แหล่งของคาร์บอนในรูปกรดอะซิติกจากการหมักตะกอนส่วนเกินของระบบก๊าซชีวภาพในการกำจัดสารอาหารในระบบกำจัดฟอสฟอรัสทางชีวภาพแบบเพิ่มพูน
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ธ.ค. 22, 2021
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กรดแอซีติก ซีโอดี ตะกอนส่วนเกิน ไนโตรเจน ฟอสฟอรัส สมดุลมวล
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บทคัดย่อ
สารอินทรีย์คาร์บอน ไนโตรเจน และฟอสฟอรัสในน้ำเสียเป็นปัญหามลพิษทางน้ำที่สำคัญ ซึ่งการควบคุมระบบกำจัดฟอสฟอรัสทางชีวภาพแบบเพิ่มพูนจำเป็นต้องมีการเติมแหล่งคาร์บอนจากภายนอก และสารเคมีที่เป็นด่าง ทำให้เสียค่าใช้จ่ายในการซื้อสารเคมีเพิ่มขึ้น ดังนั้นงานวิจัยนี้จึงมุ่งศึกษาถึงการกำจัดฟอสฟอรัส ไนโตรเจน และซีโอดีในระบบกำจัดฟอสฟอรัสทางชีวภาพของระบบบำบัดน้ำเสียชุมชน โดยทดลองเติมกรดแอซีติกที่ได้จากการหมักตะกอนส่วนเกินของระบบผลิตก๊าซชีวภาพ และควบคุมความเป็นด่างจากการเติมมูลสุกร และโซเดียมไบคาร์บอเนตที่สัดส่วนเท่ากับ 2 : 1 กำหนดให้ค่าฟอสฟอรัสเท่ากับ 25 มก./ล. ไนโตรเจนในรูปของทีเคเอนเท่ากับ 15 มก./ล. และซีโอดี (กรดแอซีติกที่ได้จากการหมักตะกอนส่วนเกินแบบไร้ออกซิเจน) เท่ากับ 380 มก./ล. อายุตะกอนเท่ากับ 60 วัน ผลการทดลองเมื่อใช้แหล่งคาร์บอนจากการหมักตะกอนส่วนเกินแบบไร้ออกซิเจนพบว่า เมื่อเดินระบบจนเข้าสู่สภาวะคงที่ (91 วัน) การกำจัดฟอสฟอรัส ไนโตรเจน และสารอินทรีย์คาร์บอนมีแนวโน้มเพิ่มสูงขึ้น (ร้อยละ 6.92, 20.72 และ 0.74) เมื่อเทียบกับระบบที่ใช้มูลสุกรอย่างเดียวในการควบคุมความเป็นด่าง ซึ่งจากการทำสมดุลมวลพบว่า มีปริมาณของฟอสฟอรัสที่สะสมในเซลล์จุลินทรีย์ร้อยละ 52.32 แสดงว่าปริมาณกรดแอซีติกจากการหมักตะกอนส่วนเกินของระบบผลิตก๊าซชีวภาพสามารถใช้ทดแทนกรดแอซีติกจากสารเคมี ซึ่งสามารถนำมาใช้เป็นแนวทางในการควบคุมระบบบำบัดน้ำเสียชุมชน และช่วยลดต้นทุนการเดินระบบได้
Article Details
บท
บทความวิจัย ด้านวิศวกรรมศาสตร์
บทความที่ลงตีพิมพ์เป็นข้อคิดเห็นของผู้เขียนเท่านั้น
ผู้เขียนจะต้องเป็นผู้รับผิดชอบต่อผลทางกฎหมายใดๆ ที่อาจเกิดขึ้นจากบทความนั้น
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[30] A. A. H. Azzouz, N. A. Naas, and K. M. Darwish, “Physicochemical characterization of the sewage sludge from guarchia wastewater treatment plant in benghazi-libya evaluation of the organic composition,” MOJ Bioorganic & Organic Chemistry, vol. 1, no. 2, pp. 30–48, 2017.
[31] J. Schade, K. Macneill, S. Thomas, C. Mcneely, J. Welter, J. M. Hood, M. Goodrich, M. E. Power, and J. Finlay, “The stoichiometry of nitrogen and phosphorus spiraling in heterotrophic and autotrophic streams,” Freshwater Biology, vol. 56, no. 3, pp. 424–436, 2010.
[32] H. Hauduc, T. Wadhawan, B. Johnson, C. Bott, M. Ward, and I. Takács, “Incorporating sulfur reactions and interactions with iron and phosphorus into a general plant-wide model,” Water Science and Technology, vol. 79, no. 1, pp. 26–34, 2019.
[33] V. Eleni, M. Paraschos, and A. Alexander, “Sulfide removal in wastewater from petrochemical industries by autotrophic denitrification,” Water Research, vol. 39, pp. 4101–4109, 2005.
[34] P. Racho, “Investigation of downflow hanging sponge (DHS) system using bacterial and fungal cultures as a post treatment for the UASB effluent of a tapioca starch wastewater,” Ph.D. dissertation, Department of Environmental Engineering, Suranaree University of Technology, Nakhon Ratchasima, 2009 (in Thai).
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[36] Z. Yuan, A. Oehmen, and P. Ingildsen, “Control of nitrate recirculation flow in predenitrification systems,” Water science and technology, vol. 45, no. 4–5, pp. 29–36, 2002.
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