PMID: 15330422Aug 28, 2004Paper

Study on the operation of a methanogenic EGSB reactor under acid condition at pH 6.0

Huan jing ke xue= Huanjing kexue
Xue-feng LingXia-Sheng Gu

Abstract

In this paper the methanogenic process under acid condition at pH 6.0 was studied. Inoculated with neutral granular sludge, a 3.1 L EGSB reactor was operated for 345 days, the pH value in the reactor was gradually lowered down, and the acid-tolerant methanogenic granular sludge was achieved, and the anaerobic EGSB reactor was operated stably under lower pH and lower alkalinity. At pH 6.0, influent COD 3000 mg/L, COD OLR 5 kg/(m3 x d), the average COD removal efficiency of the EGSB reactor was 95.0%, while the effluent alkalinity (CaCO3) was only 328.5 mg/L, the biogas production per gram removal COD was 372.2 mL with 57.6% methane content. At pH 6.0, influent COD 4000 mg/L, COD OLR 7.5 kg/(m3 x d), the average COD removal efficiency was 90.9%, and the effluent alkalinity (CaCO3) was 404.8 mg/L, the biogas production per gram removal COD was 446.3 mL with 55.9% methane content. The EGSB reactor was operated at pH 6.0-6.1 for 112 days, which showed the stable methanogenic process was feasible at low pH and low alkalinity.

Related Concepts

Related Feeds

Biofuels (ASM)

Biofuels are produced through contemporary processes from biomass rather than geological processes involved in fossil fuel formation. Examples include biodiesel, green diesel, biogas, etc. Discover the latest research on biofuels in this feed.