Start-up and steady-state results of a full-scale UASB reactor treating malting wastewater

Borzacconi, Liliana; López, Iván; Passeggi, Mauricio

doi:10.2166/wst.2006.515

Cited by 13 publications

(15 citation statements)

References 6 publications

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“…A full scale UASB reactor of 250 m 3 [10] for treatment of malting plant effluent was monitored during 180 days (Fig. 1).…”

Section: Methodsmentioning

confidence: 99%

“…In this case, it is difficult to reach true steady states because of inlet flow and concentration disturbances. Another approach is proposed in this paper based on global COD balances from S 1 and S 2 , applied to a 250-m 3 reactor treating malting plant effluent [10]. After k 1 , k 2 , k 3 and k 6 determination, an asymptotic observer [11] is used to estimate biomass concentration without knowledge about the reaction kinetics.…”

Section: Introductionmentioning

confidence: 99%

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Modelling a full scale UASB reactor using a COD global balance approach and state observers

López

Borzacconi

2009

Chemical Engineering Journal

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“…A full scale UASB reactor of 250 m 3 [10] for treatment of malting plant effluent was monitored during 180 days (Fig. 1).…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modelling a full scale UASB reactor using a COD global balance approach and state observers

López

Borzacconi

2009

Chemical Engineering Journal

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“…A full scale (250 m 3 ) UASB reactor (Borzacconi et al 2006) was inoculated with sludge taken from an anaerobic lagoon used for the treatment of slaughterhouse effluents. The amount of sludge used was 3900 kg of TSS with an average content of 77% VSS (3,000 kg) and with a SMA of 0.1 gCOD/gVSS.d.…”

Section: Methodsmentioning

confidence: 99%

“…In previous works results from the full scale and a pilot experiences were reported (Martínez et al 2001;Borzacconi et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Sludge deterioration in a full scale UASB reactor after a pH drop working under low loading conditions

Borzacconi

López

Passeggi

et al. 2008

Water Science and Technology

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A full scale UASB reactor treating the effluent of a malting plant was operated during nearly two years. During 37 weeks of operation the reactor worked with a COD removal efficiency of 80% and a biogas production of nearly 300 m(3)/d with a methane content of 77%. After the start up and during these months of operation the volumetric organic load was 4 kgCOD/m(3).d and the specific organic load was between 0.2-0.4 kgCOD/kgVSS.d. The sludge SMA in this period was around 0.25 kgCOD/kg VSS.d. On week 37 as a result of a problem at the industrial process the pH in the reactor dropped to a value of 4.8. After pH recovering, the reactor worked with fluctuating COD values in the exit and showed a downward trend in the COD removal efficiency. On week 81 the presence of filaments in the granules was detected. High proportion of Chloroflexi filaments were detected by FISH in the sludge. Changes in the microbial population caused by the low pH probably destabilize the reactor performance. The presence of filamentous granules in the sludge and its further growing could be encouraged by the pH drop and the low specific organic load applied to the reactor. The low specific organic load was a consequence of the high VSS content in the UASB reactor, due to the lack of purges. The length of the filaments attached to the granules grew throughout time. In order to eliminate the sludge with poor settlement properties a recycle was applied to the reactor. As a consequence, low amount of granular sludge stayed in the reactor. At the end, COD concentration in the influent reached higher values than in normal operation; at the same time a complete sludge wash out occurred. On the other hand, using the same sludge (after the recycle implementation) in a bench scale reactor the good properties of the sludge were completely recovered.

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“…This has led to organisations constructing AD plants to achieve various waste management targets and renewable energy goals (Bekkering et al, 2016) A popular form of treatment for medium to high strength effluents is Upflow Anaerobic Sludge Blankets (UASBs) (Musee et al, 2016), which have demonstrated high reliability both in terms of their COD removal efficiencies (typically >80%) and biogas CH 4 concentrations (typically >50%) (Latif et al, 2011). This performance has been documented in a number of studies treating a wide range of wastewaters including: Palm oil mill effluent (Siang, 2006); Paper mill wastewater (Kamali et al, 2016); Distillery wastewater (Musee et al, 2016); dairy wastewater (Tawfik et al, 2008); fishery wastewater (Huang et al, 2009); slaughterhouse wastewater (Chavez et al, 2005); Piggery effluent (Huang et al, 2005) municipal wastewater (Rivzi et al, 2015), malting's steep water (Borzacconi et al, 2006) and malt ingredients factory wastewater (Cairns and Mead, 2017).…”

Section: Introductionmentioning

confidence: 97%

Start Up of a UASB Treating Malted Ingredient Manufacturing Wastewater

Cairns¹,

Mead

2018

EMSD

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With a greater push to achieve waste management and renewable energy targets technologies such as anaerobic digestion (AD) have increased in popularity. One such technology option is the Upflow Anaerobic Sludge Blanket (UASB) reactor, these have been shown to be a particularly robust option for high strength organic wastewaters, such as those generated by the malted ingredient manufacturing industry. Despite their effectiveness they are reported to have lengthy and complex start ups due to the range of physiochemical and biological interactions influencing sludge blanket stability. This process can be sped up by seeding the plant from sludge from similar plants, however this is not always possible. This paper aims to investigate the start up of a full-scale mesophilic UASB treating malted ingredient wastewater that was initially seeded with a granular sludge treating dairy wastewater. Operational performance during the first 75 days of start up was comparable to that of a fully established plant with a COD removal efficiency in excess of 81.89% and a biogas methane concentration greater than 57.24%. During this period the plant remained operationally robust with the Organic Loading Rates (OLR) exuding the greatest influence on plant performance. Similar to operations during stable conditions key operational parameters such as HRT times, temperatures and pH did not exert a strong influence on the plant.

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Start-up and steady-state results of a full-scale UASB reactor treating malting wastewater

Cited by 13 publications

References 6 publications

Modelling a full scale UASB reactor using a COD global balance approach and state observers

Modelling a full scale UASB reactor using a COD global balance approach and state observers

Sludge deterioration in a full scale UASB reactor after a pH drop working under low loading conditions

Start Up of a UASB Treating Malted Ingredient Manufacturing Wastewater

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