Case Study: ETP for Medical College/Hospital, with design basis, PFD
Effluent treatment plant (ETP) is a crucial component in any medical college and hospital to ensure that the wastewater generated from various activities in the facility is treated before being discharged into the environment. The effluent from the medical college and hospital can contain hazardous and infectious materials, making it essential to treat it before release.
In this blog, we will discuss the process flow diagram, design basis, and a real-time case study on designing an effluent treatment plant for a medical college and hospital.
The design basis for an effluent treatment plant in a medical college and hospital should consider the following parameters:
- Flow rate: The effluent flow rate from the medical college and hospital should be determined based on the daily water consumption and other factors.
- Contaminants: The effluent from the medical college and hospital can contain various contaminants such as organic and inorganic compounds, pathogens, and pharmaceuticals. The treatment process should be designed to remove or reduce these contaminants to acceptable levels.
- Standards: The effluent discharge standards should be considered when designing the effluent treatment plant. The discharge standards are set by the local regulatory authority and can vary depending on the location.
Process Flow Diagram:
The process flow diagram for designing an effluent treatment plant for a medical college and hospital is shown in the image below:
Real-Time Case Study:
Let us consider the case of a medical college and hospital located in a suburban area. The wastewater generated from various activities in the facility is treated in an effluent treatment plant with a capacity of 50,000 liters per day (LPD).
The effluent treatment plant consists of the following stages:
- Collection Tank: The wastewater generated from various activities in the facility is collected in a collection tank with a capacity of 50,000 liters.
- Screening and Grit Removal: The wastewater is screened using a rotary screen to remove large particles, and then sent to the grit chamber to remove sand and grit.
- Primary Treatment: The wastewater is then sent to the primary treatment stage, where the suspended solids are removed through sedimentation and the organic matter is removed through anaerobic digestion.
- Secondary Treatment: The wastewater is then sent to the secondary treatment stage, where it is treated with an activated sludge process, which removes the organic matter and nutrients.
- Tertiary Treatment: The tertiary treatment stage involves the use of advanced treatment methods such as sand filtration, UV disinfection, and ozonation to remove the remaining contaminants and ensure the effluent meets the discharge standards.
- Sludge Treatment: The sludge generated from the primary and secondary treatment stages is treated using a sludge dewatering system, which involves the use of a belt press to remove the water from the sludge.
- The effluent treatment plant is designed to meet the discharge standards set by the local regulatory authority. The discharge standards for this particular medical college and hospital state that the effluent should have a pH value between 6.5 and 8.5, a total suspended solids (TSS) concentration of less than 30 mg/L, and a biological oxygen demand (BOD) concentration of less than 30 mg/L.
- The effluent treatment plant has been operational for over five years and has been successful in treating the wastewater generated from the medical college and hospital. The treated effluent is discharged into a nearby river, which is a source of water for agricultural purposes. The discharge of treated effluent has not caused any adverse effects on the environment or human health.
Designing an effluent treatment plant for a medical college and hospital requires careful consideration of various factors such as flow rate, contaminants, and discharge standards. The process flow diagram for designing the effluent treatment plant involves various stages such as screening, primary treatment, secondary treatment, tertiary treatment, and sludge treatment. The effluent treatment plant must be designed to meet the discharge standards set by the local regulatory authority to ensure that the treated effluent does not cause any harm to the environment or human health.
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