Surging oil, feed and fertilizer costs have impacted farmers particularly hard. Farm-based, local
sources of renewable energy could help reduce energy costs for farmers and help develop ruralbased
processing and manufacturing of biofuel to bolster rural economies. At the same time, nutrient
contamination and eutrophication from farming operations have become national problems.
Algal-based bioprocessors have the potential to address these problems simultaneously. At Appalachian
State University (Appstate) we set out to design, build and test a system that uses algae to
capture wastewater nutrients as well as excreted pharmaceuticals, while simultaneously sequestering
CO2, producing oil for conversion to biodiesel and feed for livestock. There are a number of
problems with current algae growth systems. Algae grown in an open pond or raceway system are
suspended in the water in the presence of soluble and suspended waste making most of the current
harvest techniques problematic and expensive. Appstate designed algae troughs in which the
algae are immobilized on a solid substrate. The laboratory-scale prototype was constructed of
three-sided square plastic pipe open at the top. Inside the pipe, there was a series of cloth filters
supported by rigid flow-through baffles. Preliminary results observed an average percent reduction
of nitrate and phosphorous of 40 and 43, respectively, from different initial nutrient concentrations.
Near complete removal (~96%) of estrogen was observed in 2-day trial experiments. In
addition, effective increases in algal biomass which can serve as both biofuel feedstock and livestock
feed were observed.
Surging oil, feed and fertilizer costs have impacted farmers particularly hard. Farm-based, localsources of renewable energy could help reduce energy costs for farmers and help develop ruralbasedprocessing and manufacturing of biofuel to bolster rural economies. At the same time, nutrientcontamination and eutrophication from farming operations have become national problems.Algal-based bioprocessors have the potential to address these problems simultaneously. At AppalachianState University (Appstate) we set out to design, build and test a system that uses algae tocapture wastewater nutrients as well as excreted pharmaceuticals, while simultaneously sequesteringCO2, producing oil for conversion to biodiesel and feed for livestock. There are a number ofproblems with current algae growth systems. Algae grown in an open pond or raceway system aresuspended in the water in the presence of soluble and suspended waste making most of the currentharvest techniques problematic and expensive. Appstate designed algae troughs in which thealgae are immobilized on a solid substrate. The laboratory-scale prototype was constructed ofthree-sided square plastic pipe open at the top. Inside the pipe, there was a series of cloth filterssupported by rigid flow-through baffles. Preliminary results observed an average percent reductionof nitrate and phosphorous of 40 and 43, respectively, from different initial nutrient concentrations.ใกล้เสร็จสมบูรณ์เอา (~ 96% ฮอร์โมนหญิงถูกสังเกตในการทดลองทดลองใช้ 2 วัน ในนอกจากนี้ มีประสิทธิภาพเพิ่มชีวมวล algal ซึ่งสามารถใช้เป็นวัตถุดิบเชื้อเพลิงชีวภาพและปศุสัตว์ตัวดึงข้อมูลถูกตรวจสอบ
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