammox process [44]. The organic pollutants phenol (r = 0.51), formaldehyde (r = 0.55), and toluene (r = 0.39) were slightly positively correlated with bacterial species richness, whereas chlorobenzene (r = 0.99) was significantly negatively correlated.…”

Section: Kegg Analysis Of Dominant Taxonomic Groups and Related Metabmentioning

confidence: 99%

Activated Sludge Microbial Community and Treatment Performance of Wastewater Treatment Plants in Industrial and Municipal Zones

Yang

Wang

Feng

et al. 2020

IJERPH

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Controlling wastewater pollution from centralized industrial zones is important for reducing overall water pollution. Microbial community structure and diversity can adversely affect wastewater treatment plant (WWTP) performance and stability. Therefore, we studied microbial structure, diversity, and metabolic functions in WWTPs that treat industrial or municipal wastewater. Sludge microbial community diversity and richness were the lowest for the industrial WWTPs, indicating that industrial influents inhibited bacterial growth. The sludge of industrial WWTP had low Nitrospira populations, indicating that influent composition affected nitrification and denitrification. The sludge of industrial WWTPs had high metabolic functions associated with xenobiotic and amino acid metabolism. Furthermore, bacterial richness was positively correlated with conventional pollutants (e.g., carbon, nitrogen, and phosphorus), but negatively correlated with total dissolved solids. This study was expected to provide a more comprehensive understanding of activated sludge microbial communities in full-scale industrial and municipal WWTPs.

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Heavy metals interact with the microbial community and affect biogas production in anaerobic digestion: A review

Cited by 104 publications

References 66 publications

Antioxidant Defence Systems and Oxidative Stress in Poultry Biology: An Update

Antioxidant Defence Systems and Oxidative Stress in Poultry Biology: An Update

Operational Parameters of Biogas Plants: A Review and Evaluation Study

Activated Sludge Microbial Community and Treatment Performance of Wastewater Treatment Plants in Industrial and Municipal Zones

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