1. Treatment of natural rubber processing wastewater using a combination system of a two-stage up-flow anaerobic sludge blanket and down-flow hanging sponge system.
- Author
-
Tanikawa D, Syutsubo K, Hatamoto M, Fukuda M, Takahashi M, Choeisai PK, and Yamaguchi T
- Subjects
- Anaerobiosis, Animals, Biological Oxygen Demand Analysis, Hydrogen, Methane, Sewage microbiology, Waste Disposal, Fluid, Water Pollutants, Chemical chemistry, Bacteria metabolism, Bioreactors microbiology, Industrial Waste analysis, Rubber, Wastewater chemistry
- Abstract
A pilot-scale experiment of natural rubber processing wastewater treatment was conducted using a combination system consisting of a two-stage up-flow anaerobic sludge blanket (UASB) and a down-flow hanging sponge (DHS) reactor for more than 10 months. The system achieved a chemical oxygen demand (COD) removal efficiency of 95.7% ± 1.3% at an organic loading rate of 0.8 kg COD/(m(3).d). Bacterial activity measurement of retained sludge from the UASB showed that sulfate-reducing bacteria (SRB), especially hydrogen-utilizing SRB, possessed high activity compared with methane-producing bacteria (MPB). Conversely, the acetate-utilizing activity of MPB was superior to SRB in the second stage of the reactor. The two-stage UASB-DHS system can reduce power consumption by 95% and excess sludge by 98%. In addition, it is possible to prevent emissions of greenhouse gases (GHG), such as methane, using this system. Furthermore, recovered methane from the two-stage UASB can completely cover the electricity needs for the operation of the two-stage UASB-DHS system, accounting for approximately 15% of the electricity used in the natural rubber manufacturing process.
- Published
- 2016
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