Package sewage treatment plant
Package sewage treatment plants are more sophisticated than septic tanks – they’re more like mini versions of the sewage treatment works owned by water companies and dotted around the country. Most of these plants need an electrical supply, and you can often see a larger cover above ground. The sewage is biologically treated within the plant – this process allows bacteria to grow. This bacteria then breaks down the sewage, resulting in a treated effluent that can be released straight into a watercourse (subject to certain conditions).
Just like a septic tank, package sewage treatment plants need to be regularly emptied, and also serviced.