Aquaculture 0zone Disinfection System
Case description：
Analysis of Seawater Quality Components(Peru)
1. Pathogen (103CFU/ml): White spot virus (VSMB)/Subcutaneous and hematopoietic necrosis virus/Necrotizing liver bacteria (PNH)/Taura Syndrome Virus (VST)/General Vibrio species.
2. pH value: 7.5-8.6
3. SST: 30-75mg/L
4. Oil: 3mg/L
5. Temperature: 26-31 ° C
Design Content: Solution of a complete system for seawater filtration, disinfection, sterilization, and detection.
Design Objectives: Ensure that the seawater meets the standards for shrimp farming, effectively killing bacteria, viruses, fungi and other microorganisms in the water, and removing organic pollutants and odors. Processing water volume: 160m ³.
Challenge 1: How to effectively deal with the severe corrosion of seawater and ozone on system equipment?
To withstand the harsh marine environment, all system components and piping are constructed from materials highly resistant to both seawater corrosion and ozone.
The integrated system comprises three key units:
Seawater Filtration System
Micro-Nano Bubble Ozone Sterilization System
Monitoring System
Material Specifications:
Filtration System: Key components like lift pumps and wetted parts are made from duplex stainless steel. Unlike standard grades (304L, 316L), which are vulnerable to chloride-induced pitting and cracking, duplex steel offers superior strength and exceptional corrosion resistance for this demanding application. Filter vessels (sand and carbon) are constructed from fiberglass, and valves feature fluorine-lined bodies for maximum durability.
Ozone Sterilization System: Ozone is delivered via built-in PTFE (Teflon) piping, and the micro-nano bubble generator’s components use corrosion-resistant stainless steel.
Monitoring System: All probes are built with specialized corrosion-resistant materials to guarantee long-term stability and accuracy in seawater.
This comprehensive material selection ensures system integrity, minimizes maintenance, and provides reliable long-term operation.
Challenge 2: How to ensure the smooth installation and integration debugging of the entire system?
To ensure a smooth startup, every system is fully assembled and tested at our factory before shipment. On-site installation is straightforward, requiring only simple pipe and power connections.
We further simplify operation and maintenance through advanced support:
Remote Diagnostics: An optional remote module allows our engineers to perform real-time monitoring and troubleshooting directly.
Performance Logging: Each unit includes a performance log card that continuously tracks operational and maintenance data. For assistance, simply share this data with our support team for swift, accurate diagnostics.
Comprehensive Guidance: If you prefer not to use the remote module, we provide detailed instructional videos and documentation for installation and debugging.
This integrated approach eliminates the challenges of complex equipment operation and maintenance. With our proactive remote support and rapid solutions, we guarantee a truly worry-free ownership experience.
Principle of Filtration Treatment Process
1. Sand filter tank and carbon filter tank: filter suspended solids, particulate matter, etc. in water. Choosing a combination of quartz sand and activated carbon particle size can effectively remove suspended solids and particulate matter in water, as well as odors and colors in seawater.
2. Lift pump: Lift the water in the middle pool, the pump is a submersible lift pump, and the extraction medium is seawater. The control method of the water pump is liquid level type, specifically using a fixed floating ball type to adjust the water volume at any time, with high-level lifting and low-level stopping. The overall operation mode is controlled by the PLC control cabinet
Principle of Micro-nano Ozone Disinfection Treatment Process
1. Sterilization and disinfection principle
Ozone (O3) is a strong oxidant with a redox potential of up to 2.07V, second only to fluorine. When ozone dissolves in water, it can quickly decompose and produce new ecological oxygen [O]. New ecological oxygen has extremely strong oxidizing ability and can destroy the cell walls and membranes of bacteria, viruses, and other microorganisms, causing changes in their permeability and leakage of cell contents, leading to microbial death; It can also directly react with important biomolecules such as enzymes and nucleic acids in microbial cells, interfere with their normal physiological and biochemical functions, render them inactive, and prevent normal metabolism and reproduction, thereby achieving the purpose of sterilization and disinfection.
The micro nano bubble generator mainly breaks down the generated ozone gas into smaller bubbles for better dissolution and fusion with water.
The generation of micro nano bubbles is achieved by a high-pressure lifting water pump that lifts seawater into the dissolved gas tank of the micro nano bubble machine. During the lifting process, a certain proportion of ozone gas is introduced, and then through the release of pressure changes, large bubbles are instantly cracked to form micro nano bubbles. The uniformity of the bubbles may vary, and the formed micro nano bubbles are easier to dissolve in water due to their small particle size, with a slower rising speed and longer residence time.
The principle of continuous disinfection effect: Ozone will gradually decompose in water. In addition to producing newly generated oxygen with strong oxidizing properties for disinfection, its decomposition process will also produce some intermediate products, such as hydrogen peroxide (H202), which also have certain oxidation ability and can continuously affect microorganisms and organic pollutants in the water for a certain period of time, maintaining the disinfection effect of the water body.
2. The role of ozone water in aquaculture
① Disinfection and sterilization, prevention and control of diseases
Inactivating pathogens: Ozone can efficiently kill bacteria (such as Vibrio), viruses (such as White Spot Virus WSSV), fungi, and parasites, reducing the risk of shrimp diseases.
The CT values (concentration x time) of common pathogens need to be precisely controlled, for example:
WSSV: Ozone concentration ≥ 0.5 mg/L and contact time ≥ 2 minutes are required.
Vibrio: 0.2~0.4 mg/L can significantly inhibit it.
Reduce dependence on chemical agents: Replace some antibiotics and chlorine preparations to reduce resistance and residue issues.
② Improving water quality
Oxidation of organic matter: Decompose residual feed, feces and other organic matter, reduce COD (chemical oxygen demand) and BOD (biochemical oxygen demand) in water, and alleviate eutrophication.
Removing toxic substances:
Degradation of toxic metabolites such as ammonia nitrogen (NH3) and nitrite (NO ₂⁻) in shrimp.
Harmful gases such as hydrogen sulfide (H ₂ S) are oxidized.
Indirect effect of oxygenation: Ozone decomposition releases oxygen (2O3 → 3O ₂), increasing dissolved oxygen (DO).
③ Enhance the health of aquaculture organisms
Improve survival rate: By reducing pathogen load and improving water quality, stress and mortality rates of shrimp fry can be reduced.
Promoting growth: Clean water can enhance shrimp feeding and metabolic efficiency.
Composition of System Components
The schematic diagram of seawater filtration disinfection and detection is as follows:
Filtration System
The filtration system is mainly divided into two modules: lift pump and sand filter, carbon filter unit.
Lift pump: Flow rate Q=20m ³/h, head H=20M, material duplex stainless steel.
Sand filtration unit: Flow rate Q=20m ³/h, material: fiberglass reinforced plastic.
Quartz sand: Refined sea sand, clean and uniform particle size.
Carbon filtration unit: Flow rate Q=20m ³/h, material: fiberglass reinforced plastic.
Activated charcoal: High quality activated carbon, fruit shell charcoal
All-in-one Machine System
The all-in-one machine system is mainly divided into six modules: power supply, oxygen generator, ozone generator, micro nano bubble generator, gas-liquid mixing, analysis, and PLC control system.
- Power supply system
The system load is about 8-10KW/h and can be used under the condition of 4400V/60Hz power supply. It is matched according to the actual situation of the user. If the user’s self power supply meets the usage requirements, free power supply is used; If the user cannot meet the power supply conditions, a diesel generator will be equipped to provide power to the system.
- Oxygen concentrator
Oxygen source equipment: Oxygen production rate: 20L/M, PSA oxygen generator, oxygen purity of 93 ± 3%, can continuously produce oxygen for 24 hours, meeting the oxygen source requirements of the system.
- Ozone generator
According to the demand and concentration of ozone water, a 200g plate type ozone generator is equipped. The 200g ozone generator system consists of four main parts: system control unit, ozone unit, cooling water unit, and oxygen source unit. The composition diagram is shown in Figure 2.
The system control unit includes: PLC control system, detection instruments (including flow meters, temperature transmitters, pressure transmitters, on-site display instruments, etc.), and power distribution system;
Ozone generator unit plate type ozone generator, ozone power supply, high-frequency transformer, related instruments, etc;
The cooling water unit includes a chiller unit and related detection instruments, pipelines, etc;
The oxygen source unit adopts an oxygen generator.
Ozone generator operation mode: Independent output
Connect the micro nano bubble generator for gas-liquid mixing, and perform gas-liquid mixing from the reaction tank to the extraction water.
Purpose: Directly output from the gas source to achieve thorough disinfection and sterilization by mixing with the micro nano bubble generator.
Micro-nano bubble generator
Parameters: Processing water volume of 20m ³/h, bubble particle size of 200nm-50 μ m, power of 5.5kw
The main purpose is to break down the generated ozone gas into smaller bubbles, in order to facilitate better dissolution and fusion with water.
The generation of micro nano bubbles is achieved by a high-pressure lifting water pump that lifts seawater into the dissolved gas tank of the micro nano bubble machine. During the lifting process, a certain proportion of ozone gas is introduced, and then through the release of pressure changes, large bubbles are instantly cracked to form micro nano bubbles. The uniformity of the bubbles may vary, and the formed micro nano bubbles are easier to dissolve in water due to their small particle size, with a slower rising speed and longer residence time.
Detection System
Instrumentation
- PH detector
Measurement range: 0-14PH.
Control method: PID automatic adjustment, linked acid-base neutralization device.
Probe material: Glass electrode (resistant to seawater corrosion), standard temperature compensation sensor.
Service life: 12-18 months (regularly calibrated).
- Ammonia nitrogen detector
Measurement range: 0-1000mg/L (optional grading).
Control method: triggering sound and light alarms when exceeding the standard, and linking with the water exchange system.
Probe material: ion selective electrode (PPS shell), anti biological pollution coating.
Service life: 6-12 months (requires regular replacement of electrolyte).
- Salinity detector
Measurement range: 0-50ppt
Control mode: probe feedback.
Probe material: Titanium alloy electrode, resistant to high salt corrosion.
Service life: 2-3 years (without mechanical wear and tear).
- Turbidity detector
Measurement range: 0-1000NTU.
Control method: Activate self-cleaning filtration system when exceeding the standard.
Probe material: Sapphire optical window, 316L stainless steel shell.
Service life: 3-5 years (requires regular wiping of the optical surface).
System control mode
PLC control: Adopting Siemens S7-1500R/H series, supporting Modbus/TCP protocol, realizing multi parameter collaborative control.
Human computer interaction: Industrial touch screen (IP65 protection), supporting historical data curve display and parameter setting.
Remote monitoring: Connected to cloud platforms through 4G/5G modules, supporting real-time alerts on mobile apps.
Probe maintenance specifications
PH electrode: Soak in 3mol/L KCl solution for activation every month.
Ammonia nitrogen probe: Replace electrolyte every quarter to avoid membrane drying up.
Salinity probe: Rinse the electrode surface with distilled water every six months.
Turbidity probe: Clean the optical window with a soft cloth every week (organic solvents are prohibited).