Influence of feeding pattern and hydraulic selection pressure to control filamentous bulking in biological treatment of dairy wastewaters

Meunier, Christophe; Henriet, Olivier; Schoonbroodt, Bastien; Boeur, Jean-Marc; Mahillon, Jacques; Henry, Paúl

doi:10.1016/j.biortech.2016.09.052

Cited by 32 publications

(16 citation statements)

References 38 publications

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“…From molecular DNA analysis, we could observe that neither PAO nor GAO genera dominated the overall microbial community, but the denitrifiers and EPS producers Thauera and Zoogloea were found to be the genera with the highest read abundance. These findings are in agreement with researchers such as Meunier et al . and Zhang et al ., who studied microbial dynamics during sludge granulation and also found high read abundances of Zoogloea and Thaurea .…”

Section: Discussionsupporting

confidence: 93%

Biological nutrient removal from slaughterhouse wastewater via nitritation/denitritation using granular sludge: an onsite pilot demonstration

Dobbeleers

Caluwé

Dockx

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND: In this study, an onsite pilot sequencing batch reactor (SBR) of 450 L was operated at a local Flemish slaughterhouse in two consecutive periods. During period I, nitrogen removal via nitritation/denitritation (Nit/DNit) was achieved by the use of an innovative startup strategy without seed sludge and subsequently maintained by the use of aeration phase length control based on the oxygen uptake rate (OUR). In period II, the operational strategy was modified. In order to obtain Nit/DNit granular sludge (GS), an anaerobic (feast) feeding was introduced followed by a dynamic controlled (OUR-based) aerobic (famine) reaction step. RESULTS: After 74 days, the local (Flemish) legislation standards for COD (125 mg O 2 L −1 ) and T-N (15 mg N L −1 ) were fulfilled. During period II, floccular sludge was partially transformed into GS, which resulted in increased COD and NH 4 -N conversion rates of 50 and 60% respectively. Average removal efficiencies for SCOD, N and P during period II were 89.5 ± 4.2, 88.8 ± 9.8 and 84.4 ± 9.3% respectively. Despite the relatively low biomass concentrations (2.5 g L −1 ), excellent sludge settling was reported, with SVI 30 < 100 mL g −1 from day 167 onwards. Moreover, it was found that the operational strategy and temperature variability had a crucial impact on the microbial community dynamics and granule growth.CONCLUSION: This study demonstrated the Nit/DNit BNR-GS system in a real operational environment through the operation of an onsite pilot plant.

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Section: Discussionsupporting

confidence: 93%

Biological nutrient removal from slaughterhouse wastewater via nitritation/denitritation using granular sludge: an onsite pilot demonstration

Dobbeleers

Caluwé

Dockx

et al. 2019

J of Chemical Tech & Biotech

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“…In sequential batch reactors (SBRs), this strategy is commonly named the “feast and famine” regime or “periodic starvation” and is specifically used in aerobic granulation 11 . A periodic starvation strategy was recently applied in a lab-scale SBR fed with a dairy wastewater to convert a bulking sludge caused by Thiothrix and Leptothrix species into a well-settling granular sludge 12 . This procedure resulted in the decline of the filamentous bacteria and the growth of the phosphate accumulating organism (PAO) Candidatus Accumulibacter and the glycogen accumulating organism (GAO) Candidatus Competibacter.…”

Section: Introductionmentioning

confidence: 99%

Filamentous bulking caused by Thiothrix species is efficiently controlled in full-scale wastewater treatment plants by implementing a sludge densification strategy

Henriet

Meunier

Henry

et al. 2017

Sci Rep

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Filamentous bulking caused by Thiothrix species is responsible for sludge washout and loss of performance in dairy wastewater treatment plants. A long-term study was conducted over 1.5 years to test three different mitigation strategies in a full-scale plant composed of two parallel sequential batch reactors (SBR1 and 2). Strategies based on polyaluminium chloride addition and volatile fatty acids reduction were ineffective to permanently solve the problem. On the contrary, modification of the reactor cycle based on the implementation of a periodic starvation proved efficient to solve the biomass wash-out and drastically reduce the sludge volume index in both reactors. Bacterial diversity analysis using 16S amplicon sequencing and quantitative PCR indicated a reduction of Thiothrix abundance from 51.9 to 1.0% in SBR1 and from 71.8 to 0.6% in SBR2. Simultaneously, the abundance of the glycogen-accumulating bacterium Candidatus Competibacter increased in both reactors. Microscopy analysis confirmed the transition between a bulking sludge towards a granular-like sludge. This study confirms the applicability of a periodic starvation to (1) solve recurring Thiothrix bulking, (2) convert loose aggregates into dense and compact granular-like structures and (3) considerably reduce energy demand for aeration.

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“…The results revealed that an appropriate addition of energy grass could enhance AD, decrease the mobility of heavy metals, and promote heavy metal stabilization in sewage sludge during AD, which is beneficial for the subsequent land application of sewage sludge. Meunier et al (2016) reported that adjusting the sequencing batch reactors (SBR) operations may convert a bulking activated sludge into a well settling biomass at low aeration velocity. The results revealed that a combination of an anaerobic micro aerated feeding pattern with a low selective pressure was beneficial to suppress filamentous overgrowth and to form aerobic granules, while increasing the efficiency of suspended solid removal.…”

Section: Aerobic Wastementioning

confidence: 99%

Chemical Waste and Allied Products

Hung¹,

Aziz²,

Zainal³

et al. 2017

Water Environment Research

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This review of literature published in 2016 focuses on waste related to chemical and allied products. The topics covered include waste management, aerobic waste treatment, anaerobic waste treatment, air emission, biological waste treatment, groundwater remediation, water recycle, water analysis, water reuse, soil remediation, sorption, physicochemical treatment, ozonation, and fertilizer waste. Future topics include the pollution effect on the environment, especially, to the ecosystem and human as well as improved treatment processes to alleviate the detrimental effects.

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Influence of feeding pattern and hydraulic selection pressure to control filamentous bulking in biological treatment of dairy wastewaters

Cited by 32 publications

References 38 publications

Biological nutrient removal from slaughterhouse wastewater via nitritation/denitritation using granular sludge: an onsite pilot demonstration

Biological nutrient removal from slaughterhouse wastewater via nitritation/denitritation using granular sludge: an onsite pilot demonstration

Filamentous bulking caused by Thiothrix species is efficiently controlled in full-scale wastewater treatment plants by implementing a sludge densification strategy

Chemical Waste and Allied Products

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