海水淡化與微藻養殖系統水資源聯合運用之可行性研究

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Title:	海水淡化與微藻養殖系統水資源聯合運用之可行性研究 The Feasibility Study of Desalination and Water Resources in Cultivated Microalgae System Assessment
Authors:	孫瑋良
Contributors:	環境工程與科學系甘其銓
Keywords:	海水淡化微藻養殖系統逆滲透 Ultrafiltration Aquaculture Farming Reverse Osmosis Treatment
Date:	2013
Issue Date:	2014-03-11 14:47:24 (UTC+8)
Abstract:	UF超濾為為現階段最具發展潛的RO前處理方法之一，其可增加RO的使用壽命，降低膜的汰換率，並較傳統之預處理提供RO系統更穩定的水質。本研究評估海水淡化系統與微藻養殖系統之水資源聯合運用，除包括原本使用之海水淡化前處理UF過濾系統是否可以微藻養殖系統之前處理單元直接取代，亦即評估3µm薄膜生態池之出流水直接進入海水淡化系統之可行性及其對RO膜阻塞之影響；進一步評估微藻養殖廢水回收作為RO系統進流水之可行性及其對RO膜阻塞之影響。而恐微藻養殖廢水直接進入RO系統，可能導致藻類釋出之胞外聚合物(Extracellular Polymeric Substance，EPS)含量過高可能對薄膜造成嚴重阻塞，便進一步評估微藻養殖廢水參配3µm薄膜生態池產水作為RO飼水之可行性。3µm薄膜生態池產水試驗之RO膜平均通量為0.54 m3/m2-day，溫排水之平均通量為0.37 m3/m2-day，微藻養殖廢水試驗之平均通量為0.37 m3/m2-day，微藻養殖廢水參配3µm薄膜生態池產水試驗之平均通量為0.35 m3/m2-day，顯然以3µm薄膜生態池試驗之產水通量表現較佳，溫排水、微藻養殖廢水及微藻養殖廢水參配3µm薄膜生態池產水則差異性不大。本研究探討四種飼水試驗之RO膜阻塞物，溫排水以小於0.2µm溶解性有機物質為主，3µm薄膜生態池以大於1µm之較大顆粒性物質為主要，此大顆粒性物質阻塞於RO膜表面形成濾餅，將使濾餅在堆疊下呈現較大孔隙而讓此股飼水通量相較於三種飼水較大；微藻養殖廢水與微藻養殖廢水參配3µm薄膜生態池產水以小於0.2µm溶解性有機物，試驗雖飼水中含有大量第四類類微生物副產物有機物，但RO膜上阻塞之有機物物種，皆以第三類類磺酸與第五類類腐植酸為主，說明天然水體中溶解性之磺酸及腐植酸較易吸附至本研究所使用之RO膜；不同飼水試驗所得之RO膜表面無機物累積含量，溫排水及3µm薄膜生態池無機阻塞物以Ca、Mg為主。微藻養殖廢水及微藻養殖廢水參配3µm薄膜生態池之產水RO膜表面無機物含量，無機阻塞物差異不大，除Ca、Mg外，B亦為主要無機阻塞物。關鍵字:海水淡化、微藻養殖系統、逆滲透 Ultrafiltration (UF) is considered as one of the most promising development in the reverse osmosis (RO) pre-treatment methods. Some advantages of UF is that it can extend the usage of the RO, reduce membrane replacement, and can provide more stable water quality compared with the traditional RO pretreatment systems. This study evaluated and assessed the combined microalgae culture and desalination systems for water resources including the original use of desalination pretreatment in the UF filtration system. The microalgae culture system was installed before the processing unit which is measured by 3μm films located in the effluent of the ecological pond to confirm the feasibility of desalination systems and its impact on the RO membrane treatment system. Further assessment of the microalgae aquaculture wastewater recycling system was made because the wastewater was released directly into the RO system and may result in the production of algal extracellular polymer substance (EPS) which may cause serious damage in the film if the concentration is too high. The assessment of the microalgae aquaculture wastewater in the ecological pond was also done by using 3μm film.Results showed that the RO membrane produced an average flux of 0.54 m3/m2-day, the average thermal discharge and wastewater average flux was both 0.37 m3/m2-day in the ecological pond. Microalgae aquaculture wastewater with 3μm film produced an average flux of 0.35 m3/m2-day, the slight difference in the value can be attributed to the difference in temperature, drainage, microalgae culture and microalgae aquaculture wastewater. In this study four kinds of RO membrane feed water component was tested, thermal discharge to less than 0.2μm dissolved organic matter dominated, 3μm film ecological pond to the larger particles more than 1μm as the main material. This large particulate matter form a filter cake in the RO membrane surface, the cake is located under the stack with larger pores and this stock in the water feed produced flux of which the value is higher than the three kinds of feed. Microalgae and microalgae aqualculture farming wastewater in the ecological pond effluent with 3μm film resulted to less than 0.2μm dissolved organic matter, the feed water contains a lot of microbial byproducts which falls under Class IV water quality, but the RO membrane was composed of organic species that belongs to the third and the fifth class sulfonic acid and humic acid-based. Natural water soluble in acid and humic acid that are readily adsorbed to the RO membrane was used in this study with different water feed, RO membrane surface, accumulated inorganic content, temperature, ecological pond drainage and 3μm film inorganic components in Calcium (Ca) and Magnesium (Mg) based. Microalgae and microalgae aquaculture farming wastewater in the ecological pond effluent was studied using 3μm film located in the RO membrane surface with mineral content and minimum inorganic component composed Ca, Mg and Boron (B).Key word：Ultrafiltration、Reverse Osmosis Treatment、Desalination、Aquaculture Farming.
Relation:	電子全文公開日期：不公開，學年度：101，60頁
Appears in Collections:	[Dept. of Environmental Engineering and Science (including master's program)] Dissertations and Theses

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