Modified corn-core powder for enhancing sludge dewaterability: Synthesis, characterization and sludge dewatering performance

doi:10.1016/j.cjche.2020.09.022

Chinese Journal of Chemical Engineering ›› 2021, Vol. 32 ›› Issue (4): 368-377.DOI: 10.1016/j.cjche.2020.09.022

• Energy, Resources and Environmental Technology • Previous Articles Next Articles

Modified corn-core powder for enhancing sludge dewaterability: Synthesis, characterization and sludge dewatering performance

Zhiying Guo¹, Liping Ma¹, Quxiu Dai¹, Xinbo Yang², Ran Ao¹, Jie Yang³, Jing Yang⁴, Wengang Li¹

1 Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China;
2 Yunnan Tianlang Energy Saving&Environmental Protection Group Co. Ltd, Kunming 650300, China;
3 College of Resources and Environment, Chengdu University of Information Technology, Chengdu 610225, China;
4 School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710000, China

Received:2020-01-29 Revised:2020-09-03 Online:2021-06-19 Published:2021-04-28
Contact: Liping Ma
Supported by:
This work was supported by the National Natural Science Foundation of China (No. 21666016); the National Key R&D Program of China (2018YFC1900200); and the Key Laboratory and the Analysis and Testing Foundation of Kunming University of Science and Technology (2017M20162207011, 2019P20183107007).

Modified corn-core powder for enhancing sludge dewaterability: Synthesis, characterization and sludge dewatering performance

Zhiying Guo¹, Liping Ma¹, Quxiu Dai¹, Xinbo Yang², Ran Ao¹, Jie Yang³, Jing Yang⁴, Wengang Li¹

1 Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China;
2 Yunnan Tianlang Energy Saving&Environmental Protection Group Co. Ltd, Kunming 650300, China;
3 College of Resources and Environment, Chengdu University of Information Technology, Chengdu 610225, China;
4 School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710000, China

通讯作者: Liping Ma
基金资助:
This work was supported by the National Natural Science Foundation of China (No. 21666016); the National Key R&D Program of China (2018YFC1900200); and the Key Laboratory and the Analysis and Testing Foundation of Kunming University of Science and Technology (2017M20162207011, 2019P20183107007).

Abstract

Abstract: The high water content of sludge has always posed significant challenges for its treatment. Synthetic flocculants, which are widely used in sewage treatment plants, can cause secondary pollution during their production and use. Thus, natural polymer flocculants made of natural materials have received increased research attention recently. Corn-core, an agricultural waste, was modified through alkalization with sodium hydroxide (NaOH) and etherification with cetyltrimethylammonium bromide (CTMAB) in this study. The L₁₆ (4⁵) orthogonal array was used to study the modification conditions. The moisture content (MC) of treated sludge was reduced by approximately 37% with the addition of modified corn-core powder (MCCP), which was synthesized under optimal conditions. In addition, changes in the functional groups of the material before and after modification were determined by FT-IR. Thermogravimetric analysis indicated that MCCP was steady at room temperature, moreover, BET analysis showed that MCCP had greater surface area. The microstructures of material before and after modification were examined by scanning electron microscopy, revealing that MCCP had a flake-shaped structure and had an increased area of contact area with sludge particles. MCCP is a dehydrating agent that can enhance sludge dewaterability through charge neutralization and re-agglomeration and provide superior economic benefits.

Key words: Municipal sludge, Corn-core powder, Pollution, Polymers, Waste treatment

摘要： The high water content of sludge has always posed significant challenges for its treatment. Synthetic flocculants, which are widely used in sewage treatment plants, can cause secondary pollution during their production and use. Thus, natural polymer flocculants made of natural materials have received increased research attention recently. Corn-core, an agricultural waste, was modified through alkalization with sodium hydroxide (NaOH) and etherification with cetyltrimethylammonium bromide (CTMAB) in this study. The L₁₆ (4⁵) orthogonal array was used to study the modification conditions. The moisture content (MC) of treated sludge was reduced by approximately 37% with the addition of modified corn-core powder (MCCP), which was synthesized under optimal conditions. In addition, changes in the functional groups of the material before and after modification were determined by FT-IR. Thermogravimetric analysis indicated that MCCP was steady at room temperature, moreover, BET analysis showed that MCCP had greater surface area. The microstructures of material before and after modification were examined by scanning electron microscopy, revealing that MCCP had a flake-shaped structure and had an increased area of contact area with sludge particles. MCCP is a dehydrating agent that can enhance sludge dewaterability through charge neutralization and re-agglomeration and provide superior economic benefits.

关键词: Municipal sludge, Corn-core powder, Pollution, Polymers, Waste treatment

Zhiying Guo, Liping Ma, Quxiu Dai, Xinbo Yang, Ran Ao, Jie Yang, Jing Yang, Wengang Li. Modified corn-core powder for enhancing sludge dewaterability: Synthesis, characterization and sludge dewatering performance[J]. Chinese Journal of Chemical Engineering, 2021, 32(4): 368-377.

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Modified corn-core powder for enhancing sludge dewaterability: Synthesis, characterization and sludge dewatering performance

Modified corn-core powder for enhancing sludge dewaterability: Synthesis, characterization and sludge dewatering performance

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