Online evaluation method of coal mine comprehensive level based on FCE.

An online evaluation method of coal mine comprehensive level based on Fuzzy Comprehensive Evaluation method (FCE) is proposed. Firstly, following the principles of fairness, systematicness and hierarchy, taking research and development, production, sales, finance, safety and management as the first level indicators, a set of multi-level evaluation indicator system of coal mine comprehensive level combining objective and subjective evaluation indicators is established. Secondly, according to the characteristics of the indicator system, the specific process of FCE of coal mine comprehensive level is given. Then, taking SQL Server as the database management system and C#.NET as the development language, a set of B/S structure online evaluation system of coal mine comprehensive level based on FCE is designed and developed. Finally, the proposed method is applied to Coal group PM for test. The application shows that the method proposed can provide an efficient and convenient online evaluation platform to evaluate the comprehensive level of coal mines for the Coal group, and the horizontal and longitudinal comparison of the evaluation results can urge the coal mines to maintain their advantages and avoid their disadvantages, which is of some significance for improving the overall competitiveness of the Coal group.

Engineering strategies for enhancing C. vulgaris ESP-31 lipid production using effluents of coke-making wastewater.

Microalgae cultivation using wastewater is an approach for simultaneous wastewater treatment and biofuels/chemicals productions. In this study, three microalgae species Chorella vulgaris ESP-31, Chorella sorokiniana CY-1 and Scenedesmus sp. were cultivated using coke-making wastewater generated from a steel-making company. Of these, C.vulgaris ESP-31 had the best tolerance towards wastewater, with maximal biomass concentration of 2.82 g/l and lipid productivity of 32.3 mg/l/d. The highest biomass concentration 3.98 g/l and lipid productivity of 47.1 mg/l/d was obtained in 20% wastewater. Immobilization approach was applied to boost biomass growth and lipid production. Both maximal biomass growth (5.17 g/l) and lipid productivity (68.4 mg/l/d) was significantly enhanced with activated charcoal addition. Semi-batch cultivation resulted in stable biomass production and lipid productivity of 5.18 g/l and 77.3 mg/l/d, respectively. This study has revealed that C. vulgaris ESP-31 is a potential candidate for growth in coke making wastewater and biofuel production.