composite septic tank for wastewater is essentially a tank made up of various components. The main application of a composite septic tank is in wastewater treatment.
Components of Composite Septic Tank
The detailed components of these wastewater tanks include:
- Inlet system into the tank
- Primary tank where the wastewater is stored
- Clarifier tank where the wastewater is directed after treatment
- Partition wall separating the two tanks
- Biogas outlet system for venting excess gases
- Treated wastewater outlet system
Types of Septic Tanks
Composite septic tanks for wastewater have various applications and can be installed in places like factories, workshops, offices, restaurants, hotels, hospitals, residential buildings, etc. Due to their diverse applications, these tanks can be made from different materials. The different types include:
- Metal Composite Septic Tank: The wastewater tank is made of metal.
- Polyethylene Septic Tank
- Fiberglass Composite Septic Tank (Composite, GRP)
- Concrete Septic Tank
Technical Specifications of Composite Septic Tank
The technical specifications of composite septic tanks are determined individually for each customer based on regional standards, building size and type, building usage, and installation location. Generally, the technical specifications include the size of the inlet flange (inlet larger than 4 inches) and outlet flange (3 inches or more as per client requirements), the manhole cover on the septic tank (minimum 60 cm), the shape and dimensions of the composite septic tank (cylindrical, cubical, or custom shapes as per client orders or installation constraints), the location of inlets and outlets (based on the site’s plumbing plan), and the volume of the composite septic tank determined by the daily wastewater output.
Composite septic tanks typically have wall thicknesses ranging from 4 to 12 millimeters. Standard composite septic tanks may be constructed modularly and transported to the installation site, making transportation easier and allowing these systems to be installed in basements. Special rubber gaskets are used to seal modular tanks, offering excellent resistance to wastewater and ensuring the longevity of the composite septic tank.
Special resins used in the construction of composite septic tanks are chosen from the best manufacturers of vinyl ester and polyester resins to withstand chemical fluctuations in the wastewater without damage. The outlet of the composite septic tank produces clear, odorless, and pollution-free water that meets relevant environmental standards.
Price of Composite Septic Tank
The price is directly related to the volume and efficiency of the septic tank. Composite septic tanks are cost-effective due to their long lifespan, good environmental resistance, and minimal maintenance needs. However, concrete and plastic septic tanks may also be considered based on project requirements.
Standard-shaped and dimensioned septic tanks offer lower prices and better quality. Standard septic tanks are manufactured in factories and delivered as complete units or modular assemblies for on-site installation, reducing costs and improving quality. However, custom-designed tanks with specific dimensions or shapes may incur higher costs due to the need for more raw materials and custom molds.
On-site construction of composite septic tanks can be expensive but is sometimes necessary due to project constraints. It should be noted that larger composite septic tanks are more cost-effective by volume, so using one large tank instead of several smaller ones is recommended where feasible. During building design, space should be allocated for septic tank installation to avoid the need for more expensive options and achieve the best quality at the lowest cost.
Septic Tank Design
The typical design of a septic tank is cylindrical or cubic with dimensions of 4 meters by 4 meters and a length of 3 to 12 meters. Since each building has specific requirements, designs are usually provided by the client. Septic tanks can be constructed in any design and size, but lengths over 12 meters are generally not recommended. For larger projects, multiple parallel septic tanks are suggested.
Septic tanks longer than 12 meters are rarely needed except in very large projects. When designing the septic tank layout, it is important to consider the appropriate locations for inlets and outlets, the height of inlets and outlets relative to pumps and mechanical equipment, proper ventilation, and adequate air supply to the septic tank.
To prevent contamination, the design should minimize exposure to polluted areas. Proper design and implementation of septic tanks improve environmental hygiene and prevent the spread of bad odors and pollution. Consulting experts during the design phase is recommended for optimal results.
Good design can also reduce costs and the final price of the septic tank. Constructing a septic tank after the building is completed can result in additional expenses for the client. Where possible, septic tanks should be placed away from buildings and near the surface, but installing septic tanks in building basements is also feasible.
Calculating Septic Tank Volume Based on Wastewater Production
To calculate the volume of the septic tank, the incoming wastewater volume must first be assessed. For example, in a residential building, the number of residents is calculated, and then the wastewater volume is determined using urban wastewater production tables.
For volumes below 6 cubic meters, the tank volume is typically 1.5 times the incoming wastewater volume.
For larger volumes, the following formula is used:
V=4500+0.78Q
= Daily wastewater input volume
= Minimum volume of the septic tank
This means the septic tank volume equals the average daily wastewater output multiplied by 0.78 plus a fixed 4500 liters. The tank should have a minimum capacity of 4500 liters to allow the wastewater to settle and ensure proper anaerobic bacterial growth for solid to liquid conversion.
| Location | Unit | Consumption Range (Liters per Day) | Average (Liters per Day) |
| Urban Residential Units | Person | 150-80 | 120 |
| Recreational Villas | Person | 200-120 | 150 |
| Office Buildings | 8-hour Shift Staff | 60-30 | 50 |
| 24-hour Shift Staff | 100-70 | 90 | |
| Factories and Workshops | 8-hour Shift Worker | 60-30 | 50 |
| 8-hour Shift Worker with Shower | 120-90 | 110 | |
| Construction Sites | 8-hour Shift Staff | 80-40 | 60 |
| 24-hour Shift Staff | 120-80 | 100 | |
| Public WC | Person (without flush tank) | 12-5 | 7 |
| Person (with flush tank) | 20-12 | 15 |
Advantages of ABt Composite Septic Tanks
- Ready to install
- Durable
- Easy to transport
- Easy installation
- Corrosion resistance
- Crack resistance
- Environmentally friendly and compatible with soil and water
- Customizable in various shapes and sizes
- UV-resistan
Comparison of Composite and Concrete Septic Tanks
A septic tank is a crucial part of your plumbing system. If it malfunctions, it must be repaired or replaced immediately as it can disrupt the entire plumbing system. Septic tanks need to be replaced periodically due to wear and tear. The replacement choice depends on the tank’s features and material. Composite septic tanks, made from composite materials, are lighter than concrete ones, reducing the need for heavy equipment and lowering installation, maintenance, and repair costs. One drawback of concrete septic tanks is their tendency to leak or crack in cold climates, which makes composite septic tanks more favorable.
Concrete septic tanks have a longer lifespan than composite ones, but considering overall cost-effectiveness, composite tanks are recommended.
ABtank specializes in manufacturing composite tanks, GRP tanks, galvanized tanks, SMC tanks, modular tanks, and various polymer sheets. They produce composite septic tanks as one-piece or modular units, suitable for industrial use. Composite fiberglass septic tanks are designed and produced according to international standards and can store industrial and factory wastewater.For more information, consultation, price inquiries, orders, and purchases, please contact the number below.
