朱曙光1,2,
欧阳匡中1,
左明明1,
姜宇1,
管冰镜1,
翟苏皖1,
王志伟1,
丁晨风1
1.安徽建筑大学环境与能源工程学院，合肥 230601
2.安徽省绿色建筑先进技术研究院，合肥 230601
基金项目: 安徽省科技重大专项 (16030801118)
安徽省高校自然科学研究重大项目 (KJ2016SD14，KJ2017ZD40)
天津市水质科学与技术重点实验室开放基金资助项目 (TJKLAST-ZD-2014-03)
Effect of ultrasonic cracking on nutrients and particle size of excess sludge
JIANG Yun1,,ZHU Shuguang1,2,
OUYANG Kuangzhong1,
ZUO Mingming1,
JIANG Yu1,
GUAN Bingjing1,
ZHAI Suwan1,
WANG Zhiwei1,
DING Chenfeng1
1.College of Environment and Energy Engineering, Anhui Jianzhu University, Hefei 230601, China
2.Anhui Advanced Technology Research Institute of Green Building, Hefei 230601, China
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摘要:利用超声技术破解剩余污泥，不仅能有效降低污泥含水率，提高污泥稳定性，还能在上清液中释放C、N和P等有机物，为污泥资源化利用提供条件。通过考察超声时间、功率及频率等因素，分析超声空化对污泥稳定化程度和污泥内含营养物质释放的影响规律，形成超声破解污泥的最优实验方案。综合考虑超声效果与节能，选择超声频率22 kHz，超声功率800 W，超声时间15 min为优化的工艺条件，其上清液中的COD浓度高达954.33 mg·L-1，总氮含量为153.16 mg·L-1，总磷含量为72.65 mg·L-1，污泥颗粒粒径显著减小，d50从原泥的34.82 μm减小至2.99 μm，并形成少量纳米级颗粒，探讨了纳米颗粒对污泥活性的影响，有利于后续污泥稳定化和减量化。
关键词: 超声波技术/
污泥颗粒/
超声时间/
超声功率/
超声频率
Abstract:Ultrasonic cracking excess sludge can not only decrease the water content in sludge and improve its stability, but also can release some organic species such as C, N and P from the sludge, which is beneficial for resource recycling and utilization. By examining the time, power and frequency of ultrasonic treatment, the effects of ultrasonic cavitation on the sludge stability and the nutrients releasing were systematically analyzed, which achieved the optimized experimental program for ultrasonic cracking excess sludge. Comprehensively considering the ultrasonic effect and energy–saving, the ultrasonic time of 15 min and power of 800 W with the frequency of 22 kHz were selected as the proper experimental parameters. In this condition, the concentrations of SCOD, total nitrogen and total phosphorus in the supernatant raised up to 954.33 mg·L-1, 153.16 mg·L-1 and 72.65 mg·L-1, respectively. Furthermore, the particle size of sludge was significantly reduced. For example, the particle size of d50 in the initial sludge was reduced from 34.82 μm to 2.99 μm. In addition, a small amount of nanoparticles were also produced. The effect of nanoparticles on sludge activity was briefly discussed, which was proposed to be conducive to the stabilization and reduction of subsequent sludge.
Key words:ultrasonic technology/
sludge particulates/
ultrasonic time/
ultrasonic power/
ultrasonic frequency.
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超声破解对剩余污泥内含营养物及粒径的影响
江云1,,朱曙光1,2,
欧阳匡中1,
左明明1,
姜宇1,
管冰镜1,
翟苏皖1,
王志伟1,
丁晨风1
1.安徽建筑大学环境与能源工程学院，合肥 230601
2.安徽省绿色建筑先进技术研究院，合肥 230601
基金项目: 安徽省科技重大专项 (16030801118) 安徽省高校自然科学研究重大项目 (KJ2016SD14，KJ2017ZD40) 天津市水质科学与技术重点实验室开放基金资助项目 (TJKLAST-ZD-2014-03)
关键词: 超声波技术/
污泥颗粒/
超声时间/
超声功率/
超声频率
摘要:利用超声技术破解剩余污泥，不仅能有效降低污泥含水率，提高污泥稳定性，还能在上清液中释放C、N和P等有机物，为污泥资源化利用提供条件。通过考察超声时间、功率及频率等因素，分析超声空化对污泥稳定化程度和污泥内含营养物质释放的影响规律，形成超声破解污泥的最优实验方案。综合考虑超声效果与节能，选择超声频率22 kHz，超声功率800 W，超声时间15 min为优化的工艺条件，其上清液中的COD浓度高达954.33 mg·L-1，总氮含量为153.16 mg·L-1，总磷含量为72.65 mg·L-1，污泥颗粒粒径显著减小，d50从原泥的34.82 μm减小至2.99 μm，并形成少量纳米级颗粒，探讨了纳米颗粒对污泥活性的影响，有利于后续污泥稳定化和减量化。
English Abstract
Effect of ultrasonic cracking on nutrients and particle size of excess sludge
JIANG Yun1,,ZHU Shuguang1,2,
OUYANG Kuangzhong1,
ZUO Mingming1,
JIANG Yu1,
GUAN Bingjing1,
ZHAI Suwan1,
WANG Zhiwei1,
DING Chenfeng1
1.College of Environment and Energy Engineering, Anhui Jianzhu University, Hefei 230601, China
2.Anhui Advanced Technology Research Institute of Green Building, Hefei 230601, China
Keywords: ultrasonic technology/
sludge particulates/
ultrasonic time/
ultrasonic power/
ultrasonic frequency
Abstract:Ultrasonic cracking excess sludge can not only decrease the water content in sludge and improve its stability, but also can release some organic species such as C, N and P from the sludge, which is beneficial for resource recycling and utilization. By examining the time, power and frequency of ultrasonic treatment, the effects of ultrasonic cavitation on the sludge stability and the nutrients releasing were systematically analyzed, which achieved the optimized experimental program for ultrasonic cracking excess sludge. Comprehensively considering the ultrasonic effect and energy–saving, the ultrasonic time of 15 min and power of 800 W with the frequency of 22 kHz were selected as the proper experimental parameters. In this condition, the concentrations of SCOD, total nitrogen and total phosphorus in the supernatant raised up to 954.33 mg·L-1, 153.16 mg·L-1 and 72.65 mg·L-1, respectively. Furthermore, the particle size of sludge was significantly reduced. For example, the particle size of d50 in the initial sludge was reduced from 34.82 μm to 2.99 μm. In addition, a small amount of nanoparticles were also produced. The effect of nanoparticles on sludge activity was briefly discussed, which was proposed to be conducive to the stabilization and reduction of subsequent sludge.
