Yuan Hong-Lin, Ma Jing, Xing Bao-Shan, Wen Jun-Wei, Han Yu-le, Li Qian, Wang Xiao-Chang
Key Laboratory of Northwest Water Resource, Environment and Ecology, Ministry of Education, International Science & Technology Cooperation Center for Urban Alternative Water Resources Development, Engineering Technology Research Center for Wastewater Treatment and Reuse, Shaanxi Province, Key Laboratary of Environmental Engineering, Shaanxi Province, School of Environmental & Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.
Huan Jing Ke Xue. 2019 Feb 8;40(2):994-1002. doi: 10.13227/j.hjkx.201808114.
Two parallel digestion systems of food waste (FW) and waste-activated sludge (WAS) were successfully initiated using a continuous stirred-tank reactor (CSTR), and the effect of different reduction extents of sludge retention time (SRT) on the co-digestion of FW and WAS was investigated. SRT Reduction extents longer than 8.3 d were not conducive to the stable operation of the co-digestion system when the organic load rate (OLR) was increased. The reduction extent of SRT should be reduced gradually from 5 d to 0.9 d to achieve high load and stable operation of the co-digestion of FW and WAS. After a long-term operation (approximately 282 d), the co-digestion reached stable operation at SRT of 9.1 d and OLR (calculated by COD) of (12.9±1.5) g·(L·d). The corresponding methane production, methane yield (calculated by COD), pH, and volatile fatty acid (VFA, calculated by COD) were 3.94-4.25 L·(L·d), 288-302 mL·g, 7.80-7.83, and 0.32-0.39 g·L, respectively. Additionly, the sludge characteristics of the co-digestion of FW and WAS under a high loading rate were also investigated. The results showed that the primary pathway of methane conversion was through acetic acid during the co-digestion of FW and WAS. Meanwhile, higher methanogenic activity of acetic acid, propionic acid, butyric acid, valeric acid, and coenzyme F concentration were also measured.
利用连续搅拌槽式反应器（CSTR）成功启动了两个平行的食物垃圾（FW）和剩余活性污泥（WAS）消化系统，并研究了不同污泥停留时间（SRT）缩减程度对FW和WAS共消化的影响。当有机负荷率（OLR）增加时，SRT缩减程度超过8.3天不利于共消化系统的稳定运行。SRT的缩减程度应从5天逐渐降至0.9天，以实现FW和WAS共消化的高负荷稳定运行。经过长期运行（约282天），共消化在SRT为9.1天、OLR（以化学需氧量（COD）计算）为（12.9±1.5）g·（L·d）时达到稳定运行。相应的甲烷产量、甲烷产率（以COD计算）、pH值和挥发性脂肪酸（VFA，以COD计算）分别为3.94 - 4.25 L·（L·d）、288 - 302 mL·g、7.80 - 7.83和0.32 - 0.39 g·L。此外，还研究了高负荷率下FW和WAS共消化的污泥特性。结果表明，FW和WAS共消化过程中甲烷转化的主要途径是通过乙酸。同时，还测定了乙酸、丙酸、丁酸、戊酸的较高产甲烷活性和辅酶F浓度。
