A design of experiments to assess methane production from anaerobic co-digestion of sewage sludge with lipid rich waste

Redirection of sewage sludge in wastewater treatment plants (WWTP) from landfilling or incineration to biological treatment,for instance anaerobic digestion,has become a part of the current global environmental,economic and regulatory issues.A statistical approach,based on a design of experiments,was adopted in order to assess methane production from the anaerobic co-digestion of mixed sewage sludge (MS) with crude glycerol (cGly) and waste frying oil (WFO).The effect of three factors-MS concentration,co-substrate concentration,and fraction ofcGly (xcGly) in a mixture (w/w) of cGly and WFO-on biochemical methane potential (BMP) and the maximum initial methane production rate (kCH4) was assessed by a Central Composite Design Circumscribed.In the absence ofa co-substrate,MS digestion reached a BMP of(294 ± 6) L kg-1 (L of methane at standard temperate and pressure (STP) conditions per kg of VS of waste added) and a kCH4 of (64± 1) L kg-1 d-1 (L of methane at STP conditions per kg of VS of waste added and per day),with a biodegradability of (56 ± 1) %.After optimization,MS and co-substrate concentrations of 4.64 g L-1 and 8.77 g L-l,respectively,with xcGly of 0.8 were defined as the condition to simultaneously boost BMP (91%) and kCH4 (250 %).An WWTP would be able to save 36.2 k∈ in electricity per 1 000 m3 of sewage sludge produced,if the selected co-digestion conditions were applied,rather than digesting only the sludge.
Anaerobic co-digestion Sewage sludge Lipid rich waste Wastewater treatment plan,Design of Experiments
J.V.Oliveira T.Duarte J.C.Costa A.J.Cavaleiro M.A.Pereira M.M.Alves
Centre of Biological Engineering, University of Minho, Campus de Gualtar, 4710-057 Braga (Portugal
国际会议
The 15th IWA World Conference on Anaerobic Digestion( 第15届IWA世界厌氧大会)
北京
英文
451-454
2017-10-17(万方平台首次上网日期,不代表论文的发表时间)