Biological denitrification with methanol as external carbon source - Details

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Abstract：

Changes　in　functional　properties　of　biological　denitrification　in　the　long-term　use　of　methanol　were　explored,　with　addition　of　methanol　(ρ(TOC)/ρ(N)=1.60.2)　at　the　start　of　anoxic　phase　in　sequencing　batch　reactor　(SBR).　The　results　showed　that　stable　nitrate　reduction　rates　were　not　reached　until　37　days　of　methanol　addition,　and　specific　denitrification　rate　increased　from　0.378　mgNOx-N/(gVSSh)　to　2.406　mgNOx-N/(gVSSh).　Besides,　from　nitrogen　uptake　rate　(NUR)　tests　with　methanol　acclimation　sludge,　the　appropriate　range　of　ρ(TOC)/ρ(N)　ratios　for　complete　denitrification　was　1.10-2.68.　However,　the　temperature　coefficient　of　16C　to　20C　was　calculated　to　be　1.07,　which　indicated　that　temperature　decrease　exerted　a　great　inhibitory　effect　on　biological　denitrification.　For　economic　reason,　the　addition　of　methanol　should　be　adjusted　to　biological　microenvironment　and　ambient　environment.

Keyword：

Carbon Batch reactors Methanol Temperature Biological filter beds Denitrification

Author Community：

[ 1 ] [Wang, Shu-Ying]Key Laboratory for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China
[ 2 ] [Yin, Fang-Fang]Key Laboratory for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China
[ 3 ] [Yin, Fang-Fang]Shenzhen Longgang Water Group, Shenzhen 518115, China
[ 4 ] [Hou, Hong-Xun]Key Laboratory for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China
[ 5 ] [Xu, Chun-Sheng]Key Laboratory for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China
[ 6 ] [Peng, Yong-Zhen]Key Laboratory for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China
[ 7 ] [Wang, Wei]Key Laboratory for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China