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Characteristics of Recirculating Aquaculture Wastewater

High concentration of organic matter:

A large amount of organic waste will be produced in aquaculture water bodies, such as feed residues, excrement, etc. This organic matter accumulates in the water, resulting in a high concentration of organic matter in the wastewater.

High ammonia nitrogen and nitrate nitrogen content:

During the breeding process, the excreta of fish and other cultured organisms contain ammonia nitrogen, and the ammonia nitrogen in the culture water body needs to be effectively treated to prevent harmful effects on the cultured organisms.

Suspended solid matter:

Wastewater may contain a large amount of suspended solids, such as feed residues, algae, microorganisms, etc. These substances have a certain impact on water quality.

Microbial community:

There are a large number of microorganisms in the circulating culture system, including beneficial biodegrading bacteria and other microorganisms. These microorganisms play an important role in water quality stability and wastewater treatment.

Water quality management is challenging:

The presence of multiple pollutants in wastewater makes it difficult to maintain water quality within acceptable limits.

High wastewater treatment costs:

Treating aquaculture wastewater, which contains complex pollutants, requires significant investment, especially for the efficient removal of nitrogen and phosphorus.

Drug and pathogen residue issues:

The use of antibiotics and other medications in aquaculture can leave residues that impact water quality and the environment, making effective treatment difficult.

Water resource waste and inefficient recycling:

Although recirculating aquaculture systems are designed to save water, improper wastewater treatment can lead to inefficient water reuse and low recycling efficiency.

Based on the characteristics of Recirculating aquaculture wastewater

MBBR Must Have the Following Properties

1

High attachment surface area

MBBR uses biological attachment carriers, such as plastic particles or sheet media, to provide a large amount of surface area to promote the attachment and growth of microorganisms. This helps increase the biodegradation efficiency of organic matter in wastewater.

2

Strong biodegradation ability

The MBBR system should have efficient biodegradation ability and be able to effectively decompose organic matter in aquaculture wastewater, including feed residues and biological excreta.

3

Ammonia nitrogen removal efficiency

High concentrations of ammonia nitrogen are often present in circulating aquaculture wastewater. MBBR needs to have good ammonia nitrogen removal efficiency to ensure that the ammonia nitrogen concentration in the wastewater is maintained at a safe level.

4

Adaptability and stability

The MBBR system needs to have good adaptability to load fluctuations to cope with possible water quality fluctuations and load changes in the breeding system.

5

Easy maintenance and cleaning

The structure of MBBR equipment should be designed to be easy to clean and maintain to ensure long-term stable operation of the system and reduce downtime.

6

Uniform water circulation

MBBR needs to have effective water circulation to ensure that the biological attachment carriers are evenly distributed throughout the system to make full use of the attachment area.

7

Anti-pollution performance

MBBR should have certain anti-pollution performance to deal with suspended solids, sediments, etc. that may exist in aquaculture wastewater and maintain the stability of the system.

8

Adapt to different water quality conditions

The MBBR system should have the ability to adapt to different water quality conditions, because the water quality of circulating breeding wastewater may change due to seasons, breeding activities, etc.

Features

MBBR and Disc Diffuser Must have Performance

In the recirculating aquaculture process, MBBR and aeration disks are usually key components of the biological treatment system. Through processes such as biodegradation and oxygen transfer, they help maintain good water quality, provide suitable environmental conditions, and promote the growth and health of cultured organisms.

MBBR (Moving Bed Biofilm Reactor)

Bioattachment Carrier: MBBR uses a bioattachment carrier, typically plastic pellets or sheet media, that provides a large surface area to promote microbial attachment and growth.
High biodegradation efficiency: MBBR can provide a large amount of biological attachment area to accommodate a large number of microbial communities, thereby achieving efficient organic matter degradation and ammonia nitrogen removal.
Operational stability: MBBR equipment should have stable operating performance and good adaptability to load fluctuations to ensure the stability of water quality treatment.

Disc diffusers

Oxygen transfer efficiency: The aeration disk needs to have high oxygen transfer efficiency to meet the aerobic needs of microorganisms in the water body and promote biodegradation reactions.
Uniform Aeration: The aeration tray should be able to provide uniform bubble distribution to ensure uniform distribution of dissolved oxygen throughout the water body and avoid dead zones.
Corrosion resistance: The aeration disk usually comes into contact with some chemicals in the water, so it needs to be corrosion-resistant to maintain its long-term stable working performance.
Easy to clean and maintain: The aeration disk needs to be designed to be easy to clean and maintain to ensure long-term stable operation and reduce downtime.

Recirculating aquaculture wastewater treatment

Precautions, Water Process and Parameter Table

Precautions for recycling aquaculture wastewater treatment

Water quality monitoring: Regularly monitor water quality parameters, including ammonia nitrogen, nitrite, nitrate, suspended solids, dissolved oxygen, etc. Through monitoring, problems can be discovered in time and corresponding measures can be taken. It is recommended to choose the Aquasust 6-in-1 water quality monitor.
Adaptive treatment: Adaptive treatment should be carried out to factors such as seasonality and climate change. Changes in water temperature, air temperature, etc. may affect the wastewater treatment effect, so the operating parameters of the wastewater treatment system need to be adjusted accordingly.
Load management: Ensure that water loads in a recirculating culture system are properly managed. Avoid excessive feeding of feed and high breeding density to prevent overloading of water bodies and deterioration of water quality.
Control the amount of aeration: Reasonably control the amount of aeration to maintain the level of dissolved oxygen in the water body. Too much or too little aeration can hurt the effectiveness of wastewater treatment.
Regular cleaning and maintenance: Regular cleaning and maintenance of equipment in the circulating culture system, including biological filters (such as MBBR), aeration systems, sedimentation tanks, etc. Cleaning prevents equipment clogging and improves processing efficiency.
Use appropriate treatment technology: Select appropriate treatment technology based on water quality characteristics. Different water quality may require different treatment methods, such as biological treatment, physical treatment, or chemical treatment.

Features of recycling breeding wastewater process The recirculating aquaculture wastewater treatment process has some unique characteristics, which are mainly related to the operation mode of the recirculating aquaculture system, water circulation, water quality management, and wastewater treatment technology. The following are some characteristics of the recycling aquaculture wastewater treatment process:

Water circulation:The recycling aquaculture wastewater treatment process focuses on the recycling of water bodies. After the wastewater is treated, part of it can be put back into the breeding system to reduce the use of fresh water and improve the efficiency of water resource utilization.
Flexibility:The circulating aquaculture wastewater treatment process has a certain degree of flexibility and can adapt to changes in different aquaculture systems and water quality conditions. This flexibility makes it easier to cope with water quality fluctuations caused by factors such as different seasons, breeding densities and other factors.
Biodegradation:Circulating aquaculture wastewater treatment processes usually use biodegradation technology, such as biological filters (such as MBBR) to treat organic waste. Through the attachment and growth of microorganisms, organic matter is effectively decomposed.
Multi-stage treatment:Circulating aquaculture wastewater treatment processes usually use multi-stage treatment, including physical treatment, biological treatment and chemical treatment at different stages to ensure that the wastewater can be treated comprehensively and effectively.
Ammonia nitrogen removal: High concentrations of ammonia nitrogen are often present in circulating culture systems. The wastewater treatment process needs to have good ammonia nitrogen removal capabilities to ensure that the ammonia nitrogen concentration in the water body is maintained at a safe level.
Energy saving and environmental protection: The recycling breeding wastewater treatment process focuses on energy saving and environmental protection. By optimizing process design, reducing energy consumption, and reducing wastewater discharge, a more sustainable breeding system operation can be achieved.
Water quality monitoring and regulation: Regularly monitor water quality parameters, including ammonia nitrogen, dissolved oxygen, suspended solids, etc., and regulate based on monitoring results to keep key parameters in the water body within appropriate ranges.
Technological innovation: The recycling aquaculture wastewater treatment process usually relies on technological innovation and uses advanced water treatment technology and equipment to improve wastewater treatment efficiency and water quality stability.
Wastewater reuse: The recycling aquaculture wastewater treatment process encourages the reuse of wastewater. Properly treated wastewater can be used to replenish the water body in the breeding system, reducing the breeding system's dependence on external water sources.
Social recognition: The recycling aquaculture wastewater treatment process is in line with the concept of sustainable development, so it is easier to gain social recognition and support, especially as environmental awareness is increasing.

Circulating breeding wastewater treatment process

Solid-liquid separation: Wastewater first enters a solid-liquid separation device such as Aquasust's drum filter. At this stage, suspended solid particles settle to the bottom to form sludge, while the clearer water enters the next stage of treatment.
Physical Treatment: In some cases, wastewater may require physical treatment, such as filtration or adsorption, to remove residual suspended particles or other impurities.
Biological treatment (MBBR): Entering the biological treatment stage, the wastewater passes through a biological filter, such as MBBR (Moving Bed Biofilm Reactor). In MBBR, organic matter is attached to the biological attachment carrier by microorganisms, and the organic waste is processed through the degradation of microorganisms.
Disinfection: After the wastewater has been treated as above, it may need to be disinfected to kill residual microorganisms and ensure the hygiene and safety of the discharged water. Disinfection typically uses methods such as chlorine, ultraviolet light, or ozone.
Ammonia nitrogen removal: For ammonia nitrogen in wastewater, additional biological treatment units, such as nitrification reactors, may be used to convert ammonia nitrogen into nitrite and nitrate, and ultimately remove ammonia nitrogen.
Wastewater reuse: Treated water can be reused, for example, back into a recirculating culture system. This helps reduce freshwater use and improve water use efficiency.
Aeration system: Wastewater may enter an aeration tank or aeration system, which injects bubbles into the water body to provide oxygen to promote the growth of microorganisms and the process of degrading organic matter. Aeration also helps maintain dissolved oxygen levels in water bodies.
Water quality monitoring: During the entire treatment process, regular water quality monitoring is required to ensure that various indicators are within a safe range. Monitoring results can be used to adjust treatment process parameters.

Recirculating aquaculture wastewater treatment

Typical Parameter

The following is a parameter table of a typical Recirculating aquaculture wastewater treatment process. The specific values can be adjusted according to the actual situation:

Satge	Processing unit	Typical parameters	Unit
Solid-liquid separation	Sedimentation tank	TSS	50 - 500 mg/L
Biological treatment	MBBR	COD	30 - 200 mg/L
		NH3-N	2 - 10 mg/L
		NO2-N	< 1 mg/L
		NO3-N	< 10 mg/L
		TN	5 - 30 mg/L
Aeration system	Aeration tank	DO	3 - 8 mg/L
Physical treatment	Filter	TSS	10 - 50 mg/L
Ammonia nitrogen removal	Ammonia nitrogen removal unit	NH3-N	< 1 mg/L
Sterilize	Sterilization equipment	Sterilant concentration	0.5 - 5 mg/L
Water quality monitoring	Monitoring equipment	PH	6.5 - 8.5
		Conductivity	500 - 2000 μS/cm
		Temperature	20 - 30 ℃

For Recirculating aquaculture wastewater treatment

A Unique MBBR Model is Recommended

Based on the characteristics of sewage treatment and the experience of previous cooperative customers, the recommendation is our MBBR64 or MBBR7

MBBR78

Size: Φ25*4mm

Hole Numbers: 78

Material: 100% White Virgin HDPE

Densilty: 0.96-0.98g/cm³

Surface Area: >1600m²/m³

Dosing Ratio: 15-65%

Membrane-Forming Time: 3-15days

Nitrification Efficiency: 400-1200gNH₄ N/M³.d

BOD₅, Efficiency: 2000-10000g BOD₅/M³.d

COD₅ Efficiency: 2000-15000g COD₅/M³.d

Applicable Temperature: 5-60℃

Life-Span: >20year

MBBR64

Size: Φ25*4mm

Hole Numbers: 64

Material: 100% White Virgin HDPE

Densilty: 0.96-0.98g/cm³

Surface Area: >1200m^2/m³

Dosing Ratio: 15-65%

Membrane-Forming Time: 3-15days

Nitrification Efficiency: 400-1200g NH₄ N/M³.d

BOD₅, Efficiency: 2000-10000g BOD₅/M³.d

COD₅Efficiency: 2000-15000g COD₅/M³.d

Applicable Temperature: 5-60℃

Life-Span: >20year

Recirculating aquaculture wastewater treatment

AquaSust Latest Case

Tilapia farming case in UAE

The project land is 400000m2, the investment is 61.54 million US dollars, and the estimated output value is 92.3 million US dollars. Aquasust designed the project and delivered protein skimmers, drum filters, ozone and aerobic generators, MBBR, aeration disks, automation equipment, online Monitoring control systems, and other equipment.

Tilapia farming case in UAE

The project land is 400000m2, the investment is 61.54 million US dollars, and the estimated output value is 92.3 million US dollars. Aquasust designed the project and delivered protein skimmers, drum filters, ozone and aerobic generators, MBBR, aeration disks, automation equipment, online Monitoring control systems, and other equipment.

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With 20 years of wastewater treatment experience, AquaSust is the trusted expert in biochemical pool solutions. If you have any questions about wastewater treatment, please contact us and we will provide you with the best solution.

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