SUNYaquan,YANGMing,WUQiong,et al.Design of Disinfection Contact Tank for a Water Treatment Plant in the Philippines[J].China Water & Wastewater,2026,42(12):107-112.
Design of Disinfection Contact Tank for a Water Treatment Plant in the Philippines
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第42卷
Number:
第12期
Page:
107-112
Column:
Date of publication:
2026-06-17
- Abstract:
- In Chinese water supply projects, disinfection contact tank design is often based on empirical parameters, which may not adequately address the simultaneous requirements for reliable disinfection performance, verifiable hydraulic behavior, and operational safety under maintenance conditions. Taking a surface water treatment plant in the Philippines with a design capacity of 22×104 m3/d as an engineering case, this study systematically investigates the process layout, hydraulic performance, operational safety, and disinfection effectiveness of a disinfection contact tank under the requirements of relevant US standards and the employer’s standard engineering specifications (SES). Focusing on key issues such as determination of disinfection contact time, tank compartmentalization, internal baffle arrangement, and overflow system design, a four-compartment disinfection contact tank scheme allowing independent operation of each compartment is proposed in accordance with standard requirements and engineering conditions. Hydraulic calculations and CFD numerical simulations were conducted to comparatively analyze flow characteristics under different channel layout configurations, and the internal flow distribution and baffle structures were optimized, enabling the overall hydraulic behavior of the disinfection contact tank to approach that of an ideal plug-flow reactor. On this basis, a CT-based disinfection performance evaluation was carried out in accordance with the US Surface Water Treatment Rule (1995 version).The results indicate that, under the single-point chlorination condition at the filter effluent pipeline, the actual CT value of the system satisfies the inactivation requirements for Giardia lamblia and viruses, while ensuring stable and controllable residual chlorine in the treated water. The proposed design meets disinfection performance requirements and significantly enhances operational reliability and safety under maintenance conditions, and may provide a useful reference for the design of disinfection contact tank in water supply projects adopting international standards.
Last Update:
2026-06-17