Publication: Phosphorus Recovery and Bioavailability from Chemical Extraction of Municipal Wastewater Treatment’s Waste Activated Sludge: A Case of Bangkok Metropolis, Thailand
1
Issued Date
2022
Resource Type
Language
eng
File Type
application/pdf
No. of Pages/File Size
10 Page
Journal Title
Environment and Natural Resources Journal
Volume
20
Issue
4
Start Page
369
End Page
378
Access Rights
open access
Rights
ผลงานนี้เป็นลิขสิทธิ์ของมหาวิทยาลัยมหิดล ขอสงวนไว้สำหรับเพื่อการศึกษาเท่านั้น ต้องอ้างอิงแหล่งที่มา ห้ามดัดแปลงเนื้อหา และห้ามนำไปใช้เพื่อการค้า
Rights Holder(s)
Faculty of Environment and Resource Studies Mahidol University.
Bibliographic Citation
Environment and Natural Resources Journal. Vol. 20, No. 4 (Jul - Aug 2022), 369-378
Suggested Citation
Kay Thi Khaing, Chongchin Polprasert, Suwisa Mahasandana, Wanida Pimpeach, Withida Patthanaissaranukool, Supawadee Polprasert Phosphorus Recovery and Bioavailability from Chemical Extraction of Municipal Wastewater Treatment’s Waste Activated Sludge: A Case of Bangkok Metropolis, Thailand. Environment and Natural Resources Journal. Vol. 20, No. 4 (Jul - Aug 2022), 369-378. 378. Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/114030
Research Projects
Organizational Units
Authors
Journal Issue
EnNRJ Vol. 20 No. 4
(2022)
Thesis
Title
Phosphorus Recovery and Bioavailability from Chemical Extraction of Municipal Wastewater Treatment’s Waste Activated Sludge: A Case of Bangkok Metropolis, Thailand
Abstract
This study evaluated the extractability and bioavailability of Phosphorus (P) recovered from waste activated sludge (WAS) so as to reduce dependence on the import of non-renewable P resources. P extraction was carried out using sulfuric acid (H2SO4). A response surface methodology was used to optimize conditions for the chemical leaching of WAS. The results showed the optimum condition for leaching WAS with 0.1 mol/L H2SO4 for 30 min, resulting in 97% P released. The efficiency of P recovery by P precipitation was associated with pH value and Mg:P. At pH 7, 9, and 11, P recovery was 92, 92, and 91% with uncontrolled Mg and 93, 93, and 92% with sea salt (Mg:P, 2:1), respectively. However, the yield of the produced struvite was much lower compared with that of added sea salt. From elemental analysis, the yield of struvite precipitated at pH 9 of Mg:P, 2:1 was about 26%, and the total P content of the precipitate was 12%. Available P was almost 80% after 35 days of operation, which was higher than that of commercial fertilizers. Results of this study are expected to provide fully comprehensive information to decision-makers regarding the suitability of implementing P-composite matter recovered from WAS. This will also help close the loop of the P cycle for food cultivation in the human ecosystem.