Chemical processes in the treatment of sewage

Chemical processes in the treatment of sewage

Chemical processes used in sewage treatment are designed to apply certain chemical reactions. These processes are always used in conjunction with physical and biological process units. In general, chemical process units have disadvantages in relation to physical processes in action. One of these disadvantages is the addition of additional pollution to the sewage and its volume increase, as well as potentially harmful effects in the water. The chemical unit can include chemical treatments, absorption, disinfection, chlorination, and other steps. If we want to compare the efficiency of each of the chemical treatment and deposition processes, the information in this comparison is well presented in the table below.

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The advantages of the chemical method in coagulation include higher purification efficiency, ease of use of high jerane levels and higher compatibility. At the same time, the coagulation process leads to high levels of primary sludge, which is difficult to absorb and reduce. Also, this high-performance process requires more attention to process control.

 Different methods of flotation 

Delete percentage
Measured factor Physical Detection Chemical treatment
Total suspended solids 40 to 90 60 to 90
BOD 5 25 to 40 40 to 70
COD 30 to 60
Phosphorus 5 to 10 70 to 90
Microbial load 50 to 60 80 to 90


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