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Frontiers of Environmental Science & Engineering

ISSN 2095-2201

ISSN 2095-221X(Online)

CN 10-1013/X

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2018 Impact Factor: 3.883

Front. Environ. Sci. Eng.    2023, Vol. 17 Issue (11) : 136    https://doi.org/10.1007/s11783-023-1736-7
RESEARCH ARTICLE
Distribution of PCDD/Fs in a food waste anaerobic digestion process with biogas utilization
Junxiao Wei1, Jinru Zhang1, Huan Li1(), Jianguo Liu1,2(), Zhou Deng3, Chao Zhou4
1. Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
2. School of Environment, Tsinghua University, Beijing 100084, China
3. Shenzhen Lisai Environmental Technology Co. Ltd., Shenzhen 518055, China
4. Shenzhen Municipal Sanitation Department, Shenzhen 518055, China
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Abstract

● The PCDD/F distribution patterns of the FW-AD process were investigated.

● PCDD/F emission characteristics in biogas utilization exhaust gas were revealed.

● A negative balance of 2.48 μg I-TEQ/t RFW was found for the FW-AD process.

● PCDD/F emissions from China’s FW-AD plants were about 128.21 mg I-TEQ in 2020.

● AD will reduce 12.5%–21.3% of PCDD/F emissions compared to co-incineration.

Food waste (FW) is a major component of municipal solid waste (MSW) in developing countries such as China. Anaerobic digestion (AD) is a widely-applied FW biological treatment method following MSW classification. With FW diversion from conventional incineration plants, the environmental risk caused by trace toxic pollutants, such as polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs), should be reevaluated. This study investigated a full-scale FW-AD plant in Shenzhen, China, and addressed two important underexplored issues: the distribution patterns of PCDD/Fs during the FW-AD process and PCDD/F emission characteristics of the biogas utilization exhaust gas. Mass balance demonstrated a negative balance of 2.48 μg I-TEQ/t of raw FW (RFW), thus indicating that AD produced moderate PCDD/F emissions. The detailed findings were as follows: 1) PCDD/F toxic equivalents (TEQs) in pure FW (RFW without impurities) were lower than in RFW, indicating that MSW source separation is crucial for decreasing the PCDD/F input into the AD system; 2) PCDD/F contents (6.20–8.27 pg I-TEQ/g dry weight) in solid digestate were near the screening value of development land in China’s national standard (GB36600-2018), thus indicating that the potential environmental risk from the land application of solid digestate should be considered; and 3) PCDD/F TEQs (0.001–0.022 ng I-TEQ/Nm3) in biogas utilization exhaust gas were roughly equivalent to those produced by MSW incinerators in Shenzhen. This study indicated that compared with co-incineration with other waste, FW-AD will reduce PCDD/F emissions (air) from MSW incineration plants by 12.5%–21.3% at the national level under an FW separation scenario.

Keywords Biological treatment      MSW classification      Mass balance      Solid digestate     
Corresponding Author(s): Huan Li,Jianguo Liu   
About author:

* Both are co-first authors.

Issue Date: 15 November 2023
 Cite this article:   
Junxiao Wei,Jinru Zhang,Huan Li, et al. Distribution of PCDD/Fs in a food waste anaerobic digestion process with biogas utilization[J]. Front. Environ. Sci. Eng., 2023, 17(11): 136.
 URL:  
https://academic.hep.com.cn/fese/EN/10.1007/s11783-023-1736-7
https://academic.hep.com.cn/fese/EN/Y2023/V17/I11/136
Fig.1  Material balance and sampling sites of the food waste anaerobic digestion (FW-AD) process (#1 through #13 refer to the sampling sites. Biogas (DeH2S) means desulfurized biogas).
Samples Total Cl1–8DD/Fs (pg/g) PCDD/Fs (pg/g) PCDD/Fs (pg I-TEQ/g)
RFW 2140.22 ± 1847.86 174.70 ± 66.33 2.63 ± 0.57
Initial sludge 16.76 ± 0.71 7.91 ± 1.03 (1.04 ± 0.19) × 10−1
Lipid 7.65 ± 2.35 3.27 ± 1.48 (4.95 ± 1.73) × 10−2
Fine residual 1018.24 ± 996.79 96.13 ± 70.63 1.34 ± 0.85
Filter liquor 293.16 ± 7.66 109.15 ± 3.64 1.04 ± 0.16
Acidification sludge 84.23 ± 4.72 31.75 ± 3.46 (3.16 ± 0.47) × 10−1
Biogas slurry 7.69 ± 0.37 3.40 ± 0.13 (4.29 ± 0.29) × 10−2
Raw biogas a) (8.23 ± 1.04) × 10−1 (1.80 ± 0.84) × 10−1 (3.33 ± 1.82) × 10−3
Biogas (DeH2S) a) (8.00 ± 1.24) × 10−1 (2.10 ± 0.34) × 10−1 (2.35 ± 0.30) × 10−3
Wastewater 2.63 ± 1.26 (8.02 ± 5.33) × 10−1 (2.43 ± 0.78) × 10−2
Solid digestate 456.97 ± 17.33 278.07 ± 31.54 2.48 ± 0.33
EG (SG) a) 1.37 ± 1.10 (2.50 ± 4.52) × 10−1 (6.10 ± 7.96) × 10−3
EG (CHP) a) 0.66 ± 0.36 (3.33 ± 0.97) × 10−2 (1.57 ± 0.41) × 10−3
Tab.1  PCDD/F concentrations in the samples during the entire FW-AD process
Fig.2  Mass balance of the PCDD/Fs in the food waste aerobic digestion (FW-AD) process (raw food waste: RFW; steam generation: SG; exhaust gas: EG; combined heat and power: CHP).
Fig.3  Proportion of PCDD/F congeners to Cl1–8CDD/Fs in the samples. (a) Mass concentration; (b) TEQs (Acid sludge means acidification sludge. BG means biogas. DeH2S BG means desulfurization of biogas. EG (SG) means exhaust gas from steam generator. EG (CHP) means exhaust gas from the combination of heat and power).
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