A package treatment plant treats wastewater by removing physical, chemical, and biological pollutants by combining physical, chemical, and biological processes. Package sewage treatment plants are ideal for small townships, hotels, villas, and restaurants. Small sewage treatment facility serving a small or lower population, with little land area.
Producing treated wastewater (effluent) and solid waste (sludge) that can be recycled or disposed of in the open air are the main goals of a micro sewage treatment plant. The package plant has membrane filtration, biological treatment for suspended growth, and fine screening. For thorough treatment, ultraviolet disinfection is a simple addition to these systems.
Sewage treatment plants can be purchased as packages or as separate units. There are three stages in a small wastewater treatment plant: primary, secondary, and tertiary treatment.
1. Primary Treatment: This is applied before biological treatment. This process removes material that will either float or easily settle out by gravity. Sand, grit, eggshells, grease, and small plastic particles settle out of the water with the help of a grit chamber, which slows down the flow. These materials are then collected from a sedimentation tank, also known as the primary clarifiers. Primary sludge, which has settled, is pumped out to a sludge handler for disposal. About 60–70% of the suspended particulates are eliminated during this treatment, but the wastewater is still unfit for reuse, necessitating additional treatment. The secondary treatment system receives the wastewater from the first tank that has been partially treated.
2. Secondary Treatment: After undergoing primary treatment, treated wastewater is sent to the secondary treatment phase, where it performs biological and aeration treatments. It applies a technique known as the activated sludge process. The breakdown of organic matter and enhanced microbial growth occur when air is introduced to aeration tanks containing wastewater. The secondary clarifier, a settling tank where heavy materials settle and become secondary sludge, receives the aerated wastewater. A portion of it is routed back to the aeration tank, and the remainder is combined with primary sludge to be processed further in a device known as a sludge handler. Up to 80–90% of BOD is eliminated by the secondary treatment of small wastewater treatment plants.
3. Tertiary Treatment: Pre-treatment and tertiary treatment are usually not used in packaged sewage treatment plants. However, tertiary treatment is crucial for recycling wastewater or dumping it into watercourses. This type of therapy, often referred to as advanced treatment, can eliminate pollutants that secondary or primary treatment is unable to remove by the use of physical, chemical, biological, or other procedures. This treatment is also known as a disinfection treatment because it involves the disinfecting procedure. Either UV light or chlorine treatment can be used.
How Package STP (PSTP) Works
1) Sedimentation Chamber and Separation Box Domestic wastewater is collected in sedimentation and separation chambers. It also serves to separate liquid and solid waste according to how serious they are.
2) The Anaerobic Filter Chamber Sedimentation and separation chamber wastewater also enters the anaerobic media contact chamber. It has organic stuff in it that anaerobic microorganisms consume.
3) Relocating the Bed Chamber Water from the anaerobic chamber enters the moving bed (MBBR) chamber. Aerobic microorganisms break down organic material in wastewater to produce simpler products.
4) The Sedimentation Chamber A location for settled sludge is provided by the sedimentation chamber, and it is surrounded by biological activities in the moving bed (MBBR) chamber. The settled sludge will be moved to the chamber used for sedimentation and separation.
5) The Chamber of Disinfection The purpose of the disinfection chamber is to contain pathogenic microorganisms in waste that has been reused before being released into the environment or if further treatment is required, transferred for that purpose.
6) An airlift mechanism is used to ensure continuous recirculation of the built-in Rotation Line from the second sedimentation chamber to the separation and sedimentation chamber. This guarantees the denitrification process and constant water flow throughout the system while undergoing many treatments.
Package STP Operational Characteristics
- Innovative Technology
Designing this state-of-the-art packaged sewage treatment plant was done following statutory norms and Bangladesh conditions.
- Reduced Maintenance Cost
There is relatively little maintenance needed—1-2 hours per week should be enough. For Small and Mid Range Packaged Plants, operators are not necessary.
- Silent and without smell
The only times this boxed plant smells are when it needs maintenance. The sound level is below 50 dB.
- IOT enabled system
Remotely monitor STP operations with essential alarms, failure protection, etc.
- Fulfills Regulation Standards
These packaged sewage treatment plants are made in compliance with all the guidelines established by the most recent standards of the Pollution Control Board.
- Proof leak
Modern gear is used in the production of the FRP tanks, which receive individual pre-testing to ensure leak resistance.
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Package STP Applications
- Land development, residential subdivisions,
- Small and medium-sized towns,
- Mobile home parks,
- Remote logging, mining, and construction sites,
- Parks, campgrounds, marinas, and recreational places,
- Manufacturing plants, power plants, and military locations
- Educational institutions and campuses
- Public buildings
- Applications combining high flow and low strength
- Low flow and high strength
- Biological treatment of wastewater for industrial flows Return to Top
Package STP Advantages
- Cost savings from pre-engineered, pre-fabricated structures
- Easy transportation of the unit to the customer’s project site
- Fast turnaround times for delivery and installation
- The treatment system requires little labor and is easy to operate
- Low maintenance requirements and effective extended aeration principle
- Regulatory compliance
- Custom design/application specific systems
- Long service life
