TAILIEUCHUNG - Assess the denitrification potential of fermented biosolids based on their specific denitrification rate (SDNR)

The study examined the potential of fermented and dark-fermented biosolids as external carbon sources for denitrification improvement. This was done by up-scaling the selected two (out of seven) sludge fermentation conditions from past studies, carrying out ammonia stripping pre-treatment to fix the C/N ratio, before finding their specific denitrification rate (SDNR) using SDNR experiment set-up. | Journal of Science and Technology 54 (2A) (2016) 112-119 ASSESS THE DENITRIFICATION POTENTIAL OF FERMENTED BIOSOLIDS BASED ON THEIR SPECIFIC DENITRIFICATION RATE (SDNR) Phung Anh Duc1, *, Phung Chi Sy2 1 Royal Melbourne Institute of Technology, 124 La Trobe Street, Melbourne, Victoria, Australia 2 Environmental Technology Center (ENTEC), 439A9 Phan Van Tri Street, Ward 5, Go Vap District, Ho Chi Minh City, Vietnam * Email: anhducphung1988@ Received: 1 April 2016; Accepted for publication: 15 June 2016 ABSTRACT The study examined the potential of fermented and dark-fermented biosolids as external carbon sources for denitrification improvement. This was done by up-scaling the selected two (out of seven) sludge fermentation conditions from past studies, carrying out ammonia stripping pre-treatment to fix the C/N ratio, before finding their specific denitrification rate (SDNR) using SDNR experiment set-up. The gotten SDNR were then compared to the SDNR of other substances gotten from both previous studies and literature, to weight the denitrification potential of fermented biosolids as a substance. The results found that with an initial COD of 607-704 mgCOD/L, the SDNR of the two fermented biosolids and dark fermented biosolids were found to be ± and ± respectively. This was much higher than the for sucrose and ± for wastewater found in earlier study using the same methodology; and comparable to the denitrification potential value for the well-studied methanol Keywords: fermented sludge, dark fermentation, denitrification potential, SDNR. 1. INTRODUCTION The lack of organic carbon available for denitrification in anoxic zones of municipal wastewater treatment plants (WWTP) have always been one of the biggest issue within the industry. As organic carbon often was the limiting substrates that prevent complete denitrification to be achieved, subsequently resulted in high concentration of nitrates in posttreatment .

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