Environmental Sanitation Engineering ›› 2025, Vol. 33 ›› Issue (3): 49-55.doi: 10.19841/j.cnki.hjwsgc.2025.03.006

Previous Articles     Next Articles

Analysis of the Operation Safety and Economic Efficiency of Oil Extraction for Anaerobic Resource Utilization of Household Kitchen Waste

ZHANG Xiaoxing, WANG Wei, ZHANG Xianhua   

  1. 1. Shanghai Kepin Renewable Energy Co. Ltd.; 2. Shanghai Yuexin Environmental Protection Technology Co. Ltd.
  • Online:2025-07-01 Published:2025-07-01

PDF (PC)

13

PDF (Mobile)

0

Abstract: Wet waste includes restaurant food waste and household kitchen waste. The existing wet waste anaerobic resource treatment project has an oil extraction process for restaurant food waste, but not for household kitchen waste. Based on a wet waste anaerobic resource utilization project in Shanghai, the impact of engineering operations safety before and after setting up oil extraction processes for household kitchen waste were analyzed, including the operational safety of anaerobic biological systems (which could be reflected by observing the changes in volatile fatty acids, alkalinity and the oil content of the biogas liquid), and operation safety of aerobic biological treatment system for biogas slurry (which could be reflected by the changes in dissolved oxygen). Analysis showed that the oil content in kitchen waste slurry was approximately 1.5%-3.0%,which was necessary to add an oil extraction process, otherwise, it would lead to an increase in volatile fatty acids and a decrease in alkalinity in the anaerobic system, making the system unsafe. The high oil content in the biogas slurry seriously affected the oxygenation effect of the sewage treatment system, and the dissolved oxygen in MBR system nitrification tank was below 0.5 mg/L, resulting in poor treatment efficiency and even the possibility of the biological system collapsing. The economic analysis indicated that the unit price of crude oil (based on waste) ranged from 4 000 to 8 000 yuan per ton. Considering both the income from crude oil and the operating costs, the revenue per ton of waste was 37.20-94.20 yuan. The methane production rate increased by approximately 12%. The frequency of ultrafiltration membrane contamination in the biogas liquid MBR treatment system decreased by approximately 40%. The research could provide references for the engineering design and operation of new or renovated projects of this type.

Key words: household kitchen waste, resource utilization, oil extraction, anaerobic digestion, biogas slurry treatment, operational safety, economic analysis

[1] XIA Qing, XU Xiaojian, ZHANG Yuting, ZHOU Chengya, LIU Haichun. Occurrence Characteristic and Risk Assessment of Heavy Metals in Yangzhou Household Food Waste [J]. Environmental Sanitation Engineering, 2025, 33(2): 50-54.
[2] PAN Jiayu, LI Mei, LI Yang. Enhancing Anaerobic Methanogenesis of Urban Organic Solid Waste by Granular Activated Carbon-supplemented Electrodes Coupled with Intermittent Power Supply [J]. Environmental Sanitation Engineering, 2025, 33(2): 42-49,54.
[3] XU Jiahui, LIU Chao, LE Liangliang, SU Xing, CHEN Weihua, WU Jian. Application Study of Gas-liquid Jet Stirring Technology in Anaerobic Digestion Engineering of Kitchen Waste [J]. Environmental Sanitation Engineering, 2025, 33(1): 78-84.
[4] GU Yingjie, NIU Huanhuan. Analysis on Current Situation and Countermeasure of Resource Utilization of Kitchen Waste Oil in Shanghai Under the Background of“Dual Carbon” [J]. Environmental Sanitation Engineering, 2025, 33(1): 124-129.
[5] QI Jianan, ZHOU Shuo, NING Qing, WANG Huan, LI Bing, LIU Haiwei. Technical-economic Analysis of SRF Preparation Processes from Municipal Solid Waste in County Area of China [J]. Environmental Sanitation Engineering, 2025, 33(1): 23-31.
[6] ZUO Zhuang, ZHANG Chenyue, YU Wu, MIN Jiadong, WANG Yuanyue. Cross Flow Filtration Performance of Disk Ceramic Membrane from Different Sludge [J]. Environmental Sanitation Engineering, 2025, 33(1): 32-39.
[7] CI Hanlin, FANG Ning, GUO Yali, HUANG Jialiang, MEI Xiaojie, CHEN Fang, LI Jing. Selection of City Multi-source Organic Solid Waste Disposal Methods Based on Life-cycle Carbon Emission and Economic Cost Analysis [J]. Environmental Sanitation Engineering, 2024, 32(6): 1-9.
[8] WU Haijun, SHEN Feng, LI Wanjin, ZHANG Zelin, CAO Jian, LI Jingruo. Study on the Physical-chemical Properties and Unconfined Compressive Strength of Aged Garbage Humus [J]. Environmental Sanitation Engineering, 2024, 32(6): 28-35.
[9] HE Haie, ZHOU Jing, DONG Shiyang, ZHU Yifei, HAN Siyu, DAI Shijin. Analysis on Present Situation and Management Countermeasures of Packaging Waste in Typical Industrial Sectors [J]. Environmental Sanitation Engineering, 2024, 32(6): 104-110.
[10] WANG Lei , LIU Yuanjie, CHEN Dan. Techno-economic Analysis of Anaerobic Biogas Resource Utilization of Wet Waste [J]. Environmental Sanitation Engineering, 2024, 32(5): 55-61.
[11] ZHANG Li, LI Ke, ZHU Yaping, WU Yuan, YANG Hujun. Preparation of Carbon Source by Food Waste Dish Separation and Its Application [J]. Environmental Sanitation Engineering, 2024, 32(5): 62-66.
[12] PENG Dai, DENG Jinhuan, NING Xun’an, CHEN Jiayi, YE Wensheng, ZHANG Dingyuan. Recovery of Iron Resources by Synergistic Magnetization Roasting of Municipal Sludge and Iron Tailings [J]. Environmental Sanitation Engineering, 2024, 32(4): 17-22.
[13] ZHOU Yongquan, LI Xiaowei, TAI Jun. The Effects of Low-dosage Paper Addition on Co-Digestion of Food Waste and Kitchen Waste [J]. Environmental Sanitation Engineering, 2024, 32(4): 36-43.
[14] XIANG Xianchao, CAI Jiarui, ZHEN Zong’ao, LI Xiaodong. Status Quo of Mining and Resource Utilization of Mineralized Waste in Landfill [J]. Environmental Sanitation Engineering, 2024, 32(3): 16-27.
[15] OUYANG Chuang, ZHANG Yurong, TAI Jun, XU Xianbao, XUE Gang, LI Xiang. Comparative Study on Anaerobic Digestion of Food Waste Enhanced by Biogas Residue Hydrochar and Biogas Residue Pyrochar [J]. Environmental Sanitation Engineering, 2024, 32(3): 47-53.
Viewed
Full text


Abstract

Cited
  Shared   
  Discussed   
No Suggested Reading articles found!
Copyright © Environmental Sanitation Engineering
Address: 107#, Weidi Road, Tianjin, P.R.C.　 　 Postcode: 300201
Telephone: 022-28365069 　 Fax: 022-28365080 E-mail: csglwyjs10@tj.gov.cn
Supported by:Beijing Magtech