Heavy Metal Distribution in Anaerobic Sludges

Tijero, J.; Guardiola, E.; Cortijo, Manuel; Diaz-barrionuevo, Arturo

doi:10.1080/01496399008050355

Cited by 4 publications

(4 citation statements)

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“…For AD effluents, a typical pre-treatment step that is applied in biogas plants to facilitate handling, transportation or storing of digestates, is solid/liquid separation (Möller and Müller, 2012); HMs are generally retained in the solid fraction (Tijero et al, 1990) but the degree of retention depends on the separation method and particularly on the particle size of the solids. Marcato et al (2008) found that in anaerobically digested pig slurry most of Cu and Zn was retained in particle with sizes between 3 and 25 μm, with only 3% bound on > 250 μm particles.…”

Section: Removal Of Heavy Metals During Pretreatment and Biomass Contmentioning

confidence: 99%

Using agro-industrial wastes for the cultivation of microalgae and duckweeds: Contamination risks and biomass safety concerns

Μάρκου

Wang

et al. 2018

Biotechnology Advances

139

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Aquatic organisms, such as microalgae (Chlorella, Arthrospira (Spirulina), Tetrasselmis, Dunalliela etc.) and duckweed (Lemna spp., Wolffia spp. etc.) are a potential source for the production of protein-rich biomass and for numerous other high-value compounds (fatty acids, pigments, vitamins etc.). Their cultivation using agro-industrial wastes and wastewater (WaW) is of particular interest in the context of a circular economy, not only for recycling valuable nutrients but also for reducing the requirements for fresh water for the production of biomass. Recovery and recycling of nutrients is an unavoidable long-term approach for securing future food and feed production. Agro-industrial WaW are rich in nutrients and have been widely considered as a potential nutrient source for the cultivation of microalgae/duckweed. However, they commonly contain various hazardous contaminants, which could potentially taint the produced biomass, raising various concerns about the safety of their consumption. Herein, an overview of the most important contaminants, including heavy metals and metalloids, pathogens (bacteria, viruses, parasites etc.), and xenobiotics (hormones, antibiotics, parasiticides etc.) is given. It is concluded that pretreatment and processing of WaW is a requisite step for the removal of several contaminants. Among the various technologies, anaerobic digestion (AD) is widely used in practice and offers a technologically mature approach for WaW treatment. During AD, various organic and biological contaminants are significantly removed. Further removal of contaminants could be achieved by post-treatment and processing of digestates (solid/liquid separation, dilution etc.) to further decrease the concentration of contaminants. Moreover, during cultivation an additional removal may occur through various mechanisms, such as precipitation, degradation, and biotransformation. Since many jurisdictions regulate the presence of various contaminants in feed or food setting strict safety monitoring processes, it would be of particular interest to initiate a multi-disciplinary discussion whether agro-industrial WaW ought to be used to cultivate microalgae/duckweed for feed or food production and identify most feasible options for doing this safely. Based on the current body of knowledge it is estimated that AD and post-treatment of WaW can lower significantly the risks associated with heavy metals and pathogens, but it is yet unclear to what extent this is the case for certain persistent xenobiotics.

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Section: Removal Of Heavy Metals During Pretreatment and Biomass Contmentioning

confidence: 99%

Using agro-industrial wastes for the cultivation of microalgae and duckweeds: Contamination risks and biomass safety concerns

Μάρκου

Wang

et al. 2018

Biotechnology Advances

139

View full text Add to dashboard Cite

show abstract

“…One of the characteristics of the effluent is the presence of heavy metals [1,3,4]. If these are found in excessive concentration, they can give rise to phytotoxic action by accumulating in plants, and subsequently progress through trophic chains [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…Anaerobic digestion has been a relatively widely used method in the last few years as an effective treatment process for wastewater with a high concentration of organic matter, such as tannery and urban wastewaters as well as those from the agro‐alimentary industries[1, 2].…”

Section: Introductionmentioning

confidence: 99%

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The elimination of chromium in the treatment of tannery industrial wastewater

Abdel‐Shafy

Hegemann²,

Genschow³

1997

Environmental Management and Health

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Presents the findings of a study conducted to examine the efficiency of the combined anaerobic‐aerobic reactors for the treatment of three different tannery industrial wastewaters, focusing on the fate of chromium and other associated metals. Examines elimination rates of such metals with respect to each successive treatment process. Discusses the correlation between the chemical characteristics of the wastewater influent and effluent along with the level of heavy metals in such wastewater and the produced sludge. Confirms that the use of such sludge in agriculture should be restricted and recommends the recovery of Cr from the tanning sludge.

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An Evaluation into the Potential of Biological Processing for the Removal of Metals from Sewage Sludges

Lombardi

Garcia

1999

Critical Reviews in Microbiology

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The use of sewage sludge in agricultural land as a means of sludge disposal and recycling has been shown to be economical and suitable because of the presence of nutrients such as nitrogen and phosphorus. However, municipal sludges often contain high quantities of toxic metals and other compounds that must be removed for its safe use in agricultural soils. The biological leaching of metals from sewage sludges has been shown to be a promising technique for metal detoxifying in such complex matrix. The process efficiency is dependent on several physico-chemical parameters, such as total solids concentration, metal forms, pH-ORP, and temperature. Scale-up of the process has not yet been defined and is still pursuing the correct operational design. Current research involving the bioleaching of metals from sewage sludge and its application to land, which affects soil physical properties, are presented and discussed.

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Heavy Metal Distribution in Anaerobic Sludges

Cited by 4 publications

References 1 publication

Using agro-industrial wastes for the cultivation of microalgae and duckweeds: Contamination risks and biomass safety concerns

Using agro-industrial wastes for the cultivation of microalgae and duckweeds: Contamination risks and biomass safety concerns

The elimination of chromium in the treatment of tannery industrial wastewater

An Evaluation into the Potential of Biological Processing for the Removal of Metals from Sewage Sludges

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