Hospital Sewage Treatment Process

Learn about the hospital sewage treatment process, including process selection principles, primary and secondary treatment technologies, and disinfection requirements. This guide explains how to design effective wastewater treatment systems for hospitals and infectious disease facilities to meet environmental and safety standards.

Hospital wastewater contains a wide range of pollutants such as pathogens, pharmaceuticals, disinfectants, and organic matter. If discharged untreated, it can pose serious threats to public health and the environment.
los hospital sewage treatment process is designed to remove contaminants, disinfect pathogens, and ensure that treated water meets local or national discharge standards. Treatment methods vary depending on hospital type, capacity, and discharge destination — typically into natural water bodies o municipal sewage systems.

The selection of a hospital sewage treatment process depends on three major factors:

1. Type of hospital – infectious disease hospital or general hospital.
2. Treatment scale and budget.
3. Destination of treated effluent – whether it enters a municipal sewer or natural water body.

Process Selection Guidelines:

• Infectious disease hospitals: Must adopt secondary treatment and include pre-disinfection before biological processes.
• County-level or larger hospitals discharging into natural water bodies: Require secondary biological treatment to remove organic pollutants and pathogens.
• General hospitals connected to municipal sewage treatment plants: Should use at least enhanced primary treatment or preferably secondary treatment to reduce organic load before discharge.
• Small hospitals in underdeveloped regions: Can apply simple biochemical treatment as a transitional measure, upgrading to full secondary treatment when feasible.

These principles ensure environmental compliance and safeguard community health.

Enhanced primary treatment improves the removal of suspended solids (SS), organic matter, and pathogen-carrying particles before disinfection.
For general hospitals without infectious wards, the recommended process flow is:

Pretreatment → Enhanced Primary Treatment → Disinfection

• Pretreatment: Wastewater passes through a septic tank y adjustment tank equipped with an automatic screen to remove large debris.
• Coagulation and Sedimentation: Coagulants are added to aggregate fine particles for efficient sedimentation.
• Disinfection: The clarified water flows into a contact tank, where chemical disinfectants (such as chlorine) or UV systems inactivate pathogens.
• Sludge Handling: Sludge and screenings are disinfected and safely disposed of (by lime addition or pasteurization).

• Enhanced particle removal improves disinfection efficiency.
• Reduces the required amount of disinfectant, minimizing chemical pollution.
• Uses existing infrastructure (e.g., septic tanks) to lower investment costs.

Suitable for general hospitals that discharge wastewater into municipal sewage systems where further secondary treatment is available.

los secondary treatment process integrates biological treatment and disinfection to achieve higher removal of CODcr, DBO5, and pathogens.
Flujo de proceso típico:

Adjustment Tank → Biological Oxidation Tank → Contact Disinfection

1. Adjustment Tank: Collects wastewater from septic systems; includes a grille and lifting pump.
2. Biological Oxidation: Uses aerobic biological processes (such as activated sludge, contact oxidation, or membrane bioreactor (MBR)) to degrade organic matter.
3. Disinfection: Treated effluent enters a contact disinfection tank for pathogen removal.
4. Sludge Disposal: Sludge and grit are disinfected and incinerated or properly handled.

For infectious disease hospitals, special measures are applied:

• Separate collection of sewage and feces.
• Pre-disinfection tanks before entering the biological system.
• Closed treatment facilities with unified ventilation and UV air disinfection systems for exhaust gases.

• Effectively removes DBO5, BACALAO, and pathogenic microorganisms.
• Biological units such as MBRs o aerated biofilters enhance suspended solids removal and improve effluent clarity.
• Ensures stable and compliant effluent quality, even with fluctuating influent loads.

Applicable to:

• Infectious disease hospitals
• General hospitals with infectious wards
• Facilities discharging directly into natural water bodies

For small hospitals in rural or underdeveloped regions, a simplified biochemical process can be applied:

Biogas Purification Tank → Disinfection

los biogas purification tank includes:

• Solid-liquid separation zone – removes suspended solids.
• Anaerobic filter zone – degrades organic pollutants through microbial action.
• Sedimentation filter zone – ensures final polishing of the effluent.

Biogas produced during treatment can be collected and used as fuel o burned off safely depending on quantity.

• Utilizes anaerobic digestion for organic matter degradation.
• Low operational cost, minimal power use, and simple maintenance.
• Produces less sludge and can generate renewable biogas energy.

Ideal for small or rural hospitals as an interim solution, with plans for upgrading to secondary treatment as resources become available.

los hospital sewage treatment process must be selected based on hospital type, capacity, and discharge destination.

• Infectious disease hospitals require comprehensive secondary biological treatment with strict disinfection.
• General hospitals connected to municipal treatment systems can use enhanced primary or secondary treatment.
• Small rural hospitals may adopt simple biochemical treatment as a temporary measure.

Regardless of scale, the goal remains consistent — to protect public health and the environment by ensuring that all hospital wastewater is treated safely and effectively.

A1: Primary treatment focuses on removing solids and improving disinfection, while secondary treatment adds biological oxidation to remove organic matter and achieve higher purification levels.

A2: Pre-disinfection prevents pathogens from spreading within the sewage system and protects treatment staff and downstream facilities.

A3: Common methods include chlorine disinfection, ultraviolet (UV) disinfection, and ozonation, depending on facility size and local standards.

A4: Most countries follow national or regional standards equivalent to CJ/T3028.1-94 or the WHO Guidelines for Safe Management of Wastes from Health-Care Activities.

A5: Yes, if treated correctly. When biogas output exceeds 15 m³ per m³ of sludge, it can be captured and reused for heating; otherwise, it should be burned safely.

Xian CHIWATEC Water Treatment Technology es una empresa de alta tecnología especializada en varios dispositivos de procesamiento de agua. Aparte de estos productos individuales, que cubren una serie de tipos y series, también podemos ayudar con proyectos de ingeniería integrales relacionados. Gracias a nuestro arduo trabajo y dedicación desde nuestra fundación, ahora somos uno de los fabricantes de equipos de tratamiento de agua de más rápido desarrollo en el oeste de China.

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