Effect of full-scale ultrasonic pretreatment on anaerobic digestion performance of sludge with different solid concentrations
ZHANG Bo 1,2, , ZHAO Yihua 2, JI Min 1, , , CHU Yiwei 2, MA Tongyu 2 1.School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China 2.Tianjin Eco-City Water Investment and Construction Co. Ltd., Tianjin 300467, China
Abstract:To resolve the problem of low hydrolysis rate of activated sludge during anaerobic digestion process, an industrial scale ultrasonic reactor was used to disintegrate excess sludge under different solid concentrations. The physical and chemical characters of sludge before and after ultrasonic disintegration were evaluated in terms of particle size, and soluble COD, protein, carbohydrate. Effects of ultrasonic disintegration on cumulative methane yield and organism decomposition during anaerobic digestion process were studied. The results indicated that with the pretreatment of ultrasonic operation, the particle size of sludge was reduced, while an obvious increase of the concentrations of SCOD, soluble protein and carbohydrate occurred. The disintegration degree increased with sonication time extension, and decreased with the increase of solid concentrations. After 30 min ultrasonic pretreatment of 2% and 4% TS sludge, their methane yield increased up to 41.2% and 30.2%, respectively. However, there was no obvious increase of methane yield as ultrasonic time and sludge TS further increased. Through above research, the results provide technological support for ultrasonic pretreatment at industrial scale. Key words: full-scale/ ultrasonic pretreatment/ sludge pretreatment/ activated sludge/ anaerobic digestion.
图2超声预处理后污泥平均粒径的变化 Figure2.Mean particle size of sludge after ultrasonic pretreatment
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图3超声预处理后污泥SCOD的变化 Figure3.Variation of sludge SCOD after ultrasonic pretreatment
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图4超声预处理后污泥中溶解性蛋白质浓度的变化 Figure4.Changes in soluble protein concentration of sludge after ultrasonic pretreatment
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图5超声预处理后污泥中溶解性多糖浓度的变化 Figure5.Changes in soluble carbohydrate concentration of sludge after ultrasonic pretreatment
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图6超声预处理2% TS污泥后累积甲烷产率的变化 Figure6.Changes in cumulative methane yield of 2% TS sludge after ultrasonic pretreatment
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图7超声预处理后4% TS污泥累积甲烷产率的变化 Figure7.Changes in cumulative methane yield of 4% TS sludge after ultrasonic pretreatment
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图8超声预处理后6%、8%和10%TS污泥累积甲烷产率的变化 Figure8.Change in cumulative methane yields of 6%,8% and 10% TS sludge after ultrasonic pretreatment
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表1超声预处理后污泥VS去除率的变化 Table1.Changes in VS removal of sludge after ultrasonic pretreatment
TS浓度/%
VS去除率(对照组)/%
VS去除率(超声处理)/%
超声15 min
超声30 min
超声45 min
超声60 min
2
34.83
36.67
41.17
40.68
42.61
4
33.52
35.02
42.44
41.70
42.94
6
32.11
33.74
32.08
34.21
31.04
8
28.54
30.01
29.62
29.55
28.42
10
28.27
27.32
29.09
30.62
28.33
TS浓度/%
VS去除率(对照组)/%
VS去除率(超声处理)/%
超声15 min
超声30 min
超声45 min
超声60 min
2
34.83
36.67
41.17
40.68
42.61
4
33.52
35.02
42.44
41.70
42.94
6
32.11
33.74
32.08
34.21
31.04
8
28.54
30.01
29.62
29.55
28.42
10
28.27
27.32
29.09
30.62
28.33
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Effect of full-scale ultrasonic pretreatment on anaerobic digestion performance of sludge with different solid concentrations
ZHANG Bo 1,2, , ZHAO Yihua 2, JI Min 1, , , CHU Yiwei 2, MA Tongyu 2
Corresponding author: JI Min, jimin@tju.edu.cn ;
1.School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China 2.Tianjin Eco-City Water Investment and Construction Co. Ltd., Tianjin 300467, China Received Date: 2019-01-02 Accepted Date: 2019-04-08 Available Online: 2019-09-17 Keywords: full-scale/ ultrasonic pretreatment/ sludge pretreatment/ activated sludge/ anaerobic digestion Abstract:To resolve the problem of low hydrolysis rate of activated sludge during anaerobic digestion process, an industrial scale ultrasonic reactor was used to disintegrate excess sludge under different solid concentrations. The physical and chemical characters of sludge before and after ultrasonic disintegration were evaluated in terms of particle size, and soluble COD, protein, carbohydrate. Effects of ultrasonic disintegration on cumulative methane yield and organism decomposition during anaerobic digestion process were studied. The results indicated that with the pretreatment of ultrasonic operation, the particle size of sludge was reduced, while an obvious increase of the concentrations of SCOD, soluble protein and carbohydrate occurred. The disintegration degree increased with sonication time extension, and decreased with the increase of solid concentrations. After 30 min ultrasonic pretreatment of 2% and 4% TS sludge, their methane yield increased up to 41.2% and 30.2%, respectively. However, there was no obvious increase of methane yield as ultrasonic time and sludge TS further increased. Through above research, the results provide technological support for ultrasonic pretreatment at industrial scale.