An innovative respirometric method to assess the autotrophic active fraction: Application to an alternate oxic–anoxic MBR pilot plant

Capodici, Marco; Corsino, Santo Fabio; Pippo, Francesca Di; Trapani, Daniele Di; Torregrossa, Michele

doi:10.1016/j.cej.2016.04.134

Cited by 39 publications

(18 citation statements)

References 40 publications

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“…Respirometric batch tests were carried out on wastewater and MBR biomass samples for the evaluation of the kinetic/stoichiometric parameters according to [34], as well as to assess the composition of the COD fractions, in agreement with previous experiences [2]. In the batch tests aimed at evaluating the heterotrophic biokinetic/stoichiometric parameters, the nitrifying biomass was inhibited by adding 10 mg L -1 of Allylthiourea (ATU), while the exogenous oxygen uptake rate particulate inert (XI) and active biomass (Xa), and were evaluated according to [2].…”

Section: Methodsmentioning

confidence: 99%

Treatment of high strength industrial wastewater with membrane bioreactors for water reuse: Effect of pre-treatment with aerobic granular sludge on system performance and fouling tendency

Trapani

Corsino

Torregrossa

et al. 2019

Journal of Water Process Engineering

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In this study, the treatment of citrus wastewater with membrane bioreactors (MBRs) under different configurations was investigated for water reuse. In particular, one MBR and one aerobic granular sludge MBR (AGS+MBR) bench scale plants were operated for 60 days. The experimental campaign was divided into two periods. In Phase I, a conventional hollow fiber MBR was employed for the treatment of the raw high strength wastewater, whereas in Phase II a combination of in-series reactors (AGS plus MBR) was adopted for the treatment of the high strength citrus wastewater The results demonstrated that both plant configurations enabled very high COD removal, with average values close to 99%. Respirometric batch tests revealed a considerable high metabolic activity of the biomass in both plant configurations, with higher values in the AGS+MBR. It was speculated that the MBR reactor enriched in active biomass deriving from the erosion of the external granule layers in the upstream reactor. In terms of fouling tendency, higher resistance to filtration was observed in the AGS+MBR plant, also characterized by higher irremovable resistance increase compared to the MBR plant that might severely affect the membrane service life.

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Section: Methodsmentioning

confidence: 99%

Treatment of high strength industrial wastewater with membrane bioreactors for water reuse: Effect of pre-treatment with aerobic granular sludge on system performance and fouling tendency

Trapani

Corsino

Torregrossa

et al. 2019

Journal of Water Process Engineering

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“…To accurately examine the biodegradability of leachate, COD fractionation tests were performed by respirometric techniques [20]. The apparatus conmprised a flowing-gas/static-liquid respirometer (1.5 L of volume), connected to a thermostatic cryostat to maintain the sample temperature at 20 ± 0.1°C.…”

Section: Cod Fractionation Testsmentioning

confidence: 99%

“…The heterotrophic biomass kinetics in R1 and R2 were evaluated by using the same respirometric apparatus as above. The maximum heterotrophic growth rate (YH), the endogenous decay rate (bH), the heterotrophic active fraction (fXH) and the specific oxygen utilization rate (SOUR) were determined according to [20] using sodium acetate as organic substrate. Four kinetic tests were run at the end of the cultivation phase.…”

Section: Evaluation Of Biomass Kineticsmentioning

confidence: 99%

“…The main kinetic parameters of the two biomasses achieved at the end of the cultivation phase are reported in Figure 3. It can be noted that, the biomass kinetics were evaluated by using sodium acetate as organic substrate which allows assessment of the maximum values of the heterotrophic kinetic parameters [20,22].…”

Section: Metabolic Activity Of the Autochthonous And Allochthonous Bimentioning

confidence: 99%

“…Based on the above considerations, the criteria for evaluating leachate biodegradability and the opportunity to apply biological processes for treatment should be reconsidered. The use of COD fractionation tests based on respirometric techniques [20] carried out with pre-cultivated autochthonous biomass could represent a novel and convenient tool for assessing actual leachate biodegradability.…”

Section: Introductionmentioning

confidence: 99%

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Assessment of landfill leachate biodegradability and treatability by means of allochthonous and autochthonous biomasses

et al. 2020

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The biodegradability and treatability of a young (3 years old) municipal landfill leachate was evaluated by means of chemical oxygen demand (COD) fractionation tests, based on respirometric techniques. The tests were performed using two different biomasses: one cultivated from the raw leachate (autochthonous biomass) and the other collected from a conventional municipal wastewater treatment plant after its acclimation to leachate (allochthonous biomass). The long term performances of the two biomasses were also studied. The results demonstrated that the amount of biodegradable COD in the leachate was strictly dependent on the biomass that was used to perform the fractionation tests. Using the autochthonous biomass, the amount of biodegradable organic substrate resulted in approximately 75% of the total COD, whereas it was close to 40% in the case of the allochthonous biomass, indicating the capacity of the autochthonous biomass to degrade a higher amount of organic compounds present in the leachate. The autochthonous biomass was characterized by higher biological activity and heterotrophic active fraction (14% vs 7%), whereas the activity of the allochthonous biomass was significantly affected by inhibitory compounds in the leachate, resulting in a lower respiration rate (SOUR = 13 mg O2 gVSS-1 h-1 vs 37 mg O2 gVSS-1 h-1). The long-term performance of the autochthonous and allochthonous biomasses indicated that the former was more suitable for the treatment of raw landfill leachate, ensuring higher removal performance towards the organic pollutants.

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Respirometric method for kinetic modeling of ammonium‐oxidizing and nitrite‐oxidizing bacteria in a membrane bioreactor

et al. 2020

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A respirometric method for the kinetic modeling of ammonium‐oxidizing bacteria (AOB) and nitrite‐oxidizing bacteria (NOB) was implemented in two membrane bioreactor (MBRA and MBRB) systems. These biological systems worked at mixed liquor suspended solids concentration of about 6.6 g L−1. MBRA worked at 6 hr of hydraulic retention time (HRT) and 20.7°C, while the operational conditions for MBRB were 9.5 hr of HRT and 14.7°C. Experimental data were fitted to the kinetic model with R2 values of .9320 and .9250 for MBRA and MBRB, respectively. Both systems showed similar performances regarding organic matter and nitrogen removal. However, MBRB showed highest rates of carbon source degradation and net heterotrophic bacteria growth, and MBRA had highest rates of nitrogen source degradation and net autotrophic bacteria growth. This last system was characterized by values for YAOB, YNOB, μm,AOB and μm,NOB of 1.1749 mgVSS mgN−1, 0.6473 mgVSS mgN−1, 0.3664 hr−1 and 0.1823 hr−1, respectively.

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An innovative respirometric method to assess the autotrophic active fraction: Application to an alternate oxic–anoxic MBR pilot plant

Cited by 39 publications

References 40 publications

Treatment of high strength industrial wastewater with membrane bioreactors for water reuse: Effect of pre-treatment with aerobic granular sludge on system performance and fouling tendency

Treatment of high strength industrial wastewater with membrane bioreactors for water reuse: Effect of pre-treatment with aerobic granular sludge on system performance and fouling tendency

Assessment of landfill leachate biodegradability and treatability by means of allochthonous and autochthonous biomasses

Respirometric method for kinetic modeling of ammonium‐oxidizing and nitrite‐oxidizing bacteria in a membrane bioreactor

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