Influence of Mineral Nutrients on High Performance during Anaerobic Treatment of Wastewater from a Beer Brewery

概要

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The BOD of wastewater from beer breweries is around 2,000-3,000 mg/l, which is considered to be low-strength wastewater; however, high-strength wastewater, known sometimes as trube wastewater (BOD, about 80,000 mg/l), is also produced as a result of the filtration of wort. This high-strength wastewater was found not to respond well to treatment by a mono-phase thermophilic methane fermentation process using an anaerobic fluidized-bed reactor. Considering the composition of the wastewater and the pathway for methane fermentation, NH_4^+ at 500 mg/l, Nl^<2+> at 7 mg/l, Co^<2+> at 2 mg/l and Fe^<3+> at 30 mg/l were added to the wastewater. After five-fold dilution by volume, the diluted wastewater treated anaerobically in the same manner. As a result, the TOC (total organic carbon) concentration in the effluent was constant at about 400 mg/l, and no further problems were encountered. The volumetric loading rate of TOC was studied by treating variously diluted samples of high-strength wastewater (TOC 15,000,23,500,47,000 mg/l). The results obtained with the raw wastewater (TOC 47,000 mg/l) were remarkably good, with a maximum volumetric loading rate of TOC of 14 g/l.d, a gas yield of 1.2 l/g TOC consumed and a methane content of 59%. From tests involving omission of the mineral nutrients, it appears that Ni^<2+> and Co^<2+> play important roles in the anaerobic treatment of the wastewater.
社団法人日本生物工学会の論文
1991-07-25