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Efficient Disposal of the Aqueous Products of Wet Organic Waste Hydrothermal Carbonization by Paddy Constructed Wetlands

文献类型： 外文期刊

作者： He, Huayong 1 ; Wang, Bingyu 3 ; Wu, Jun 4 ; Han, Lanfang 5 ; Xie, Huifang 3 ; Rong, Shaopeng 3 ; Duan, Jingjing 1 ; Xue, Lihong 1 ; Feng, Yanfang 1 ; Rinklebe, Jorg 6 ; Xing, Baoshan 7 ;

作者机构： 1.Jiangsu Acad Agr Sci, Inst Agr Resources & Environm, Key Lab Agroenvironm Downstream Yangtze Plain, Minist Agr & Rural Affairs, Nanjing 210014, Peoples R China

2.Jiangsu Univ, Sch Environm & Safety Engn, Zhenjiang 212001, Jiangsu, Peoples R China

3.Nanjing Univ Sci & Technol, Sch Environm & Biol Engn, Jiangsu Key Lab Chem Pollut Control & Resources R, Nanjing 210094, Peoples R China

4.Hohai Univ, Coll Environm, Key Lab Integrated Regulat & Resources Dev Shallo, Minist Educ, Nanjing 210098, Peoples R China

5.Guangdong Univ Technol, Inst Environm & Ecol Engn, Guangdong Prov Key Lab Water Qual Improvement & E, Guangzhou 510006, Peoples R China

6.Univ Wuppertal, Inst Fdn Engn Water & Waste Management, Sch Architecture & Civil Engn, Lab Soil & Groundwater Management, D-42285 Wuppertal, Germany

7.Univ Massachusetts, Stockbridge Sch Agr, Amherst, MA 01003 USA

关键词： hydrothermal carbonization; aqueous product; paddy constructed wetland; disposal; wet organic waste

期刊名称：ACS ES&T ENGINEERING （ 影响因子：7.1； 五年影响因子：7.1 ）

ISSN：

年卷期： 2022 年

页码：

收录情况： SCI

摘要： The hydrothermal carbonization (HTC) technology has recently been broadly applied. However, disposal of the accompanying high-strength HTC aqueous products (HCAPs) largely determines the promotion and application of the HTC technology. The direct discharge of HCAPs might deteriorate the water environment, and previous studies have reported that HCAPs were insecurely removed via anaerobic fermentation or microalgae production. In this work, wet organic waste HCAPs were characterized and identified, and their removal efficiency in a paddy constructed wetland (PCW) was determined. The HCAPs were found to be rich in nutrients and mainly composed of humic acid (77.8-84.7%) or lignin (44.8-68.2%). With increasing HTC temperature, the relative humic acid content in HCAPs decreased by 4.4-6.4%, as determined by the three-dimensional fluorescence excitation-emission matrix (3D-EEM) analysis. HCAPs also underwent decomposition and polymerization due to the change in MWw and Al-mod as determined by Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) analysis. The PCW removal efficiency of NH4+-N and chemical oxygen demand (COD) reached 99.2 and 93.2% in the HCAP treatments, respectively, which were much higher than the values obtained for traditional disposal applications. On the basis of the higher soil NH4+-N content (1.6- to 6.0-fold), larger grain total nitrogen (TN) content (5.1-18.6%), and lower fluorescence intensity (5.7-88.2%), three primary processes (i.e., uptake by rice plants, microbial degradation, and soil immobilization) were proposed as PCW removal mechanisms. This study provides novel utilization prospects for the resource utilization of HCAPs in PCW systems.

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