Electric Civil/msfrp Commercial Tertiary Treatment STP Plant

A Commercial Sewage Treatment Plant (STP) with Tertiary Treatment provides advanced wastewater purification beyond primary and secondary treatments, ensuring highly clean effluent suitable for sensitive discharge environments or reuse in non-potable applications such as irrigation, landscaping, or industrial processes.

What is Tertiary Treatment in STP?

Tertiary treatment is the last phase in sewage treatment and focuses on polishing the effluent further to remove contaminants like fine suspended solids, nutrients (nitrogen, phosphorus), pathogens, color, and odors that primary and secondary stages cannot fully eliminate.

Common Tertiary Treatment Processes:

• Filtration: Using sand, activated carbon, or membrane filters (microfiltration, ultrafiltration) to catch fine particles and residual solids.

• Disinfection: Chlorination, ultraviolet (UV) light, or ozone to kill pathogens and ensure microbial safety.

• Nutrient Removal: Biological or chemical processes to reduce nitrogen and phosphorus, preventing eutrophication in receiving water bodies.

• Advanced Oxidation: Used to break down persistent organic pollutants and reduce color and odors.

• Polishing Ponds or Lagoons: Natural or constructed wetlands providing secondary polishing.

Benefits of Tertiary Treatment:

• Produces high-quality effluent with BOD, COD, TSS drastically reduced (often BOD < 10 mg/L).

• Enables treated water reuse, supporting sustainable water management.

• Protects sensitive ecosystems by meeting stringent discharge norms.

• Removes nutrients and pathogens preventing water pollution and health risks.

• Enhances treatment reliability and environmental compliance.

Application in Commercial STPs:

• Shopping malls, hotels, complexes needing high-quality treated water.

• Industrial parks and commercial buildings aiming for water reuse or zero liquid discharge.

• Facilities in ecologically sensitive areas requiring advanced effluent treatment.

Summary Table:

Tertiary treatment in commercial STPs ensures superior effluent quality, enabling safe discharge or reuse, which is increasingly vital for sustainable urban water management and compliance with strict environmental standards.