Article
Environmental Sciences
Tengfei Li, Yanhui Fan, Hu Li, Zhiyin Ren, Liqing Kou, Xuetao Guo, Hanzhong Jia, Tiecheng Wang, Lingyan Zhu
Summary: Efficient sludge reduction was achieved by discharge plasma oxidation in this study, with approximately 18.22% sludge disintegration and 27.8% reduction of total suspended solids. The generation of reactive oxygen species played a crucial role in sludge disintegration by destroying flocs and promoting the conversion of organic substances, while concurrent cell lysis released intracellular organics and water into the liquid phase.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Environmental
Barbara Tonanzi, Agata Gallipoli, Andrea Gianico, Maria Cristina Annesini, Simona Crognale, Giuseppe Mininni, Simona Rossetti, Camilla Maria Braguglia
Summary: Future sustainable technological solutions should balance the development of sludge as a resource with the need to protect human health and the environment. This study explored the feasibility of pretreating sludge with ultrasound and using anaerobic microorganisms to recover valuable resources. The results showed that acid addition and thermal treatment were effective strategies to promote solubilization and acidification of the system, while high abundance of hydrolytic and fermentative bacteria contributed to the successful conversion of volatile fatty acids into methane. The study also presented a mass and energy balance for a full-scale scenario of this innovative biorefinery platform.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Environmental
Xianbao Wang, Yili Xie, Xuefei Qi, Tiantian Chen, Yudi Zhang, Chuyue Gao, Anlong Zhang, Wu'ang Ren
Summary: A novel mechanical cutting pretreatment method was studied to improve the fermentation and anaerobic digestion of primary sludge (PS). The method significantly enhanced the performance by reducing particle size, increasing soluble COD, and promoting the production of volatile fatty acids and biogas. Mechanical pretreatment enriched bacteria, but had little effect on archaea.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Environmental Sciences
Hekai Jin, Song Lin, Yueyun Yang, Zhixin Liang, Yiqi Chen, Lei Hua, Ying Zhang, Hongtao Jia, Guodong Zhang, Tiecheng Wang
Summary: This study investigates the disintegration of excess sludge by non-thermal discharge plasma coupled with thiosulfate (TSA). The addition of TSA enhances the production of reactive oxygen species, which decompose floc structures and facilitate the transformation of organic compounds, resulting in improved dewaterability of the sludge.
Article
Environmental Sciences
Dehao Yuan, Xu Zhou, Wenbiao Jin, Wei Han, Huizhong Chi, Wanqing Ding, Yan Huang, Zhongqi He, Shuhong Gao, Qilin Wang
Summary: The addition of hydrogen peroxide significantly enhances the release of organic matter and nutrients during ultrasonic treatment of excess sludge. By optimizing the operating conditions, more efficient sludge destruction and reduction can be achieved.
Article
Chemistry, Physical
Katarzyna Pazdzior, Marlena Dominska, Magdalena Olak-Kucharczyk
Summary: Ozonation treatment can enhance biogas production from surplus activated sludge by increasing production efficiency and methane content. The elemental composition and chemical structure of sludge were not affected by ozonation, but hydrolysis of organic compounds from sludge contributed to the improvement of biogas production.
Article
Engineering, Environmental
Lixin Tian, Haixiao Guo, Yufen Wang, Jiaqi Hou, Tingting Zhu, Yindong Tong, Peizhe Sun, Yiwen Liu
Summary: A novel strategy using urine wastewater derived from source separation technology to pretreat waste activated sludge for increasing short-chain fatty acid (SCFA) yields has been proposed. The experimental results showed that SCFA production significantly increased when urine was added at a specific volumetric proportion. In addition, the presence of metal ions in urine waste was found to alleviate the inhibition effect on hydrolysis and acidogenesis.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Green & Sustainable Science & Technology
Yu-Ting Zhang, Wei Wei, Bing-Jie Ni
Summary: This study investigated the impact of ZnO NPs on hydrogen accumulation during WAS fermentation, aiming to provide insights into the mechanisms of enhanced hydrogen production. The results showed significantly increased hydrogen yields while avoiding hydrogen consumption by maintaining pH around 10, suggesting a green and economic strategy for sustainable engineering application of WAS containing ZnO NPs.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Agricultural Engineering
Ying Gao, Jianwei Zhao, Chengzhi Qin, Qingjiang Yuan, Jiangwei Zhu, Yingjie Sun, Chenggang Lu
Summary: Fluoxetine inhibits biohydrogen production in anaerobic dark fermentation, even at low concentrations. High levels of fluoxetine reduce every step associated with biohydrogen production, including decreasing concentrations of ammonia nitrogen and phosphate and having a significant negative effect on enzyme activity.
BIORESOURCE TECHNOLOGY
(2021)
Article
Environmental Sciences
Yunfeng Xu, Qinghao Zhou, Xin Wang, Min Yang, Yangfan Fang, Yongsheng Lu
Summary: The study investigated the correlation between anaerobic fermentation of waste activated sludge with electrochemical pretreatment, and the release of phosphorus and disintegration of sludge. Results showed that electrochemical pretreatment significantly increased the release of phosphorus and promoted sludge disintegration. Additionally, it led to reduced metal ion content in the sludge supernatant.
Article
Agricultural Engineering
Mohammad Javad Bardi, Ammad Mahmood, Thomas Lippert, Jochen Bandelin, Konrad Koch
Summary: This study evaluated the impact of ultrasonic treatment on two different waste activated sludges under different hydrostatic pressures. It was found that moderate pressure levels can significantly enhance the disintegration of waste activated sludge, but the enhancement effect decreases with higher pressure levels. However, the increase in specific methane yield does not show a significant correlation with the degree of disintegration. Positive energy balance can only be achieved with ultrasonication under elevated hydrostatic pressure.
BIORESOURCE TECHNOLOGY
(2022)
Article
Environmental Sciences
Agnieszka Garlicka, Przemyslaw Kupidura, Piotr Krawczyk, Katarzyna Umiejewska, Adam Muszynski
Summary: The circular economy model is an alternative to the depletion of non-renewable fossil fuels, and sewage sludge can be converted into biogas as a renewable energy source. The efficiency of this process depends on the availability of substrates, but the re-flocculation of disintegrated sludge may reduce the availability of organic compounds for microbes. Pilot-scale studies were conducted to select parameters for scaling-up the pre-treatment and intensifying the anaerobic digestion process.
Article
Chemistry, Multidisciplinary
Cherifi Mouna, Belkacem Merzouk, Hazourli Sabir, Debra F. Laefer, Atba Wafa
Summary: This study investigates the feasibility of using H2O2 oxidation and electrocoagulation as pretreatment techniques for sludge stabilization. The results show that using aluminum electrodes for electrocoagulation achieves better sludge disintegration and settling compared to iron and zinc electrodes, with lower operating costs. H2O2 oxidation achieves a high degree of sludge disintegration.
SEPARATION SCIENCE AND TECHNOLOGY
(2023)
Article
Thermodynamics
Archana Kasinath, Hubert Bylinski, Wojciech Artichowicz, Anna Remiszewska-Skwarek, Malgorzata Szopinska, Ewa Zaborowska, Aneta Luczkiewicz, Sylwia Fudala-Ksiazek
Summary: This study investigated the effect of low-temperature pretreatment on the efficiency of anaerobic digestion of waste activated sludge (WAS). The results showed that low-temperature pretreatment increased methane production and improved energy performance. AD of pretreated WAS achieved a positive net energy balance.
Article
Agricultural Engineering
Pooja Radadiya, Jango Lee, Kaushik Venkateshwaran, Nicholas Benn, Hyung-sool Lee, Abid Hussain
Summary: This study investigated the impact of different GAC loadings and inoculum enrichment on acidogenic fermentation of food waste under high organic loading conditions. The results showed that a high GAC loading can improve hydrolysis and acidification yields, but the composition of SCFA varies with different loadings. Inoculum enrichment further enhanced hydrolysis and acidogenesis yields.
BIORESOURCE TECHNOLOGY
(2022)