What’s the Purpose of Septic Tanks?

If you’re constructing a house, you need to hire plumbing professionals to build you a septic tank. But what is a septic tank and what does it do? There are actually four types of sewage tanks and they are determined according to their functions. The four kinds are the holding tank, septic tank, trash tank, and processing tank.

So when your plumber says sewage tank, he’s actually talking not just about the septic tank but also the other three types of tanks installed in your home. The special functions of these tanks are as follows:

1. Holding Tanks

Holding tanks are the basic kind of sewer tank. It is a system that’s usually installed as a last resort if a treatment system can’t be placed in the system. It’s commonly used during the system start-up phase and during instances where a complete installation of the sewage tank is not possible due to bad weather or for any other reason.

Holding tanks may be made of fiberglass, concrete, or polyethylene. The tank is a watertight vessel that stores sewage flow. But because they are temporary in nature, they have to be pumped periodically to manage the daily flows. These tanks merely act as storage and collection devices. All liquids and solids have to be removed when pumping. To prevent settling, mixing is necessary.

2. Septic tanks

Septic tanks are also watertight and are made of fiberglass, concrete, and plastic. Their job is to collect wastewater while also providing primary treatment. It separates solids from the wastewater in such a way the heavier solids will sink to the bottom of the tank while and the soap scum, oil, fats, and grease will float to the top.

There are inlet and outlet baffles installed in septic tanks to direct the flow to allow for separation and hold the scum in the tank. Septic tanks reduce the need for pumping. Even so, the tank may get full at one point and you’ll need septic tank pumping services. For that, you’ll have to talk to a certified plumber for more information.

3. Trash tanks

Trash tanks are the types of tanks that are not so popular but they work in a similar manner to septic tanks. They use the same materials and are also be watertight. These tanks are used prior to some type of advanced pre-treatment units. Their function is to serve as the collection point for large solids and other waste materials, like plastic products.

Trash tanks protect the system by keeping unwanted material from interfering with the operation. These tanks usually come in half the size of the installed septic tank. Manufacturers usually specify the size requirements of these tanks.

4. Processing tanks

Processing tanks are also watertight systems made with the same materials. These special tanks are designed to enhance nitrogen removal. They actually combine the functions of a pump tank, recirculating tank, surge storage tank, and septic tank.

The processing tank is where the waste is treated by adding ammonia to the water. That way, nitrogen gets converted to nitrate and then back again to nitrogen gas, which is released in the air. Such a process is called denitrification.