Septic tanks are an outdated method of sewage disposal.
They produce an effluent that is very polluting to the environment.
Septic tank effluent must never be allowed to enter a ditch or stream as it will strip the oxygen out of the water, killing aquatic life.
Septic tanks need a soakaway drainfield, which is usually over 100M3 per house and all of it must be at least 15M from any building. Most houses don't have big enough gardens to fit them in and they are also very expensive to install.
If you have access to a ditch or stream, then a sewage treatment plant is a much better and cheaper option.
Sewage Treatment Plants
A sewage treatment plant is the modern way to treat wastewater and sewage.
Sewage treatment plants produce a liquid that is non-polluting and which resembles clear water. They can discharge directly to a ditch, stream or river without harming fish and other wildlife.
They achieve this by utilising millions of friendly aerobic (oxygen breathing) bacteria which digest the organic pollutants in the sewage and wastewater.
Which sewage treatment plant is the best?
There is no such thing as the 'Best' sewage plant. It depends how they are going to be used. Some plants do not work well if they are very underloaded, some do. Some plants die if they are left for any length of time without use, others continue to survive for weeks. There are many different types of sewage treatment plants and many manufacturers are economical with the truth about their plants' capabilities.
There are 6 important things to consider when buying a sewage treatment plant.
- The tank warranty period. A minimum 5 year tank warranty is essential. Some have only 12 months, which is not enough to protect you.
- Internal moving parts. Sewage is corrosive, so a sewage plant with no internal metal moving parts is an advantage.
- Electricity consumption. The most efficient 6 person sewage plant uses only 34 watts/hour, whilst the least efficient one uses 135 watts/hour.
- The blower should be housed outside the tank. Inside the tank, the humidity is 100%. Water and electricity are not a good combination.
- Service and emptying intervals. These vary from 3 monthly to annual.
- A tank which has a one-piece construction. Avoid tanks that are made in two halves and joined together. Even the best seals will fail eventually.
You have some work to do as well. See steps to take for a successful sewage installation