Alkaline extraction of wastewater activated sludge biosolids

Becerra, Flor Yunuén García; Acosta, Edgar; Allen, D. Grant

doi:10.1016/j.biortech.2010.04.021

Cited by 61 publications

(41 citation statements)

References 61 publications

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“…Alkali treatment (mainly NaOH) is an effective carbohydrate and protein extraction method. NaOH ionizes charged groups in proteins and polysaccharides [18]. The ionized functional groups of protein and polysaccharides, such as amino group, hydroxyl group, carboxyl group, complexes with heavy metals.…”

Section: Effect Of Alkali Concentration On Adsorption Capacity Of Sewmentioning

confidence: 99%

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Effect of Alkali Treatment on Heavy Metals Adsorption Capacity of Sewage Sludge

Beijing¹

2015

GEP

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Sewage sludge is the promising raw material for biosorbent preparation. In this work, we evaluated the heavy metals adsorption characteristics of alkali treated sewage sludge (ATSS) by equilibrium studies. The adsorption isotherms were fitted with Langmuir and Freundlich models. Comparing with untreated sewage sludge, the total adsorption capacity (qm) of ATSS (prepared with 0.125 mol/L NaOH) for Cd, Pb, Ni, increased by 0.51, 0.70 and 0.32 mmol/g, respectively. When the NaOH concentration for ATSS preparation increased from 0.125 mol/L to 0.25 mol/L, the qm of ATSS for Pb decreased from 1.05 mmol/g to 0.84 mmol/g. However, when the NaOH concentration increased from 0.25 mol/L to 7.5 mol/L, it showed increasing trend. According to the IR spectra data, the adsorption effect of biosorbent for heavy metals was mainly due to the complexation of -N-H groups and -COOH groups.

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Section: Effect Of Alkali Concentration On Adsorption Capacity Of Sewmentioning

confidence: 99%

“…In addition, it was studied as extraction technique to recover useful organic material (protein, carbohydrates, etc) from sewage sludge [18]- [20]. The alkali treatment can destroy the cell walls of bacteria in sewage sludge leading to the solubilization of extracellular and intracellular materials into the aqueous phase.…”

Section: Introductionmentioning

confidence: 99%

Effect of Alkali Treatment on Heavy Metals Adsorption Capacity of Sewage Sludge

Beijing¹

2015

GEP

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“…With respect to our process of extraction of surfactant-like material from wastewater biomass, we considered analytical methods (cation exchange resin (CER) extraction) and more conventional alkaline extractions currently used in the food industry [63].…”

Section: Production Technologymentioning

confidence: 99%

“…A concentrated sodium hydroxide solution (50% by weight) is then added to this suspension until the desired pH is reached. The suspension is agitated at room temperature for a certain period of time [63]. In our preliminary studies, we evaluated the extraction yield and surface tension of the supernatant liquid as a function of extraction pH for systems incubated for five weeks.…”

Section: Production Technologymentioning

confidence: 99%

Surfactants from Waste Biomass

García‐Becerra

Allen

Acosta

2010

Surfactants From Renewable Resources

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IntroductionAs has been established in other chapters of this book, the reasons behind the search for bio-based alternatives to petroleum-based surfactants can be summarized in one word -sustainability. However, there are different ways to produce bio-based surfactants, all of which have different 'degrees' of sustainability. As an example, soaps -alkaline salts of fatty acids -can be considered bio-based surfactants, as they are derived from the saponification of triglycerides obtained from plants and animals. Methyl ester sulfonates are obtained from fatty acid methyl esters (FAMEs) which in turn are also obtained from triglycerides found in plants and animal tissues. Lecithin, lysolectihins and other phospholipids can also be extracted from plant and animal tissue. As will be explained in the next sections, bio-based surfactants can also be secreted by microbial cultures fed with specific substrates.In all the above examples, there is no question about the bio-based origin of the surfactant, its biocompatibility and its ability to quickly biodegrade. However, all these attributes are necessary but not sufficient to answer the question of sustainability. Currently there are questions being raised about the sustainability of growing crops of palm oil in southeast Asia which are currently used as feedstock for soaps and other biobased surfactants. Some of the issues being considered are reduction in biodiversity, deforestation, impact of fertilizers and pesticides, and reduction in the natural habitat for numerous species [1]. With respect to the production of biosurfactants by microorganisms (e.g. rhamnolipids and sophorolipids), valuable carbon sources such as glucose are often used. These carbon sources are expensive, and are also a food source for animals and humans. Surfactants from Renew able ResourcesEdite d by Mika e l Kje llin a nd I nge g ärd Johansson

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“…The possibility of direct extraction through cell lysis and subsequent bio-surfactant release in domestic WAS by alkaline treatment, has been demonstrated [127][128][129]; however, it should be noted that the pathogenicity of certain microbes commonly found in domestic and industrial wastewaters may affect its practicality. For example, mycobacterial glycolipids, produced by pathogenic mycobacteria, such as M. avium intracellure, M. scrofulaceum and M. fortulitum [130], as well as methylrhamnolipids from Pseudomonas aeroginosa [131], are well-known for their toxicity and antigenic properties.…”

Section: Bio-flocculants and Bio-surfactantsmentioning

confidence: 99%

Value-Added Products Derived from Waste Activated Sludge: A Biorefinery Perspective

Zhang

Alvarez-Gaitan

Dastyar

et al. 2018

Water

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Substantial research has been carried out on sustainable waste activated sludge (WAS) management in the last decade. In addition to the traditional approach to reduce its production volume, considering WAS as a feedstock to produce bio-products such as amino acids, proteins, short chain fatty acids, enzymes, bio-pesticides, bio-plastics, bio-flocculants and bio-surfactants represents a key component in the transformation of wastewater treatment plants into biorefineries. The quality of these bio-products is a key factor with respect to the feasibility of non-conventional WAS-based production processes. This review provides a critical assessment of the production process routes of a wide range of value-added products from WAS, their current limitations, and recommendations for future research to help promote more sustainable management of this under-utilised and ever-growing waste stream.

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Alkaline extraction of wastewater activated sludge biosolids

Cited by 61 publications

References 61 publications

Effect of Alkali Treatment on Heavy Metals Adsorption Capacity of Sewage Sludge

Effect of Alkali Treatment on Heavy Metals Adsorption Capacity of Sewage Sludge

Surfactants from Waste Biomass

Value-Added Products Derived from Waste Activated Sludge: A Biorefinery Perspective

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