超声联合热碱预处理促进剩余污泥中温厌氧消化研究

doi:10.19741/j.issn.1673-4831.2018.0056

Abstract

Abstract:

Semi-continuous mesophilic anaerobic digestion assays were performed to assess the influence of combined ultrasonic, thermo-alkaline pretreatment on biodegradability of waste activated sludge (WAS). The pretreated WAS was obtained at optimal conditions of temperature 73℃, alkaline dosage 0.085 g·g^-1 total solids (TS) and specific energy 9 551 kJ·kg^-1 TS. During anaerobic digestion, the average daily methane production of pretreated WAS was as high as 234 mL, which was 1.94 times that of untreated WAS. Furthermore, modified-Gompertz model was introduced to predict the methane production and evaluate the kinetic parameters. The modified-Gompertz models (R²:0.998 and 0.993 for pretreated and untreated WAS, respectively) show good fit to the experimental results. For pretreated WAS, kinetic constants of methane production model using modified-Gompertz were P (methane production potential, 5 376.4 mL), R_m (maximum methane production rate, 394.8 mL·d^-1), λ (minimum time to produce methane, 2.8 days). Besides, the ratio of methane conversion of pretreated WAS achieved at 82.17%. During anaerobic digestion, concentrations of soluble chemical oxygen demand (SCOD), soluble protein (SP), and soluble carbohydrates (SC) of pretreated WAS were much higher than that of the untreated WAS. Therefore, the reductions of total suspended solids (TSS) and volatile suspended solids (VSS) were 54.9% and 61.8% for pretreated WAS after pretreatment and anaerobic digestion. Based on results obtained above, it is suggested that combined ultrasonic, thermo-alkaline pretreatment improves sludge disintegration as well as increases biodegradability, resulting to anaerobic digestion enhancement.

Key words: combined ultrasonic, thermo-alkaline pretreatment, mesophilic anaerobic digestion, modified-Gompertz model, soluble organic matters, reduction of volatile suspended solids

CLC Number:

X705

XU Hui-min, QIN Wei-hua, LI Zhong-lin, GU Qi, DAI Xiao-hu. Upgrading Semi-Continuous Mesophilic Anaerobic Digestion of Waste Activated Sludge by Combined Ultrasonic, Thermo-Alkaline Pretreatment[J]. Journal of Ecology and Rural Environment, 2019, 35(1): 91-97.

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Upgrading Semi-Continuous Mesophilic Anaerobic Digestion of Waste Activated Sludge by Combined Ultrasonic, Thermo-Alkaline Pretreatment

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