成果報告書詳細
管理番号20110000000683
タイトル*平成22年度中間年報 省エネルギー革新技術開発事業/先導研究/水処理汚泥を利用した水処理省エネルギー利用技術の研究開発
公開日2011/6/7
報告書年度2010 - 2010
委託先名オオブユニティ株式会社 名古屋大学 岐阜大学 中部大学
プロジェクト番号P09015
部署名エネルギー対策推進部
和文要約和文要約等以下本編抜粋:1.研究開発の内容及び成果等 はじめに 本研究事業は、下水処理場における省エネ対策のために、従来、下水汚泥処理工程で消費されていた補助(化石)燃料や、排ガス処理のために使用されていた脱硫用薬品(アルカリ剤)を必要としない技術の研究開発を目指している。この方法として、高効率な堆肥化と炭化を組み合わせたシステムにより、これらの課題を解決するための研究テーマを設定している。また、このシステムで副生された炭化物を利用して、下水処理における汚水処理工程と汚泥処理工程において、さらなる省エネを図る技術の研究開発も目指している。
英文要約To develop new sewage sludge treatment system using new carbonization process combined composting process, 7 research assignments was implemented by 4 organizations of Obu Unity Corporation, Nagoya University, Gifu University and Chubu University. Research assignments, 1) Research on high-speed composting of sewage sludge, 2) Desulphurization and deodorizing technology by sewage sludge carbonization material, 3) Research on water-suspended carbonization material technology, 4) water treatment technique by carbonization material, 5) Utilization of water-suspended carbonization material in sewage sludge treatment, 6) System optimization of new sewage sludge treatment, and 7) Energy optimization of new sewage treatment system, was carried out and investigated in year 2010. The outcome of research was following;
1) Research on high-speed composting of sewage sludge
i. In order to understand composting characteristics and de-watering mechanism during composting, lab scale sewage sludge unit has been prepared, and pilot scale carbonization unit was designed to understand carbonization characteristics of composting sewage sludge this year.
ii. Drying experiment of de-water sewage sludge in hot-air dryer was conducted to understand the drying characteristics of sewage sludge and drying condition. As the result, drying ability was significantly improved by mixing sewage sludge carbonization material in sewage sludge, when the 298 K air was applied.
2) Desulphurization and deodorizing technology by sewage sludge carbonization material
i. Adsorption experiment of carbonization material of sewage sludge with low concentration NH3 and SO2 gas was curried out using a thermo-gravimetric analyzer. Carbonization material was capable of adsorbing NH3 and SO2 gas. Absorption ability of NH3 and SO2 was not deteriorated by the temperature of 343 and 353 K, respectively. Absorbed amount of NH3 was 0.86 mg/g-sample, and 1.3 mg/g-sample was for SO2.
ii. Thermodynamic equilibrium calculation for the reaction of NH3 with SO2 was carried out by using commercial software. Reaction temperature was changed from 298 to 473 K. As the calculation result, H2SO4 and N2 were mainly generated on the existence of O2, NH3, SO2, and H2O. (NH4)2SO4 was not produced on this condition at all.
3) Research on water-suspended carbonization material technology
i. Equipment for the production of water-suspended carbonization material was designed and developed. Unit operation capability was tested with water.
4) Water treatment technique by carbonization material
i. The adsorption test was carried out using two types of simulated wastewaters. One is high BOD liquid adjusted as a food industrial sewage, and the other is high COD liquid made a dilution of a dye in water. Obu Unity Corporation sludge carbonization material and a commercial activated carbon were added in simulated wastewater, and COD, BOD, TOC, TN and pH was measured. Sludge carbonization material had a performance of 15~60% of BOD and COD reduction. However, the adsorption amount of the activated carbon was higher than that of the sludge carbonization material.
ii. Nitrifying bacterium was tried to isolate from a wastewater treatment plant to evaluate the possibilities of using carbonization material from sewage sludge as biomass carriers for immobilization. Duganella sp. AKB-2008-TA4 from nitrous bacterium medium and Acinetobacter sp. from nitrate bacterium medium were characterized by the genetic analysis. The former consumes ammonium, and the latter consumes nitrite, and they also seemed to have the capacity of denitrification. They were cultivated in enrichment culture to prepare for immobilization on carbonization material.
5) Utilization of water-suspended carbonization material in sewage sludge treatment
6) System optimization of new sewage sludge treatment
7) Energy optimization of new sewage treatment system
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