Dynamics of nematodes in a high organic loading rotating biological contactors

Salvadó, Humbert; Palomo, Alejandro; Mas, Meritxell; Puigagut, Jaume; Gracia, Ma del Pilar

doi:10.1016/j.watres.2004.03.007

Cited by 33 publications

(16 citation statements)

References 8 publications

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“…These organisms are frequently abundant in the biofilm system and are important for good biofilm development by their mechanical effect on biofilm structure [17,18]. However, in the current study, rotifers caused the disintegration of granules in R1 and produced higher SS in both reactors (Figures 1 and 2).…”

Section: Effect Of Rotifers On the Structure Of Granulesmentioning

confidence: 52%

Effect of Rotifers on the Stability of Aerobic Granules

Li¹,

Kondo²,

Kusuda³

et al. 2007

Environmental Technology

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The current study evaluated the effect of rotifers on the stability of aerobic granules. Two sequence batch reactors (SBRs) with airflow rates of 4 (R1) and 6 (R2) 1 min(-1), respectively, were used to develop aerobic granules. Granules were well developed with excellent settleability in terms of SVI30 (sludge volume index,) of about 50 ml g(-1) in both reactors at the beginning. With the outgrowth of rotifers, granules completely disintegrated in R1 around cycle 500 (a cycle was 3 hours). However, after the rotifers disappeared, i.e. cycle 550, granules re-appeared with a slow settling rate in R1 (SVI30: 200-300 ml g(-1)). The rotifers mechanically damaged the structure of granules, resulting in disintegration. However, granules developed under high shear force seem to have strong resistance to rotifers. During re-granulation, a long time lag between the improvements of morphology and settleability suggested that re-granulation resulted from entanglement more than bio-attachment or bio-growth. Additionally, it was confirmed that the ratio of carbohydrate to protein extracellular polymeric substances (EPS) could well indicate the strength of granules. Protein EPS well correlated with the difference between SVI5 and SVI30 in R1, therefore, decreasing protein EPS would increase the compactness of granules.

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Section: Effect Of Rotifers On the Structure Of Granulesmentioning

confidence: 52%

Effect of Rotifers on the Stability of Aerobic Granules

Li¹,

Kondo²,

Kusuda³

et al. 2007

Environmental Technology

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“…As long as this parameter decreases along the RBC, its effect as a limiting factor decreases too, resulting in an increase in the majority of existing species. Initial stages are almost entirely constituted by species of ciliates, whereas the last stages show more diversified communities, not only in species of ciliates but also in flagellates, amoebae and metazoa (Martín-Cereceda et al 2001a;Salvadó et al 2004).…”

Section: Biofilm Characteristicsmentioning

confidence: 99%

Rotating biological contactors: a review on main factors affecting performance

Cortez

Teixeira

Oliveira

et al. 2008

Rev Environ Sci Biotechnol

128

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Rotating biological contactors (RBCs) constitute a very unique and superior alternative for biodegradable matter and nitrogen removal on account of their feasibility, simplicity of design and operation, short start-up, low land area requirement, low energy consumption, low operating and maintenance cost and treatment efficiency. The present review of RBCs focus on parameters that affect performance like rotational speed, organic and hydraulic loading rates, retention time, biofilm support media, staging, temperature, influent wastewater characteristics, biofilm characteristics, dissolved oxygen levels, effluent and solids recirculation, stepfeeding and medium submergence. Some RBCs scale-up and design considerations, operational problems and comparison with other wastewater treatment systems are also reported.

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“…The approach was based on a sequential addition of two types of easily available biocatalyst to the reactor during start-up: aerobic nitrifying biomass and anaerobic methanogenic sludge. Salvado et al (2004) studied the dynamics of nematodes in a high organic loading RBCs. Analysis of biofilm composition showed a well-established zoning of microfauna, with nematodes as dominant group, among the three RBC sections analyzed.…”

Section: Rotating Biological Contactorsmentioning

confidence: 99%