Control of diffuse emissions in UASB reactors treating sewage

2019 ◽  
pp. 237-274
Keyword(s):  
Diffuse Emissions ◽  
Uasb Reactors

The effect of extreme temperatures (70–80°C) on the effluent quality and sludge characteristics of UASB reactors

1997 ◽  
Vol 36 (6-7) ◽  
pp. 325-332 ◽  
Author(s):  
Raghida Lepistö ◽  
Jukka Rintala
Keyword(s):  
Volatile Fatty Acids ◽  
Granular Sludge ◽  
Anaerobic Sludge ◽  
Methanogenic Activity ◽  
Sludge Characteristics ◽  
Effluent Quality ◽  
Start Up ◽  
Thermomechanical Pulping ◽  
Increasing Temperature ◽  
Uasb Reactors

The study focused on the effluent quality and sludge characteristics during the start-up and operation of extreme thermophilic (70 to 80°C) upflow anaerobic sludge bed (UASB) reactors, inoculated with mesophilic and thermophilic granular sludge and fed with acetate, volatile fatty acids (VFA), and thermomechanical pulping (TMP) whitewater. Low effluent quality and long start-up periods were observed during the start-up of the 70 to 76°C, VFA-fed UASB reactors inoculated with mesophilic granulae, while better effluent quality and considerably shorter start-up periods were observed when thermophilic (55/70°C) inocula were used. With VFA feed, a significant amount of acetate was removed at 70°C and even at 80°C, while propionate removal was negligible. With TMP whitewater feed, low VFA effluent concentration was obtained at 70°C. The volatile solids (VS) and the VS/total solids (TS) content of the sludge decreased significantly during the first 2–3 months of operation when mesophilic inocula were used. The initial specific methanogenic activity (ISMA) of the extreme thermophilic sludge decreased with increasing temperature and was slightly higher on glucose than on acetate. At 70 to 80°C, various rod-like bacteria were dispersed through the granulae in either individual or in low density micro colonies surrounded with a varying degree of precipitates.

Impact of UASB reactors operation mode on the removal of estrone and 17α-ethinylestradiol from wastewaters

2021 ◽  
Vol 764 ◽  
pp. 144291
Author(s):  
Vitória L. Louros ◽  
Diana L.D. Lima ◽  
Jorge H. Leitão ◽  
Valdemar I. Esteves ◽  
Helena G.A. Nadais
Keyword(s):  
Operation Mode ◽  
Uasb Reactors

Conventional Anaerobic Reactors Applied to Denitrification: a Comparison Between Packed Bed and UASB Reactors Under Low COD Conditions

2021 ◽  
Vol 232 (2) ◽  
Author(s):  
Natalia Cangussu Duarte ◽  
Ariane Corrêa Barbosa ◽  
Taína Martins Magalhães ◽  
Cassiana Carolina Montagner ◽  
Luana Mattos de Oliveira Cruz ◽  
...  
Keyword(s):  
Packed Bed ◽  
Anaerobic Reactors ◽  
Uasb Reactors

Effect of shock and mixed nitrophenolic loadings on the performance of UASB reactors

2006 ◽  
Vol 40 (5) ◽  
pp. 935-942 ◽  
Author(s):  
Khursheed Karim ◽  
S.K. Gupta
Keyword(s):  
Uasb Reactors

Anaerobic treatment of municipal wastewater using the UASB-technology

2007 ◽  
Vol 56 (10) ◽  
pp. 37-44 ◽  
Author(s):  
I. Urban ◽  
D. Weichgrebe ◽  
K.-H. Rosenwinkel
Keyword(s):  
Co2 Emission ◽  
Municipal Wastewater ◽  
Clean Energy ◽  
Anaerobic Treatment ◽  
Relevant Effect ◽  
Different Temperatures ◽  
High Concentrations ◽  
New Applications ◽  
Uasb Reactors ◽  
Positive Effect

The anaerobic treatment of municipal wastewater enables new applications for the reuse of wastewater. The effluent could be used for irrigation as the included nutrients are not affected by the treatment. Much more interesting now are renewable energies and the retrenchment of CO2 emission. With the anaerobic treatment of municipal wastewater, not only can the CO2 emission be reduced but “clean” energy supply can be gained by biogas. Most important for the sustainability of this process is the gathering of methane from the liquid effluent of the reactor, because the negative climate-relevant effect from the degassing methane is much higher than the positive effect from saving CO2 emission. In this study, UASB reactors were used with a flocculent sludge blanket for the biodegradation of the carbon fraction in the wastewater with different temperatures and concentrations. It could be shown that the positive effect is much higher for municipal wastewater with high concentrations in hot climates.

Performance evaluation of different wastewater treatment technologies operating in a developing country

2011 ◽  
Vol 1 (1) ◽  
pp. 37-56 ◽  
Author(s):  
Sílvia C. Oliveira ◽  
Marcos von Sperling
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Septic Tank ◽  
Operational Parameters ◽  
Technical Literature ◽  
Effluent Quality ◽  
Loading Rates ◽  
Treatment Processes ◽  
Treatment Technologies ◽  
Uasb Reactors

This article analyses the performance of 166 wastewater treatment plants operating in Brazil, comprising six different treatment processes: septic tank + anaerobic filter, facultative pond, anaerobic pond + facultative pond, activated sludge, UASB reactors alone, UASB reactors followed by post-treatment. The study evaluates and compares the observed effluent quality and the removal efficiencies in terms of BOD, COD, TSS, TN, TP and FC with typical values reported in the technical literature. In view of the large performance variability observed, the existence of a relationship between design/operational parameters and treatment performance was investigated. From the results obtained, no consistent relationship between loading rates and effluent quality was found. The influence of loading rates differed from plant to plant, and the effluent quality was dictated by several combined factors related to design and operation.

Application of the UASB-Reactor for Anaerobic Treatment of Paper and Board Mill Effluent

1985 ◽  
Vol 17 (1) ◽  
pp. 61-75 ◽  
Author(s):  
L H A Habets ◽  
J H Knelissen
Keyword(s):  
Waste Water ◽  
Water Treatment ◽  
Energy Savings ◽  
Hydraulic Retention Time ◽  
Waste Water Treatment ◽  
Anaerobic Treatment ◽  
Raw Material ◽  
Uasb Reactor ◽  
Seed Sludge ◽  
Uasb Reactors

Within the holding of Bührmann-Tetterode NV, 7 Dutch paper and board mills are operating, all of them using mainly waste paper as raw material. While three of them completely closed their watercircuits, two other mills put into practice biological waste water treatment namely anaerobic and anaerobic/aerobic. Number 6 is realising an anaerobic plant this year and for number 7 research is still being carried out, dealing with several unfavourable aspects. In September 1981 research for anaerobic treatment (UASB reactors) was started. After good results had been achieved on laboratory scale (301), further investigations were started on semitechnical scale (50 m3). In both cases the anaerobic seed sludge granulated after a while and loadings up to 20 kg COD/m3.d could be handled. COD-removal was 70 per cent, even when the hydraulic retention time was only 2.5 hours. In April 1983 a 70 m3 practical scale UASB reactor was started up at the solid board mill of Ceres. In October 1983 a full scale plant was started up at Papierfabriek Roermond. This plant consists of a 1,000 m3 UASB reactor and a 70 m3 gasholder. It has been designed and constructed by Paques BV and is used for pretreatment of effluent, in order to reduce the loading of the activated sludge plant. Besides energy savings on the oxygen input, about 1 million m3/year of biogas is being generated and is used for steamproduction. Both plants are working satisfactorily. Investment costs appeared to be relatively low. At Ceres, pay-out time is 1.5 year, while at Papierfabriek Roermond waste water treatment is cheaper than before, although capacity is doubled.

Biodegradation of selected azo dyes under methanogenic conditions

1997 ◽  
Vol 36 (6-7) ◽  
pp. 65-72 ◽  
Author(s):  
Elías Razo-Flores ◽  
Maurice Luijten ◽  
Brian Donlon ◽  
Gatze Lettinga ◽  
Jim Field
Keyword(s):  
Azo Dyes ◽  
Textile Industry ◽  
Azo Dye ◽  
Biological Treatment ◽  
Present Report ◽  
Anaerobic Bacteria ◽  
Aminosalicylic Acid ◽  
Batch Experiments ◽  
Azo Reduction ◽  
Uasb Reactors

Biological treatment of wastewaters discharged by the textile industry could potentially be problematic due to the high toxicity and recalcitrance of the commonly-used azo dye compounds. In the present report, the fate of two azo dyes under methanogenic conditions was studied. Mordant Orange 1 (MO1) and Azodisalicylate (ADS) were completely reduced and decolorised in continuous UASB reactors in the presence of cosubstrates. In the MO1 reactor, both 5-aminosalicylic acid (5-ASA) and 1,4-phenylenediamine were identified as products of azo cleavage. After long adaptation periods, 5-ASA was detected at trace levels, indicating further mineralization. ADS, a pharmaceutical azo dye constructed from two 5-ASA units, was completely mineralized even in the absence of cosubstrate, indicating that the metabolism of 5-ASA could provide the reducing equivalents needed for the azo reduction. Batch experiments confirmed the ADS mineralization. These results demonstrate that some azo dyes could serve as a carbon, energy, and nitrogen source for anaerobic bacteria.

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