Disinfection

During the disinfection of treated wastewater, remaining microorganisms and pathogens are specifically inactivated. This significantly improves the hygienic quality of the effluent. Depending on the treatment process and specific requirements, the disinfected wastewater can subsequently be reused as process water. This recycling reduces the demand for fresh water and conserves valuable water resources. The reuse of wastewater offers both ecological and economic advantages, particularly in water-scarce regions.

Various methods are available for wastewater disinfection. Established techniques include, most notably, chlorination and UV irradiation, each offering distinct advantages depending on the specific operating conditions.

 

Chlorination:

In this process, a chlorine-based disinfectant is added to the treated wastewater to kill or inactivate remaining microorganisms. The method is characterized by relatively low technical complexity and low investment costs.

Furthermore, any residual chlorine can provide a degree of protection against recontamination.

However, dosage and contact time must be carefully calibrated, as unsuitable operating conditions can lead to the formation of undesirable—and potentially toxic—disinfection by-products.

 

UV Irradiation:

UV disinfection serves as an alternative to chemical treatment. In this process, microorganisms are inactivated by ultraviolet radiation, eliminating the need for the addition of chemical disinfectants.

To ensure reliable disinfection, both UV intensity and exposure duration must be adjusted based on water quality and flow rate.

Adequate pre-treatment is also crucial, as turbidity (suspended particles) can impair the effectiveness of the irradiation.

CUSS GmbH develops tailored wastewater disinfection solutions, designed to meet specific effluent quality requirements and the intended reuse of the treated water.