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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.
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 StyleXue 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 StyleXue 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.
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.
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 StyleTing 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 StyleTing 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.
This study aimed to determine effects of biochar derived from wheat straw at 500 °C on arsenic immobilization in a soil-Brassica campestris L system. When the soils amended with 4% modified biochar (MBC), 0.5% Fe grit as zero-valent iron (ZVI), 0.5% Fe grit + 4% MBC (ZMBC), 0.5% ZVI + 4% biochar (ZBC), 4% biochar (BC), and control (without amendments), it confirmed that available arsenic concentration in soils occurred in the following order: ZMBC < MBC < ZVI < ZBC < Control < BC. Water-soluble As (WSAs) was reduced by 89.74% and 92.30% in MBC- and ZMBC-amended soils, respectively, compared to the control. When MBC applied into soil, As uptake of shoot and root decreased by 44.55% and 45.40%, respectively, and ZMBC resulted in 74.92% and 71.80% reduction in shoot and root As of Brassica campestris L. Immobilization effect of As in ZBC was also observed though BC elevated plant As uptake significantly. The immobilization effect of MBC was mainly attributed to Fe2O3 impregnation illustrated by x-ray diffraction (XRD) and scanning electron microscopy (SEM) images through sorption, precipitation, and coprecipitation. Such Fe containing complexes might impede As translocation from root to shoot and subsequently reduce As accumulation in the plant with modified biochar amendment.
Lianfang Li; Changxiong Zhu; Xiaoshi Liu; Feng Li; Hongna Li; Jing Ye. Biochar amendment immobilizes arsenic in farmland and reduces its bioavailability. Environmental Science and Pollution Research 2018, 25, 34091 -34102.
AMA StyleLianfang Li, Changxiong Zhu, Xiaoshi Liu, Feng Li, Hongna Li, Jing Ye. Biochar amendment immobilizes arsenic in farmland and reduces its bioavailability. Environmental Science and Pollution Research. 2018; 25 (34):34091-34102.
Chicago/Turabian StyleLianfang Li; Changxiong Zhu; Xiaoshi Liu; Feng Li; Hongna Li; Jing Ye. 2018. "Biochar amendment immobilizes arsenic in farmland and reduces its bioavailability." Environmental Science and Pollution Research 25, no. 34: 34091-34102.