成果報告書詳細
管理番号20120000001018
タイトル平成21年度-23年度成果報告書 省水型・環境調和型水循環プロジェクト
水資源管理技術研究開発 水資源管理技術の国内外への展開に向けた実証研究
公開日2012/9/28
報告書年度2009 - 2011
委託先名日揮株式会社
プロジェクト番号P11009
部署名環境部
和文要約本実証試験では、中国雲南省昆明市にあるテン池の試験対象水域から直接栄養塩(窒素やリン)を有効に除去することで、上流対策との相乗効果による対象水域自体の水質を早期に改善させる手法の立証を試みた。過去の調査結果に基づき、水循環システム実証機器をテン池外海北部の試験地に設置した。定期的に、試験地におけるCOD(化学的酸素要求量),T-N(全窒素),T-P(全リン)等の富栄養化物質の除去性能を確認すると共に、浄化に伴う生態系への影響について確認調査を行った。
約1年間の実証試験の結果、COD,T-N,T-Pの著しい除去効果が認められ、平均除去率はそれぞれ70%,50%,90%を達成し、汚染水を3類相当にまで改善することに成功した。また、浄化後は試験区域の透視度が増し、水生植物が繁茂して、生物の多様性が増すなどの効果が出ている。オゾンによる発がん性物質である臭素酸の生成もなく、環境ホルモンについても周辺域と比べて差がなかった。アオコの毒素・臭気は周辺域より減少していることが確認でき、オゾンによる生態系への影響は認められなかった。2012年2月には、中国工程院の院士をリーダーとする、専門家による技術評価会が開催され、当該技術が浄化技術として有効であるとの評価を得ることに成功した。
この技術評価会での評価により、今後、湖水のみならず工場廃水、生活排水等の高度処理への展開を視野に入れ、省水型・環境調和型水循環システムの構築に向けた応用展開が期待できることとなった。
英文要約Tests have been performed to determine the effectiveness of the NAC system which has been applied in a model water purification project conducted in part of Dianchi Lake located in Kunming city in China’s Yunnan Province.
. The system involves the removal of inorganic nutrients (phosphates and nitrates). The project is being conducted in tandem with the upstream treatment of water feeding the lake.
Based on previous studies, measuring apparatus was installed at the site of the model project at the northern end of the lake.
At the same time as the effectiveness of the purification technique in removing eutrophication substances in the area under investigation was being quantified through measurements of factors such as the COD (chemical oxygen demand), and the (T-N (total nitrogen), and T-P (total phosphorus), an investigation was conducted regarding the influence of the project on the environment surrounding the lake.
After the model project has been in operation for about one year, the values of the three indicators had all shown remarkable improvement; average extraction rates for COD, T-N, and T-P were confirmed at 70%, 50%, and 90%, respectively. The previously seriously contaminated water in the test area, which had measured Rank V on the Chinese scale, had improved to Rank 3.
Moreover, improved translucency of the water and an increase in aquatic plant life in the test area, and greater biodiversity in the surrounding area, have been observed.
Also, there was shown to be no generation of bromic acid, which is a carcinogen that can be produced by the action of ozone on bromine, nor was there any increase in the presence of endocrine disruptors compared with neighboring areas.
There was a decrease in toxins and objectionable odors from algae in the surrounding area and no influence from ozone on the ecosystem was observed.
The technology assessment meeting, held in February 2012 and chaired by a member of the Chinese Academy of Engineering, evaluated the system as an effective water purification technology. Following this evaluation, the use of this technology, not only in lakes, but also for the treatment of sewage and industrial waste water will be considered, and its application in the creation of “Water-saving Recycling systems" can be expected in the future.
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