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Sen TK, Mesfin Yeneneh A, Jafary T, Al Balushi K, Hong E, Adewole JK, Hamed Al Hinai M, Shinde S. Municipal sewage sludge dewatering performance enhancement by ultrasonic cavitation and advanced oxidation: A case study. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2024; 89:2593-2604. [PMID: 38822602 DOI: 10.2166/wst.2024.132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Accepted: 04/15/2024] [Indexed: 06/03/2024]
Abstract
The number of published literature on the effect of ultrasonic cavitation and advanced oxidation pretreatment on the dewatering performance of anaerobically digested sludge is very limited. This study aims at determining the optimum operating conditions of large-scale filtering centrifuges in wastewater treatment plants. The optimum dose of hydrogen peroxide, ultrasonic power, ultrasonic duration, ultrasonic pulse and particle size distribution for improved dewatering performance were determined in this study. In addition, shear stress-shear rate and viscosity-shear rate rheograms were developed to show the rheological flow properties for varying ultrasonic power and treatment duration. Optimum sonication power, time, pulse and amplitude were determined to be 14 W, 1 min, 55/5 and 20%, respectively. At a pH of 6.8, the optimum concentration of hydrogen peroxide was found to be 43.5 g/L. The optimum hydrogen peroxide dose in the combined conditioning experiments was determined to be 500 mg/L at a pH of 3. Under these optimum conditions, capillary suction time was reduced significantly by 71.1%. This study helps to reduce polymer consumption and provides the optimum pretreatment and dewatering operating conditions, and better monitoring and control in the dewatering unit has significant impact in the overall economy of wastewater treatment plants.
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Affiliation(s)
- Tushar Kanti Sen
- Chemical Engineering Department, King Faisal University, P.O. Box 380, Al-Ahsa 31982, Saudi Arabia
| | - Anteneh Mesfin Yeneneh
- International Maritime College, National University of Science and Technology, P.O. Box 532, Sohar, Oman E-mail:
| | - Tahereh Jafary
- International Maritime College, National University of Science and Technology, P.O. Box 532, Sohar, Oman
| | - Khadija Al Balushi
- International Maritime College, National University of Science and Technology, P.O. Box 532, Sohar, Oman
| | - Eugene Hong
- Department of Chemical Engineering, Curtin University, P.O. Box U1987, Perth 6845, Australia
| | - Jimoh K Adewole
- International Maritime College, National University of Science and Technology, P.O. Box 532, Sohar, Oman
| | - Muna Hamed Al Hinai
- International Maritime College, National University of Science and Technology, P.O. Box 532, Sohar, Oman
| | - Sanjay Shinde
- Department of Chemical Engineering, Curtin University, P.O. Box U1987, Perth 6845, Australia
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2
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Yang Y, Yang X, Chen Y, Li X, Yang Q, Li Y, Ma P, Zhang H, Xu S. Response surface optimization of sludge dewatering process: synergistic enhancement by ultrasonic, chitosan and sludge-based biochar. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2024; 89:1630-1646. [PMID: 38619894 DOI: 10.2166/wst.2024.080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2023] [Accepted: 02/20/2024] [Indexed: 04/17/2024]
Abstract
Due to the colloidal stability, the high compressibility and the high hydration of extracellular polymeric substances (EPS), it is difficult to efficiently dehydrate sludge. In order to enhance sludge dewatering, the process of ultrasonic (US) cracking, chitosan (CTS) re-flocculation and sludge-based biochar (SBB) skeleton adsorption of water-holding substances to regulate sludge dewaterability was proposed. Based on the response surface method, the prediction model of the specific resistance to filtration (SRF) and sludge cake moisture content (MC) was established. The US cracking time and the dosage of CTS and SBB were optimized. The results showed that the optimal parameters of the three were 5.08 s, 10.1 mg/g dry solids (DS) and 0.477 g/g DS, respectively. Meantime, the SRF and MC were 5.4125 × 1011 m/kg and 76.8123%, which significantly improved the sludge dewaterability. According to the variance analysis, it is found that the fitting degree of SRF and MC model is good, which also confirms that there is significant interaction and synergy between US, CTS and SBB, and the contribution of CTS and SBB is greater. Moreover, the process significantly improves the sludge's calorific value and makes its combustion more durable.
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Affiliation(s)
- Yahong Yang
- School of Civil Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; Wenzhou Engineering Institute of Pump & Value, Lanzhou University of Technology, Wenzhou, Zhejiang 325105, China E-mail:
| | - Xingfeng Yang
- School of Civil Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; School of Environmental and Chemical Engineering, Organic Compound Pollution Control Engineering, Ministry of Education, Shanghai University, Shanghai 200444, China
| | - Yirong Chen
- School of Civil Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; Wenzhou Engineering Institute of Pump & Value, Lanzhou University of Technology, Wenzhou, Zhejiang 325105, China
| | - Xiaowei Li
- School of Environmental and Chemical Engineering, Organic Compound Pollution Control Engineering, Ministry of Education, Shanghai University, Shanghai 200444, China
| | - Qiyong Yang
- College of Resources & Environment, Jiujiang University, Jiujiang, Jiangxi 332005, China
| | - Yangying Li
- School of Civil Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; Wenzhou Engineering Institute of Pump & Value, Lanzhou University of Technology, Wenzhou, Zhejiang 325105, China
| | - Pengjing Ma
- School of Civil Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; Wenzhou Engineering Institute of Pump & Value, Lanzhou University of Technology, Wenzhou, Zhejiang 325105, China
| | - Huining Zhang
- School of Civil Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China
| | - Shenghui Xu
- School of Civil Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China
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3
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Banu JR, Kavitha S, Ravi YK, Tyagi VK, Kumar G. Combined sodium citrate and ultrasonic pretreatment of waste activated sludge for cost effective production of biogas. BIORESOURCE TECHNOLOGY 2023; 376:128857. [PMID: 36906239 DOI: 10.1016/j.biortech.2023.128857] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Revised: 03/04/2023] [Accepted: 03/07/2023] [Indexed: 06/18/2023]
Abstract
This study aimed to pretreat the waste activated sludge (WAS) by ultrasonication in an energy efficient way by combining sodium citrate with ultrasonic pretreatment at 0.03 g/g suspended solids (SS) of dosage. The ultrasonic pretreatment was done at various (20-200 W) power levels, sludge concentration (7 to 30 g/L), sodium citrate dosages (0.01 to 0.2 g/g SS). An elevated COD solubilization of 26.07 ± 0.6 % was achieved by combined pretreatment at a treatment time of 10 min, ultrasonic power level of 160 W when compared to individual ultrasonic pretreatment (18.6 ± 0.5 %). A higher biomethane yield of 0.26 ± 0.009 L/g COD was achieved in sodium citrate combined ultrasonic pretreatment (SCUP) than ultrasonic pretreatment (UP) 0.145 ± 0.006 L/g COD. Almost 50% of the energy can be saved through SCUP when compared to UP. Future study evaluating SCUP in continuous mode anaerobic digestion is vital.
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Affiliation(s)
- J Rajesh Banu
- Department of Biotechnology, Central University of Tamil Nadu, Neelakudi, Thiruvarur, Tamil Nadu 610005, India
| | - S Kavitha
- Environ Core Research Laboratory, Tamil Nadu, India
| | - Yukesh Kannah Ravi
- Department of Environmental and Sustainable Engineering, University at Albany, State University of New York, 1400 Washington Avenue, Albany, NY 12222, United States of America
| | - Vinay Kumar Tyagi
- Environmental Hydrology Division, National Institute of Hydrology, Roorkee, Uttarakhand 247667, India
| | - Gopalakrishnan Kumar
- School of Civil and Environmental Engineering, Yonsei University, Seoul 03722, Republic of Korea; Institute of Chemistry, Bioscience and Environmental Engineering, Faculty of Science and Technology, University of Stavanger, Stavanger 4036, Norway.
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4
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Parvulescu VI, Epron F, Garcia H, Granger P. Recent Progress and Prospects in Catalytic Water Treatment. Chem Rev 2021; 122:2981-3121. [PMID: 34874709 DOI: 10.1021/acs.chemrev.1c00527] [Citation(s) in RCA: 67] [Impact Index Per Article: 22.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Presently, conventional technologies in water treatment are not efficient enough to completely mineralize refractory water contaminants. In this context, the implementation of catalytic processes could be an alternative. Despite the advantages provided in terms of kinetics of transformation, selectivity, and energy saving, numerous attempts have not yet led to implementation at an industrial scale. This review examines investigations at different scales for which controversies and limitations must be solved to bridge the gap between fundamentals and practical developments. Particular attention has been paid to the development of solar-driven catalytic technologies and some other emerging processes, such as microwave assisted catalysis, plasma-catalytic processes, or biocatalytic remediation, taking into account their specific advantages and the drawbacks. Challenges for which a better understanding related to the complexity of the systems and the coexistence of various solid-liquid-gas interfaces have been identified.
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Affiliation(s)
- Vasile I Parvulescu
- Department of Organic Chemistry, Biochemistry and Catalysis, University of Bucharest, B-dul Regina Elisabeta 4-12, Bucharest 030016, Romania
| | - Florence Epron
- Université de Poitiers, CNRS UMR 7285, Institut de Chimie des Milieux et Matériaux de Poitiers (IC2MP), 4 rue Michel Brunet, TSA 51106, 86073 Poitiers Cedex 9, France
| | - Hermenegildo Garcia
- Instituto Universitario de Tecnología Química, Universitat Politecnica de Valencia-Consejo Superior de Investigaciones Científicas, Universitat Politencia de Valencia, Av. de los Naranjos s/n, 46022 Valencia, Spain
| | - Pascal Granger
- CNRS, Centrale Lille, Univ. Artois, UMR 8181 - UCCS - Unité de Catalyse et Chimie du Solide, Univ. Lille, F-59000 Lille, France
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5
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Lippert T, Bandelin J, Schlederer F, Drewes JE, Koch K. Effects of ultrasonic reactor design on sewage sludge disintegration. ULTRASONICS SONOCHEMISTRY 2020; 68:105223. [PMID: 32540730 DOI: 10.1016/j.ultsonch.2020.105223] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2020] [Revised: 06/04/2020] [Accepted: 06/06/2020] [Indexed: 06/11/2023]
Abstract
The impact of ultrasound (US) reactor design on cavitation intensity distribution and disintegration efficiency was studied for sewage sludge pre-treatment, using a US flatbed reactor of variable reaction chamber height (RCH, 20-100 mm). Mapping of cavitation intensity and treatment effects was conducted using (i) hydrophone measurements, (ii) aluminum foil tests, and (iii) soluble chemical oxygen demand (COD) analyses. The overall disintegration efficiency was evaluated based on average COD solubilization. The impact of flow on treatment (in)homogeneity was additionally examined using computational fluid dynamics (CFD). Results of all measurement techniques suggest that small RCHs (20 mm, for instance) enable uniform and intense treatments, while large RCHs, which are subjected to strong sound wave attenuation, entail inhomogeneous treatments where large fractions of substrate are no longer exposed to notable cavitation activity. For instance, COD solubilization (relative to alkaline hydrolysis) measured in the channel center dropped from 6.4% to zero as RCH widened from 20 mm to 100 mm. Flow-through sonication further aggravates treatment inhomogeneity due to the high flow rates in the low-cavitation channel centers. Overall disintegration efficiency declined with increasing RCH, showing a drop in average COD solubilization by 73% from RCH = 20 mm to RCH = 100 mm. The drop correlated with average cavitation noise levels (R2 = 0.82), indicating that hydrophone measurements may be a suitable tool for US reactor design optimization. Overall, results suggest that reactor geometry has a critical impact on both treatment (in)homogeneity and treatment efficiency and that equal specific energy inputs do not imply equal US treatments.
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Affiliation(s)
- Thomas Lippert
- Chair of Urban Water Systems Engineering, Technical University of Munich, Am Coulombwall 3, 85748 Garching, Germany
| | - Jochen Bandelin
- Chair of Urban Water Systems Engineering, Technical University of Munich, Am Coulombwall 3, 85748 Garching, Germany; BANDELIN Electronic GmbH & Co. KG, Heinrichstraße 3 - 4, 12207 Berlin, Germany
| | - Felizitas Schlederer
- Chair of Urban Water Systems Engineering, Technical University of Munich, Am Coulombwall 3, 85748 Garching, Germany
| | - Jörg E Drewes
- Chair of Urban Water Systems Engineering, Technical University of Munich, Am Coulombwall 3, 85748 Garching, Germany
| | - Konrad Koch
- Chair of Urban Water Systems Engineering, Technical University of Munich, Am Coulombwall 3, 85748 Garching, Germany.
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Xu J, Sun Y, Liu Y, Yuan W, Dai L, Xu W, Wang H. In-situ sludge settleability improvement and carbon reuse in SBR process coupled with hydrocyclone. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 695:133825. [PMID: 31756870 DOI: 10.1016/j.scitotenv.2019.133825] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Revised: 07/25/2019] [Accepted: 08/06/2019] [Indexed: 06/10/2023]
Abstract
The settleability performance of activated sludge (AS) is a very important indicator in the biological treatment of wastewater. In this paper, we investigated the influence of hydrocyclone treatment on sludge settleability and explored the influence mechanism by sorting the excess sludge (ES) with a hydrocyclone. A lateral-line test of the treatment process of the campus wastewater treatment plant (WWTP) at East China University of Science and Technology (ECUST) was carried out by using a sequencing batch reactor (SBR) AS process equipped with a hydrocyclone. The results showed that the sludge flocs rotate and revolve in the hydrocyclone; the resulting shear and centrifugal stress cause the flocs to crack into smaller pieces and can break the extracellular polymeric substances (EPS) on the floc surface, thus changing the floc structure and density. After density sorting by the hydrocyclone, the particle size of the sludge floc returned to the bioreactor decreased, the compactness increased, the settleability performance improved, the sludge volume index (SVI) decreased by 6.1%, and the effluent suspended solid (SS) concentration decreased by 6.1%. Meanwhile, the broken EPS caused organic carbon sources, such as polysaccharides and proteins, in the floc channels to be released into the water phase, supplementing the carbon source for denitrification and improving the effluent water quality: the removal rates of soluble chemical oxygen demand (SCOD), total nitrogen (TN), and NH4-N increased by 6.9%, 8.9%, and 8.4%, respectively.
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Affiliation(s)
- Jiaping Xu
- National Engineering Laboratory for Industrial Waste-water Treatment, East China University of Science and Technology, Shanghai 200237, PR China
| | - Yuxiao Sun
- National Engineering Laboratory for Industrial Waste-water Treatment, East China University of Science and Technology, Shanghai 200237, PR China
| | - Yi Liu
- National Engineering Laboratory for Industrial Waste-water Treatment, East China University of Science and Technology, Shanghai 200237, PR China.
| | - Wei Yuan
- National Engineering Laboratory for Industrial Waste-water Treatment, East China University of Science and Technology, Shanghai 200237, PR China
| | - Li Dai
- National Engineering Laboratory for Industrial Waste-water Treatment, East China University of Science and Technology, Shanghai 200237, PR China
| | - Weinan Xu
- National Engineering Laboratory for Industrial Waste-water Treatment, East China University of Science and Technology, Shanghai 200237, PR China
| | - Hualin Wang
- National Engineering Laboratory for Industrial Waste-water Treatment, East China University of Science and Technology, Shanghai 200237, PR China.
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7
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Wang W, Zhang J, Li X, Zang Y, Li R. Effects of typical modified passivators on speciation of heavy metals in protein extracted from sewage sludge. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:10875-10886. [PMID: 30778942 DOI: 10.1007/s11356-019-04393-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Accepted: 01/25/2019] [Indexed: 06/09/2023]
Abstract
The sewage sludge contains abundant organic substances as well as a complex variety of inorganic substances (such as heavy metals). The extraction of protein from sludge is a new treatment approach to promote the utilization of sludge as a resource. However, heavy metals in sludge are extracted together with organic matter during the extraction process. In this study, the amounts of protein and heavy metal in the supernatant extracted from sewage sludge were investigated, and the effects of different passivator (modified fly ash and modified sepiolite) on the speciation of different heavy metals in the sludge were examined. Both materials reduced the contents of protein and heavy metal in the supernatant. When the dosage of sepiolite was 0.10 g/g total suspended solids of sludge, the content of heavy metals was the lowest and the protein content had little change. It can be deduced by analysis of specific area that sepiolite can complex with heavy metal ions and the fly ash adsorb the metals by physical adsorption. The modified sepiolite can be seen as an ideal passivator due to higher protein content and less heavy metals in the supernatant, as well as more stable heavy metals in the sediments.
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Affiliation(s)
- Weiyun Wang
- Key Laboratory of Clean Energy of Liaoning, College of Energy and Environment, Shenyang Aerospace University, Shenyang, 110136, Liaoning, China.
| | - Jin Zhang
- Key Laboratory of Clean Energy of Liaoning, College of Energy and Environment, Shenyang Aerospace University, Shenyang, 110136, Liaoning, China
| | - Xueshen Li
- Key Laboratory of Clean Energy of Liaoning, College of Energy and Environment, Shenyang Aerospace University, Shenyang, 110136, Liaoning, China
| | - Ying Zang
- Key Laboratory of Clean Energy of Liaoning, College of Energy and Environment, Shenyang Aerospace University, Shenyang, 110136, Liaoning, China
| | - Rundong Li
- Key Laboratory of Clean Energy of Liaoning, College of Energy and Environment, Shenyang Aerospace University, Shenyang, 110136, Liaoning, China
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8
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Tytła M. The Effects of Ultrasonic Disintegration as a Function of Waste Activated Sludge Characteristics and Technical Conditions of Conducting the Process-Comprehensive Analysis. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2018; 15:ijerph15102311. [PMID: 30347832 PMCID: PMC6210070 DOI: 10.3390/ijerph15102311] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Revised: 10/10/2018] [Accepted: 10/18/2018] [Indexed: 11/29/2022]
Abstract
A comprehensive analysis of the effects obtained in the process of ultrasonic disintegration (UD) of waste activated sludge (WAS), was conducted. Sludge samples were collected periodically from Central Wastewater Treatment Plant (WWTP) in Gliwice (Poland) and disintegrated in the two ultrasonic devices of different construction and technical parameters, i.e., WK-2010 (A) and ultrasonic washer (B). The experiments were performed under a constant energy supply per sludge volume EV = 160 kWh·m−3. The direct and technological effects, i.e., after UD and anaerobic digestion (AD) were investigated, respectively. Statistical analysis showed that characteristics and parameters of the WAS, which affects the magnitude of the direct effects create the following sequence: TS (total solids), VS (volatile solids), ΔT (temperature increase) > EPS (extracellular polymeric substances) > SCOD (soluble chemical oxygen demand) > CST (capillary suction time) > NTOT (total nitrogen), PTOT (total phosphorus) > pH. Whereas, in the case of technological effects, the above sequence was as follows: TS, VS > CST > NTOT, PTOT > pH. Ultrasonic disintegration of WAS prior to AD increased total biogas production (from 13.0% to 19.7%) and reduced the content of TS (from 4.1% to 8.2%) and VS (5.8% to 9.5%) in comparison to the control sample. This confirms the usefulness of ultrasonic disintegration as an effective method of sludge digestion intensification. The obtained results showed that changes in the characteristics of WAS have a significant impact on the magnitude of the effects of ultrasonic disintegration, especially TS, VS, ΔT, EPS, SCOD and CST. Concluding, it can be inferred that the most promising conditions for ultrasonic pretreatment conducted under constant energy supply per sludge volume, are: low power, long sonication time, large surface area of the emitter, and high increase of sludge temperature while conducting the process.
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Affiliation(s)
- Malwina Tytła
- Institute of Environmental Engineering, Polish Academy of Sciences, 34 M. Skłodowskiej-Curie St., 41-819 Zabrze, Poland.
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Xu Y, Fang Y, Wang Z, Guo D, Liu Y, Huang Y, Fu P, Jin J, Wei C, Wang H, Zeng T. In-situ sludge reduction and carbon reuse in an anoxic/oxic process coupled with hydrocyclone breakage. WATER RESEARCH 2018; 141:135-144. [PMID: 29783166 DOI: 10.1016/j.watres.2018.05.010] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2018] [Revised: 04/29/2018] [Accepted: 05/08/2018] [Indexed: 06/08/2023]
Abstract
The long-term performance of an anoxic-oxic-hydrocyclone (AOH) process with an in-situ hydrocyclone treatment unit in the mixed liquid return line for sludge reduction and carbon reuse has been observed, in comparison with a conventional anoxic-oxic (AO) process. Three parallel side-stream systems, including one AOH25 system with a 25-mm hydrocyclone, one AOH35 system with a 35-mm hydrocyclone and one AO system, were built and fed with real wastewater for a comparative study in a wastewater treatment plant. The results demonstrate that the hydrocyclone in the AOH process was able to break macro-flocs into smaller flocs. And the desorption of the extracellular polymeric substance from return activated sludge (AS) leaded to an average increase of 62.97% and 36.36% in SCOD in the AOH25 and AOH35 system, respectively. In addition, shear forces, centrifugal forces of revolution and flocs' rotation in the hydrocyclone were proposed to be the main influence mechanism of hydrocyclone treatment on AS properties. Compared with the AO process, the SCOD concentration in the effluent of the AOH processes presented a decrease of 12.0 mg/L and the TN was reduced by 21.50% owing to the released carbon sources reuse. Moreover, the sludge production was reduced by 36.81% and 35.92% in the AOH25 and AOH35 process, respectively. By contrast, the AOH25 system was better than the AOH35 system.
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Affiliation(s)
- Yinxiang Xu
- National Engineering Laboratory for Industrial Wastewater Treatment, East China University of Science and Technology, Shanghai, 200237, PR China; Sichuan Engineering Laboratory of Resource Utilization of Mine Tailings, Sichuan University of Science & Engineering, Sichuan, 643000, PR China; School of Space and Environment, Beijing University of Aeronautics and Astronautics, Beijing, 100191, PR China
| | - Yuanyuan Fang
- National Engineering Laboratory for Industrial Wastewater Treatment, East China University of Science and Technology, Shanghai, 200237, PR China
| | - Zhenhua Wang
- National Engineering Laboratory for Industrial Wastewater Treatment, East China University of Science and Technology, Shanghai, 200237, PR China
| | - Dan Guo
- National Engineering Laboratory for Industrial Wastewater Treatment, East China University of Science and Technology, Shanghai, 200237, PR China
| | - Yi Liu
- National Engineering Laboratory for Industrial Wastewater Treatment, East China University of Science and Technology, Shanghai, 200237, PR China
| | - Yuan Huang
- National Engineering Laboratory for Industrial Wastewater Treatment, East China University of Science and Technology, Shanghai, 200237, PR China
| | - Pengbo Fu
- National Engineering Laboratory for Industrial Wastewater Treatment, East China University of Science and Technology, Shanghai, 200237, PR China
| | - Juehui Jin
- National Engineering Laboratory for Industrial Wastewater Treatment, East China University of Science and Technology, Shanghai, 200237, PR China
| | - Chenwen Wei
- National Engineering Laboratory for Industrial Wastewater Treatment, East China University of Science and Technology, Shanghai, 200237, PR China
| | - Hualin Wang
- National Engineering Laboratory for Industrial Wastewater Treatment, East China University of Science and Technology, Shanghai, 200237, PR China.
| | - Tao Zeng
- Sichuan Engineering Laboratory of Resource Utilization of Mine Tailings, Sichuan University of Science & Engineering, Sichuan, 643000, PR China
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10
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Lippert T, Bandelin J, Musch A, Drewes JE, Koch K. Energy-positive sewage sludge pre-treatment with a novel ultrasonic flatbed reactor at low energy input. BIORESOURCE TECHNOLOGY 2018; 264:298-305. [PMID: 29857284 DOI: 10.1016/j.biortech.2018.05.073] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2018] [Revised: 05/17/2018] [Accepted: 05/18/2018] [Indexed: 06/08/2023]
Abstract
The performance of a novel ultrasonic flatbed reactor for sewage sludge pre-treatment was assessed for three different waste activated sludges. The study systematically investigated the impact of specific energy input (200 - 3,000 kJ/kgTS) on the degree of disintegration (DDCOD, i.e. ratio between ultrasonically and maximum chemically solubilized COD) and methane production enhancement. Relationship between DDCOD and energy input was linear, for all sludges tested. Methane yields were significantly increased for both low (200 kJ/kgTS) and high (2,000 - 3,000 kJ/kgTS) energy inputs, while intermediate inputs (400 - 1,000 kJ/kgTS) showed no significant improvement. High inputs additionally accelerated reaction kinetics, but were limited to similar gains as low inputs (max. 12%), despite the considerably higher DDCOD values. Energy balance was only positive for 200 kJ/kgTS-treatments, with a maximum energy recovery of 122%. Results suggest that floc deagglomeration rather than cell lysis (DDCOD=1% - 5% at 200 kJ/kgTS) is the key principle of energy-positive sludge sonication.
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Affiliation(s)
- Thomas Lippert
- Chair of Urban Water Systems Engineering, Technical University of Munich, Am Coulombwall 3, 85748 Garching, Germany
| | - Jochen Bandelin
- Chair of Urban Water Systems Engineering, Technical University of Munich, Am Coulombwall 3, 85748 Garching, Germany
| | - Alexandra Musch
- Chair of Urban Water Systems Engineering, Technical University of Munich, Am Coulombwall 3, 85748 Garching, Germany
| | - Jörg E Drewes
- Chair of Urban Water Systems Engineering, Technical University of Munich, Am Coulombwall 3, 85748 Garching, Germany
| | - Konrad Koch
- Chair of Urban Water Systems Engineering, Technical University of Munich, Am Coulombwall 3, 85748 Garching, Germany.
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11
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Skórkowski Ł, Zielewicz E. The influence of energy input on the particle size of disintegrated excess sludge in the ultrasonic disintegration process. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2018; 2017:679-685. [PMID: 30016285 DOI: 10.2166/wst.2018.236] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The objective of this research was to examine the influence of energy input on the particle size distribution of disintegrated sludge. The change of particle size distribution indicates the deagglomeration of flocs and disruption of micro-colonies. As the digestibility of sludge increases with dispersion, particle size analysis is an important factor in evaluating the disintegration process. Four different levels of energy input were used in the research: 10-100 kWh·m-3. All samples showed significant changes as far as dispersion (kdCST = 22.98-74.67, kdFCOD = 3.23-18.46), lysis (kdSCOD = 4.22-12.09), acidification (kdVFAs = 1.78-12.61), nitrogen release (kdTN = 4.02-21.61) indicators were concerned. Results indicate the gradual decrease of measured particle size with increasing energy input. The energy supplied to the disintegration process primarily promotes deagglomeration and with the rise of energy input, the destruction of cells. For EV = 50 and 100 kWh·m-3 an increased occurrence of lysis effects and increase in particle fraction <99.9 μm was noted. The highest efficiency evaluated by increase of filtered chemical oxygen demand (FCOD) and soluble COD (SCOD) per unit of volumetric energy - ΔCOD and ΔSCOD (mgO2·Wh-1) was obtained for Ev = 10 WhL-1, which corresponds to the most significant change in particle size distribution. The volume of particles <99.9 μm rose from 1.92% for non-disintegrated sludge to 26.62% for volumetric energy 100 kWh·m-3.
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Affiliation(s)
- Łukasz Skórkowski
- Institute of Water and Wastewater Engineering, Silesian University of Technology, Konarskiego18A, 44-100 Gliwice, Poland E-mail:
| | - Ewa Zielewicz
- Institute of Water and Wastewater Engineering, Silesian University of Technology, Konarskiego18A, 44-100 Gliwice, Poland E-mail:
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Assessment of Excess Sludge Ultrasonic, Mechanical and Hybrid Pretreatment in Relation to the Energy Parameters. WATER 2018. [DOI: 10.3390/w10050551] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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