Utilization of polyvinyl alcohol (PVA) with coal ASH to immobilize nitrifying bacteria for ammonia-nitrogen removal in shrimp culture wastewater recirculation system
1
Issued Date
2007
Copyright Date
2007
Resource Type
Language
eng
File Type
application/pdf
No. of Pages/File Size
xiv, 173 leaves : ill.
Access Rights
open access
Rights
ผลงานนี้เป็นลิขสิทธิ์ของมหาวิทยาลัยมหิดล ขอสงวนไว้สำหรับเพื่อการศึกษาเท่านั้น ต้องอ้างอิงแหล่งที่มา ห้ามดัดแปลงเนื้อหา และห้ามนำไปใช้เพื่อการค้า
Rights Holder(s)
Mahidol University
Bibliographic Citation
Thesis (M.Sc. (Environmental Technology))--Mahidol University, 2007
Suggested Citation
Wannasiri Charee Utilization of polyvinyl alcohol (PVA) with coal ASH to immobilize nitrifying bacteria for ammonia-nitrogen removal in shrimp culture wastewater recirculation system. Thesis (M.Sc. (Environmental Technology))--Mahidol University, 2007. Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/96959
Title
Utilization of polyvinyl alcohol (PVA) with coal ASH to immobilize nitrifying bacteria for ammonia-nitrogen removal in shrimp culture wastewater recirculation system
Alternative Title(s)
การใช้โพลิไวนิล แอลกอฮอล์ร่วมกับเถ้าถ่านหินในการตรึงแบคทีเรียไนตริไฟอิ้งเพื่อกำจัดแอมโมเนียไนโตรเจนในระบบหมุนเวียนน้ำเสียจากการเพาะเลี้ยงกุ้ง
Author(s)
Advisor(s)
Abstract
Immobilization of nitrifying bacteria using polyvinyl alcohol (PVA) and coal ash may be a effective methods to remove ammonia-nitrogen from recirculating aquacultural water. This could help improve water quality for shrimp culture and reduce capital and operating costs. The objective of this research was to investigate the effects of mixture ratio (%, PVA : coal ash) of 10.0%, 12.5%, and 15.0% (w/v) of pure PVA in combination with 3%, 5%, and 7% (w/v) of coal ash in gel beads, at hydraulic retention times (HRT) of 1, 2, and 4 hrs. A continuous nitrification bioreactor was fed with synthetic shrimp culture wastewater containing 2 mg/L ammonia-nitrogen for the determination of the removal efficiency under the optimum operating conditions of the mixture ratio and HRT. The results showed that the average NH3-N removal efficiencies were in the range of 76-96%. The average NH3-N removal efficiencies under different conditions were significantly different (p < 0.05). The NH3-N removal efficiencies were affected by the mixture ratios (%, PVA : coal ash) and hydraulic retention time (HRT). The average NH3-N removal efficiencies of the mixture ratio (%, PVA : coal ash): 10.0:3, 5, 7 were 87%, 94%, and 95% when operated at HRT 1, 2, and 4 hrs, respectively. But there were no significant differences related to the mixture ratio (%, PVA : coal ash) and HRT on chemical oxygen demand (COD) removal efficiencies (p < 0.05). The optimum operating conditions of the PVA-coal gel beads in synthetic shrimp culture wastewater was at the mixture ratio (%, PVA : coal ash) of 10.0:3, 5, 7 and HRT of 2 hrs., which yielded NH3-N and COD removal efficiencies of 93.64%, and 1.62%, respectively with an ammonia removal rate of 24.26 g/m3-day.The high removal efficiency and removal rate obtained in this research work indicates that coal ash could be mixed with PVA to immobilize nitrifier and the immobilized nitrifier technology has a high potential application for the removal of ammonia-nitrogen from recirculating aquaculture wastewater.
Description
Environmental Technology (Mahidol University 2007)
Degree Name
Master of Science
Degree Level
Master's degree
Degree Department
Faculty of Public Health
Degree Discipline
Environmental Technology
Degree Grantor(s)
Mahidol University