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Yin J.,Zhejiang GongShang University | Yin J.,Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling | Wang K.,Zhejiang GongShang University | Wang K.,Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling | And 7 more authors.
Bioresource Technology | Year: 2014

Food waste (FW) was pretreated by a hydrothermal method and then fermented for volatile fatty acid (VFAs) production. The soluble substance in FW increased after hydrothermal pretreatment (≤200°C). Higher hydrothermal temperature would lead to mineralization of the organic compounds. The optimal temperature for organic dissolution was 180°C, at which FW dissolved 42.5% more soluble chemical oxygen demand than the control. VFA production from pretreated FW fermentation was significantly enhanced compared with the control. The optimal hydrothermal temperature was 160°C with a VFA yield of 0.908g/g VSremoval. Butyrate and acetate were the prevalent VFAs followed by propionate and valerate. FW fermentation was inhibited after 200°C pretreatment. The VFAs were extracted from the fermentation broth by liquid-liquid extraction. The VFA recovery was 50-70%. Thus, 0.294-0.411g VFAs could be obtained per gram of hydrothermally pretreated FW (in dry weight) by this method. © 2014 Elsevier Ltd.


Yang Y.-Q.,Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling | Yang Y.-Q.,Zhejiang Lantu Environmental Protection Co. | Chen Z.-X.,Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling | Zhang X.-Q.,Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling | And 3 more authors.
Environmental Science and Pollution Research | Year: 2014

The effects of adding polyacrylamide (PAM), to attempt to delay the loss of capillary water and achieve a better level of organic matter humification, in the composting of kitchen waste were evaluated. Four treatments, with initial moisture content of 60 % were used: 0.1 % PAM added before the start of composting (R1), 0.1 % PAM added when the thermophilic phase of composting became stable (at >50 °C) (R2), 0.1 % PAM added when the moisture content significantly decreased (R3), and no PAM added (R4). The introduction of PAM in R1 and R2 significantly increased the capillary force and delayed the loss of moisture content and capillary water. The introduction of PAM in R2 and R3 improved the composting process, in terms of the degradation of biochemical fractions and the humification degree. These results show that the optimal time for adding PAM was the initial stage of the thermophilic phase. © 2014, Springer-Verlag Berlin Heidelberg.


Yang Y.,Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling | Yang Y.,Zhejiang Lantu Environmental Protection Co. | Wang K.,Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling | Huang H.,Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling | And 5 more authors.
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2015

Compared with the complicated mixed domestic waste, kitchen waste needs a designated sampling method due to its single composition. Based on the background of domestic waste classification and the standard sampling and analysis methods for domestic waste (CJ/T 313-2009), this study was carried out to investigate the effect of sampling points and positions on the classified kitchen waste's nature. It is indicated that the sample only from the middle position of container is not representative, and sampling strategy should differ with the kitchen waste points. Namely, all points should be sampled when the kitchen waste is no more than two, only two points should be sampled when it is 3 to 7, while three points must be sampled when it is 8 to 18. The sampling points are obviously less than the same scenarios defined in CJ/T 313-2009. The minimal sampling points increases with the increasing of kitchen waste amount, but the sampling position still depends on the sampling points. ©, 2015, Science Press. All right reserved.


Shen D.-S.,Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling | Yang Y.-Q.,Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling | Yang Y.-Q.,Zhejiang Lantu Environmental Protection Co. | Huang H.-L.,Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling | And 2 more authors.
Waste Management | Year: 2015

Changes in water states during the composting of kitchen waste were determined. Three experiments, R55, R60, and R65, with different initial moisture contents, 55%, 60%, and 65%, respectively, were performed. Three water states, entrapped water (EW), capillary water (CW), and multiple-molecular-layer water (MMLW), were monitored during the experiments. Changes only occurred with the EW and CW during the composting process. The percentage of EW increased, and the percentage of CW decreased as the composting process progressed. The R60 experiment performed better than the other experiments according to changes in the temperature and carbon-to-nitrogen ratio (C/N). The percentage of EW correlated well (P<0.05) with the dissolved organic carbon content (DOC), electrical conductivity (EC), pH, and C/N, and was affected by the hemicellulose and cellulose contents. © 2015 Elsevier Ltd.

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