Over 2 million tons of chromate residues as hazardous wastes have been accumulated from chromate production processes during the past more than 30 years in China. Some serious pollution problems have been caused due t...Over 2 million tons of chromate residues as hazardous wastes have been accumulated from chromate production processes during the past more than 30 years in China. Some serious pollution problems have been caused due to no appropriate technology and management. Approaches are reviewed to pollution control of chromate residues by utilizing them as secondary resources in this paper. In addition to legislation for pollution control, chromate residues can be used as raw materials to produce a great diversity of useful industrial products. Strategies are also recommanded for the resourcefulization of chromate residues.展开更多
Leather industry is an important light industry in China.Leather making requires a series of chemical treatment.Degreasing,unhairing and chrome tanning wastewaters are the main portions of tannery wastewater.Reclaimin...Leather industry is an important light industry in China.Leather making requires a series of chemical treatment.Degreasing,unhairing and chrome tanning wastewaters are the main portions of tannery wastewater.Reclaiming and reusing these wastewaters can eliminate 80% of COD,75% of BOD,95% of chromium and 93% of sulfuret,furthermore reduce environment impact,decrease treatment costs,save chemicals and water.Some application methods of wastewater reclamation and reuse for different operations were reported.The suitable reclamation and reuse technologies can enable leather making processes more rational,and realize the recovery and recycle of several chemicals in the tannery.Resourceful utilization of tannery wastewater should mate with renovating production technology,updating equipment,and must be guaranteed sufficiently by environmental protection measures.展开更多
The resource advantage of resourceful region has made the region develop very fast. However because the resource is of exhausting character, this means that the region has hidden troubles of economic depression. The p...The resource advantage of resourceful region has made the region develop very fast. However because the resource is of exhausting character, this means that the region has hidden troubles of economic depression. The paper analyzes the formation of resourceful region and the law of resourceful regions economic development, and then the paper brings forward that the resourceful region has a potential danger of economic depression. Considering Chinas economic development practice, the paper puts forward a basic way of thinking. That is: we must attach importance to the problem of industrial structure when we pay attention to existing resource advantage in order to avoid the simplification of regional industrial structure and to avoid entering a vicious cycle.展开更多
文摘Over 2 million tons of chromate residues as hazardous wastes have been accumulated from chromate production processes during the past more than 30 years in China. Some serious pollution problems have been caused due to no appropriate technology and management. Approaches are reviewed to pollution control of chromate residues by utilizing them as secondary resources in this paper. In addition to legislation for pollution control, chromate residues can be used as raw materials to produce a great diversity of useful industrial products. Strategies are also recommanded for the resourcefulization of chromate residues.
文摘Leather industry is an important light industry in China.Leather making requires a series of chemical treatment.Degreasing,unhairing and chrome tanning wastewaters are the main portions of tannery wastewater.Reclaiming and reusing these wastewaters can eliminate 80% of COD,75% of BOD,95% of chromium and 93% of sulfuret,furthermore reduce environment impact,decrease treatment costs,save chemicals and water.Some application methods of wastewater reclamation and reuse for different operations were reported.The suitable reclamation and reuse technologies can enable leather making processes more rational,and realize the recovery and recycle of several chemicals in the tannery.Resourceful utilization of tannery wastewater should mate with renovating production technology,updating equipment,and must be guaranteed sufficiently by environmental protection measures.
文摘The resource advantage of resourceful region has made the region develop very fast. However because the resource is of exhausting character, this means that the region has hidden troubles of economic depression. The paper analyzes the formation of resourceful region and the law of resourceful regions economic development, and then the paper brings forward that the resourceful region has a potential danger of economic depression. Considering Chinas economic development practice, the paper puts forward a basic way of thinking. That is: we must attach importance to the problem of industrial structure when we pay attention to existing resource advantage in order to avoid the simplification of regional industrial structure and to avoid entering a vicious cycle.
