Potential sources of pollution in polyamide processes

Usually, batch processes have a greater impact on the environment, due to the starting up and closing down procedures of each single production. 

The processes require both electrical and lliermal energy, steam and heat transfer media (HTM) as well as cold water for the heating, ventilation and air conditioning system (HVAC) in the case of spinning processes. The installation of a cogeneration plant can optimise the use of energy, but it affects the amoimt of gaseous emissions from the production site. 

In both cases, the pollutants are suitable for a biological waste water treatment, but this process has to be fully integrated with both bionitrification and biodenitrification. 

Waste water can also be recycled after biological treatment and membrane filtration [www.dupont.zenit.de]. 

The emissions of HTM have to be filtered, normally with activated carbon. The combustion fumes emitted by the HTM and steam boilers also have to be considered. 

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