Article
Environmental Sciences
Gang Wang, Quancheng Shu, Yuliang Zhu, Yucan Liu, Xiaoyong Yang, Daishun Wu, Hongwei Sun
Summary: This study systematically investigated the efficiency and mechanism of thermally activated persulfate (TAP) oxidation technology in improving the dewatering performance of surplus activated sludge. The results showed that the TAP treatment significantly increased the filterability and decreased the particle size of the sludge. Additionally, it facilitated the disintegration of sludge and conversion of certain EPS components. The findings of this study provide insights into the mechanism of TAP process in enhancing sludge dewatering performance.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Agricultural Engineering
Pengfei Wan, Ying Liu, Quandi Zhang, Li Jiang, Heping Chen, Wenzhou Lv
Summary: Candida Tropicalis was used to improve the dewaterability of activated sludge (AS) by degrading EPS in AS, resulting in a decrease in protein, polysaccharide, and hydrophilic amino acids in EPS. The yeast degraded macromolecular organics into smaller molecular ones and direct addition of yeast to AS was more effective in EPS degradation. Addition of 0.75 g/L of wet yeast cells and 24 h of aeration enhanced the dewaterability of AS with a reduction in CST and MLSS. After 30 days of operation, lab-scale continuous SBRs reduced CST and MLSS of AS. FTIR spectroscopy showed a decrease in hydrophilic functional groups. This study presents a new approach for in-situ reduction of AS in wastewater treatment plants.
BIORESOURCE TECHNOLOGY
(2023)
Article
Environmental Sciences
Peng Yang, Dandan Li, Weijun Zhang, Jing Ai, Sainan Peng, Dongsheng Wang, Fengguo Cui
Summary: The study demonstrated that organic acids chelated ferrous ions can significantly enhance sludge dewaterability, leading to improved dewatering performance through the activation of NaClO.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Environmental Sciences
Ziheng Dai, Lei Liu, Haoran Duan, Biqing Li, Xia Tang, Xuewei Wu, Gang Liu, Liguo Zhang
Summary: A new combined conditioning process using lysozyme (LZM) and free nitrous acid (FNA) was proposed and demonstrated to enhance the dewaterability of waste activated sludge (WAS). The study revealed that the combined treatment led to improved hydrophobicity, reduced repulsive force of sludge particles, and enhanced flocculability, resulting in the release of bound water.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Green & Sustainable Science & Technology
Wanqing Ding, Wenbiao Jin, Xu Zhou, Qinhui Yang, Chuan Chen, Qilin Wang
Summary: This study investigated the dewaterability of anaerobic granular sludge (AGS) by Fe(II)-PDS conditioning, finding that Fe(II)-PDS conditioning can enhance dewaterability by breaking down EPS layers and microbial cell structures, releasing bound water and facilitating sludge re-flocculation. Protein was identified as the primary component in AGS and showed a strong correlation with dewaterability.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Multidisciplinary Sciences
Pan Hu, Shaohang Shen, Hu Yang
Summary: This study investigated the sludge dewatering performance of two series of binary graft cationic starch-based flocculants with different hydrophilicity and charge density. With increased charge density and moderate hydrophobicity, the dewaterability of sludge was found to improve, resulting in lower filter cake moisture content and resistance to filtration. The structure-activity relationship of these flocculants was evaluated quantitatively using a second-order polynomial model.
SCIENTIFIC REPORTS
(2021)
Article
Engineering, Environmental
Xiaoying Liu, Jie Liu, Dongkun Deng, Renjie Li, Chao Guo, Jinxia Ma, Ming Chen
Summary: The study revealed a positive correlation between EPS content and sludge granulation, with increased protein concentration facilitating microbial aggregation and sludge granulation. Environmental factors affect the properties of EPS, with different types of sludge generating varying levels of EPS and protein concentrations.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Environmental Sciences
Weiliang Pan, Jiaoni Li, Xun Zhang, Shan Liang, Yinghao Kang, Rui Deng, Li Gu, Qiang He
Summary: In this study, we investigated the dewaterability of sludge treated with KMnO4 at different pH levels. We observed a significant improvement in dewatering performance, as indicated by reduced capillary suction times (CST) and specific resistance to filtration (SRF) values. The reduction in tightly bound extracellular polymeric substances (EPS) was also observed. Spectroscopic and electrochemical analysis provided insights into the mechanisms underlying the improved dewatering performance, which involved changes to the physicochemical properties and EPS of the sludge.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Environmental Sciences
Chengyu Jiang, Qingjin Chen
Summary: At a concentration of 10 μg/L, nanoparticles reduce sludge dewaterability, while an improvement is observed at 100 μg/L. Aging can alleviate the effects of these two concentrations on sludge dewatering.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Environmental Sciences
Rong Deng, Jiahao Lai, Zonghao Liu, Bing Song, Huan Liu, Dandan Chen, Gancheng Zuo, Zhen Yang, Fanyue Meng, Tingting Gong, Min Song
Summary: This research proposes a hypothesis for the co-disposal of sludge and coal slime to improve dewaterability. by utilizing the beneficial role of coal slime as a filter assist and CaO2 enhanced system. The results showed that under optimal conditions, the capillary suction time, specific resistance to filtration, and water content decreased significantly. The Fe2+/CaO2/coal slime combined system was proved to have a promising application prospect in enhancing sludge dewaterability.
Article
Environmental Sciences
Lu Bai, Guanjun Wang, Dongdong Ge, Yanting Dong, Hui Wang, Yuhui Wang, Nanwen Zhu, Haiping Yuan
Summary: Dewatering treatment is essential for reducing sludge volume, transportation costs, and improving disposal efficiency. This study investigated the use of the ozone-peroxymonosulfate (O-3/PMS) oxidation process to enhance sludge dewaterability. The results showed that the optimal dosage of 30 mg/g TS O-3 and 0.4 mmol/g TS PMS effectively reduced the sludge capillary suction time and water content, improved sludge zeta potential, particle size, and fluidity, and enhanced sludge dewatering performance. The study also analyzed the factors responsible for the improved dewaterability, such as changes in hydrophilic substances and protein secondary structure. The study found that the O-3/PMS process reduced the concentrations of heavy metals and polycyclic aromatic hydrocarbons (PAHs) in the sludge, as well as their stability and toxicity, except for zinc.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
You Ma, Pei-Kun Yuan, Yu Wu, Han Meng, Guo-Xiang Wang, Wen-Ming Xie, Li-Min Zhang, Jie Ma, Yan Xiao
Summary: This study investigated the role of main components of extracellular polymeric substances (EPS) in antibiotic adsorption through enzymatic treatment of activated sludge. The results showed that proteinase K and alpha-amylase can efficiently hydrolyze the proteins and polysaccharides of EPS, significantly enhancing the adsorption capacity of activated sludge for antibiotics. A multivariable linear regression model was successfully developed to quantify the impact of EPS components on antibiotic adsorption.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Environmental Sciences
Antonio Melo, Joana Costa, Cristina Quintelas, Eugenio C. Ferreira, Daniela P. Mesquita
Summary: The study compared biomass stress-responses under long-term exposure to ibuprofen and found that IBU significantly reduced the removal efficiencies of COD and NH4+, while the composition of EPS also changed, with higher protein content in TBEPS during phases containing IBU.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Environmental Sciences
You Ma, Pei-Kun Yuan, Yu Wu, Xin-Ying Cheng, Han Meng, Huan He, Guo-Xiang Wang, Xue-Ming Chen, Wen-Ming Xie, Li-Min Zhang
Summary: The study found that removing EPS from activated sludge can increase the adsorption capacity for TMP at environmentally relevant concentrations.
Article
Engineering, Environmental
Zongcai Yang, Shulei Liu, Yuqiong Tang, Yingping Zhou, Lin Xiao
Summary: In this study, a three dimensional electro-Fenton (3D-EF) method using Fe modified sludge biochar (Fe@SBC) as particle electrode, heterogeneous Fenton catalyst and skeleton builder was proposed for deep dewatering of sludge under neutral pH. Compared with EF, 3D-EF with Fe@SBC800 showed higher ability in breaking macromolecules and removing functional groups in EPS, which could facilitate release of bound water and self-coagulation of fine flocs.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Agricultural Engineering
Meng Zhang, Bin Ji, Shulian Wang, Jun Gu, Yu Liu
Summary: This study found a strong correlation between extracellular polymeric substances of microalgal-bacterial granules and the granule size. The granule size had a positive effect on the removal of specific organics in wastewater, but a negative effect on ammonium and phosphorus removal. Granule size can be used as an indicator to reflect the synergistic interactions between microalgae and bacteria in microalgal-bacterial granules.
BIORESOURCE TECHNOLOGY
(2022)
Article
Engineering, Environmental
Zhoujie Pi, Kunjie Hou, Fubing Yao, Li He, Shengjie Chen, Ziletao Tao, Puyu Zhou, Dongbo Wang, Xiaoming Li, Qi Yang
Summary: NHGBC-800 showed excellent adsorption performance and PDS activation ability, allowing for simultaneous removal of organic contaminants and regeneration of the adsorbent. Furthermore, NHGBC-800 maintained good performance under different pH conditions and in the presence of inorganic anions.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Environmental Sciences
Siyu Wang, Hang Liu, Jun Gu, Meng Zhang, Yu Liu
Summary: An integrated AnfMBR-RO-chlorination process was developed to address the drawbacks of excessive sludge generation and high energy consumption in municipal wastewater reclamation. The process showed high removal rates of COD, phosphate, and NH4+-N, and significantly reduced energy consumption and greenhouse gas emissions compared to current methods, bringing municipal wastewater reclamation closer to carbon neutrality and water sustainability.
Article
Environmental Sciences
Zhen Gao, Yingqun Ma, Yu Liu, Qunhui Wang
Summary: This study developed a co-fermentation strategy using waste cooking oil (WCO) and food waste for microbial lipid production. It was found that adjusting the pH values within a certain range could increase lipid production efficiency. The produced lipid could potentially be used for biodiesel production, leading to significant reductions in CO2 and SO2 emissions from global food waste.
ENVIRONMENTAL RESEARCH
(2022)
Article
Environmental Sciences
Jun Zhang, Yi-ping Wan, Ze-hua Liu, Hao Wang, Zhi Dang, Yu Liu
Summary: The stability of C-NEs in aqueous environmental samples is influenced by different storage conditions, with low temperature of 4 degrees C leading to easy deconjugation, while pH of 3 and addition of HgCl2 can keep C-NEs intact at room temperature. Addition of HgCl2 is more convenient and practical for 24-h composite sampling.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Environmental Sciences
Jun Zhang, Shu-shu Zhong, Ke-meng Zhao, Ze-hua Liu, Zhi Dang, Yu Liu
Summary: Sulfite can effectively inhibit arylsulfatase, potentially disrupting estrogen homeostasis in humans, which requires further investigation.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Environmental Sciences
Xiaoming Li, Kexin Sui, Jiamin Zhang, Xuran Liu, Qiuxiang Xu, Dongbo Wang, Qi Yang
Summary: The study found that the maximum hydrogen yield from waste activated sludge increased with the concentration of Rhamnolipid (RL) up to 0.10 g/g TSS. However, further enhancement to 0.12 g/g TSS slightly reduced the hydrogen production. The research suggested that RL facilitated the solubilization of waste activated sludge and improved the proportion of biodegradable substances available for hydrogen production.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Qi Huang, Kun Luo, Zhoujie Pi, Li He, Fubing Yao, Shengjie Chen, Kunjie Hou, Yujie Liu, Xiaoming Li, Qi Yang
Summary: In this study, a low-cost and high-efficiency phosphate adsorbent ZrBC was successfully synthesized and demonstrated strong adsorption ability for low-concentration phosphate in water. The adsorption process was mainly chemical adsorption and single-layer adsorption, described well by pseudo-second-order and Langmuir isotherm models. ZrBC showed superior treatment capacities for simulated secondary effluents.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Engineering, Environmental
Li He, Fubing Yao, Yu Zhong, Chang Tan, Kunjie Hou, Zhoujie Pi, Shengjie Chen, Xiaoming Li, Qi Yang
Summary: In this study, a binder-free composite cathode with low-energy consumption and long-term stability was successfully synthesized. Compared with monometallic composite cathode, this composite cathode exhibited better performance in NO3- removal and energy consumption, and maintained good electrocatalytic performance and stability in a wide range of conditions.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Environmental Sciences
Yuting Shi, Bin Ji, Xiaoyuan Zhang, Yu Liu
Summary: The microalgal-bacterial granular sludge (MBGS) process, as a new green wastewater treatment technology, was evaluated for its performance in treating municipal wastewater under outdoor conditions. The study discovered the auto-floating phenomenon and its causes.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Agricultural Engineering
Xiaodong Zhang, Xiaoding Huang, Xiaoming Li, Jiamin Zhang, Mengge Tang, Xuran Liu, Dongbo Wang, Qi Yang, Abing Duan, Junwu Liu
Summary: This study proposed a citric acid (CA) treatment strategy for improving short-chain fatty acids (SCFAs) production from waste activated sludge (WAS), with the optimum SCFAs yield reaching 384.4 mg COD/g VSS with 0.08 g CA/g TSS addition. The biodegradation of CA contributes to the yield of total SCFAs, especially acetic acid. The presence of CA enhances sludge decomposition, fermentation substrate biodegradability, and the abundance of fermenting microorganisms.
BIORESOURCE TECHNOLOGY
(2023)
Article
Environmental Sciences
Yi-Kun Geng, Jun Gu, Xiaoyuan Zhang, Zhuan Khai Lim, Yishuai Jiang, Meng Zhang, Yan Zhou, Yu Liu
Summary: This study developed an innovative A-B process for carbon-neutral wastewater treatment by combining an anaerobic biofilm reactor (AnBR) as the A stage for energy recovery and a step-feed membrane bioreactor (MBR) as the B stage for mainstream deammonification. A multi-parameter control-based operation strategy was developed to address the challenge of selectively retaining ammonia-oxidizing bacteria (AOB) over nitrite oxidizing bacteria (NOB). Results showed that this process configuration achieved high removal rates of COD, ammonium-N, and total nitrogen, while promoting the growth and enrichment of anammox bacteria.
Article
Environmental Sciences
Xiaoyuan Zhang, Bin Ji, Junli Tian, Yu Liu
Summary: This study reported the development, performance, and microbial community of microalgal-bacterial biofilms for municipal wastewater treatment in a continuous-flow photoreactor. The results showed that microalgal-bacterial biofilms were successfully developed without external aeration. The biofilm concentrations reached steady-state at 4690 mg/L with a hydraulic retention time (HRT) of 9 h. Increasing HRT to 12 h did not enhance the biofilm accumulation but resulted in faster growth of microalgae, while the chlorophyll-a&b content in biofilms stabilized after the initial stage. Performance analysis revealed that microalgal-bacterial biofilms removed 90% of TOC, 71.4% of total nitrogen, and 72.6% of phosphorus in the steady-state photoreactor run at an HRT of 12 h with external aeration. Cyanobacteria and Chloroflexi were the dominant components, while Chlorophyta dominated the eukaryotic algal community in biofilms. This study provides insights into the development of microalgal-bacterial biofilms for sustainable low-carbon municipal wastewater treatment in continuous-flow photoreactors.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Engineering, Environmental
Xin-Jia Chen, Chang-Wei Bai, Yi-Jiao Sun, Xin-Tong Huang, Bin-Bin Zhang, Yi-Shuo Zhang, Qi Yang, Jing-Hang Wu, Fei Chen
Summary: In the realm of wastewater treatment, the combined use of ferrate (Fe(VI)) and peracetic acid (PAA) as oxidants shows enhanced efficacy. However, the underlying mechanisms of their interaction at different pH levels and pollutant types are still unclear. This study investigates the complex oxidation interplay among Fe(VI)-PAA, Fe(VI)-H2O2, and standalone Fe(VI) systems, revealing that the Fe(VI)-PAA system outperforms its counterparts in degrading sulfamethoxazole pollutant at a pH of 9.0. The behavior of active species shifts with pH variations, indicating distinct degradation pathways. Understanding the role of pH is crucial in organic wastewater decontamination.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Review
Agricultural Engineering
Xiaoyuan Zhang, Lei An, Junli Tian, Bin Ji, Jinfeng Lu, Yu Liu
Summary: This article provides a preliminary analysis on the carbon capture potential of microalgal cultivation, indicating that the energy consumption and nutrient input can result in significant indirect carbon emissions, making microalgal carbon capture less effective. The current processes may not be environmentally sustainable and economically viable, thus renewable energy and cheap nutrient sources should be explored to reduce indirect carbon emissions and promote complete nutrient recycling through using microalgae as biofertilizers or aquafeeds.
BIORESOURCE TECHNOLOGY
(2023)
