Article
Engineering, Environmental
Yunbei Li, Zexu Chen, Hailong Li, Qianjing Yao, Yi Wei, Xin Wang, Ninghao Wang, Xinyu Cao, Mengyu Zheng, Jinghua Lv, Zhensheng Guo, Jishao Jiang
Summary: Bioleaching using acidified sludge (AS) as inoculum can accelerate dewatering and improve heavy metal removal efficiency, by enhancing Fe2+ oxidation and reducing pH levels. This method can effectively reduce heavy metal content and enhance treatment efficiency.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2022)
Article
Engineering, Environmental
Yi Lu, Xiaoqing Meng, Jiajun Wang, Mahlatsi Yorgan Dieketseng, Yifan Xiao, Su Yan, Yu Chen, Lixiang Zhou, Guanyu Zheng
Summary: Conditioning can significantly improve the dewaterability of sewage sludge, with bioleaching conditioning showing superior results in reducing the abundance of ARGs in compost products compared to chemical conditioning using Fe[III]/CaO or PAM. Additionally, bioleaching conditioning resulted in the lowest abundances of ARG subtypes and ARG-associated bacteria in the sludge compost product.
Article
Engineering, Geological
Jia Li, Yong Ma, Youquan Liu, Qiang Liu
Summary: The quality of mud cake is crucial for evaluating the plugging capacity of workover fluid and plays a significant role in wellbore stability and reservoir protection. This study established a hydraulic mechanical coupling model to investigate the mechanism of mud cake dynamic characteristics and examined the influence of various factors on mud cake properties. The results showed that improving mud cake sealing performance is beneficial for broadening the safe mud weight window.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Engineering, Chemical
Hamed Movahedi, Saeid Jamshidi
Summary: The present study investigates the impact of salinity, shear flow, and flux rate on the dynamic filtration of concentrated slurry fluids containing colloidal clay particles. The results showed that increasing suspension salinity reduces rheological properties and increases cake permeability, while increasing flux rate condenses the cake and reduces erosion. A model for predicting fouling removal rate during dynamic filtration was developed and found to accurately describe the thickness patterns.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Environmental Sciences
Kai Chen, Yue Sun, Jun Fan, YingPeng Gu
Summary: The study investigates the use of bioleaching combined with coal fly ash (BL-CFA) process to improve sludge dewatering performance. The BL-CFA process reduces the water content of the sludge and enhances the dewatering effect. Analysis of extracellular polymeric substances (EPS), fluorescence, Fourier transform infrared (FTIR) spectroscopy, and particle size variation, along with scanning electron microscopy (SEM), reveals the mechanisms behind the improvement in sludge dewatering. The BL-CFA process shows potential for superior sludge dewatering performance.
Article
Engineering, Environmental
Long Su, Lingyu Hu, Qinghong Sui, Chengcheng Ding, Di Fang, Lixiang Zhou
Summary: Fungal extraction with Aspergillus niger was used to reclaim phosphorus from sewage sludge ash (SSA), using an organic-rich effluent produced in sludge dewatering as a nutrient source. After 5 days of fungal treatment, 85% of the phosphorus was leached from the ash, mainly due to the dissolution of Ca3(PO4)2, AlPO4, FePO4, and Mg3(PO4)2. A hydroxyapatite (HAP) product with a purity of > 85% was obtained from the extract after removal of metal cations by cation exchange resin (CER) and precipitation with CaCl2. Ultimately, 73.2 wt% of phosphorus was recovered from SSA through integrated fungal extraction, CER purification, and HAP crystallization.
Article
Engineering, Environmental
Ting Li, Jiawei Yang, Yujun Zhou, Yixin Luo, Bo Zhou, Di Fang, Jiansheng Li, Lixiang Zhou
Summary: Bioleaching facilitated by iron-oxidizing bacteria is a promising and cost-effective method for sludge dewatering. Increasing the production of reactive oxygen species (ROS) through the introduction of H2O2 can significantly improve dewaterability and shorten the treatment time.
Review
Environmental Sciences
Yankai Liang, Rui Wang, Wenquan Sun, Yongjun Sun
Summary: This article analyzes the composition and properties of municipal sludge and examines the factors affecting its dewatering performance. It introduces various chemical conditioning methods and systematically analyzes the principles and applications of existing sludge conditioning technologies. It emphasizes the importance of developing a more appropriate combination of sludge conditioning and dewatering processes and optimizing the dewatering process by developing new efficient and environmentally friendly sludge conditioning agents.
Article
Environmental Sciences
Ting Li, Jiawei Yang, Yujun Zhou, Xuan Liu, Yixin Luo, Di Fang, Jianru Liang, Jiansheng Li, Lixiang Zhou
Summary: In recent years, bioleaching has become a cost-effective technology for improving sludge dewaterability. This study developed a novel approach combining short-time bioleaching with polyferric sulfate flocculation, achieving comparable dewatering results to conventional long-time bioleaching. These findings provide new insights for developing efficient sludge dewatering strategies.
ENVIRONMENTAL RESEARCH
(2023)
Article
Environmental Sciences
Yun bei Li, Jun li Song, Qian jing Yao, Ze xu Chen, Yi Wei, Hai long Li, Meng xiao Wang, Bing jing Wang, Jia min Zhou
Summary: Increasing dissolved oxygen concentration can enhance bioleaching efficiency, improve sludge dewatering performance, and facilitate the removal of heavy metals. Additionally, the degradation of EPS and sludge floc fragmentation play vital roles in the bioleaching process.
Article
Engineering, Environmental
Jiuqi Shen, Xingqiu Zhou, Lang Zhou, Zhongjun Huang, Shufeng Huang
Summary: Electro-dewatering is an efficient and energy-saving technology for deep dewatering of sludge, which is significantly influenced by the physicochemical properties of the sludge. In this study, sludge conditioning by microbial fuel cell was innovatively coupled with electro-dewatering, resulting in higher dewatering efficiency and economic benefits.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Environmental Sciences
Jian Yao, Miaoxiao Wang, Lu Wang, Min Gou, Jing Zeng, Yue-Qin Tang
Summary: This study investigated the enhancing roles of four species in improving the chromium bioleaching efficiency of Acidithiobacillus thiooxidans in tannery sludge. The results showed that these species significantly improved the bioleaching performance, with a 100% chromium bioleaching efficiency achieved on the sixth day when co-inoculating A. thiooxidans and the four auxiliary species.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Green & Sustainable Science & Technology
Haochi Zhang, Dejin Zhang, Yujun Zhou, Di Fang, Chunhong Cui, Jianru Liang, Bo Zhou, Mingjiang Zhang, Jiansheng Li, Lixiang Zhou
Summary: This study found that bioleaching was not effective for anaerobically digested sludge (ADS) compared to undigested sludge (UDS). The specific resistance to filtration of ADS increased during bioleaching, and the pH value of ADS remained unchanged at 7.97, while it decreased to 2.98 for UDS. Added Fe2+ was not detected as an energy source for ADS. Higher alkalinity and unavailable Fe2+ in ADS hindered the growth of Acidithiobacillus species. Aeration significantly deteriorated the dewaterability of ADS through bioleaching, with a drastic increase in sludge pH and slime EPS content.
Article
Environmental Sciences
Xiaolei Zhang, Ji Li, Wei Yang, Jiaxin Chen, Xiaochun Wang, Dingyu Xing, Wenyi Dong, Hongjie Wang, Jiawen Wang
Summary: Bioleaching was used to remove heavy metals from excess sludge generated during municipal wastewater treatment. Pretreatment of aerobic digestion or concurrent aerobic digestion with bioleaching increased the leaching amounts and stable-state proportions of heavy metals. Although the ammonia nitrogen and total phosphorus content were still higher than the soil background value, the treated sludge still had agricultural value. The enrichment of acid-producing bacteria was the main reason for the pH decrease and heavy metal removal.
Article
Energy & Fuels
Hongguang Lv, Wei Chen, Xuegang Kang, Gen Huang, Jihui Li, Liqiang Ma
Summary: Classical filtration equations face challenges when applied in industrial settings due to their incorporation of microscopic parameters. Previous research has identified the influence of filter cake thickness and variations in filtration pressure on the filtration rate. This study derived a macroscopic filtration equation by expressing the properties of the coal slurry at a macroscopic level and relying on the viscosity of the filtrate.
INTERNATIONAL JOURNAL OF COAL PREPARATION AND UTILIZATION
(2023)