Kids coloring comic book "Travel to the aeration tank" will introduce the biological wastewater treatment process. The plot of the comic book coloring included 10 consecutive scenes about what happens in the aeration tank at the WWTP and how bacteria used in wastewater.
The PDF file is available for download on the link.  You can print the coloring on any printer, the files are prepared for printing on A4 paper standard.
The heroes of the comic coloring book can open the door to the fascinating world of the science of chemistry for their young readers. After all, the appearance of the characters corresponds to the structural (graphic) formulas of chemical compounds. Visual perception of information and associative memory will help in the future, in chemistry lessons, to easily learn formulas.

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