Restart of anaerobic filters treating low-strength wastewater

Manariotis, Ioannis D.; Grigoropoulos, Sotirios G.

doi:10.1016/j.biortech.2007.07.048

Cited by 25 publications

(11 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It enables smaller hydraulic detention time and larger cell retention, for natural formation of self-immobilized microbial granules, making them competitive systems compared to other possibilities for wastewater treatment and compatible with the efficiency of some aerobic reactors (MANARIOTIS & GRIGOROPOULOS, 2008).…”

Section: Introductionmentioning

confidence: 99%

COD, TSS, nutrients and coliforms removals in UASB reactors in two stages treating swine wastewater

Ramires

Oliveira

2014

Eng. Agríc.

View full text Add to dashboard Cite

SUMMARY:The performance of two upflow anaerobic sludge blanket (UASB) reactors was evaluated in pilot scale (908 and 188 L), installed in series (R1 and R2), fed with swine wastewater with TSS around 5 and 13 g L -1 . The UASB reactors were submitted to HDT of 36 and 18 h with VOL of 5.5 to 34.4 g COD (L d) -1 in the R1 and HDT of 7.5 e 3.7 h with VOL from 5.1 to 45.2 g COD (L d) -1 in the R2. The average removal efficiencies of COD ranged from 55 to 85% in the R1 and from 43 to 57% in the R2, resulting in values from 82 to 93% in the UASB reactors in two stage. Methane concentrations in the biogas were 69 to 74% with specific production from 0.05 to 0.27 L CH 4 (g removed COD) -1 in the R1 and of 0.10 to 0.12 L CH 4 (g removed COD) -1 in the R2. The average removal efficiencies were 61 to 75% for total P, 39 to 69% for KN, 82 to 93% for org N and 20 to 94% for Fe, Zn, Cu and Mn. The am N concentration were not reduced indicating the need to post-treatment for effluent disposal into water bodies. There were reductions of total coliforms from 99.8123 to 99.9989% and of thermotolerant coliforms from 99.9725 to 99.9999%. The conditions imposed to the UASB reactors in two stage provided high conversions of removed COD into methane (up to 77%) and reductions of organic an inorganic pollution loads from swine wastewater.KEYWORDS: volumetric organic load, methane, N and P removal, metal removal, suspended solids. REMOÇÕES DE DQO, SÓLIDOS, NUTRIENTES E COLIFORMES EM REATORES UASB EM DOIS ESTÁGIOS TRATANDO ÁGUAS RESIDUÁRIAS DE SUINOCULTURARESUMO: Foi avaliado o desempenho de dois reatores anaeróbios de fluxo ascendente com manta de lodo (UASB) em escala-piloto (908 e 188 L), instalados em série (R1 e R2), para o tratamento de águas residuárias de suinocultura com concentrações médias de SST em torno de 5 e 13 g L -1 . Os TDH foram de 36 e 18 h com COV de 5,5 a 34,4 g DQO (L d) -1 no R1 e TDH de 7,5 e 3,7 h com COV de 5,1 a 45,2 g DQO (L d) -1 no R2. As eficiências médias de remoção de DQO variaram de 55 a 85% no R1 e de 43 a 57% no R2, resultando valores de 82 a 93% nos reatores UASB em dois estágios. As concentrações de metano no biogás foram de 69 a 74%, com produções de 0,05 a 0,27 L CH 4 (g DQOremovida) -1 no R1 e de 0,10 a 0,12 L CH 4 (g DQOremovida) -1 no R2. Os valores médios de eficiência de remoção de Ptotal foram de 61 a 75%; de NK de 39 a 69%; de Norg. de 82 a 93%, e de Fe, Zn, Cu e Mn de 20 a 94%. As concentrações de N-am. não foram reduzidas, indicando a necessidade de pós-tratamento para disposição do efluente em corpos d'água. Houve redução de coliformes totais de 99,8123 a 99,9989%, e de coliformes termotolerantes de 99,9725 a 99,9999%. As condições impostas aos reatores UASB em dois estágios propiciaram reduções acentuadas da carga poluidora orgânica e inorgânica das águas residuárias de suinocultura, com conversão de até 77% da DQO removida em metano. PALAVRAS-CHAVE:carga orgânica volumétrica, metano, remoção de N e P, remoção de metais, sólidos suspensos.

show abstract

Section: Introductionmentioning

confidence: 99%

COD, TSS, nutrients and coliforms removals in UASB reactors in two stages treating swine wastewater

Ramires

Oliveira

2014

Eng. Agríc.

View full text Add to dashboard Cite

show abstract

“…The UAF removes mainly organic matter in wastewater with low and high organic loads, while the HSSCW is capable of removing organic matter and nutrients and is commonly used to obtain secondary or tertiary effluent concentration levels [8,[23][24][25]. In other words, combining an anaerobic reactor with a constructed wetland brings important benefits to the constructed wetlands system, such as the reducing of the required planted area, reducing of the retention time, and increasing of their life cycle [18,20].…”

Section: Introductionmentioning

confidence: 99%

“…The up-flow anaerobic filter (UAF), as part of this technology, is able to treat wastewater with different pollutant loadings and it is successfully used, specifically for small communities in warm climates, to achieve the desired water quality. In general, the UAF removes dissolved and suspended solids through close contact with anaerobic bacteria attached to the filter media [22,23].…”

Section: Introductionmentioning

confidence: 99%

The Effect of the Hydraulic Retention Time on the Performance of an Ecological Wastewater Treatment System: An Anaerobic Filter with a Constructed Wetland

Merino-Solís

Villegas

Anda

et al. 2015

Water

View full text Add to dashboard Cite

This work assesses the performance of a municipal pilot wastewater treatment system employing an up-flow anaerobic filter (UAF) followed by a horizontal subsurface constructed wetland (HSSCW). This pilot scale demonstration project was implemented in a zone with subtropical climate in order to protect Lake Chapala from wastewater loads that are discharged by small communities in the Lake's vicinity. The filters were filled with tezontle as the media for biofilm support and the HSSCW was planted with two ornamental plants species, Canna hybrids and Strelitzia reginae. The experiment evaluated three hydraulic retention times (HRT) of 18, 28 and 38 h in the UAF, which corresponds to two, three and four days in HSSCW over 66 weeks. The mean efficiencies found for the complete system were 80% and 90% of BOD, 80% and 86% of COD, 30% and 33% of Ntot and between 24% and 44% of Ptot. It was possible to remove almost 80% of organic matter in 18 h in the UAF while the HSSCW reached 30% of removal for Ntot in a HRT of three days. As expected, the UAF was responsible for removing most of the organic matter and the HSSCW removed most of the nitrogen. OPEN ACCESSWater 2015, 7 1150

show abstract

“…Researchers determined when restarting a reactor, use at least one third of the sludge from the previous application as seed, maintain pH above 6.8, and gradually start feeding the reactor by increasing the OLR no more than 2 kg COD/(m 3 •d). Four upflow AFs were treating municipal wastewater for three years, but were not operated for 24 months were examined for effects of idle periods on biomass retention and reactivation (Manariotis and Grigoropoulos, 2008). It was determined that startup was possible in a relatively short period of time, but depended on the type of packing material and type of wastewater previously fed to the reactor.…”

Section: Seed Sludge and Granule Formation Gallertmentioning

confidence: 99%