Process control of solid particles in circulating water (Ⅲ): Control TTS through microfiltration and beam precipitator!

(1). Microfiltration machine fault monitoring     

The microfilter is the core equipment for suspended particle treatment and is a wearable device. The number of backwashing times of the microfilter is positively correlated with the concentration of suspended particles in the water. When TSS rises in the aquaculture pond, it is recommended to first check whether the microfilter is faulty.

1. The filter screen of the microfilter is damaged

     First check whether the backwash of the microfilter is normal. If the backwash does not increase with the turbidity, it is likely that the microfilter screen is damaged. If it is found, the problem can be solved by replacing the screen in time.

2. The total amount of suspended particles exceeds the microfiltration machine load

If the microfilter screen is clogged, the microfilter will continue to backwash. However, since the total amount of suspended particles exceeds the microfilter load, even backwashing will not work. At this time, the water will go over the baffle at the inlet of the microfilter and directly enter the pump pool, causing the TSS of the aquaculture pond to exceed the standard.

3. Smart microfiltration machine

Our company has launched an intelligent microfiltration machine that can monitor the number of backwashing times in real time. We have also developed a special algorithm to determine whether the filter is damaged or blocked based on turbidity data and backwashing times. This helps users detect problems in a timely manner and avoid failures in aquaculture.

(2). Accelerate the discharge frequency of vertical flow sedimentation tank to control TSS concentration

     In the recirculating aquaculture system, the vertical flow sedimentation tank is one of the key equipment for removing suspended solid particles (TSS). By speeding up the discharge frequency of the vertical flow sedimentation tank, the TSS concentration in the water body can be effectively controlled, thereby maintaining stable water quality and the health of aquaculture organisms. The following are specific methods and strategies:

1. Working principle of vertical flow sedimentation tank

     The vertical flow sedimentator uses the principle of gravity sedimentation to settle the solid suspended particles in the water to the bottom, and then discharges them through the sewage system. Its working effect mainly depends on:

Sedimentation efficiency: the sedimentation speed of the particles and the design of the sedimentator.

Discharge frequency: regularly discharge the settled sludge to prevent the particles from re-suspending.

2. The effect of accelerating the frequency of sewage discharge

     Speeding up the discharge frequency of vertical flow sedimentation tanks can:

Reduce sludge accumulation: prevent the re-suspension of settled particles and reduce the TSS concentration in the water.

Improve sedimentation efficiency: keep the sedimentation tank clean and improve the sedimentation effect of particles.

Reduce filtration load: reduce the load of subsequent filtration equipment and extend the service life of the equipment.

3. Specific measures to speed up the frequency of sewage discharge

    1) Set a reasonable sewage discharge cycle

Adjust according to TSS concentration:

When TSS concentration is high, shorten the sewage discharge cycle (such as sewage discharge once every 2 hours).

When TSS concentration is low, extend the sewage discharge cycle (such as sewage discharge once every 4 hours).

Adjust according to breeding density and feeding amount:

High breeding density and high feeding amount will increase the generation of suspended particles, and the sewage discharge frequency needs to be accelerated.

2) Automated sewage discharge system

Install automatic sewage discharge valve: According to the preset sewage discharge cycle, the sewage discharge valve is automatically opened and closed to achieve timed sewage discharge.

Combined with TSS sensor: According to the real-time monitoring data of TSS concentration, the sewage discharge frequency is automatically adjusted.

3) Optimize sewage discharge operation

Sewage discharge time: Each sewage discharge time should not be too long to avoid a large amount of water loss.

Sewage discharge volume: According to the amount of sludge in the sedimentation tank, control the amount of sewage discharged each time to ensure effective sludge discharge.

4. The effect of accelerating the frequency of sewage discharge

     Reduce TSS concentration: By speeding up the frequency of sewage discharge, the TSS concentration in the water body can be effectively reduced and the water quality can be improved.

Improve system stability: Reduce the accumulation of suspended particles, reduce water quality fluctuations, and improve the stability of system operation.

Extend equipment life: Reduce the load of filtration equipment, extend equipment life, and reduce maintenance costs.

5. Notes

     Balance between sewage discharge frequency and energy consumption: Accelerating sewage discharge frequency will increase energy consumption, and the sewage discharge cycle needs to be optimized according to actual conditions.

Sewage discharge control: Avoid excessive sewage discharge that causes water loss and unstable breeding environment.

6. Summary

     By speeding up the discharge frequency of the vertical flow sedimentation tank, the TSS concentration in the recirculating aquaculture system can be effectively controlled, the water quality can be improved, and the system stability and aquaculture efficiency can be increased. Combining the automated sewage discharge system with real-time TSS monitoring, the sewage discharge strategy can be further optimized to achieve efficient and energy-saving water quality management. However, increasing the sewage discharge frequency may increase water and energy consumption. Therefore, the feeding strategy should be adjusted first and then the sewage discharge strategy should be considered.