{"created":"2023-07-25T08:13:48.272372+00:00","id":14714,"links":{},"metadata":{"_buckets":{"deposit":"8703f880-dbf3-45b7-ae13-9c52fd29a9a1"},"_deposit":{"created_by":18,"id":"14714","owners":[18],"pid":{"revision_id":0,"type":"depid","value":"14714"},"status":"published"},"_oai":{"id":"oai:ir.kagoshima-u.ac.jp:00014714","sets":["70:72"]},"author_link":["133527"],"item_5_date_6":{"attribute_name":"作成日","attribute_value_mlt":[{"subitem_date_issued_datetime":"2019-03-29","subitem_date_issued_type":"Collected"}]},"item_5_date_granted_54":{"attribute_name":"学位授与年月日 ","attribute_value_mlt":[{"subitem_dategranted":"2019-03-15"}]},"item_5_degree_grantor_53":{"attribute_name":"学位授与機関","attribute_value_mlt":[{"subitem_degreegrantor":[{"subitem_degreegrantor_language":"ja","subitem_degreegrantor_name":"鹿児島大学"}],"subitem_degreegrantor_identifier":[{"subitem_degreegrantor_identifier_name":"17701","subitem_degreegrantor_identifier_scheme":"kakenhi"}]}]},"item_5_degree_name_42":{"attribute_name":"学位名","attribute_value_mlt":[{"subitem_degreename":"博士(農学)","subitem_degreename_language":"ja"},{"subitem_degreename":"Doctor of Philosophy","subitem_degreename_language":"en"}]},"item_5_description_17":{"attribute_name":"ファイル（説明）","attribute_value_mlt":[{"subitem_description":"博士論文全文, 博士論文要旨(日本語), 博士論文要旨(English), 最終試験結果の要旨, 論文審査の要旨","subitem_description_language":"ja","subitem_description_type":"Other"}]},"item_5_description_4":{"attribute_name":"要約(Abstract)","attribute_value_mlt":[{"subitem_description":"農業集落排水施設は，1973年に農村総合整備モデル事業の一工種として整備が始められて以来，2016年度までに5,356地区で供用を開始しており，これらの維持管理が大きな課題となっている．また，環境問題への意識の高まりに加えて，閉鎖性水域での富栄養化防止対策や上乗せ規制の強化等から，上乗せ規制等による高度な水処理をより経済的に確保することが求められている．農業集落排水施設に関しては，これまで処理性能やその影響要因に関する先行研究はなされているが，運転の効率化に関する調査研究はほとんどなされていないのが実情である．\nこのような状況を踏まえ，供用中の農業集落排水施設について，流入負荷に係る水道水量，降水量，供用率，立地条件など変動要因と流入汚水量動態を把握するとともに，状態空間モデルの適用を通じた農業集落排水施設流入水の日水量負荷変動と変動特性抽出を試みた．農業集落排水施設の維持管理費の軽減を図り，運転管理の効率化を進める観点から，連続流入間欠ばっ気活性汚泥方式を対象に，ばっ気槽管理とBOD除去性能に係る検討し，経済的に所要の性能を確保できるようなばっ気槽運転管理手法を提案した．得られた研究成果を要約すると，以下のとおりである．\n1. 農業集落排水施設の日流入汚水量には，土地利用・立地条件が関与しており，処理区の土地利用・立地条件を水道水量と降水量に加味することで，これらを説明変数とする重回帰推定式から日流入汚水量を精度よく推定できることを明らかにできた．時間流入汚水量の日間変動には，管路延長，供用率，流入人口率が関与しており，時間水量日変動幅とピーク係数はこれらを説明変数とする重回帰推定式から設計基準値を設定できることが示唆された．\n2. 日流入水量はトレンド成分，季節変動成分，週間変動成分，及び降雨による変動成分に分離されるとともに，状態空間モデル解析により日流入水量の有する周期的な変動特性や観測データと対応した特徴を抽出できることが確認できた．日水量負荷変動には，供用人口に対応して変動する水道使用量，降水量，流入人口動態，お盆・年末・年始のイベントに対応する流量変動が関与していることが示唆された．状態空間モデルによる解析は，季節変動成分の解釈や降水に伴う変動成分予測精度に課題が残るものの，農業集落排水施設の日流入水量の変動特性の把握には活用できるものと考えられる．\n3. 連続流入間欠ばっ気活性汚泥方式の農業集落排水施設のBOD除去性能確保に関して，ばっ気槽1室のばっ気終了時のORP管理範囲100～125mVを明らかにするとともに，ばっ気装置散気方式，ばっ気強度，ばっ気時間等によるDO挙動特性とBOD除去性能確保に必要なばっ気終了時のDO濃度を把握した．総括酸素移動容量係数（KLa）にはばっ気槽の活性汚泥粘度が関与しており，ばっ気強度，水温，MLSSを説明変数とする重回帰式から推定できることが確認された．BOD除去速度恒数はばっ気強度，ばっ気時間，及び槽内水温を説明変数とする重回帰式から推定できることが示唆された．ばっ気強度（0.03 m3・m-3・mim-1）とばっ気時間（30min）を組み合わせたばっ気槽の運転操作を通じて，少ないばっ気空気量で高いBOD除去性能を得るなど農業集落排水施設の運転管理効率化が図られることが示された．\n本研究成果が計画諸元の適切な設定や農業集落排水施設における適切な設計諸元の設定や管理手法の確立等に反映され，維持管理コストの一層の低減や維持管理性の向上等を通じて，全国の農業集落排水施設の整備と管理が円滑に進められることが期待される．","subitem_description_language":"ja","subitem_description_type":"Other"},{"subitem_description":"By the year of 2016, there are 5,356 rural sewerage facilities in operation, which are provided as one of rural comprehensive improvement model projects since 1973 in Japan. It is recognized that operation and maintenance of these rural sewerage facilities become of great importance to the administrative functions of municipalities. While the concerns to the environmental issue have been raised, it should be noted that high-degree wastewater treatment is required with more economically because of prevention eutrophication in closed water area and strengthening of effluent regulation. There are several previous studies discussed about treatment performance and its influence factors, but few studies have been done to investigate the operation efficiency of rural sewerage facilities.\nThis study used qualitative case studies approach to investigate fluctuation factors such as drinking water usage, precipitation, utilization rate, location conditions etc. and inflow dynamics of rural sewerage facilities in service. It also made an attempt to separate the variation of inflow load and extract characteristics by using State-space analysis. Focused on several intermittent aerobic suspended-growth processes facilities, this study also discussed BOD removal performance and provided efficient management process with the aim of reducing maintenance cost. The results are summarized below:\n1. This study analyzed maximum daily flow rates, average daily flow rates and minimum daily flow rates with examination of fitting non-excess probability distribution in order to comprehend the actual situation of sewerage flow rates on observed rural sewerage facilities. The discussion on influence factors of daily flow rates variation is based on real time data measured by flow meters installed in observed rural sewerage facilities. The daily flow rates are confirmed to be influenced by the land use and site conditions of rural sewerage facilities. Besides, it is clarified that hourly flow rate fluctuations and peak coefficients was influenced by the duct line length, utilization rate and floating population rate. The results of this study are expected to be reflected in setting appropriate design units and management methods of rural sewerage facilities in the future.\n2. The daily inflow rate of wastewater was separated (a) the trend component, (b) the seasonal change component, (c) the weekly change component, and (d) the precipitation-corresponding component. These components were well correlated with influent quantity. The value predicted by the state space model well explained actual inflow discharge data. The daily inflow rate of wastewater related with (i) influent quantity that corresponding with population in basin, (ii) the dynamics of population in basin, (iii) the amount of precipitation, and (iv) events including summer holiday, near the close to another year, and so on. The analysis with the state space model has a few agenda of prediction precision of the precipitation-corresponding component and understanding of the seasonal change mechanism.\n3. ORP of first aeration tank in intermittent aerobic suspended-growth sewerage treatment facilities should be held in range of 100～125mV in order to ensure BOD removal performance, and DO behavior characteristics vary with operation condition such as types of diffused aeration devices, aeration intensity, and aeration time. KLa can be classified by types of diffused aeration devices, and it can be deduced from aeration intensity, temperature and MLSS of aeration tank mixed fluid, also, BOD reaction rate constant can be deduced from aeration intensity, aeration time and temperature of aeration tank mixed fluid. It is shown that operation efficiency of intermittent aerobic suspended-growth sewerage treatment facilities can be improved by choosing the recommend combination of aeration intensity (0.03 m3・m-3・mim-1) and aeration time (30min) which is appropriate to the diffused aeration device, as the result, required BOD removal performance can be obtained with less consumption of air quantity.\nThese conclusions are wished to be considered when set up appropriate design values or determine operating procedure of rural sewerage facilities. It is expected that construction and maintenance of nationwide rural sewerage facilities will be developed smoothly by optimizing operating procedure and decreasing maintenance cost.","subitem_description_language":"en","subitem_description_type":"Other"}]},"item_5_dissertation_number_55":{"attribute_name":"学位授与番号","attribute_value_mlt":[{"subitem_dissertationnumber":"甲連研第929号"}]},"item_5_publisher_23":{"attribute_name":"公開者・出版者","attribute_value_mlt":[{"subitem_publisher":"鹿児島大学","subitem_publisher_language":"ja"},{"subitem_publisher":"カゴシマ ダイガク","subitem_publisher_language":"ja-Kana"},{"subitem_publisher":"Kagoshima University","subitem_publisher_language":"en"}]},"item_5_subject_15":{"attribute_name":"NDC","attribute_value_mlt":[{"subitem_subject":"614","subitem_subject_scheme":"NDC"}]},"item_5_text_44":{"attribute_name":"備考","attribute_value_mlt":[{"subitem_text_value":"【指導教員：中野拓治】 "}]},"item_5_text_47":{"attribute_name":"date.appl","attribute_value_mlt":[{"subitem_text_value":"【学位申請日】2018-11-28"}]},"item_5_version_type_14":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_970fb48d4fbd8a85","subitem_version_type":"VoR"}]},"item_access_right":{"attribute_name":"アクセス権","attribute_value_mlt":[{"subitem_access_right":"open access","subitem_access_right_uri":"http://purl.org/coar/access_right/c_abf2"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"李, 雨桐","creatorNameLang":"ja"},{"creatorName":"Li, Yu Tong","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"133527","nameIdentifierScheme":"WEKO"}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2019-08-21"}],"displaytype":"detail","filename":"Diss_李　雨桐_RNK929_2019.pdf","filesize":[{"value":"2.6 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"Diss_李　雨桐_RNK929_2019","objectType":"fulltext","url":"https://ir.kagoshima-u.ac.jp/record/14714/files/Diss_李　雨桐_RNK929_2019.pdf"},"version_id":"f7b81960-71de-413f-a354-3b62e820aeb1"},{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2019-06-18"}],"displaytype":"detail","filename":"Abstract_李 雨桐_3516730189_2019_日本語.pdf","filesize":[{"value":"177.7 kB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"Abstract_李 雨桐_3516730189_2019_日本語","objectType":"abstract","url":"https://ir.kagoshima-u.ac.jp/record/14714/files/Abstract_李 雨桐_3516730189_2019_日本語.pdf"},"version_id":"bf7c2d1e-601a-4efb-8b12-59d23aef19da"},{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2019-06-18"}],"displaytype":"detail","filename":"Abstract_李 雨桐_3516730189_2019_英語.pdf","filesize":[{"value":"57.3 kB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"Abstract_李 雨桐_3516730189_2019_英語","objectType":"abstract","url":"https://ir.kagoshima-u.ac.jp/record/14714/files/Abstract_李 雨桐_3516730189_2019_英語.pdf"},"version_id":"e0d2a224-bf2f-475a-afdf-ae99c54956b1"},{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2019-05-09"}],"displaytype":"detail","filename":"Result_Li_Yu_Tong_rnk_929_2019.pdf","filesize":[{"value":"1.5 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"Result_Li_Yu_Tong_rnk_929_2019","objectType":"other","url":"https://ir.kagoshima-u.ac.jp/record/14714/files/Result_Li_Yu_Tong_rnk_929_2019.pdf"},"version_id":"aa8724fe-78fe-4a09-8b5a-8e92aa8aa206"},{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2019-05-09"}],"displaytype":"detail","filename":"Comments_Li_Yu_Tong_rnk_929_2019.pdf","filesize":[{"value":"823.7 kB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"Comments_Li_Yu_Tong_rnk_929_2019","objectType":"other","url":"https://ir.kagoshima-u.ac.jp/record/14714/files/Comments_Li_Yu_Tong_rnk_929_2019.pdf"},"version_id":"9101a45a-e114-4afb-a20d-9fa92f905383"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"doctoral thesis","resourceuri":"http://purl.org/coar/resource_type/c_db06"}]},"item_title":"農業集落排水施設における流入動態と運転管理の適正化に関する研究","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"農業集落排水施設における流入動態と運転管理の適正化に関する研究","subitem_title_language":"ja"},{"subitem_title":"The Study on Influent Dynamic State and Optimization of Operation Management in Rural Wastewater Treatment Facilities","subitem_title_language":"en"},{"subitem_title":"ノウギョウ シュウラク ハイスイ シセツ ニオケル リュウニュウ ドウタイ ト ウンテン カンリ ノ テキセイカ ニ カンスル ケンキュウ","subitem_title_language":"ja-Kana"}]},"item_type_id":"5","owner":"18","path":["72"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2019-05-09"},"publish_date":"2019-05-09","publish_status":"0","recid":"14714","relation_version_is_last":true,"title":["農業集落排水施設における流入動態と運転管理の適正化に関する研究"],"weko_creator_id":"18","weko_shared_id":-1},"updated":"2024-01-09T03:20:24.124206+00:00"}