The occurrence of enhanced biological phosphorus removal in a 200,000 m3/day partial nitration and Anammox activated sludge process at the Changi water reclamation plant, Singapore

Yeshi Cao, Bee Hong Kwok, Mark C.M. Van Loosdrecht, Glen T. Daigger, Hui Yi Png, Wah Yuen Long, Chua Seng Chye, Yahya A.B.D. Ghani

Research output: Contribution to journalArticleScientificpeer-review

12 Citations (Scopus)

Abstract

Mainstream partial nitritation and Anammox (PN/A) has been observed and studied in the step-feed activated sludge process at the Changi water reclamation plant (WRP), which is the largest WRP (800,000 m3/d) in Singapore. This paper presents the study results for enhanced biological phosphorus removal (EBPR) co-existing with PN/A in the activated sludge process. Both the in-situ EBPR efficiency and ex-situ activities of phosphorus release and uptake were high. The phosphorus accumulating organisms were dominant, with little presence of glycogen accumulating organisms in the activated sludge. Chemical oxygen demand (COD) mass balance illustrated that the carbon usage for EBPR was the same as that for heterotrophic denitrification, owing to autotrophic PN/A conversions. This much lower carbon demand for nitrogen removal, compared to conventional biological nitrogen removal, made effective EBPR possible. This paper demonstrated for the first time the effective EBPR co-existence with PN/A in the mainstream in a large full-scale activated sludge process, and the feasibility to accommodate EBPR into the mainstream PN/A process. It also shows EBPR can work under warm climates.

Original languageEnglish
Pages (from-to)741-751
Number of pages11
JournalWater Science and Technology
Volume75
Issue number3
DOIs
Publication statusPublished - 2017

Keywords

  • Biological nutrient removal
  • Changi WRP
  • COD
  • Deammonification
  • Enhanced biological phosphorus removal
  • Mainstream partial nitritation and Anammox
  • Tropical

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