If your sewage treatment plant smells, there are a number of things that should be checked. It would be helpful to also understand what you should not put into a treatment plant as some things will harm or kill bacteria.
A smelly sewage treatment plant is not pleasant. But there are a number of things that can be done to improve matters. As each site is different, the cause can be a number of things. Booking an experienced engineer to asses your treatment plant would be our number one tip. Do not put yourself at risk by entering the treatment plant or trying to fix any electrical equipment.
When faced with a sewage treatment plant that smells, you have a few different options, including servicing, better ventilation, and even investing in a new plant if your old system is no longer fit for purpose.