Effect of raw water quality on formation of nitrification in water distribution pipes - Details

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Abstract：

Effect　of　raw　water　quality　on　nitrification　formation　and　its　influence　on　effluent　in　water　distribution　pipes　were　studied　by　pipeline　reactors　simulated　the　water　situation.　Water　samples　were　prepared　in　laboratory　to　simulate　Class　II,　Class　III　and　Class　V　of　the　surface　water　standard.　The　results　showed　that　the　concentration　of　ammonia　nitrogen　(NH4+-N)　and　dissolved　oxygen　(DO)　in　raw　water　had　significant　effect　on　NH4+-N　removal.　Under　sufficient　DO,　removal　rate　of　NH4+-N　improved　with　the　increasing　NH4+-N　concentration　in　raw　water.　When　DO　was　insufficient,　NH4+-N　removal　was　limited　by　DO.　Accumulation　of　nitrite　nitrogen　(NO2--N)　was　significantly　affected　by　concentration　of　NH4+-N　in　raw　water　at　initial　stage　of　biofilm　formation.　NO2--N　accumulated　more　serious　with　higher　NH4+-N　content,　but　the　influence　gradually　weakened　as　the　biofilm　matured.　The　quantity　of　AOB　was　considerably　affected　by　concentration　of　NH4+-N　in　raw　water,　and　AOB　quantity　increased　with　the　concentration　of　NH4+-N.　The　quantity　of　NOB　was　considerably　affected　by　the　concentration　of　both　NH4+-N　and　DO　in　raw　water.　Low　DO　concentration　would　inhibit　activity　of　NOB,　resulted　in　fewer　quantity　of　NOB　and　less　accumulation　of　NO2--N.　Nitrification　in　water　distribution　pipes　was　generated　by　nitrifying　bacteria　in　the　bulk　water　and　biofilm,　but　biofilm　nitrify　bacteria　had　a　higher　level　than　bulk　nitrify　bacteria.

Keyword：

Effluents Biochemical oxygen demand Nitrogen Water quality Water supply systems Surface waters Ammonia Dissolved oxygen Nitrogen removal Biofilms Bacteria Nitrogen oxides Nitrification

Author Community：

[ 1 ] [Zhang, Da]Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China
[ 2 ] [Yang, Yan-Ling]Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China
[ 3 ] [Li, Xing]Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China
[ 4 ] [Xiang, Kun]Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China
[ 5 ] [Liu, Yang-Yang]Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China
[ 6 ] [Xu, Mei-Ling]Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China
[ 7 ] [Huang, Liu]Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China
[ 8 ] [Chen, Nan]Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China