Search

This paper summarizes the research progress of sludge resource utilization technology, analyzes the mechanism of different pretreatment processes on the dissolution of sludge substances and the dissolution effect, and compares the advantages and shortcomings of different pretreatment methods; summarizes the resource recycling and utilization pathways such as protein recovery, alginate recovery and anaerobic fermentation after sludge pretreatment; and provides suggestions and perspectives on the engineering application of sludge pretreatment and resource utilization. The recommendations and prospects for the engineering application of sludge pretreatment and resource utilization are also provided. [ABSTRACT FROM AUTHOR]

The hazards of sludge, the status quo of treatment and disposal, and the preparation process of sludge ceramsites were summarized・ The application and mechanism of sludge ceramsites in the adsorption of nitrogen, phosphorus, heavy metals, organic matter and turbidity removal are systematically reviewed, so as to provide a reference for sludge ceramsites in the field of sewage treatment. The limitations of sludge ceramsites in water purification are analyzed, and its future development direction is prospected. [ABSTRACT FROM AUTHOR]

The synthesis and properties of PLA fiber are introduced, and the research progress of PLA fiber blending modification and composite material development for textile field in recent years is described・ Through modification and development, the properties and applicability of PLA fiber in the field of textiles are enhanced, the synthetic methods of materials are improved, and the PLA fiber is further promoted to the market. [ABSTRACT FROM AUTHOR]

The extraction of inulin from Jerusalem artichoke was carried out by hydrothermal method. Through designing single factor experiment, three main factors affecting the extraction temperature, time and phosphoric acid concentration were determined. Using response surface method for optimal analysis of the extraction process of inulin, using the Design-Expert software to design three factors and three levels of experiments, obtained the best extraction conditions of inulin; water bath temperature 87 °C, extraction time 82 min,phosphate concentration 0.7 g/L,under this condition,the extraction rate of inulin reached 22.44%. The results are consistent with the predicted values, which proves that the prediction model is effective and can be used to optimize the extraction process of inulin. This study provides theoretical basis and data support for the further development and utilization of Jerusalem artichoke in plateau area. [ABSTRACT FROM AUTHOR]

Mitika is an important representative plateau wetland in China. In order to study the spatial distribution characteristics and pollution status of heavy metals in the surface soil of the wetland, 25 surface soils were collected. The pollution of heavy metals (Cu, Zn, Cr, Ni, Pb, Cd, As and Hg) in wetland soil was evaluated by geo-accumulation index method and potential ecological risk index (RI). The results showed that the average concentrations of Cu, Cr, Ni and Pb in wetland soil in the study area were lower than the background value of Tibet soil, while the average concentrations of Zn, Cd, As and Hg are 1.11, 1.75, 1.15 and 1.53 times of the background value respectively, which was far lower than the risk screening value of GB 15618-2018 soil environmental quality standard, standard for soil pollution risk control of agricultural land (Trial); Except that the accumulation index of Cd element was 0.08, which was slightly polluted, other elements were at the pollution-free level; The potential ecological risk in the study area was moderate, which was mainly related to the accumulation of Hg in the environment and the local low background value; Cu, Zn, Cr, Ni, Pb, Cd and As were mainly from natural sources. Hg was greatly affected by human activities, which brought certain risks to the ecological environment and need to attention. However, the overall environmental quality of wetlands was better than that of other wetlands in China. [ABSTRACT FROM AUTHOR]