title: Improved volatile fatty acids production from proteins of sewage sludge with anthraquinone-2,6-disulfonate (AQDS) under anaerobic condition.
abstract: Organic matters in sewage sludge can be converted into volatile fatty acids (VFAs) as renewable carbon sources. This work for the first time applied anthraquinone-2,6-disulfonate (AQDS) for enhancing VFA production from sewage sludge. With 0.066 or 0.33 g AQDS g(-1) dried solids (DS), the yields for VFAs peak at 403 or 563 mg l(-1), 1.9- or 2.7-fold to the control. The accumulated VFAs were principally composed of acetate and propionate. The AQDS enhances degradation rates of model proteins (bovine serum albumin), but had little enhancement on that of model polysaccharides (dextrans). The acidification step is proposed the rate-limiting step for VFA production from sewage sludge, in which the AQDS molecules shuttle electrons to accelerate the redox reactions associated with amino acid degradation. Methanogenic activities are inhibited in the presence of AQDS. The AQDS-assisted VFAs are renewable organic carbon sources, although their direct use for anaerobic digestion is not advised.
authors: State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
authors: Xue
authors: X
authors: Yang
authors: Maoan
authors: M
authors: Du
authors: Duu-Jong
authors: DJ
authors: Lee
authors: Chunli
authors: C
authors: Wan
authors: Lina
authors: L
authors: Zheng
authors: Fang
authors: F
authors: Wan
mesh_terms: D000143:Acids; D000641:Ammonia / Q000032:analysis; D000693:Anaerobiosis / Q000187:drug effects; D000818:Animals; D000880:Anthraquinones / Q000494:pharmacology*; D001673:Biodegradation, Environmental / Q000187:drug effects; D001709:Biotechnology / Q000379:methods*; D002417:Cattle; D005232:Fatty Acids, Volatile / Q000096:biosynthesis*; D005285:Fermentation / Q000187:drug effects; D006868:Hydrolysis / Q000187:drug effects; D008697:Methane / Q000378:metabolism; D009584:Nitrogen / Q000032:analysis; D011506:Proteins / Q000378:metabolism*; D012710:Serum Albumin, Bovine / Q000378:metabolism; D012722:Sewage / Q000737:chemistry*; D013997:Time Factors
chemical_list: D000143:Acids; D000880:Anthraquinones; D005232:Fatty Acids, Volatile; D011506:Proteins; D012722:Sewage; C408124:anthraquinone-2,6-disulfonate; D012710:Serum Albumin, Bovine; D000641:Ammonia; D009584:Nitrogen; D008697:Methane