Environmental Sanitation Engineering ›› 2024, Vol. 32 ›› Issue (5): 41-47.doi: 10.19841/j.cnki.hjwsgc.2024.05.007

Previous Articles     Next Articles

Effects of Different Feedstock Ratios on the Physicochemical Properties and Maturity of Co-composting of Digestate and Kitchen Waste

WANG Feng, SUN Jinhao, LIU Wenjun, CHEN Weihua, TIAN Hongyi, CHUI Chunmeng, XIE Bing   

  1. 1. Shanghai Engineering Research Center of Biotransformation on Organic Solid Waste, School of Ecological and Environmental Sciences, East China Normal University; 2. Shanghai Liming Resources Reuse Co. Ltd.
  • Online:2024-11-01 Published:2024-11-01

PDF (PC)

80

PDF (Mobile)

3

Abstract: Aerobic composting is an effective way for resource utilization of digestate and kitchen waste. Co-composting of digestate and kitchen waste can effectively improve the physicochemical properties of the compost pile and thus increase the composting efficiency, but the compounding ratio of the two co-composts still needs to be explored. In this study, five treatment groups were set up for co-composting with the mass ratio of digestate to kitchen waste of 10.0∶0, 7.5∶2.5, 5.0∶5.0, 2.5∶7.5, and 0∶10.0. The physicochemical indexes in the composting process as well as the degree of humification of the final product were used as the evaluation indexes in order to determine the optimal ratio of co-composting of kitchen waste to digestate, which could provide a reference for the improvement of the efficiency of the joint resource utilization of digestate and kitchen waste. The results showed that when the mass ratio of digestate to kitchen waste was 2.5∶7.5, it could enter the high-temperature period quickly and maintain for seven days in the high-temperature period, which met GB 7959—2012 Hygienic Requirements for Harmless Disposal of Night Soil. The pH, organic content, and seed germination index of the five treatments were all in line with the requirements of NY/T 525—2021 Organic Fertilizer. The lower water-soluble NH4+ in the compost product with the mass ratio of digestate to kitchen waste of 2.5∶7.5 indicated that it had less plant toxicity. Results analysis of humic acid content and ratio of humic acid and fulvic acid showed that the final product with mass ratio of digestate to kitchen waste of 2.5∶7.5 had the highest degree of humification, but it contained high levels of Na+ and Cl-, and the adverse effects of salts on plants should be taken into account in land application. In conclusion, the mass ratio of digestate to kitchen waste of 2.5∶7.5 was the optimal ratio for co-composting， which had the highest humification efficiency, the better quality of final product, and a high potential for land application.

Key words: digestate, kitchen waste, co-composting, humification

[1] LI Jianying, REN Xiaoling, WANG Xiaoyan, LAI Jinli. Analysis and Research on Carbon Emissions Throughout the Life Cycle of Biodiesel Production from Kitchen Waste Oils and Fats [J]. Environmental Sanitation Engineering, 2024, 32(5): 48-54.
[2] MA Xiang, CHEN Ping, LIANG Jing. A Study on the Physical and Chemical Characteristics of Biochar from Two Kinds of Municipal Organic Solid Waste [J]. Environmental Sanitation Engineering, 2024, 32(4): 29-35.
[3] 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.
[4] XIAO Yi, JIA Weijian. Methane Control Status and Comprehensive Utilization of Domestic Waste in Beijing [J]. Environmental Sanitation Engineering, 2024, 32(3): 9-15.
[5] LIN Xiaofeng. Study on the Determination Method of Volatile Fatty Acids in Dry Anaerobic Fermentation of Kitchen Waste [J]. Environmental Sanitation Engineering, 2024, 32(3): 42-46,53.
[6] ZHANG Yu. Research on the Current Situation and Countermeasures of Rural Domestic Waste Classification in Xi’an [J]. Environmental Sanitation Engineering, 2024, 32(3): 105-109,116.
[7] TIAN Qihuan, GAO Yanda, GONG Yabin, DU Rui, WANG Lilun, YAO Jiangang. A Pilot Study on Efficient Anaerobic Biogas Production of Kitchen Waste Under Intermediate Temperature [J]. Environmental Sanitation Engineering, 2024, 32(2): 39-45.
[8] XU Wei, GAO Ting, YIN Jin. Characterization and Kinetic Analysis of Pyrolysis of Anaerobic Digestate from Kitchen Waste [J]. Environmental Sanitation Engineering, 2024, 32(1): 37-44.
[9] ZHAO Lei, LI Ke, WANG Yadong, WU Yuan, SHAO Jun, WANG Lilun. Experimental Study on the Treatment of Kitchen Waste with Large Scale Bio-hydrolysis Reactor Under Different Operating Processes [J]. Environmental Sanitation Engineering, 2023, 31(6): 63-68.
[10] LI Yangqing, ZHANG Yunxia, YU Miao, CHANG Baojun, ZHANG Kai. Analysis of Operating Conditions During the Debugging Phase of the Medium Temperature Dry Anaerobic Fermentation System for Kitchen Waste [J]. Environmental Sanitation Engineering, 2023, 31(6): 69-73.
[11] YANG Ying, REN Xiaoling, WANG Xiaoyan, SUN Yu, LAI Jinli. Feasibility Study of Household Kitchen Waste Pulverizer Application in Beijing [J]. Environmental Sanitation Engineering, 2023, 31(4): 22-26.
[12] BAI Xiaolong, LI Feng, SUN Jiang, BI Zhuoying. Analysis on Influencing Factors of Residents’ Willingness to Collect Kitchen Waste Separately：Based on Integrated Theory of Planned Behavior and Norm Activation Model [J]. Environmental Sanitation Engineering, 2023, 31(3): 94-101.
[13] ZHAO Lei, WU Yuan, SHAN Jun, WANG Yadong, SHAO Jun, LI Ke. Pilot Scale Study on the Effect of Operating Parameters on the Bio-hydrolysis Reaction of Kitchen Waste [J]. Environmental Sanitation Engineering, 2023, 31(2): 57-62.
[14] XU Baochao, CHEN Ying, SHI Xiaoshuang, YANG Chunhong, FENG Quan, GUO Rongbo. Study on Detection and Germicidal Effect of Bacteria and Pathogenic Bacteria on the Surface of Kitchen Waste Sorting Equipments [J]. Environmental Sanitation Engineering, 2023, 31(2): 101-107.
[15] QU Yang, LI Yuezhong, ZHU Weibing, WU Yuan, ZHU Like, WANG Weiping. Influence of Recycled Materials on the Treatment Effect of Kitchen Waste by Two-Step Composting [J]. Environmental Sanitation Engineering, 2023, 31(1): 16-15.
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