Effect of sludge type on sludge alkaline fermentation - Details

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Abstract：

There　are　mainly　three　types　of　sludge　in　the　wastewater　treatment　plant,　i.e.,　waste　activated　sludge　(WAS),　primary　sludge　(PS)　and　mixed　sludge　(MS),　for　which　their　composition　is　different,　leading　to　different　products　of　fermentation.　So,　in　this　paper　their　anaerobic　fermentation　characteristics　was　investigated　under　the　condition　of　35°C,　pH=10　and　the　same　concentration　of　VSS　(volatile　suspend　solids).　The　results　showed　that　there　was　a　sludge　order　for　both　the　soluble　chemical　oxygen　demand　(SCOD)　and　total　volatile　fatty　acids　(TVFA)produced:　WAS＞MS＞PS.　The　optimal　fermentation　time　for　all　type　of　sludge　was　8　d,　and　producing　TVFA　529,　359,　162　mg　COD·(g　VSS)-1　respectively　for　WAS,　MS　and　PS.　For　any　type　of　sludge,　acetic　acid　is　the　dominant　fermentation　product　in　the　six　short　chain　volatile　fatty　acids.　The　hydrolysis　and　acidification　of　sludge　were　enhanced　when　mixing　waste　activated　with　primary　sludge.　The　ammonia　and　phosphorus　released　by　fermentation　were　WAS＞MS＞PS,　MS＞WAS＞PS.　©　All　Rights　Reserved.

Keyword：

Activated sludge process Chemical oxygen demand Volatile fatty acids Fermentation Ammonia Hydrolysis Wastewater treatment Acidification Alkalinity

Author Community：

[ 1 ] [Su, Gaoqiang]Key Laboratory of Beijing for Water Quality Science and Water Environmental Recovery Engineering, Beijing University of Technology, Beijing 100124, China
[ 2 ] [Peng, Yongzhen]Key Laboratory of Beijing for Water Quality Science and Water Environmental Recovery Engineering, Beijing University of Technology, Beijing 100124, China
[ 3 ] [Wang, Chuanxin]Key Laboratory of Beijing for Water Quality Science and Water Environmental Recovery Engineering, Beijing University of Technology, Beijing 100124, China
[ 4 ] [Gao, Yongqing]Key Laboratory of Beijing for Water Quality Science and Water Environmental Recovery Engineering, Beijing University of Technology, Beijing 100124, China
[ 5 ] [Huo, Mingxin]School of Urban and Environmental Sciences, Northeast Normal University, Changchun 130024, Jilin, China
[ 6 ] [Zhu, Suiyi]School of Urban and Environmental Sciences, Northeast Normal University, Changchun 130024, Jilin, China