Investigating the influences of quorum quenching and nutrient conditions on activated sludge flocs at a short-time scale

Salehiziri, Moslem; Amalfitano, Stefano; Gallipoli, Agata; Gianico, Andrea; Rad, Hasan Amini; Braguglia, Camilla Maria; Fazi, Stefano

doi:10.1016/j.chemosphere.2020.125917

Cited by 15 publications

(14 citation statements)

References 39 publications

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“…Marine natural products, originating from bacteria as well as higher organisms, can represent an environmentally friendly alternative to synthetic biocides (Eguía and Trueba, 2007;Adnan et al, 2018;Bauermeister et al, 2019) and an economically advantageous solution to foul-release polymers (Trepos et al, 2014;Chen and Qian, 2017;Pereira et al, 2020). In particular, the compounds that inhibit quorum sensing signals that regulate the microbial colonization and formation of aggregates could mitigate the impact of biofilms (de Carvalho, 2018;Salehiziri et al, 2020).…”

Section: Biofilmsmentioning

confidence: 99%

The Essentials of Marine Biotechnology

Barbier²,

et al. 2021

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Coastal countries have traditionally relied on the existing marine resources (e.g., fishing, food, transport, recreation, and tourism) as well as tried to support new economic endeavors (ocean energy, desalination for water supply, and seabed mining). Modern societies and lifestyle resulted in an increased demand for dietary diversity, better health and well-being, new biomedicines, natural cosmeceuticals, environmental conservation, and sustainable energy sources. These societal needs stimulated the interest of researchers on the diverse and underexplored marine environments as promising and sustainable sources of biomolecules and biomass, and they are addressed by the emerging field of marine (blue) biotechnology. Blue biotechnology provides opportunities for a wide range of initiatives of commercial interest for the pharmaceutical, biomedical, cosmetic, nutraceutical, food, feed, agricultural, and related industries. This article synthesizes the essence, opportunities, responsibilities, and challenges encountered in marine biotechnology and outlines the attainment and valorization of directly derived or bio-inspired products from marine organisms. First, the concept of bioeconomy is introduced. Then, the diversity of marine bioresources including an overview of the most prominent marine organisms and their potential for biotechnological uses are described. This is followed by introducing methodologies for exploration of these resources and the main use case scenarios in energy, food and feed, agronomy, bioremediation and climate change, cosmeceuticals, bio-inspired materials, healthcare, and well-being sectors. The key aspects in the fields of legislation and funding are provided, with the emphasis on the importance of communication and stakeholder engagement at all levels of biotechnology development. Finally, vital overarching concepts, such as the quadruple helix and Responsible Research and Innovation principle are highlighted as important to follow within the marine biotechnology field. The authors of this review are collaborating under the European Commission-funded Cooperation in Science and Technology (COST) Action Ocean4Biotech – European transdisciplinary networking platform for marine biotechnology and focus the study on the European state of affairs.

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Section: Biofilmsmentioning

confidence: 99%

The Essentials of Marine Biotechnology

Barbier²,

et al. 2021

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“…In low Mg 2+ concentration environments, P. aeruginosa can regulate 3OC 12 ‐HSL synthetase LasI and the starvation stress response regulator RelA (Guina et al, 2003). Salehiziri et al (2020) also showed that nutritional status affects the efficiency of QS, with the addition of a QQ reagent having no obvious effect on the reactor community characteristics under nutrient rich conditions. However, under starvation conditions, QS within the community was offset by the exogenous QQ agent, resulting in the collapse of aggregates (Salehiziri et al, 2020).…”

Section: Bacterial Qs Systems and Factors Influencing Qsmentioning

confidence: 99%

“…Salehiziri et al (2020) also showed that nutritional status affects the efficiency of QS, with the addition of a QQ reagent having no obvious effect on the reactor community characteristics under nutrient rich conditions. However, under starvation conditions, QS within the community was offset by the exogenous QQ agent, resulting in the collapse of aggregates (Salehiziri et al, 2020). Boyle et al (2015) demonstrated a supply‐driven QS activation process, with microbial communities exhibiting cooperative characteristics only when the bacterial cell population is large enough to trigger QS and individual cells have a sufficient supply of nutrient resources.…”

Section: Bacterial Qs Systems and Factors Influencing Qsmentioning

confidence: 99%

“…Furthermore, porcine amylase I also improves the sedimentation performance of sludge and increases the Zeta potential, reducing the production of soluble microbial products (SMPs) and thus, enhancing the filtration capacity of membranes (Jiang et al, 2013). Salehiziri et al (2020) used QQ beads (sodium alginate fixed acylase) to study the relationship between intercellular signaling systems and the external nutritional status, showing that QQ has a more significant effect when the reactor has a low food to microbe ratio (F/M). However, if QQ microbeads remain in suspension for a long time sludge flocs will deteriorate, releasing soluble polymers and colloidal substances, resulting in QQ microbead pore blockage (Waheed et al, 2020).…”

Section: Function Of Qq In Wastewater Biological Treatment Processesmentioning

confidence: 99%

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Effects of interactions between quorum sensing and quorum quenching on microbial aggregation characteristics in wastewater treatment: A review

Wang

Chen

et al. 2021

Water Environment Research

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Due to the increasingly urgent demand for effective wastewater denitrification and dephosphorization systems, there is a need to improve the performance of existing biological treatment technologies. As a bacteria‐level communication mechanism, quorum sensing (QS) synchronizes gene expression in a density‐dependent manner and regulates bacterial physiological behavior. On this basis, the QS‐based bacterial communication mechanism and environmental factors affecting QS are discussed. This paper reviews the influence of QS on sludge granulation, biofilm formation, emerging contaminants (ECs) removal, and horizontal gene transfer in sewage treatment system. Furthermore, the QS inhibition strategies are compared. Based on the coexistence and balance of QQ and QS in the long‐term operation system, QQ, as an effective tool to regulate the growth density of microorganisms, provides a promising exogenous regulation strategy for residual sludge reduction and biofilm pollution control. This paper reviews the potential of improving wastewater treatment efficiency based on QS theory and points out the feasibility and prospect of exogenous regulation strategy. Practitioner Points The mechanism of bacterial communication based on QS and the environmental factors affecting QS were discussed. The application of QS and QQ in improving the sludge performance of biological treatment systems was described. The significance of QS and QQ coexistence in sewage treatment process was described.

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“…Diversas propriedades dos flocos, tais como o tamanho, formato, densidade estabelecem a eficácia do processo de sedimentação do que é sólido e do que é líquido no decantador, o que pode influenciar na qualidade do efluente (ASENSI et al, 2019). Sendo assim, o processo de divisão do lodo, os sólidos em suspensão no flutuador, a quebra microbiana e a remoção de nutrientes são alguns elementos que se associam à estrutura dos flocos (SALEHIZIRI et al, 2020).…”

Section: Curva De Crescimento Bacterianounclassified

Avaliação do tratamento de águas residuárias em reatores de leito móvel com biofilme de um laticínio da Zona da Mata de Minas Gerais

Viana¹

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O setor de produtos lácteos tem destaque social e econômico. As indústrias de laticínios demandam recursos hídricos em suas atividades produtivas. Estima-se que cada litro de leite processado gera, em média, um a três litros de água residuária de laticínios (ARL). Tais segmentos requerem sistemas de tratamentos de efluentes que sejam eficazes e atendam às exigências ambientais. Esse estudo propõe investigar o uso de Reator de Leito Móvel com Biofilme (Moving Bed Biofilm Reactor - MBBR) em uma indústria de laticínios. Para tanto, caracterizou-se parâmetros como: pH, demanda bioquímica de oxigênio (DBO5), demanda química de oxigênio (DQO), óleos e graxas e sólidos suspensos totais (SST), além das eficiências de remoção de DBO5 e DQO no efluente primário e secundário. Comparou-se esses resultados com os limites estabelecidos na Deliberação Normativa Conjunta COPAM/CERH nº 01/2008 para lançamento de efluentes em cursos hídricos. Avaliou-se os parâmetros de controle como: Tempo de Detenção Hidráulica (TDH), Relação F/M, Carga Orgânica Volumétrica – COV, Índice Volumétrico de Lodo – IVL e Sólidos Suspensos Totais no Tanque de Aeração - SSTA. Analisou-se a curva de crescimento bacteriana, qualidade do floco biológico e a caracterização de microrganismos presentes na biomassa em suspensão. Por fim, determinou-se constantes cinéticas de remoção da matéria orgânica (DBO5 e DQO) ao longo do comprimento dos reatores MBBR 1 e 2. O sistema opera em escala real em um laticínio localizado na região da Zona da Mata no estado de Minas Gerais. Possui volume útil de 180 m³, Tempo de Detenção Hidráulica - TDH de 14 (±1) horas e vazão do afluente de 13,5 (±2,6) m³/hora. Para o estudo de caracterização dos parâmetros de lançamento em curso hídrico, as coletas do efluente primário foram realizadas na saída do sistema de tratamento primário (flotador) e do efluente secundário na saída do decantador pelo período de 9 meses consecutivos. Para o estudo de cinética, foram realizadas coletas de 3 em 3 dias em 9 pontos totalizando 27 amostras, sendo o primeiro ponto (efluente primário) e o segundo ponto (início do MBBR 1) coletados simultaneamente, os demais pontos (MBBR 1 e 2), com intervalos de coleta de 2 horas e com distanciamento de 1,18 m no decorrer do reator. Realizou-se análise microscópica através de 3 coletas realizadas no MBBR 1 no período de 2 anos. Os parâmetros analisados atendem a legislação com exceção dos SST em dois meses específicos. O sistema apresentou eficiência média de 98% na remoção de DBO5 e DQO sendo uma alternativa eficiente para o tratamento de ARL quando operado em conjunto com o flotador. Os parâmetros operacionais são condizentes com os parâmetros típicos para funcionamento de reatores MBBR. As análises de microscopia demonstraram a presença e atuação da comunidade microbiológica que atua na remoção de carga orgânica dos efluentes industriais e suas variações diante de mudanças nas características do afluente, consequência dos processos produtivos do laticínio. No estudo de cinética de degradação de DBO5 e DQO, as médias de remoções constatadas no MBBR 1 e 2 são significativas para ambos os parâmetros, ou seja, 94,9% e 94,8% respectivamente. O reator biológico de leite móvel MBBR demonstrou eficiência satisfatória quando operado em conjunto com o sistema de tratamento primário (flotador).

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Investigating the influences of quorum quenching and nutrient conditions on activated sludge flocs at a short-time scale

Cited by 15 publications

References 39 publications

The Essentials of Marine Biotechnology

The Essentials of Marine Biotechnology

Effects of interactions between quorum sensing and quorum quenching on microbial aggregation characteristics in wastewater treatment: A review

Avaliação do tratamento de águas residuárias em reatores de leito móvel com biofilme de um laticínio da Zona da Mata de Minas Gerais

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