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Shi H, Li X, Yang S, Zhao R, Yuan X. Analysis of Chemical Oxygen Demand in Barrel Finishing Based on Reusing Water Resource of Grinding Fluid. MATERIALS (BASEL, SWITZERLAND) 2024; 17:4051. [PMID: 39203229 PMCID: PMC11356664 DOI: 10.3390/ma17164051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/09/2024] [Revised: 08/04/2024] [Accepted: 08/13/2024] [Indexed: 09/03/2024]
Abstract
To explore the sustainable development of grinding fluid in barrel finishing, the idea of water resource reuse in grinding fluid has been proposed. The influence of the graphene oxide (GO) and the sodium dodecyl benzene sulfonate (SDBS) as main components in the grinding fluid on the chemical oxygen demand (COD) was analyzed. Repreparing new grinding fluids by utilizing the water resources in grinding fluid after finishing will not cause a sharp increase in COD value. GO which absorbs SDBS can be taken away from grinding fluid by physical separation. It will decrease the COD value of grinding fluid. However, SDBS exists in the form of colloids in the grinding fluid and cannot be removed through physical separation, which also affects the COD value. Based on water quality indicators (the COD, pH, total hardness, metal aluminum, anionic surfactants, and total dissolved solids), the water quality index (WQI) of the reusing grinding fluid after finishing by the physical separation is significantly reduced. It indicates that reusing water resources in grinding fluid is a feasible way to reuse grinding fluid.
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Affiliation(s)
- Huiting Shi
- School of Mechanical Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China; (R.Z.); (X.Y.)
| | - Xuenan Li
- College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China; (X.L.); (S.Y.)
- Shanxi Province Key Laboratory of Precise Machining, Taiyuan 030024, China
| | - Shengqiang Yang
- College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China; (X.L.); (S.Y.)
- Shanxi Province Key Laboratory of Precise Machining, Taiyuan 030024, China
| | - Ruihao Zhao
- School of Mechanical Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China; (R.Z.); (X.Y.)
| | - Xiang Yuan
- School of Mechanical Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China; (R.Z.); (X.Y.)
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Wang W, Qi L, Zhang J. Specific resistance and adsorption performance of acid-modified fly ash for escaped ammonia in flue gas. JOURNAL OF HAZARDOUS MATERIALS 2024; 465:133072. [PMID: 38011825 DOI: 10.1016/j.jhazmat.2023.133072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Revised: 11/03/2023] [Accepted: 11/21/2023] [Indexed: 11/29/2023]
Abstract
Escaped ammonia emission following Selective Catalytic Reduction denitrification significantly influences subsequent flue gas treatment processes. This study investigates the adsorption capabilities of acid-modified fly ash concerning escaped ammonia (NH3) and its consequential impact on specific resistance. Furthermore, the adsorption mechanism of acid-modified fly ash on NH3 was explained. Acid activation facilitated the dissolution of a portion of Fe and Al constituents within the fly ash, the contents of Fe and Al in SFA decrease by 4.91% and 5.64%, respectively. In addition, the specific surface area and porosity of fly ash are obviously improved. The specific surface areas of HFA and SFA increased from 1.83 (OFA) to 4.69 and 7.71 m2/g, respectively. Adsorption kinetics adhered to the pseudo-first-order model. SFA showed the best adsorption performance, with NH3 adsorption up to 10.65 mg/g, which was 4.27 times higher than OFA. The creation of a surface liquid film during NH3 adsorption led to decreased specific resistance values across all fly ash samples after-adsorption. The highest specific resistance values recorded for original fly ash (OFA), hydrochloric acid-modified fly ash (HFA) and sulfuric acid-modified fly ash (SFA) were 6.21 × 1012, 3.37 × 1011 and 5.02 × 1010 Ω·cm, respectively. Sulfuric acid activation makes fly ash have stronger adsorption capacity for escaping ammonia, and SFA maintains good specific resistance characteristics, which has good application prospects in electrostatic precipitation and air pollution control.
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Affiliation(s)
- Wen Wang
- Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, China
| | - Liqiang Qi
- Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, China.
| | - Jiahao Zhang
- Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, China
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Chen Y, Chen R, Chang X, Yan J, Gu Y, Xi S, Sun P, Dong X. Degradation of Sodium Acetate by Catalytic Ozonation Coupled with a Mn-Functionalized Fly Ash: Reaction Parameters and Mechanism. TOXICS 2023; 11:700. [PMID: 37624205 PMCID: PMC10457793 DOI: 10.3390/toxics11080700] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2023] [Revised: 08/04/2023] [Accepted: 08/09/2023] [Indexed: 08/26/2023]
Abstract
Supported ozone catalysts usually take alumina, activated carbon, mesoporous molecular sieve, graphene, etc. as the carrier for loading metal oxide via the impregnation method, sol-gel method and precipitation method. In this work, a Mn-modified fly ash catalyst was synthesized to reduce the consumption and high unit price of traditional catalyst carriers like alumina. As a solid waste discharged from coal-fired power plants fueled by coal, fly ash also has porous spherical fine particles with constant surface area and activity, abd is expected to be applied as the main component in the synthesis of ozone catalyst. After the pretreatment process and modification with MnOx, the obtained Mn-modified fly ash exhibited stronger specific surface area and porosity combined with considerable ozone catalytic performance. We used sodium acetate as the contaminant probe, which is difficult to directly decompose with ozone as the end product of ozone oxidation, to evaluate the performance of this Mn-modified fly. It was found that ozone molecules can be transformed to generate ·OH, ·O2- and 1O2 for the further oxidation of sodium acetate. The oxygen vacancy produced via Mn modification plays a crucial role in the adsorption and excitation of ozone. This work demonstrates that fly ash, as an industrial waste, can be synthesized as a potential industrial catalyst with stable physical and chemical properties, a simple preparation method and low costs.
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Affiliation(s)
- Yaoji Chen
- Zhejiang Tiandi Environmental Protection Technology Co., Ltd., 2159-1 Yuhangtang Road, Hangzhou 311199, China; (Y.C.)
| | - Ruifu Chen
- Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, School of Chemistry and Chemical Engineering, Zhejiang Sci-Tech University, 928 Second Avenue, Xiasha Higher Education Zone, Hangzhou 310018, China
| | - Xinglan Chang
- Zhejiang Tiandi Environmental Protection Technology Co., Ltd., 2159-1 Yuhangtang Road, Hangzhou 311199, China; (Y.C.)
| | - Jingying Yan
- Zhejiang Tiandi Environmental Protection Technology Co., Ltd., 2159-1 Yuhangtang Road, Hangzhou 311199, China; (Y.C.)
| | - Yajie Gu
- Zhejiang Tiandi Environmental Protection Technology Co., Ltd., 2159-1 Yuhangtang Road, Hangzhou 311199, China; (Y.C.)
| | - Shuang Xi
- Zhejiang Tiandi Environmental Protection Technology Co., Ltd., 2159-1 Yuhangtang Road, Hangzhou 311199, China; (Y.C.)
| | - Pengfei Sun
- Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, School of Chemistry and Chemical Engineering, Zhejiang Sci-Tech University, 928 Second Avenue, Xiasha Higher Education Zone, Hangzhou 310018, China
| | - Xiaoping Dong
- Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, School of Chemistry and Chemical Engineering, Zhejiang Sci-Tech University, 928 Second Avenue, Xiasha Higher Education Zone, Hangzhou 310018, China
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Qi L, Luo J, Wang W, Zhao W. Adsorption of SO2 from sintering flue gas by alkali modified fly ash in electrostatic precipitator. SEP SCI TECHNOL 2023. [DOI: 10.1080/01496395.2023.2180392] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
Affiliation(s)
- Liqiang Qi
- Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding, P. R. China
| | - Jichen Luo
- Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding, P. R. China
| | - Wen Wang
- Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding, P. R. China
| | - Weiyuan Zhao
- Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding, P. R. China
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Lingamurthy DB, Hiregoudar S, Nidoni U, Ganachari SV, Patil VB, Hiremath V. Adsorptive removal of organic pollutants from milk-processing industry effluents through chitosan-titanium dioxide nanoadsorbent-coated sand. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:24101-24119. [PMID: 36333637 DOI: 10.1007/s11356-022-23854-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2022] [Accepted: 10/23/2022] [Indexed: 06/16/2023]
Abstract
Milk-processing industry effluent (MPIE) poses severe problems for aquatic and environmental systems, especially in the South Asian region. Therefore, its treatment is of great interest. This study deals with the investigation of chitosan titanium dioxide nanoadsorbent (CTiO2) coated onto sand particles via calcination that are used to remove the emerging pollutants. The adsorptive properties of these developed adsorbents are compared with those of the nascent sand without coating as well as with the chitosan titanium dioxide nanoadsorbent coated sand (CTiO2-CS). Batch adsorption experiments were performed to investigate the percent reduction efficiency (%RE) of organic pollutants in terms of biological oxygen demand (BOD) and chemical oxygen demand (COD) from synthetic and real effluents. The maximum %RE of BOD (96.76) and COD (98.91) was achieved at 1.5 M dose of CTiO2-CS, 120 min of contact time, pH 6.5, an initial BOD concentration of 900 mg/L, and an agitation speed of 400 rpm. Similarly, the %RE of COD was found to be 86.75 for synthetic effluent and 90.97 for real effluent at initial COD concentrations of 8000 mg/L. Pseudo-second-order and Langmuir models are found to be the best fits for BOD and COD adsorption. The diffusion model suggests that surface adsorption as well as intraparticle diffusion contribute to the actual adsorption process. Regeneration experiments were performed for four cycles, and CTiO2-CS was found to be the most regenerable adsorbent material. The performance of the adsorbent was compared with previous studies, and it was found to have excellent adsorption capacity. As a result, the developed filter bed could be used as a promising superadsorbent for the removal of organic load in MPIE.
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Affiliation(s)
| | - Sharanagouda Hiregoudar
- Centre for Nanotechnology, College of Agricultural Engineering, University of Agricultural Sciences, Raichur, 584 104, India
| | - Udaykumar Nidoni
- Department of Processing and Food Engineering, College of Agricultural Engineering, University of Agricultural Sciences, Raichur, 584 104, India
| | - Sharanabasava V Ganachari
- Department of Chemistry, School of Advanced Sciences, KLE Technological University, Hubballi, 580031, India.
| | - Veerabhadragouda B Patil
- Institute of Energetic Materials, Faculty of Chemical Technology, University of Pardubice, 53210, Pardubice, Czech Republic
| | - Vijayakumar Hiremath
- Centre for Nanotechnology, College of Agricultural Engineering, University of Agricultural Sciences, Raichur, 584 104, India
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Zhang H, Gan S, Sun H, Yang H, Xie S. Fly‐Ash‐Based Hierarchical MCM‐41 Molecular Sieve as an Efficient Adsorbent for Methylene Blue Removal from Wastewater over a Wide pH. ChemistrySelect 2022. [DOI: 10.1002/slct.202203213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Huabing Zhang
- School of Biology and Chemical Engineering Panzhihua University No. 10 Airport Road, East District Panzhihua Sichuan Province 617000 People's Republic of China
| | - Simeng Gan
- School of Biology and Chemical Engineering Panzhihua University No. 10 Airport Road, East District Panzhihua Sichuan Province 617000 People's Republic of China
| | - Houxiang Sun
- School of Biology and Chemical Engineering Panzhihua University No. 10 Airport Road, East District Panzhihua Sichuan Province 617000 People's Republic of China
| | - Haiyan Yang
- School of Biology and Chemical Engineering Panzhihua University No. 10 Airport Road, East District Panzhihua Sichuan Province 617000 People's Republic of China
| | - Sicai Xie
- School of Biology and Chemical Engineering Panzhihua University No. 10 Airport Road, East District Panzhihua Sichuan Province 617000 People's Republic of China
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