The printing industry is a very large industry which produces very different products such as books, daily news-papers, periodicals, packaging, cartons, drink containers, signs, forms, brochures and so on. Basically the printing process involve four different steps: typesetting of text and artwork, imaging, printing and finishing.
| Composition of wastewater: |
Ink waste contains chemicals such as chromium, barium and lead and may be contaminated with cleaning solvents such as trichloroethylene, methylene and chlorine. In addition Wastewater from cleaning printing equipment include spent organic solvents such as trichloroethylene, methylene chloride, carbon tetrachloride, acetone and methanol. Wastewaters from developing negatives and prints include photochemical solutions from fixers, rinse water and alkaline or acid process baths.
| Wastewater treatment: |
In order to remove the pollutants of the printing wastewater Lenntech can deliver several kinds of technologies: