Abstract: A biochar is produced by co-pyrolysing an aquatic plant enriched with heavy metals with a clay mineral, and the aquatic plants themselves have high enrichment and adsorb heavy metals in contaminated water; heavy metals are in situ adsorbed, and are coated or enriched in the biochar, therefore extending the migration time of heavy metals, which are also very stable; attapulgite and montmorillonite as clay minerals are loaded in the biochar during the preparing process; heavy metals contained in the biochar play a catalytic role, and synergy with activated attapulgite, therefore increasing the reliability of the biochar, and effectively reducing the ecological effectiveness and potential risk of heavy metals in the biochar.

Abstract: A process for producing a heavy metal mediated biochar composite using silicate solidification. Hydrocharis dubia has excellent enrichment of manganese ions in sewage, and is used to treat sewage water to adsorb heavy metals such as lead, manganese and zinc contained in the sewage water into roots, stems and leaves thereof, which are pyrolysed in stages at high temperature with activated red mud and bentonite prior to blending with zeolites, to produce said heavy metal mediated biochar composite; the process significantly extends the migration time of heavy metals, increases the stability of heavy metals and reduces the risk of environmental pollution by heavy metal leakage.

Abstract: A porous biochar for improving heavy pollution and a method for producing the same. Said porous biochar is prepared as follows: arrowhead, which has excellent enrichment of lead, is used to absorb heavy metal lead in polluted water or artificial wetlands, simultaneously absorb heavy metal cadmium, thereafter is dried and treated as a biomass, and then the biomass is calcined in stages with a passivating agent in a high temperature environment, so as to heavy metals such as lead and cadmium be stably coated or enriched in a biochar, which is mixed with Pseudomonas aeruginosa having high resistant, to obtain the porous biochar; the porous biochar has high specific surface area, high porosity and excellent mechanical properties, is very stable under different acid-base environments and oxidizing conditions.

Abstract: A composite biochar for controlling heavy metal pollution and a process for producing the same, in particular enrichment of heavy metals such as arsenic and lead in soil with centipede grass, thereafter centipede grass is sintered with hydroxyapatite, sepiolite and chitosan, and compounded with microorganisms to produce said composite biochar; through the process of the present invention, heavy metals such as arsenic and lead are stably enriched or coated in said composite biochar, significantly reducing the potential hazard of arsenic and lead to the environment, and also providing new developmental ideas for treating heavy metal biomass.

Abstract: The present invention relates to a composite treatment and recovery technique of polluted water body and soil. Iron-rich straw biomass, after being crushed, is mixed and granulated with sludge, and is pyrolytic charred by programmed heating, to obtain bulk loaded zero-valent iron biochar and sludge biochar composite particles, which are packed as fillers in a filled bed or as filters in filter cells of a fixed bed, for effective recovery of complex polluted water, polluted by heavy metals, organics, nitrogen, phosphorus, and the like.

Abstract: Embodiments of the present application disclose methods for unlocking shared bikes. A specific embodiment of the method comprises: receiving a bike-use request transmitted by a terminal, and the bike-use request is generated by the terminal upon detecting a user's selection operation of identifiers of shared bikes located near a target location and displayed on a map; transmitting a bike-use instruction to a target shared bike, so that the target shared bike sends out prompt information, and the target shared bike comprises the shared bike requested by the bike-use request; generating feedback information for the bike-use request, and transmitting the feedback information to the terminal; and receiving confirmation information on the feedback information transmitted by the terminal, and transmitting an unlocking instruction to the target shared bike.