Quali-quantitative characterization of biogas with the temporal behavior of organic load on wastewater treatment plant with upflow anaerobic sludge blanket reactors through measurement in full‑scale systems

Orlando Antonio Duarte Hernandez; Ana Caroline Paula; Gustavo Rafael Collere Possetti; Mauricio Pereira Cantão; Miguel Mansur Aisse

doi:10.5327/Z217694781059

Authors

Orlando Antonio Duarte Hernandez Universidade Federal do Paraná (UFPR) - Brazil https://orcid.org/0000-0003-4403-2517
Ana Caroline Paula Universidade Federal do Paraná (UFPR) - Brazil https://orcid.org/0000-0002-5822-5996
Gustavo Rafael Collere Possetti Companhia de Saneamento do Paraná (SANEPAR) - Brazil https://orcid.org/0000-0001-8816-5632
Mauricio Pereira Cantão Universidade Federal do Paraná (UFPR) - Brazil https://orcid.org/0000-0002-9937-738X
Miguel Mansur Aisse Universidade Federal do Paraná (UFPR) - Brazil https://orcid.org/0000-0003-4620-559X

DOI:

https://doi.org/10.5327/Z217694781059

Keywords:

biogas composition; biogas flow; chemical oxygen demand probe; sewage; ultrasonic flowmeter.

Abstract

This study aims to present the time behavior of wastewater flow parameters, organic matter, biogas flow, biogas composition, and its relations, measured through online sensors, in a municipal wastewater treatment plant (WWTP) operating full-scale upflow anaerobic sludge blanket (UASB) reactors, installed in the south of Brazil. WWTP has online measurement devices to evaluate some physicochemical variables of the sewage and the biogas. The COD analyzer (UV– Vis probe), ultrasonic flow meter, biogas flow meter, and biogas composition analyzer were the equipment used. The monitoring occurred for two time periods each of 72 h and one time period for 48 h in the year 2018. Data were checked with descriptive statistics, data independence was checked through the autocorrelation Box– Ljung test, normality behavior was checked with several tests (Shapiro– Wilk, Kolmogorov–Smirnov, Lilliefors, Anderson–Darling, D’Agostino K², and Chen–Shapiro), and Spearman’s correlation coefficient was used to evaluate the correlations among the parameters. The mean sewage flow was 345 ± 120 L.s^-1; removed organic load was, in average, 48%; biogas quality values were 82.32% ± 3.62% v/v (CH₄), 2.66% ± 1.19% v/v (CO₂), and 3453 ± 1268 ppm (H₂S); and the production per capita obtained was 4.51 ± 1.65 NL.hab-¹.d^-1. It was estimated an electric power generation of 3118.6 kWh.d^-1, which is equivalent to an installed power of 130 KW. The behavior of removed organic load and biogas flow (Nm³.h^-1), produced in the treatment plant, showed variable, periodic, and nonstationary time behavior.

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