Anaerobic treatment of low-strength municipal wastewater by a two-stage pilot plant under psychrophilic conditions

Álvarez, J.A.; E, Armstrong; Gómez, Marcel; Soto, M.

doi:10.1016/j.biortech.2008.01.013

Cited by 87 publications

(32 citation statements)

References 27 publications

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“…These results are similar to those reported for UASB-septic tank in combination with MBBR treating black wastewater [13]. The combined system removed 92% of COD total and 99% of BOD 7 . A lower removal efficiency of COD (71.3-77.1%) was achieved in an MBBR treating domestic wastewater at an HRT of 6 h [10].…”

Section: Discussionsupporting

confidence: 88%

“…Their results showed that the removal values of the different COD fractions increased by the increase of the HRT. However, there has been a tendency for this to become constant at a HRT more than 6 h. The reactor achieved 66% for COD removal at an HRT of 8 h. In another study, A'lvarez et al [7] investigated the performance of an UASB reactor treating domestic wastewater at an HRT of 11 h and a temperature of 14°C. After a startup period of 75 days, the UASB removal values were 58% for TSS, 41% for COD total and 54% for total biochemical oxygen demand (BOD 5 total ).…”

Section: Introductionmentioning

confidence: 99%

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Treatment of domestic wastewater in an up-flow anaerobic sludge blanket reactor followed by moving bed biofilm reactor

Tawfik

El‐Gohary

Temmink

2009

Bioprocess Biosyst Eng

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The performance of a laboratory-scale sewage treatment system composed of an up-flow anaerobic sludge blanket (UASB) reactor and a moving bed biofilm reactor (MBBR) at a temperature of (22-35°C) was evaluated. The entire treatment system was operated at different hydraulic retention times (HRT's) of 13.3, 10 and 5.0 h. An overall reduction of 80-86% for COD total ; 51-73% for COD colloidal and 20-55% for COD soluble was found at a total HRT of 5-10 h, respectively. By prolonging the HRT to 13.3 h, the removal efficiencies of COD total , COD colloidal and COD soluble increased up to 92, 89 and 80%, respectively. However, the removal efficiency of COD suspended in the combined system remained unaffected when increasing the total HRT from 5 to 10 h and from 10 to 13.3 h. This indicates that, the removal of COD suspended was independent on the imposed HRT. Ammonia-nitrogen removal in MBBR treating UASB reactor effluent was significantly influenced by organic loading rate (OLR). 62% of ammonia was eliminated at OLR of 4.6 g COD m -2 day -1 . The removal efficiency was decreased by a value of 34 and 43% at a higher OLR's of 7.4 and 17.8 g COD m -2 day -1 , respectively. The mean overall residual counts of faecal coliform in the final effluent were 8.9 9 10 4 MPN per 100 ml at a HRT of 13.3 h, 4.9 9 10 5 MPN per 100 ml at a HRT of 10 h and 9.4 9 10 5 MPN per 100 ml at a HRT of 5.0 h, corresponding to overall log 10 reduction of 2.3, 1.4 and 0.7, respectively. The discharged sludge from UASB-MBBR exerts an excellent settling property. Moreover, the mean value of the net sludge yield was only 6% in UASB reactor and 7% in the MBBR of the total influent COD at a total HRT of 13.3 h. Accordingly, the use of the combined UASB-MBBR system for sewage treatment is recommended at a total HRT of 13.3 h.

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Section: Discussionsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Treatment of domestic wastewater in an up-flow anaerobic sludge blanket reactor followed by moving bed biofilm reactor

Tawfik

El‐Gohary

Temmink

2009

Bioprocess Biosyst Eng

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“…The use of anaerobic reactors for the treatment of low-strength wastewater, including domestic sewage and industrial effluents, has been definitively established in tropical and sub-tropical regions, where wastewater temperatures are above 20°C [7]. On the other hand, at low temperature conditions (below 20°C), the hydrolysis rate is low and a high amount of suspended solids accumulate on the biomass bed, reducing the volume of active biomass and its specific methanogenic activity [16].…”

Section: Introductionmentioning

confidence: 99%

Performance evaluation and kinetic modeling of the start-up of a UASB reactor treating municipal wastewater at low temperature

Turkdogan-Aydınol

Yetilmezsoy

Comez

et al. 2010

Bioprocess Biosyst Eng

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A kinetic modeling-based study was carried out to evaluate the start-up performance of a 10-L up-flow anaerobic sludge blanket (UASB) reactor treating municipal wastewater under different organic and hydraulic loading conditions. The reactor was operated for 105 days (around 4 months) below 20 °C and with three different hydraulic retention times of 24, 12 and 5 h. Imposed volumetric organic loading rates (OLR) ranged from 0.57 (±0.05) to 11.78 (±0.85) kg TCOD/m(3)-day. Although relatively high incoming volumetric OLR values were employed to the system, the UASB reactor demonstrated a favorable performance on the anaerobic treatability of municipal wastewater, and no process failure was recorded in the start-up stage. On the basis of experimental results, the modified Stover-Kincannon model was successfully applied to define the start-up kinetics with a very high value of the correlation coefficient (R = 0.9729). Maximum substrate utilization rate constant and saturation constant of the modified Stover-Kincannon model were determined as U (max) = 1.996 g/L-day and K (B) = 1.536 g/L-day, respectively.

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“…They can be used as secondary or tertiary treatment systems and in combination with conventional and other NTS (hybrids) or be solely based on the influent water quality and intended reuse of the treated water. It has also been reported that a combination of different treatment technologies allows for improved water quality of the effluent (Alvarez et al, 2008;Mbuligwe, 2004;Kaseva, 2003).…”

Section: Introductionmentioning

confidence: 99%

Natural Water Treatment Systems for Safe and Sustainable Water Supply in the Indian Context: Saph Pani

Wintgens¹

2015

wio

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Anaerobic treatment of low-strength municipal wastewater by a two-stage pilot plant under psychrophilic conditions

Cited by 87 publications

References 27 publications

Treatment of domestic wastewater in an up-flow anaerobic sludge blanket reactor followed by moving bed biofilm reactor

Treatment of domestic wastewater in an up-flow anaerobic sludge blanket reactor followed by moving bed biofilm reactor

Performance evaluation and kinetic modeling of the start-up of a UASB reactor treating municipal wastewater at low temperature

Natural Water Treatment Systems for Safe and Sustainable Water Supply in the Indian Context: Saph Pani

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