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Modified biomass charcoal for treating arsenic pollution as well as preparation method and application of modified biomass charcoal

The invention provides modified biomass charcoal for treating arsenic pollution as well as a preparation method and an application of the modified biomass charcoal. The preparation method of the modified biomass charcoal comprises steps as follows: (1) biomass raw materials are charred, and the biomass charcoal is obtained; (2) the biomass charcoal is subjected to a reaction with a hydrochloric acid solution, solid-liquid separation is performed, a solid substance is obtained, is washed till the pH is neutral and then is dried, and the pretreated biomass charcoal is obtained; (3) the pretreated biomass charcoal and a FeCl3 solution are subjected to a reaction under the condition that the solution pH is neutral, solid-liquid separation is performed after the reaction, and mud cake is obtained; (4) the mud cake is dried and then washed till the pH is neutral, solid-liquid separation is performed, an obtained solid is dried for a second time, and the modified biomass charcoal is obtained. The modified biomass charcoal has large specific surface area and high iron content; the preparation method is simple and easy to operate; the modified biomass charcoal can be applied to treatment of arsenic waste and passivation of arsenic in farmland soil, and food safety is guaranteed.
Owner:INST OF ENVIRONMENT & SUSTAINABLE DEV IN AGRI CHINESE ACADEMY OF AGRI SCI

Seawater desalting method and device

InactiveCN101955238AControl water productionMeet water production requirementsGeneral water supply conservationSeawater treatmentEngineeringEvaporation chamber
The invention discloses a seawater desalting method and a seawater desalting device. Wind power is used as a working power supply in the method; the heated purified water is fed into a heat storage tank, and heat is circularly supplied by two paths; one path of hot water enters a first effect of a multi-effect distilled seawater desalting device and is used as a seawater desalting heat source, and enters the heat storage tank after heat release; the other path of hot water enters a pre-heater of the first effect of the multi-effect distilled seawater desalting device to a pre-heater of the last effect in turn, and flows back to the heat storage tank after pre-heating the seawater; after the seawater in a first effect evaporation chamber is evaporated in a falling film tube, the obtained thick seawater is led out, and the generated steam enters a second effect falling film tube and is used as a seawater evaporation heat source; the seawater flowing out from the next effect evaporation chamber is heated by the previous pre-heater and then enters the previous effect evaporation chamber; and the condensed steam generated by the last effect evaporation chamber is used as produced fresh water for discharge. The device is suitable for the seawater desalting method, and mainly comprises a solar heat collecting system, a seawater pre-heating system, a multi-effect distilled seawater desalting system and a heat pump system.
Owner:HEBEI UNIV OF TECH

Solar energy sea water desalinization device based on reflection and total reflection

The invention discloses a solar energy sea water desalinization device based on reflection and total reflection, and belongs to the technical field of solar energy heat collection and water treatment. The device is composed of an upper surface transparent film, a total reflection solid film with a gradually-varied wall thickness and hydrophilic capillary tubes; the plurality of devices can be arranged and combined to form multiple solar energy sea water desalinization films; the combined devices are floated on the sea surface for use. According to the invention, a capillary phenomenon is utilized to enable sea water to go up to the upper ends of the capillary tubes, sunlight enters through the upper surface layer transparent film, and is subjected to reflection or total reflection when being in contact with an inner surface, and finally the sunlight is gathered on the black hydrophilic fiber capillary tubes to generate heat energy to realize sea water evaporation. The convection and heat exchange of the raised water vapor and external air is realized through the upper surface layer transparent film, the water vapor is condensed to generate fresh water on the inner side of the transparent film, the fresh water slips through the inner wall of a reflecting surface, and flows into the lower part of a housing through water outlet holes in the wall of a supporting cylinder to be stored. The fresh water is conveyed to users after accumulation, and meanwhile, small-sized plant can be planted at sea.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
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