Water contaminated with emerging pollutants has become a serious environmental issue globally. Biochar is a porous and carbon-rich material produced from biomass pyrolysis and has the potential to be used as an integrated adsorptive material. Many studies have shown that biochar is capable to adsorb emerging pollutants from aquatic systems and could be used to solve the water pollution problem. Here, we provided a dual perspective on removing emerging pollutants from aquatic systems using biochar and analyzed the emerging pollutant removal efficiency from the aspects of biochar types, pollutant types and coexistence with heavy metals, as well as the associated mechanisms. The potential risks and future research directions of biochar utilization are also presented. This review aims to assist researchers interested in using biochar for emerging pollutants remediation in aquatic systems and facilitate research on emerging pollutants removal, thereby reducing their environmental risk.
Abstract. On the basis of two-sided markets theory and platform theory, this paper studies the pricing of waste mobile phone recycling platform from the perspective. This thesis builds models and has an analysis to the competitive platform under three kinds of charging mode, discusses the influence factors of platform pricing and profit under equilibrium state, and the pricing and profit of monopoly platform and competition platform in three kinds of charging mode, and then the model is built and analyzed in two conditions which are multi-homing and cooperation between platforms.
Determine the tender control price reasonable is not only the key to the success of bidding work, but also the first step of consummate the market pricing. In view of the establishment of tender control price in force lack of accuracy, this paper build the oil and gas drilling engineering tender control price model in the perspective of two-part tariff ideology. We make bill of quantities, geological conditions and environmental protection investment as the project construction cost into fixed fee, make the cost of labor and materials, which under the advanced social average level, as the fee to encourage enterprises improve their technology management into variable fee. Meanwhile, select two indicators, the consumer price index and international crude oil price, reflect the price change. Provide a reference for complete the establishment of oil and gas drilling engineering tender control price and improve the forecast accuracy of the project investment.
Abstract. Cellphone recycling website with advantages such as convenience, efficiency, professionalism and environmental protection, and many other advantages, has become into a new channel for recycling of waste cellphones. And the key for its popularity and successful operation is to obtain the initial trust of consumers. For the influencing factors of initial trust of websites, scholars have researched a lot from the aspects of site factors, consumer and environmental factors. On the basis of previous studies, this paper combines with the characteristics of cellphone recycling sites, considers the effects the environmental responsibility performance of recycling sites and consumer awareness of environmental protection have on initial trust.
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