Anaerobic Treatment of Low-Strength Wastewater by a Biofilm Reactor

Manariotis, Ioannis D.; Grigoropoulos, Sotirios G.; Hung, Yung‐Tse

doi:10.1007/978-1-60327-031-1_14

Cited by 7 publications

(6 citation statements)

References 102 publications

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“…Chemical oxygen demand (COD) of the substrate is used as a measure of the oxygen equivalent of the organic matter content. In this situation, COD is removed by converting organic compounds to methane (CH 4 ), a significant amount of CO 2 , H 2 , and negligible amounts of other gases like H 2 S (Manariotis et al 2010;Mathew et al 2015). So the methane probable of a waste (by microorganisms) is related to the concentration of organics (COD) in it and in the effectiveness of the system.…”

Section: Removal Efficiency Of P Stratiotes After Phytoremediationmentioning

confidence: 99%

Experimental and kinetics study for phytoremediation of sugar mill effluent using water lettuce (Pistia stratiotes L.) and its end use for biogas production

et al. 2017

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In present study, the performance of phytoremediation by on sugar mill effluent (SME) and its end use for biogas production are investigated. The objectives of the study are to determine the nutrient and pollution reduction efficiency of from SME and evaluation of its biomass as a feedstock for biogas production. Various concentrations of SME (25, 50, 75, and 100%) were remediated by (initial weight; 150 g) outdoor for 60 days under batch mode experimental setup. The results showed that achieved marked reduction in nutrient (TKN, 72.86%; TP, 71.49%) and pollutant load (EC, 25.69%; TDS, 57.26%; BOD, 69.40%; COD, 61.80%; Ca, 56.79%; Mg, 55.01%; Na, 42.86%; K, 54.38%; MPN, 78.13%; SPC, 60.13%) from 75% SME at the end of the experiment. The highest biomass (328.48 ± 2.04 g) and chlorophyll content (3.62 ± 3.04 mg/g) were also achieved with 75% SME. The dried biomass of (from 75% SME) was inoculated with cow dung (10% w/v) and diluted with distilled water (1:10). The whole content was used as a substrate for the biogas production within hydraulic retention time (HRT) of 30 days at room temperature. Substrate parameters such as pH, TS (%), COD (mg/L), TKN (%), TOC (%), VS (%), and C/N ratio were reduced from 7.85 to 6.0, 66.65 to 28.65%, 12,900 to 2800 mg/L, 0.95 to 0.75%, 45.54 to 19.5%, 76.87 to 28.78%, and 47.94 to 26.00, respectively, in 30 days of HRT. About 8478.6 mL of cumulative biogas production was evaluated by modified Gompertz equation. Thus, the present investigation not only achieved efficient nutrient and pollution reduction from SME but also proved the potential of for biogas production.

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Section: Removal Efficiency Of P Stratiotes After Phytoremediationmentioning

confidence: 99%

Experimental and kinetics study for phytoremediation of sugar mill effluent using water lettuce (Pistia stratiotes L.) and its end use for biogas production

et al. 2017

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“…Oxygen is not consumed in anaerobic digestion, and so, no reduction of COD can occur. In this situation, COD is removed by converting organic compounds to methane (CH 4 ), a significant amount of CO 2 , H 2 and negligible amounts of other gases like H 2 S (Manariotis et al 2010 ; Mathew et al 2014 ). So the methane potential of a waste (by microorganisms) is related to the concentration of organics (COD) in it and in the efficiency of the system.…”

Section: Introductionmentioning

confidence: 99%

An overview of physico-chemical mechanisms of biogas production by microbial communities: a step towards sustainable waste management

et al. 2016

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Biogas is a combination of methane, CO2, nitrogen, H2S and traces of few other gases. Almost any organic waste can be biologically transformed into biogas and other energy-rich organic compounds through the process of anaerobic digestion (AD) and thus helping in sustainable waste management. Although microbes are involved in each step of AD, knowledge about those microbial consortia is limited due to the lack of phylogenetic and metabolic data of predominantly unculturable microorganisms. However, culture-independent methods like PCR-based ribotyping has been successfully employed to get information about the microbial consortia involved in AD. Microbes identified have been found to belong mainly to the bacterial phyla of Proteobacteria, Chloroflexi, Firmicutes and Bacteroidetes. Among the archaeal population, the majority have been found to be methanogens (mainly unculturable), the remaining being thermophilic microbes. Thus, the AD process as a whole could be controlled by regulating the microbial consortia involved in it. Optimization in the feedstock, pH, temperature and other physical parameters would be beneficial for the microbial growth and viability and thus helpful for biogas production in AD. Besides, the biogas production is also dependent upon the activity of several key genes, ion-specific transporters and enzymes, like genes coding for methyl-CoM reductase, formylmethanofuran transferase, formate dehydrogenase present in the microbes. Fishing for these high-efficiency genes will ultimately increase the biogas production and sustain the production plant.

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“…Therefore, non-feeding intervals do not have a negative impact on the quick response of anaerobic filters (Manariotis and Grigoropoulos, 2008). These characteristics render the anaerobic filter extremely useful for the treatment of both high and low-strength wastewaters (Manariotis and Grigoropoulos, 2003).…”

Section: Introductionmentioning

confidence: 99%

Kinetic evaluation of the psychrophylic anaerobic digestion of synthetic domestic sewage using an upflow filter

Martı́n

Rubia

Martı́n

et al. 2010

Bioresource Technology

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A study of the anaerobic digestion process of synthetic domestic sewage (total COD: 705 mg/L) was carried out. The digestion was conducted in an upflow anaerobic filter with corrugated plastic rings as packing media at psychrophilic temperature (15-17 degrees C). For HRTs of between 10.0 and 17.1h, the total COD removal efficiency was almost constant and independent on the HRT, achieving an average value of around 80%. However, when the HRT decreased from 7.0 to 3.2h the efficiency diminished from 77% to 65%. This decrease in removal efficiency was parallel to the increase in the VFA/Alkalinity ratio for this HRT range. The flow pattern observed in the reactor studied was intermediate between plug-flow and CSTR systems, although the plug-flow was predominant. It can also be observed that Young and McCarty's model almost coincided with the CSTR model, when the biodegradable COD was used for fitting the data. The Manariotis equation allowed a better fit of the experimental data (total COD removal efficiency with influent substrate concentration and HRT) than the Young model. The methane yield coefficient obtained was 0.15 L CH(4)/g COD consumed.

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Anaerobic Treatment of Low-Strength Wastewater by a Biofilm Reactor

Cited by 7 publications

References 102 publications

Experimental and kinetics study for phytoremediation of sugar mill effluent using water lettuce (Pistia stratiotes L.) and its end use for biogas production

Experimental and kinetics study for phytoremediation of sugar mill effluent using water lettuce (Pistia stratiotes L.) and its end use for biogas production

An overview of physico-chemical mechanisms of biogas production by microbial communities: a step towards sustainable waste management

Kinetic evaluation of the psychrophylic anaerobic digestion of synthetic domestic sewage using an upflow filter

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