Particle size as a driver of dewatering performance and its relationship to stabilization in fecal sludge

Ward, Barbara J.; Nguyễn, Minh Tri; Sam, Stanley Bortse; Korir, Naomi; Niwagaba, Charles; Morgenroth, Eberhard; Strande, Linda

doi:10.1016/j.jenvman.2022.116801

Cited by 13 publications

(2 citation statements)

References 40 publications

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“…The median diameter (D50) is a metric used to quantify the physical attributes of particles and precisely indicates the homogeneity of the particles [67][68][69]. D10 and D90 mean the particle size of a sample when the cumulative size distribution reaches 10% and 90%, respectively.…”

Section: Assessment Of Potential Impacts On Microbial Aggregationmentioning

confidence: 99%

Methane Production Reduced by Lignin Derivatives in Pulping Wastewater: Inhibition of Free Hydrolase

Lei,

Xu,

Chen

et al. 2024

Fermentation

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The lignin derivatives generated during pulping might be responsible for the suboptimal performance of anaerobic reactors during the treatment of pulping wastewater. However, the exact mechanisms by which these derivatives exert influence remain unclear. This study investigated the influence of lignin derivatives, simulated using humic acids (HAs), in anaerobic granular sludge (AnGS). Compared to the enzymes present during floc-bonding and granule-bonding, the HAs impeded the conversion of unhydrolyzed substrates into methane and caused considerable inactivation of free enzymes. Simultaneously, the HAs suppressed agglomeration and weakened the strength of the AnGS. Furthermore, calcium ions helped maintain the integrity of the sludge structure. Therefore, the inhibition of extracellular enzymes using lignin derivatives delays the methanation of unhydrolyzed substrates, resulting in a reduced biomass within AnGS reactors owing to sludge disintegration and biomass loss. This study serves as a reference for investigating the persistent risks originating from lignin derivatives associated with using anaerobic granular-sludge bed reactors to treat pulping wastewater.

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Section: Assessment Of Potential Impacts On Microbial Aggregationmentioning

confidence: 99%

Methane Production Reduced by Lignin Derivatives in Pulping Wastewater: Inhibition of Free Hydrolase

Lei,

Xu,

Chen

et al. 2024

Fermentation

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“…A treatment plant may include stages of sludge treatment, including thickening, digestion, dewatering, and hygienization, depending on the type of wastewater treatment process and the destination of the sludge . Scientific evidence about differences between blackwater that has been stored in containment in comparison to conventional wastewater sludges is mounting, including dewatering performance, ,,,, protein-like fractions of extracellular polymeric substances (EPS), , particle size distribution, , fibers and lipids, , rheological properties, , and microbial communities …”

Section: Why Does Terminology Matter?mentioning

confidence: 99%

Urban Sanitation: New Terminology for Globally Relevant Solutions?

Strande,

Evans,

von Sperling

et al. 2023

Environ. Sci. Technol.

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Progress toward Sustainable Development Goals for global access to safe sanitation is lagging significantly. In this Feature, we propose that misleading terminology leads to errors of categorization and hinders progress toward sanitation service provision in urban areas. Binary classifications such as “offsite/onsite” and “sewered/nonsewered” do not capture the need for “transport to treatment” or the complexity of urban sanitation and should be discarded. “Fecal sludge management” is used only in the development context of low- or middle-income countries, implying separate solutions for “poor” or “southern” contexts, which is unhelpful. Terminology alone does not solve problems, but rather than using outdated or “special” terminology, we argue that a robust terminology that is globally relevant across low-, middle-, and upper-income contexts is required to overcome increasingly unhelpful assumptions and stereotypes. The use of accurate, technically robust vocabulary and definitions can improve decisions about management and selection of treatment, promote a circular economy, provide a basis for evidence-based science and technology research, and lead to critical shifts and transformations to set policy goals around truly safely managed sanitation. In this Feature, the three current modes of sanitation are defined, examples of misconceptions based on existing terminology are presented, and a new terminology for collection and conveyance is proposed: (I) fully road transported, (II) source-separated mixed transport, (III) mixed transport, and (IV) fully pipe transported.

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