Microalgae applied to livestock wastewater treatment
微藻應用於畜牧廢水處理
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          According to the EPA's survey of land-based water pollution sources in Taiwan, livestock wastewater accounts for nearly 10% of all types of wastewater. Among them, piggery wastewater is the main source of pollution. If 30 liters per pig per day is produced, the amount of piggery wastewater produced in Taiwan is as high as 200,000 metric tons per day. At present, most of the wastewater treatment facilities used by domestic livestock farmers apply the three-stage wastewater treatment method developed and promoted by the Animal Production Research Institute of the Agriculture Committee. However, the wastewater currently discharged still contains high concentrations of nitrogen, phosphorus and mineral salts, causing serious environmental impact. In 2018, the Agriculture and Fisheries Commission promoted the direct land application of piggery wastewater for agricultural use. Studies have shown that direct discharge of piggery wastewater can alter the soil characteristics increasing the salinity, leaving the land in unusable conditions. Since carbon, nitrogen and phosphorus are the three most important elements for microalgal growth, piggery wastewater rich in these nutrients is very suitable as a sustainable nutrient source for microalgal cultivation. After laboratory tests, it has been shown that microalgae can not only effectively remove COD, nitrogen and phosphorus from piggery wastewater, but also produce liquid microalgal biomass for direct agricultural land irrigation without soil acidification. The microalgal biomass can be further fermented with special strains to produce liquid fertilizer with high economic value. Therefore, the use of microalgae to treat livestock wastewater can effectively purify wastewater and produce liquid microalgal biomass with high economic value, which is a promising technology with great development potential. The technology was interviewed by Discovery Channel in 2017 and premiered in public media on 2017.11.18. In 2018, it won the LEKO Technical Award from the TECO Green Tech International Contest. In 2017, our term signed a total of US$70,000 in international technology transfer with Asia Nutrition Technologies Co., Ltd. in Vietnam, and implemented 3 international industrial-university cooperation projects at the same time. In 2018, once again, our term signed a technology transfer with total worth of NT$10 million to Nanoplus Ltd.

          根據環保署所做之台灣地區陸域水體污染來源調查顯示,畜牧廢水佔各類廢水總污染量將近十分之一,其中更以豬糞廢水為畜牧廢水主要的污染來源,若以每日每頭猪30公升之廢水量來計算,台灣每日所產生的猪糞尿廢水量高達20萬公噸。目前國內大多數畜牧業者所採用的廢水處理設施,大多數採用農委會畜產試驗所所研發、推廣之三段式廢水處理設施,但是目前所排放的廢水仍然含有高濃度的氮、磷以及含鹽物質,導致造成嚴重的環境衝擊,2018年農委會大力推廣的豬糞尿廢水直接澆灌農地的政策,但已有業者證實豬糞尿廢水直接澆灌,會造成土地氮、磷以及含鹽物質大幅提高,導致無法耕種,因此豬糞尿廢水應用於農地之實際澆灌量非常少。由於碳氮磷是藻類行光合作用最重要的3大元素,豬糞尿廢水剛好含有豐富的碳氮磷,非常適合作為藻類的營養來源,經過實驗室的初步測試,小球藻不僅能有效去除豬糞尿廢水的COD以及氮磷,所產生的藻液更可直接進行農地澆灌而不會有土壤酸化的問題,藻液更可進一步與特殊菌種共發酵以生產高經濟價值的液態肥料。因此,利用微藻發展畜牧廢水處理系統可有效淨化廢水並生產具有高經濟價值的藻體,是極具發展潛力的前瞻技術。該技術於2017年榮獲Discovery Channel採訪,並於2017.11.18於公眾媒體首播;並於2018年獲得東元「Green Tech」國際創意競賽「LEKO低碳技術獎」;於2017年與越南Asia Nutrition Technologies Co., Ltd.簽訂國際技轉共70,000美金,並同時執行3件國際合作計畫;2018年更完成與英屬開曼群島商納諾股份有限公司台灣分公司之技轉案,劑轉金額為1,000萬新台幣。