High rate algal pond for greywater treatment in arid and semi-arid areas

• Material Type: 博士論文
• Title: High rate algal pond for greywater treatment in arid and semi-arid areas
• Author/Editor: DERABE-MAOBE, HINA
• Author Heading: DERABE-MAOBE, HINA
• Publication, Distribution, etc.: Hokkaido University
• Publication Date: 2014-09-25
• Publication Date (W3CDTF): 2014-09-25
• Alternative Title: 乾燥地域及び半乾燥地域における高速藻類池の研究
• Contributor: 高橋, 正宏; 船水, 尚行; 岡部, 聡; 佐藤, 久
• Degree grantor/type: 北海道大学
• Date Granted: 2014-09-25
• Date Granted (W3CDTF): 2014-09-25
• Dissertation Number: 甲第11576号
• Degree Type: 博士(工学)
• Conferring No. (Dissertation): 甲第11576号
• Text Language Code: eng
• NDC: 500
• Target Audience: 一般
• Note (General): In recent years, large scale algal production has received lot of consideration due to the ability of algae to grow extremely rapidly and to accumulate a high quantity of lipid in their cells for biofuel production. For this purpose, algal photosynthetic growth is required and finding an economical and reliable method to produce and harvest algae feedstock remains a challenge. Thereby, apart from closed reactors used for algal production, the use of open ponds also known as high rate algal ponds which integrate wastewater treatment is nowadays emerging. For large scale biofuel production, HRAPs treating wastewater are recognized to be low cost than closed photobioreactors due to the easy operation and cost-effective construction.While the concern of algal biofuel production and wastewater treatment is currently increasing, this thesis focuses on the ability of HRAP to treat greywater and produce resources for agricultural activities in urban and peri-urban areas of arid and semi-arid countries. To tackle the increasingly severe issues related to water scarcity and domestic wastewater treatment in these areas, a greywater treatment system based on high rate algal pond (HRAP) was developed. As the conventional ponds, this technology is low cost, simple to build and operate. The HRAP is able to provide efficient wastewater treatment because of the assimilation of the wastewater nutrients into the algal biomass. Resources like biomass and energy can be recovered from the wastewater treatment for beneficial use. However, some negative points regarding the implementation of HRAP concern the large land area requirements and the washout of algae from ponds which increases the total suspended solids (TSS) concentration in the effluent. For an efficient wastewater treatment and recovery of resources usable in agriculture, the main purpose of this work consists to find operating strategies of HRAP leading to effective production and harvest of high settleable algal biomass.At a laboratory scale and under tropical conditions, several reactors simulating HRAP were set and various operated parameters based on the hydraulic retention time (HRT), solid retention time (SRT) and algal recycling were applied. In both reactors, the temperature was kept at 30±2 °C, the mixing of the reactor was performed to avoid algae sedimentation and LED lamps gave photosynthetic photon density varying from 430-550μmol-2s-1 at the surfaceiiiof the pond. The water qualities of synthetic greywater with their average values ±SD were: pH (6.76±0.45); T-N (12.41±3 mg/L); T-P (5.26±0.4 mg/L); TOC (22.69 mg/L). Samples withdrawn from influent tanks, HRAP, SBRs, CFRs and corresponding effluents tanks were collected once to twice per week and immediately analyzed. Total suspended solids (TSS) together with settleable solids were determined. Nitrogen and phosphorus species such as ammonium- nitrogen, nitrite, nitrate, total nitrogen, soluble reactive phosphorus and total phosphorus (T-P) were measured. As the treated effluent will serve for irrigation purpose, inactivation of E.coli in the system was also investigated.; (主査) 教授 高橋 正宏, 教授 船水 尚行, 教授 岡部 聡, 准教授 佐藤 久; 工学院（環境創生工学専攻）
• DOI: 10.14943/doctoral.k11576; https://doi.org/10.14943/doctoral.k11576
• Persistent ID (NDL): info:ndljp/pid/8952469; https://dl.ndl.go.jp/pid/8952469
• Collection: 障害者向け資料
• Collection (Materials For Handicapped People:1): テキストデータ
• Collection (particular): 国立国会図書館デジタルコレクション > デジタル化資料 > 博士論文; https://dl.ndl.go.jp/collections/A00014
• Acquisition Basis: 博士論文（自動収集）
• Available (W3CDTF): 2015-03-03
• Date Accepted (W3CDTF): 2015-02-03T05:25:05+09:00
• Date Created (W3CDTF): 2014-09
• Format (IMT): PDF
• Access Restrictions: 国立国会図書館内限定公開
• Service for the Digitized Contents Transmission Service: 図書館・個人送信対象外
• Availability of remote photoduplication service: 可
• Periodical Title (URI): http://dx.doi.org/10.14943/doctoral.k11576; http://hdl.handle.net/2115/57228
• Is Referenced By (URI): http://hdl.handle.net/2115/57227
• Data Provider (Database): 国立国会図書館 : 国立国会図書館デジタルコレクション; https://dl.ndl.go.jp

• Summary, etc.: In recent years, large scale algal production has received lot of consideration due to the ability of algae to grow extremely rapidly and to accumulat...