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Ms. Xue Liu
Institute of Environment and Sustainable Development in Agriculture,Chinese Academy of Agricultural Scicences

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0 Vermicomposting
0 Waste Management
0 nonpoint source pollution
0 waste water
0 bio-fertilizer

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Journal article
Published: 23 April 2021 in Agronomy
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Dairy cattle farming produces large amounts of wastewater and it causes environmental pollution and eutrophication of rivers, but the nutrients in the waste could be recycled. Here, an improved vermicomposting system was applied to dairy farm wastewater, and wastewater with a nitrogen content of 100 mg/L and 200mg/L tested with different combinations of organic substrates such as cow manure and rice straw in rural solid waste. Results showed that earthworms could continuously grow, wastewater (N 100mg/L) mixed with rice straw corresponding to the most significant gained weight for Eisenia fetida earthworms (2.38 to 9.12-fold), and the earthworms’ weight was positively correlated with the C/N ratio, organic matter content, and pH. Compared to the initial state, the system significantly changed physicochemical parameters in nutrients, such as the percentages of total nitrogen, phosphorous, and potassium, which were found to increase in vermicomposting while organic matter content, C/N ratio, and cellulose declined as a function of the vermicomposting period, and the final vermicompost was better for the absorption of plants. These results suggest that continuous wastewater addition improved the effective transformation of organic waste to allow valorizing a broad range of organic residues, and avoid the risk of environmental pollution in dairy cattle farming.

ACS Style

Xue Liu; Bing Geng; Changxiong Zhu; Lianfang Li; Frédéric Francis. An Improved Vermicomposting System Provides More Efficient Wastewater Use of Dairy Farms Using Eisenia fetida. Agronomy 2021, 11, 833 .

AMA Style

Xue Liu, Bing Geng, Changxiong Zhu, Lianfang Li, Frédéric Francis. An Improved Vermicomposting System Provides More Efficient Wastewater Use of Dairy Farms Using Eisenia fetida. Agronomy. 2021; 11 (5):833.

Chicago/Turabian Style

Xue Liu; Bing Geng; Changxiong Zhu; Lianfang Li; Frédéric Francis. 2021. "An Improved Vermicomposting System Provides More Efficient Wastewater Use of Dairy Farms Using Eisenia fetida." Agronomy 11, no. 5: 833.

Journal article
Published: 29 September 2020 in Water
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Arsenic has become a global concern in water environment, and it is essential to develop efficient remediation methods. In this study, a novel adsorbent by loading cerium and manganese oxide onto wheat straw-modified biochar (MBC) was manufactured successfully aiming to remove arsenic from polluted water. Through scanning electron microscopy and energy-dispersive spectroscopy (SEM-EDS), X-ray diffractometer (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectrometer (FT-IR), and other techniques, it was found the loading of cerium and manganese oxide on MBC played a significant role in As(V) adsorption. The results of the batch test showed that the adsorption of MBC followed the pseudo-second order kinetics and Langmuir equation. The adsorption capacity of MBC was 108.88 mg As(V)/g at pH = 5.0 (C0 = 100 mg/L, dosage = 0.5 g/L, T = 298 K) with considerable improvement compared to the original biochar. Moreover, MBC exhibited excellent performance over a wide pH range (2.0~11.0). Thermodynamics of the sorption reaction showed that the entropy (ΔS), changes of enthalpy (ΔH) and Gibbs free energy (ΔG), respectively, were 85.88 J/(moL·K), 22.54 kJ/mol and −1.33 to −5.20 kJ/mol at T = 278~323 K. During the adsorption, the formation of multiple complexes under the influence of its abundant surface M-OH (M represents the Ce/Mn) groups involving multiple mechanisms that included electrostatic interaction forces, surface adsorption, redox reaction, and surface complexation. This study indicated that MBC is a promising adsorbent to remove As(V) from polluted water and has great potential in remediating of arsenic contaminated environment.

ACS Style

Ting Liang; Lianfang Li; Changxiong Zhu; Xue Liu; Hongna Li; Qianqian Su; Jing Ye; Bing Geng; Yunlong Tian; Muhammad Fahad Sardar; Xiaoya Huang; Feng Li. Adsorption of As(V) by the Novel and Efficient Adsorbent Cerium-Manganese Modified Biochar. Water 2020, 12, 2720 .

AMA Style

Ting Liang, Lianfang Li, Changxiong Zhu, Xue Liu, Hongna Li, Qianqian Su, Jing Ye, Bing Geng, Yunlong Tian, Muhammad Fahad Sardar, Xiaoya Huang, Feng Li. Adsorption of As(V) by the Novel and Efficient Adsorbent Cerium-Manganese Modified Biochar. Water. 2020; 12 (10):2720.

Chicago/Turabian Style

Ting Liang; Lianfang Li; Changxiong Zhu; Xue Liu; Hongna Li; Qianqian Su; Jing Ye; Bing Geng; Yunlong Tian; Muhammad Fahad Sardar; Xiaoya Huang; Feng Li. 2020. "Adsorption of As(V) by the Novel and Efficient Adsorbent Cerium-Manganese Modified Biochar." Water 12, no. 10: 2720.

Article
Published: 03 January 2018 in Journal of Chemical Technology & Biotechnology
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Microalgae which have greater biodegradable fractions than other organics were chosen as a carbon source for sulfate-reducing bacteria (SRB). Immobilized SRB–microalgae beads were then prepared and used for bioremediation of synthetic copper mine wastewater. We observed hydrolysis fermentation of the microalgae and noted that the microalgae were first degraded to volatile fatty acids by co-existing fermentative bacteria; they then served as a carbon source for SRB. Freshly prepared immobilized SRB beads not only possessed high mechanical strength and mass transfer ability, but also showed better sulfate reduction than that of suspended SRB. Moreover, immobilized SRB-Scenedesmus obliquus beads packed in the upflow bioreactor were satisfactory for the treatment of copper mine wastewater, as shown by the high removal efficiency of their sulfate (182.17 mg SO42-·g-1 microalgae·day-1) and copper ions (45.28 mg Cu2+·g-1 microalgae·day-1), and low discharge of chemical oxygen demand. After the reaction, metal sulfides were not produced on the bead surfaces, but likely within them. The anaerobic bioreactor, filled with immobilized SRB-Scenedesmus obliquus beads, demonstrated excellent removal efficiency and low discharge of chemical oxygen demand, which may provide a promising strategy for dealing with heavy metal pollution in water.

ACS Style

Yongchao Li; Xiaoyan Yang; Bing Geng; Xue Liu. Effective bioremediation of Cu(II) contaminated waters with immobilized sulfate-reducing bacteria-microalgae beads in a continuous treatment system and mechanism analysis. Journal of Chemical Technology & Biotechnology 2018, 93, 1453 -1461.

AMA Style

Yongchao Li, Xiaoyan Yang, Bing Geng, Xue Liu. Effective bioremediation of Cu(II) contaminated waters with immobilized sulfate-reducing bacteria-microalgae beads in a continuous treatment system and mechanism analysis. Journal of Chemical Technology & Biotechnology. 2018; 93 (5):1453-1461.

Chicago/Turabian Style

Yongchao Li; Xiaoyan Yang; Bing Geng; Xue Liu. 2018. "Effective bioremediation of Cu(II) contaminated waters with immobilized sulfate-reducing bacteria-microalgae beads in a continuous treatment system and mechanism analysis." Journal of Chemical Technology & Biotechnology 93, no. 5: 1453-1461.