Effect of influent substrate concentration and hydraulic retention time on the performance of down-flow anaerobic fixed bed reactors treating piggery wastewater in a tropical climate

Sánchez, E.; Borja, R.; Travieso, L.; Martín, A.; Colmenarejo, M.F.

doi:10.1016/j.procbio.2004.02.005

Cited by 26 publications

(7 citation statements)

References 23 publications

(31 reference statements)

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“…The process stability can be determined by using the VFA/alkalinity ratio (Sanchez et al 2005). A reduction in reactor alkalinity under normal operation levels is considered to be indicative of reactor failure, and can be induced by an accumulation of VFA owing to the failure of methane-forming bacteria to convert the organic acids to methane.…”

Section: Methane Productionmentioning

confidence: 99%

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Evaluation of a hybrid upflow anaerobic sludge-filter bed reactor: effect of the proportion of packing medium on performance

Rajagopal

Mehrotra

Kumar

et al. 2010

Water Science and Technology

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The aim of this study was to determine the effects of the volume occupied by the filter bed zone on the behavior of an anaerobic hybrid UASFB reactor. This configuration contains a sludge bed in the lower part of the reactor and a filter bed in the upper part. Three such reactors, each with a working volume of 9.8-L, were studied; these differed in proportion of packing medium occupying 50, 35 and 20% of the working volume of the reactors, respectively. All the reactors were fed with wine distillery vinasse and were operated for a period of 232 days at 33+/-1 degrees C with increasing OLRs. No significant differences were observed between the reactors for the range of OLRs studied. Indeed, relatively high OLRs could be reached for all the three reactors with an average OLR of about 18 g COD/L d towards the end of the experiment, while maintaining a constant HRT of 26 h. COD(t) and COD(s) removal efficiencies were always more than 80 and 86%, respectively, even for the highest OLR. High quantities of VS were accumulated in the reactors with an average value of 438+/-17 g per reactor. Most of the biomass was in the sludge bed zone suggesting that this part was playing a major role in COD removal. The internal packing medium on the top of the reactor had a key role in retaining the small flocculated particles inside the reactor, while minimizing the escape of solids in the effluent. This study suggests that low packing volume ratios can be used in the design of UASFB reactors, which allows a reduction in the costs of packing medium required as the supports are expensive.

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Section: Methane Productionmentioning

confidence: 99%

“…During the entire study period, VFA/alkalinity was less than 0.4 and there was no risk of acidification (Table 1). The risk of acidification is reported to be higher at VFA/alkalinity of more than 0.5 (Sanchez et al 2005). …”

Section: Methane Productionmentioning

confidence: 99%

Evaluation of a hybrid upflow anaerobic sludge-filter bed reactor: effect of the proportion of packing medium on performance

Rajagopal

Mehrotra

Kumar

et al. 2010

Water Science and Technology

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“…The use of supporting media contributed to the increase in microbial retention time, increasing the capacity of the reactor to resist shock loadings of organic compounds, changes in substrate characteristics, and the presence of inhibitory compounds. The benefits of using ceramic rasching rings as supporting media to which microorganisms attach to achieve high organic matter removal efficiencies for piggery wastewater have been demonstrated (Sá nchez et al 2005). Nacheva et al (2008) conducted FBR packed with ceramic spheres as supporting media for domestic wastewater treatment.…”

Section: Introductionmentioning

confidence: 99%

“…The advantages of porous ceramic spheres with a rough surface to which microorganisms could attach easily and plastic rings used to prevent flow clogging have been reported (Wuertz et al 2003;Sá nchez et al 2005). Therefore, two-stage laboratory-scale fixed-biofilm reactors (FBRs) with porous ceramic sticks and plastic rings as supporting media were utilized to remove nitrogen and organic carbon (as COD) from swine wastewater in this study.…”

Section: Introductionmentioning

confidence: 99%

Nitrification/denitrification in swine wastewater using porous ceramic sticks with plastic rings as supporting media in two-stage fixed-biofilm reactors

Lin

2010

Water Science and Technology

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This study evaluated the performance of oxic-anoxic fixed-biofilm reactors (FBRs) using porous ceramic sticks with plastic rings as supporting media for nitrogen and organic carbon (as COD) removal from swine wastewater. Experimental results indicate that the removal efficiency of NH(4)(+)-N increased to 86-92% from 52-98% as the volumetric ammonium-nitrogen loading rate increased to 0.25 kg NH(4)(+)-N/m(3)-d from 0.082 kg NH(4)(+)-N/m(3)-d. Furthermore, during the denitrifying column test, the average removal efficiencies for COD and NO(x)-N were 83 and 76%, respectively. Only small amounts of NO(2)(-)-N and NO(3)(-)-N accumulated in the denitrifying FBR. The average values for NO(2)(-)-N and NO(3)(-)-N in effluent from denitrifying reactor were roughly 2 mg/L and 6 mg/L, respectively. Approximately 82% of NO(3)(-)-N was converted into N(2) by denitrifying bacteria in the denitrifying FBR. Approximately 98-100% high removal efficiencies of NO(x)-N could be reached in denitrifying FBR, when the ratio of COD(r)/NO(x)-N(r) was controlled at 9-12 throughout the test. Microscopic observations show that cell number on the ceramic sticks in denitrifying FBR was greater than that in nitrifying FBR in the final phase of colonization.

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“…Swine wastewater is characterized by a high content of organic matter, solids, and nitrogen [1,2]. The removal of nitrogen as well as organic matter from this wastewater is particularly important, because ammonia is toxic to fish or aquatic microorganisms, and is oxygen-consuming compounds which deplete the dissolved oxygen (DO) in the stream [3].…”

Section: Introductionmentioning

confidence: 99%

Efficient nitrogen removal in a pilot system based on upflow multi-layer bioreactor for treatment of strong nitrogenous swine wastewater

Kwon²,

Ahn³

et al. 2007

Process Biochemistry

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Effect of influent substrate concentration and hydraulic retention time on the performance of down-flow anaerobic fixed bed reactors treating piggery wastewater in a tropical climate

Cited by 26 publications

References 23 publications

Evaluation of a hybrid upflow anaerobic sludge-filter bed reactor: effect of the proportion of packing medium on performance

Evaluation of a hybrid upflow anaerobic sludge-filter bed reactor: effect of the proportion of packing medium on performance

Nitrification/denitrification in swine wastewater using porous ceramic sticks with plastic rings as supporting media in two-stage fixed-biofilm reactors

Efficient nitrogen removal in a pilot system based on upflow multi-layer bioreactor for treatment of strong nitrogenous swine wastewater

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