Bioactivities and formation/utilization of soluble microbial products (SMP) in the biological sulfate reduction under different conditions

Qian, Jin; Zhou, Jun‐Mei; Pei, Xiangjun; Zhang, Mingkuan; Liu, Yu

doi:10.1016/j.chemosphere.2018.12.208

Cited by 28 publications

(6 citation statements)

References 35 publications

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“…Figure 5 also shows that the denitrifying heterotrophic biomass is not able to grow on BAP and UAP and is outcompeted by both AUT and SRB, with the latter growing on the sulfate produced during SdAD. The SRB are likely able to grow on UAP and responsible for their degradation, confirming what was previously observed in experimental studies when SMP were used as electron donor for sulfate reduction under famine conditions 8 , 16 .…”

Section: Resultssupporting

confidence: 87%

“…Notwithstanding, literature lacks SdAD studies focused on the production and consumption of these autotrophically-generated organic compounds from a kinetic point of view. As reported by Laspidou and Rittmann 6 and Ni et al 7 , the organic matter is mainly composed by soluble microbial products (SMP) which are the result of autotrophic and heterotrophic microbial activities 8 . The SMP produced during SdAD are made up of organic byproducts associated with biomass metabolism and decay 7 , 9 , 10 .…”

Section: Introductionmentioning

confidence: 92%

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Modelling the effect of SMP production and external carbon addition on S-driven autotrophic denitrification

Guerriero¹,

Mattei²,

Papirio

et al. 2022

Sci Rep

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The aim of this study was to develop a mathematical model to assess the effect of soluble microbial products production and external carbon source addition on the performance of a sulfur-driven autotrophic denitrification (SdAD) process. During SdAD, the growth of autotrophic biomass (AUT) was accompanied by the proliferation of heterotrophic biomass mainly consisting of heterotrophic denitrifiers (HD) and sulfate-reducing bacteria (SRB), which are able to grow on both the SMP derived from the microbial activities and on an external carbon source. The process was supposed to occur in a sequencing batch reactor to investigate the effects of the COD injection on both heterotrophic species and to enhance the production and consumption of SMP. The mathematical model was built on mass balance considerations and consists of a system of nonlinear impulsive differential equations, which have been solved numerically. Different simulation scenarios have been investigated by varying the main operational parameters: cycle duration, day of COD injection and quantity of COD injected. For cycle durations of more than 15 days and a COD injection after the half-cycle duration, SdAD represents the prevailing process and the SRB represent the main heterotrophic family. For shorter cycle duration and COD injections earlier than the middle of the cycle, the same performance can be achieved increasing the quantity of COD added, which results in an increased activity of HD. In all the performed simulation even in the case of COD addition, AUT remain the prevailing microbial family in the reactor.

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Section: Resultssupporting

confidence: 87%

Section: Introductionmentioning

confidence: 92%

Modelling the effect of SMP production and external carbon addition on S-driven autotrophic denitrification

Guerriero¹,

Mattei²,

Papirio

et al. 2022

Sci Rep

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“…As a result, a low HRT can indirectly contribute to an increase in the concentration of membrane foulants through increasing the SMP content in a reactor. Qian et al (2019) demonstrated that the release of EPS was significantly higher at pH 5.5 compared to pH 7.0 and 8.5. They also found a high rate of SMP being released at pH 8.5 compared to neutral and acidic pH conditions.…”

Section: Membrane Fouling At Different Levels Of Phmentioning

confidence: 95%

Selective production of volatile fatty acids at different pH in an anaerobic membrane bioreactor

Khan

Ngo

Guo

et al. 2019

Bioresource Technology

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This study investigated the production of major volatile fatty acid (VFA) components in an anaerobic membrane bioreactor (AnMBR) to treat low-strength synthetic wastewater. No selective inhibition was applied for methane production and solvent-extraction method was used for VFA extraction. The results showed acetic and propionic acid were the predominant VFA components at pH 7.0 and 6.0 with concentrations of 1.444 ± 0.051 and 0.516 ± 0.032 mili-mol/l respectively. At pH 12.0 isobutyric acid was the major VFA component with a highest concentration of 0.712 ± 0.008 mili-mol/l. The highest VFA yield was 48.74 ± 1.5 mg VFA/ 100 mg CODfeed at pH 7.0. At different pH, AnMBR performance was evaluated in terms of COD, nutrient removal and membrane fouling rate. It was observed that the membrane fouled at a faster rate in both acidic and alkaline pH conditions, the slowest rate in membrane fouling was observed at pH 7.0.

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“…Based on the feedstock type and quality (e.g., biodegradability, nutrient content, inhibition components, etc.) [68][69][70][71][72], different process-engineering techniques (e.g., pretreatment, process configuration, additive dosage) can be applied [73][74][75][76][77][78]. To name one main example, compared to other organic solid wastes, the fast acidification of carbohydrates in food wastes can lead to excessive lowering of pH in AD [79].…”

Section: Anaerobic Digestionmentioning

confidence: 99%

A critical review: emerging bioeconomy and waste-to-energy technologies for sustainable municipal solid waste management

Tsui

Wong

2019

Waste Dispos. Sustain. Energy

145

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Municipal solid waste (MSW) management has emerged as probably the most pressing issue many governments nowadays are facing. Traditionally, Waste-to-Energy(WtE) is mostly associated with incineration, but now, with the emergence of the bioeconomy, it embraces a broader definition comprising any processing technique that can generate electricity/heat or produce a waste-derived fuel. Under the ambit of the circular economy many nations are looking for, additional effort must be made to be sure of acquiring the most updated information and paving a sustainable path for managing MSW in such a frame. In this regard, we have undertaken a critical review of various technologies, with their updated progress, involved in the exploitation of MSW as a renewable resource, along with the critical advantages and limitations on energy and material cycling for sustainable MSW management. Incineration, the most widely used method, is nowadays difficult to further apply due to its dubious reputation and social opposition. Meanwhile, to address the organic fraction of MSW which currently is mostly unrecycled and causes disposal issues, the biological approach presents an attractive option. The new emphasis of bioeconomy leads us to understand how environmental biotechnologies should be better connected/integrated for more sustainable MSW management. This article is concluded with advances of future prospects, which can serve as a timely reminder to encourage competent authorities/researchers to work towards further improvement of the present MSW management system.

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Bioactivities and formation/utilization of soluble microbial products (SMP) in the biological sulfate reduction under different conditions

Cited by 28 publications

References 35 publications

Modelling the effect of SMP production and external carbon addition on S-driven autotrophic denitrification

Modelling the effect of SMP production and external carbon addition on S-driven autotrophic denitrification

Selective production of volatile fatty acids at different pH in an anaerobic membrane bioreactor

A critical review: emerging bioeconomy and waste-to-energy technologies for sustainable municipal solid waste management

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