Wyniki wyszukiwania - BazTech

1

Dynamic modelling of an anaerobic reactor treating coffee wet wastewater via multiple regression model

Guardia-Puebla Yans, Llanes-Cedeño Edilberto, Domínguez-León Ana Velia, Arias-Cedeño Quirino, Sánchez-Girón Victor, Morscheck Gert, Eichler-Löbermann Bettina

Journal of Water and Land Development

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2021

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no. 50

229--239

EN

A multiple regression model approach was developed to estimate buffering indices, as well as biogas and methane productions in an upflow anaerobic sludge blanket (UASB) reactor treating coffee wet wastewater. Five input variables measured (pH, alkalinity, outlet VFA concentration, and total and soluble COD removal) were selected to develop the best models to identify their importance on methanation. Optimal regression models were selected based on four statistical performance criteria, viz. Mallow’s Cp statistic (Cp), Akaike information criterion (AIC), Hannan–Quinn criterion (HQC), and Schwarz–Bayesian information criterion (SBIC). The performance of the models selected were assessed through several descriptive statistics such as measure of goodness-of-fit test (coefficient of multiple determination, R2; adjusted coefficient of multiple determination, Adj-R2; standard error of estimation, SEE; and Durbin–Watson statistic, DWS), and statistics on the prediction errors (mean squared error, MSE; mean absolute error, MAE; mean absolute percentage error, MAPE; mean error, ME and mean percentage error, MPE). The estimated model reveals that buffering indices are strongly influenced by three variables (volatile fatty acids (VFA) concentration, soluble COD removal, and alkalinity); while, pH, VFA concentration and total COD removal were the most significant independent variables in biogas and methane production. The developed equation models obtained in this study, could be a powerful tool to predict the functionability and stability for the UASB system.

2

Sustainable management of wastewater: Theoretical design of combined upflow anaerobic reactors and artificial wetlands systems

Guardia-Puebla Yans, Llanes-Cedeño Edilberto, Rodríguez-Pérez Suyén, Arias-Cedeño Quirino, Sánchez-Girón Victor, Morscheck Gert, Eichler-Löbermann Bettina

Journal of Water and Land Development

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2020

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no. 47

66--76

EN

Anaerobic digestion (AD) is an adequate alternative to treat wastewater generated from fruit and vegetable processing (FVWW); likewise, in recent years, artificial wetlands (AWs) have been applied as a post-treatment process for anaerobically pre-treated wastewater. The objective of this work was to design a sustainable treatment system for FVWW composed of upflow anaerobic reactors (UASB) with phase separation and an AW system that receive the anaerobically pretreated effluent. Using the design methodologies for the UASB reactors and artificial wetlands with sub-surface flow (AW-SSF), the parameters of the combined AD-AW system that treat a wastewater flow of 300 m3∙d–1 were calculated. The UASB acidogenic system was adjusted to a hydraulic retention time (HRT) of 10 h and organic loading rate (OLR) of 13.84 kg COD m–3∙d–1; meanwhile, the methanogenic and cascade UASB reactors with OLRs of 10.0 and 3.0 kg COD m3∙d–1, and HRTs of 11 and 10 h, respectively, achieve a high COD removal efficiency (above 94%), and an overall biogas production rate of 1.53 m3 of biogas per m3 of reactor capacity per day. According to the results obtained with the theoretical design, anaerobic-wetland combined system achieves an overall efficiency greater than 98%. The wastewater treated by the proposed system will allow the reuse of 30% of the water used in the washing of fruits and vegetables.

3

Overview of modern anaerobic wastewater treatment methods

Kowalik R., Bartkiewicz L.

Structure and Environment

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2018

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Vol. 10, no. 3

266--277

EN

The paper presents an overview of modern anaerobic wastewater treatment technologies. Characterised reactors for anaerobic wastewater treatment include UASB, ABR, AMBR, ASBR, AnMBR and EGSB reactors. Comparison with aerobic methods shows that use of anaerobic reactors allows for at least three times reduction of the amount sludge. Analysing the disadvantages and advantages of anaerobic wastewater treatment reactors, it can be concluded that their use is beneficial in wastewater treatment plants with problems of high COD concentrations in incoming wastewater and problems of the amount of sewage sludge produced.

PL

W artykule przedstawiono przegląd nowoczesnych metod beztlenowego oczyszczania ścieków. Scharakteryzowano reaktory UASB, ABR, AMBR, ASBR, AnMBR i EGSB. Następnie porównano z metodami tlenowymi, co pokazało, że zastosowanie reaktorów beztlenowych pozwala na co najmniej trzykrotne zmniejszenie ilości osadu. Analizując wady i zalety beztlenowych reaktorów do oczyszczania ścieków, można stwierdzić, że ich zastosowanie jest korzystne w oczyszczalniach ścieków, w których występują problemy z wysokimi stężeniami ChZT w ściekach napływających oraz problemy z ilością wytwarzanego osadu ściekowego.

4

Cascade reactor system for methanogenic fermentation

Jabłoński S., Krasowska A., Januszewicz J., Vogt A., Łukaszewicz M.

Challenges of Modern Technology

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2011

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Vol. 2, no. 4

37--41

EN

Methanogenic fermentation is promising method of obtaining environment-friendly energy. Moreover it can be used for disposal of sewage and other organic waste. However process complexity and susceptibility makes it difficult for application on a large scale. A new laboratory stand for studding of anaerobic digestion was developed. Three fermentation vessels and automated control system provides flexibility essential in investigation of digestion of different substrates and testing of different reactors configurations. Cheese whey is a troublesome dairy waste, potentially suitable for biogas production. Stable fermentation conditions for whey fermentation were obtained with the organic loading rate of 5 kg COD/m3 and methane production efficiency of 0,3 m3/kg COD. On the basis of obtained data the size of small biogas plant for average dairy was calculated.