多段嫌気性反応槽(UASB)と下降流懸架式スポンジ(DHS)反応槽を組み合わせた高濃度有機性廃水処理システムの開発 [in Japanese] Development of Multistage Anaerobic Wastewater Treatment System Consisting of Anaerobic and Downflow Hanging Sponge (DHS) Reactors [in Japanese]
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The processing performance of a high-strength-wastewater treatment system was investigated by feeding the system with sugar-containing synthetic wastewater for more than one year. The system consisted of a (35°C) mesophilic upflow anaerobic sludge blanket (UASB) reactor for pretreatment, and an ambient UASB reactor and a downflow hanging sponge (DHS) reactor for post-treatment. The DHS reactor was constructed using a liquid distributor and a packing material made with sponge cubes. A portion of the final effluent was recycled to the inlet of post-treatment with a recirculation ratio in the range of 2.0-0.3. The synthetic wastewater was made with organic waste from a food factory; it consisted of about 3,000mg of COD<sub>Cr</sub> · <I>l</I><sup>-1</sup>, 2,000mg of BOD · <I>l</I><sup>-1</sup> and 500mg of SS · <I>l</I><sup>-1</sup>. The system exhibited excellent performance in organic removal, achieving 98% COD<sub>Cr</sub> and 96% SS removal rates (final effluent: 43mgCOD<sub>Cr</sub> · <I>l</I><sup>-1</sup>, 12mgBOD · <I>l</I><sup>-1</sup> and 15mgSS · <I>l</I><sup>-1</sup>) with 75% of the methane recovered from the removed COD<sub>Cr</sub> under conditions of 24hrs of HRT, a COD<sub>Cr</sub> volumetric loading rate of 3.0 kg · m<sup>-3</sup> · d<sup>-1</sup> (35°C UASB as pretreatment, 1.4 kg · m<sup>-3</sup> · d<sup>-1</sup>; post-treatment, 1.6 kg · m<sup>-3</sup> · d<sup>-1</sup>), and low final effluent temperatures such as 1-10°C. The proposed system effectively saves energy and decreases the amount of excess sludge. It is considered as a novel process to treat high-strength wastewaters up to a discharge quality level.
- Japan journal of water pollution research
Japan journal of water pollution research 30(2), 83-88, 2007-02-10
Japan Society on Water Environment