Performance of modified anaerobic inclining-baffled reactor treating recycled paper mill effluent: effects of influent chemical oxygen demand concentration and hydraulic retention time

Environmental Technology
Haider M ZwainIrvan Dahlan

Abstract

The performance of modified anaerobic inclining-baffled reactor (MAI-BR) treating recycled paper mill effluent (RPME) was investigated by varying the influent chemical oxygen demand (CODin) concentration from 1000 to 4000 mg/L, and the hydraulic retention time (HRT) from 3 to 1 day, corresponding to an organic loading rate increase from 0.33 to 4 g COD/L day. Throughout 126 days of operation, a maximum removal efficiency of up to 96% of chemical oxygen demand (COD) and 99% of biological oxygen demand, methane (CH4) yield of 0.259 L CH4/g COD, and a stable effluent pH of 6.5 were achieved. Furthermore, the compartmental performance showed that most of the organic substrates were removed in the initial two compartments, resulting in low pH and alkalinity levels and a high concentration of volatile fatty acids. Overall, the results showed that the MAI-BR successfully treated RPME, and the performance was affected by the variation of HRT more than the CODin.

References

Jan 1, 2009·Brazilian Journal of Microbiology : [publication of the Brazilian Society for Microbiology]·Fernanda M FerrazVanildo L Del Bianchi
Jun 24, 2014·Ecotoxicology and Environmental Safety·Mohammadreza Kamali, Zahra Khodaparast
Apr 6, 2017·Environmental Science and Pollution Research International·Haider M ZwainIrvan Dahlan

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