ANALYSIS OF CHANGES IN CHARACTERISTICS OF KITCHEN WASTE AFTER SORTING AND DOMESTIC WASTE BEFORE SORTING IN BEIJING

ZHANG Tong; ZHANG Liqiu; FENG Li; LIU Yongze; DU Ziwen

doi:10.13205/j.hjgc.202212004

Volume 40 Issue 12

Nov. 2022

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2022 > 40(12): 22-28

ZHANG Tong, ZHANG Liqiu, FENG Li, LIU Yongze, DU Ziwen. ANALYSIS OF CHANGES IN CHARACTERISTICS OF KITCHEN WASTE AFTER SORTING AND DOMESTIC WASTE BEFORE SORTING IN BEIJING[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(12): 22-28. doi: 10.13205/j.hjgc.202212004

Citation:

ZHANG Tong, ZHANG Liqiu, FENG Li, LIU Yongze, DU Ziwen. ANALYSIS OF CHANGES IN CHARACTERISTICS OF KITCHEN WASTE AFTER SORTING AND DOMESTIC WASTE BEFORE SORTING IN BEIJING[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(12): 22-28. doi: 10.13205/j.hjgc.202212004

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ANALYSIS OF CHANGES IN CHARACTERISTICS OF KITCHEN WASTE AFTER SORTING AND DOMESTIC WASTE BEFORE SORTING IN BEIJING

doi: 10.13205/j.hjgc.202212004

ZHANG Tong^1,2,
ZHANG Liqiu^{1,2
,
,},
FENG Li^1,2,
LIU Yongze^1,2,
DU Ziwen^1,2

1. Beijing Key Laboratory for Source Control Technology of Water Pollution, Beijing Forestry University, Beijing 100083, China;
2. College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China

Received Date: 2022-02-16
Available Online: 2023-03-23

Abstract

Abstract

On May 1st, 2020, Beijing officially implemented the Beijing Municipal Household Waste Management Regulations. In order to understand the changes in the characteristics of kitchen waste after garbage classification and domestic waste before classification in Beijing, the garbage in the kitchen waste garbage bins in the garbage classification collection points of residential areas was sampled and analyzed, and then compared with the domestic garbage mix collected and transported in Beijing before classification. The results showed that after Beijing implemented garbage classification, the proportions of kitchen waste components in kitchen waste bins gradually increased. After one year of implementation, the proportion of kitchen waste components reached 99%. The moisture content and bulk density of kitchen waste increased significantly, compared with that before classification, and the combustible points and calorific value were significantly reduced, so it was not suitable for incineration treatment; pH and C/N showed a downward trend, conductivity showed a tiny growing trend, and the contents of organic matter, total nitrogen (in terms of nitrogen element), total phosphorus (in terms of P₂O₅) and total potassium (in terms of K₂O) increased, and the potential for waste resource utilization also increased. Among the seven kinds of heavy (metalloid) metals with greater harm, such as Cd, Pb, Cr, Hg, As, Cu and Zn, except for As, the content of the remaining metal elements showed a downward trend; among the metal elements such as Na, Ca, Mg, Fe, and Mn, the content of the remaining elements, except Na, showed a downward trend. Therefore, the metal content in kitchen waste could be effectively controlled through the garbage sorting, so that the seed germination index could be increased, the biological toxic effect on plants reduced, and the environmental risk reduced. This study can provide a reference and basis for the planning of waste resource utilization and treatment facilities in Beijing.
- kitchen waste,
- garbage sorting,
- characteristics,
- resource utilization,
- Beijing

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References(31)

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