Domestic wastewater treatment using a UASB reactor

Behling, Elisabeth; Díaz, Altamira; Colina, Gilberto; Herrera, Mario; Gutiérrez, Edixón; Chacín, Elsa; Fernández, Nola; Forster, C.F.

doi:10.1016/s0960-8524(97)00148-x

Cited by 85 publications

(39 citation statements)

References 10 publications

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“…However, the most important full scale installations were first developed and tested in Brazil and Colombia [13,[21][22][23][24][25][26]; then gained popularity in India and other countries with tropical or sub-tropical climates such as the UAE, Iran, Angola, Indonesia, Egypt, Palestine, Jordan, Thailand and others [27][28][29][30][31][32][33]. India currently is one of the leading countries in terms of the amount of sewage treated by the UASB process [29].…”

Section: Introductionmentioning

confidence: 99%

UASB followed by Sub-Surface Horizontal Flow Phytodepuration for the Treatment of the Sewage Generated by a Small Rural Community

2014

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Abstract:The paper presents the results of an experimental process designed for the treatment of the sewage generated by a rural community located in the north-east of Brazil. The process consists of a preliminary mechanical treatment adopting coarse screens and grit traps, followed by a biological treatment in a UASB reactor and a sub-surface horizontal flow phytodepuration step. The use of a UASB reactor equipped with a top cover, as well as of the phytodepuration process employing a porous medium, showed to present important health advantages. In particular, there were no significant odor emissions and there was no evidence of the proliferation of insects and other disease vectors. The plant achieved the following mean abatement efficiencies: 92.9% for BOD5, 79.2% for COD and 94% for Suspended Solids. With regard to fecal indicators average efficiencies of 98.8% for fecal coliforms and 97.9% for fecal enterococci were achieved. The UASB reactor showed an important role in achieving this result. The research was also aimed at evaluating the optimal operating conditions for the UASB reactor in terms of hydraulic load and organic volumetric OPEN ACCESS Sustainability 2014, 6 6999 loading. The achieved results hence indicated that the process may be highly effective for small rural communities in tropical and sub-tropical areas.

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Section: Introductionmentioning

confidence: 99%

UASB followed by Sub-Surface Horizontal Flow Phytodepuration for the Treatment of the Sewage Generated by a Small Rural Community

2014

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“…The VFA/Alkalinity in all reactors was lower than the recommended VFA/Alkalinity for Science Publications AJES anaerobic digestion (Behling et al, 1997). These results of VFA/Alkalinity showed that the anaerobic digestion reactor had high buffering capacity.…”

Section: Effects Of Co-digestion On Anaerobic Digestionmentioning

confidence: 75%

“…The VFA/Alkalinity of codigestion between wastewater and decanter cake was 0.31, 0.10 and 0.10 in the 10, 20 and 30 days HRT reactors, respectively. The VFA/Alkalinity ranging between 0.4 and 0.8 is recommended for anaerobic digestion (Behling et al, 1997).…”

Section: Ajesmentioning

confidence: 99%

Increasing Anaerobic Digestion Performance of Wastewater With Co-Digestion Using Decanter Cake

Kaosol¹,

Sohgrathok²

2014

American Journal of Environmental Sciences

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Low biogas production in the frozen seafood wastewater anaerobic digestion is observed due to the low organic and Total Solids (TS) contents in the wastewater. In this research the decanter cake will be used in the anaerobic co-digestion process to improve the biogas production rate. The effect of co-digestion and Hydraulic Retention Time (HRT) will be investigated using the continuously stirred tank reactors under anaerobic conditions. Moreover, the study determines the biogas production potential of different HRTs and that of wastewater digestion alone. The anaerobic co-digestion is operated in continuous with continuously stirred reactors at HRT of 10, 20 and 30 days. The mechanical stirring units of all reactors are operated automatically. The stirring action occurred continuously during the experiments. The anaerobic co-digestion results show that the anaerobic co-digestion provides higher biogas production rate and higher methane yield than that of the wastewater digestion alone. The optimum HRT of the anaerobic co-digestion is 20 days. This reactor produces 2.88 L day −1 , with 64.5% of methane and the maximum methane production rate of 1.87 L day −1 and the methane yield of 0.321 l CH 4 /g COD removed . The anaerobic co-digestion of wastewater with decanter cake provides the higher methane yield potential production than that provided by the wastewater digestion alone at the ambient temperature. The best HRT is 20 days for anaerobic codigestion between the wastewater and decanter cake. The experimental results reveal that HRT and codigestion are the parameters that can affect the biogas production and methane yield.

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“…During decrease of COD removal, TVA/alkalinity ratio in both reactors tend to increase about 0.5-0.7. TVA/alkalinity ratio less than 0.4 indicated that anaerobic reactor could accommodate minor fluctuations of pH and more than 0.4 indicated that the instability of anaerobic reactor could be expected [18].…”

Section: Resultsmentioning

confidence: 99%

The Effect of Synthetic Cationic Polymer Addition on Nucleation of Anaerobic Granules under Different Organic Loading Rate

Hudayah¹,

Suraraksa²,

Chaiprasert³

2012

IJBBB

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Abstract-Nucleation phase with the addition of synthetic cationic polymer, polyacrylamide 8265 (MEM 8265), under different organic loading rate (OLR) was investigated. The results showed that the addition of MEM 8265 showed significant positive effects related to physico-chemical characteristics of microbial aggregates such as short nucleation time, higher size distribution of aggregates >100 µm, nuclei ratio and SVI value. The nucleation phase was achieved within 69 days. The nuclei size was 126 µm and nuclei ratio achieved 51% of total sludge. SVI was 60 ml.mg -1 SS. However, the activities of acidogenic bacteria (propionic acid-and butyric acid-degrading microorganisms) and methanogens were similar to control (without polymer addition).

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Domestic wastewater treatment using a UASB reactor

Cited by 85 publications

References 10 publications

UASB followed by Sub-Surface Horizontal Flow Phytodepuration for the Treatment of the Sewage Generated by a Small Rural Community

UASB followed by Sub-Surface Horizontal Flow Phytodepuration for the Treatment of the Sewage Generated by a Small Rural Community

Increasing Anaerobic Digestion Performance of Wastewater With Co-Digestion Using Decanter Cake

The Effect of Synthetic Cationic Polymer Addition on Nucleation of Anaerobic Granules under Different Organic Loading Rate

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