Municipal Water Supply
Ozone Water Treatment for Municipal Drinking Water
Oxidation, taste and odor control, disinfection and support for downstream biological filtration.
Application conditions determine the final process, ozone dose and equipment configuration. Start with the treatment objective and actual project data.
Is this solution right for your project?
Oxidation, taste and odor control, disinfection and support for downstream biological filtration.
Final ozone dosage and process configuration depend on actual process conditions. Difficult or variable streams may require laboratory or pilot testing before final design.
Application Overview
Ozone can be applied at different points in a drinking-water treatment train for oxidation and disinfection. The correct injection point and dose depend on source-water quality, bromide, organic matter, downstream filtration and the required local drinking-water standard.
Design basis and practical limits
A defensible ozone process starts with representative project data. These inputs should be confirmed before equipment output or dosage is finalized.
Design inputs to provide
- Plant flow and hourly operating profile
- Source-water TOC, UV254, bromide, pH and temperature
- Taste, odor, color, algae or disinfection objectives
- Target ozone dose, contact conditions and downstream BAC design
- Required drinking-water standard and residual disinfectant strategy
Place ozone at the correct treatment stage
Pre-ozonation and post-ozonation serve different objectives. Injection points must be selected with coagulation, filtration, BAC and the required disinfection contact stage in mind.
Control bromate risk
Where bromide is present, bromate formation must be evaluated through water chemistry, dose, pH, contact time and the applicable drinking-water limit. A generic ozone dose is not sufficient.
Treat Ozone-BAC as one process
Ozone changes organic matter before biological activated carbon. Ozone dose, biodegradability, BAC loading and backwash strategy should therefore be reviewed together.
What Ozone Solves
- Oxidation of selected taste, odor and color compounds
- Disinfection within a validated contact stage
- Potential support for downstream biological filtration
- On-site generation with no bulk ozone storage
Typical Process Flow
- 1Pre-ozone contact chamber
- 2Flocculation pool
- 3Horizontal flow sedimentation tank
- 4Sand filtration tank
- 5Post-ozone contact chamber
- 6BAC filtration tank
- 7Clear water tank
Typical Complete System Scope
A project is sized as a coordinated treatment system, not as an isolated ozone generator. The final boundary varies by application and site.
- Feed-gas preparation or oxygen supply
- Ozone generation
- Cooling and process instrumentation
- Application-specific dosing or distribution
- Contact or reaction stage
- Residual ozone and off-gas management
- Safety monitoring and control
Data Needed for Preliminary Sizing
- Treatment flow rate and operating hours
- Influent water, gas or process characteristics
- Target pollutant and required outlet standard
- Existing process flow and available contact space
- Available feed gas, cooling water and electrical supply
- Site temperature, pressure and installation conditions
- Project country, schedule and applicable local requirements
Frequently Asked Questions
How is the required ozone capacity determined?
Capacity for municipal drinking water cannot be selected from flow rate alone. Preliminary sizing considers treatment flow, ozone demand, target result, contact conditions, transfer efficiency and operating hours. Variable or difficult streams may require laboratory or pilot testing before final design.
Should air, PSA oxygen or liquid oxygen be used as the feed gas?
The choice depends on required ozone output and concentration, operating profile, utilities, site space and local oxygen cost. Oxygen-fed systems generally support higher ozone concentration; the most economical option must be compared at complete-system level.
Can ozone be added to an existing treatment line?
Often yes, but a retrofit review is required. The engineer must check the injection point, hydraulic or gas conditions, contact time, materials compatibility, off-gas handling, controls, interlocks and the effect on downstream processes.
Is an off-gas destructor or residual-ozone control required?
It is commonly required where unreacted ozone may leave a contact vessel or enter an occupied area. The final arrangement depends on the process and local safety rules, but ozone generation, transfer and destruction should be treated as one engineered safety boundary.
What maintenance does an ozone system require?
Routine work normally includes checking feed-gas quality, cooling, filters and dryers, ozone monitors, valves, seals, electrical protection and the dosing or off-gas system. The exact schedule depends on equipment configuration, duty cycle and site conditions.
What information is needed for a preliminary proposal?
Send the treatment flow, operating hours, influent data, treatment target or outlet standard, existing process, available utilities, installation country and project schedule. We will first define the treatment boundary and then recommend a preliminary system configuration.
Related project references
The capacities below are documented project references. Final treatment performance depends on project-specific water quality and process conditions.
Shanghai Water Plant
Drinking water advanced treatment
20 kg/h
View project detailsJinan Water Plant
Drinking water advanced treatment
20 kg/h
View project detailsWujiang Water Plant
Drinking water advanced treatment (O₃-BAC)
40 kg/h
View project detailsKunshan Water Plant
Drinking water advanced treatment
40 kg/h
View project details