title: Combined Effect of Free Nitrous Acid Pretreatment and Sodium Dodecylbenzene Sulfonate on Short-Chain Fatty Acid Production from Waste Activated Sludge.
abstract: Free nitrous acid (FNA) serving as a pretreatment is an effective approach to accelerate sludge disintegration. Also, sodium dodecylbenzene sulfonate (SDBS), a type of surfactants, has been determined at significant levels in sewage sludge, which thereby affects the characteristics of sludge. Both FNA pretreatment and sludge SDBS levels can affect short-chain fatty acid (SCFA) generation from sludge anaerobic fermentation. To date, however, the combined effect of FNA pretreatment and SDBS presence on SCFA production as well as the corresponding mechanisms have never been documented. This work therefore aims to provide such support. Experimental results showed that the combination of FNA and SDBS treatment not only improved SCFA accumulation but also shortened the fermentation time. The maximal SCFA accumulation of 334.5 mg chemical oxygen demand (COD)/g volatile suspended solids (VSS) was achieved at 1.54 mg FNA/L treatment and 0.02 g/g dry sludge, which was respectively 1.79-fold and 1.41-fold of that from FNA treatment and sludge containing SDBS alone. Mechanism investigations revealed that the combined FNA pretreatment and SDBS accelerated solubilization, hydrolysis, and acidification steps but inhibited the methanogenesis. All those observations were in agreement with SCFA enhancement.
authors: College of Environmental Science and Engineering, Hunan University, Changsha 410082, P.R. China.|Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, P.R. China.
authors: Jianwei
authors: J
authors: Zhao
authors: Advanced Water Management Centre, The University of Queensland, QLD 4072, Australia.
authors: Yiwen
authors: Y
authors: Liu
authors: Advanced Water Management Centre, The University of Queensland, QLD 4072, Australia.
authors: Bingjie
authors: B
authors: Ni
authors: Advanced Water Management Centre, The University of Queensland, QLD 4072, Australia.
authors: Qilin
authors: Q
authors: Wang
authors: College of Environmental Science and Engineering, Hunan University, Changsha 410082, P.R. China.|Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, P.R. China.|Advanced Water Management Centre, The University of Queensland, QLD 4072, Australia.
authors: Dongbo
authors: D
authors: Wang
authors: College of Environmental Science and Engineering, Hunan University, Changsha 410082, P.R. China.|Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, P.R. China.
authors: Qi
authors: Q
authors: Yang
authors: School of Environment and Municipal Engineering, Qingdao Technological University, Qingdao 266033, P.R. China.
authors: Yingjie
authors: Y
authors: Sun
authors: College of Environmental Science and Engineering, Hunan University, Changsha 410082, P.R. China.|Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, P.R. China.
authors: Guangming
authors: G
authors: Zeng
authors: College of Environmental Science and Engineering, Hunan University, Changsha 410082, P.R. China.|Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, P.R. China.
authors: Xiaoming
authors: X
authors: Li
mesh_terms: D001557:Benzenesulfonates / Q000032:analysis / Q000737:chemistry*; D003911:Dextrans / Q000737:chemistry; D005232:Fatty Acids, Volatile / Q000032:analysis / Q000737:chemistry*; D005285:Fermentation; D008697:Methane / Q000138:chemical synthesis; D009608:Nitrous Acid / Q000032:analysis / Q000737:chemistry*; D012709:Serum Albumin / Q000737:chemistry; D012722:Sewage / Q000032:analysis / Q000737:chemistry*
chemical_list: D001557:Benzenesulfonates; D003911:Dextrans; D005232:Fatty Acids, Volatile; D012709:Serum Albumin; D012722:Sewage; C001114:dodecylbenzenesulfonic acid; D008697:Methane; D009608:Nitrous Acid