The urban environment has made progress in the safe treatment of printing and dyeing sludge using pyrolysis technology

With the rapid process of industrialization, the amount of printing and dyeing sludge is increasing year by year. According to the China Environmental Statistics Yearbook, the amount of printing and dyeing sludge produced in China in 2016 was 4.65 million tons. The composition of printing and dyeing sludge is very complex, rich in polycyclic aromatic hydrocarbons, heavy metals, surfactants, dyes, solvents, detergents and other compounds. Among them, the nitro and amino compounds and heavy metal elements in the dyes are hazardous wastes and have strong biological toxicity. Therefore, if the printing and dyeing sludge is not handled properly, it will cause serious harm to the ecological environment and human health. At present, domestic and foreign treatment and disposal of printing and dyeing sludge mainly refer to municipal sludge treatment and disposal methods (land use, landfill and incineration). Each of these treatment methods has its shortcomings, and it is easy to cause secondary pollution. It can be seen that there is still a lack of safe and reliable printing and dyeing sludge treatment and disposal technology.

The Clean Energy Technology and Carbon Materials Research Group (Wang Yin team) of the Institute of Urban Environment, Chinese Academy of Sciences aimed at the current problems of complex composition, strong biological toxicity and high pollutant content in printing and dyeing sludge. The research on migration and transformation of heavy metals and chemical form transformation in the process of sludge pyrolysis has clarified the migration and transformation rules and chemical form transformation mechanism of heavy metals in printing and dyeing sludge. The study found that printing and dyeing sludge pyrolysis technology can promote the transformation of most heavy metals from unstable bioavailable state to stable residue state. The heavy metals enriched in biochar are mainly solidified in the biochar matrix, resulting in printing and dyeing sludge The environmental risk of biochar is greatly reduced. In addition, as the pyrolysis temperature continues to increase, the quality of the prepared bioprinted sludge biochar also significantly improved. The research results provide a theoretical basis for the recycling and harmless disposal of printing and dyeing sludge, and also provide some references for the subsequent safe application of pyrolysis end product printing and dyeing sludge biochar.

The research results were published on Ecotoxicology and environmental safety with the title of Effect of pyrolysis temperature on characteristics, chemical speciation and risk evaluation of heavy metals in biochar derived from textile dyeing sludge. The research was funded by the China-Japan Government International Science and Technology Innovation Cooperation Key Project (2016YFE0118000), the National Natural Science Foundation of China (41373092), Tianjin Key R & D Program Project (16YFXTSF00420), and the Chinese Academy of Sciences Frontier Key Project (IUEQN201501).

Pyrolysis and safe treatment technology for printing and dyeing sludge

China PVC Corner Bead,Fiberglass Mesh Corner Bead manufacturer, choose the high quality Fiberglass Corner Bead,PVC Drywall Corner Bead, etc.

Corner Bead

PVC Corner Bead,Fiberglass Mesh Corner Bead,Fiberglass Corner Bead,PVC Drywall Corner Bead

HEBEI TUOHUA METAL PRODUCTS CO.,LTD , https://www.penettings.com