title: Improve biogas production from low-organic-content sludge through high-solids anaerobic co-digestion with food waste.
abstract: Anaerobic co-digestion of sewage sludge and food waste was tested at two different total solid (TS) concentrations. In the low-solids group with TS 4.8%, the biogas production increased linearly as the ratio of food waste in substrate increased from 0 to 100%, but no synergetic effect was found between the two substrates. Moreover, the additive food waste resulted in the accumulation of volatile fatty acids and decelerated biogas production. Thus, the blend ratio of food waste should be lower than 50%. While in the high-solids group with TS 14%, the weak alkaline environment with pH 7.5-8.5 avoided excessive acidification but high concentration of free ammonia was a potential risk. However, good synergetic effect was found between the two substrates because the added food waste improved mass transfer in sludge cake. Thus, 50% was recommended as the optimum ratio of food waste in substrate because of the best synergetic effect.
authors: Key Laboratory of Microorganism Application and Risk Control of Shenzhen, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China.
authors: Chuanyang
authors: C
authors: Liu
authors: Key Laboratory of Microorganism Application and Risk Control of Shenzhen, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China. Electronic address: lihuansz@qq.com.
authors: Huan
authors: H
authors: Li
authors: Key Laboratory of Microorganism Application and Risk Control of Shenzhen, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China.
authors: Yuyao
authors: Y
authors: Zhang
authors: Key Laboratory of Microorganism Application and Risk Control of Shenzhen, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China.
authors: Can
authors: C
authors: Liu
mesh_terms: D000693:Anaerobiosis; D056804:Biofuels; D019149:Bioreactors; D005502:Food; D012722:Sewage / Q000737:chemistry*; D014866:Waste Products
chemical_list: D056804:Biofuels; D012722:Sewage; D014866:Waste Products
keywords: Anaerobic digestion; Biogas; Food waste; Sewage sludge